Order Code RL32929
Nuclear Weapons: The Reliable
Replacement Warhead Program
Updated February 8, 2007
Jonathan Medalia
Specialist in National Defense
Foreign Affairs, Defense, and Trade Division

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Nuclear Weapons: The Reliable
Replacement Warhead Program
Summary
Most current U.S. nuclear warheads were built in the 1970s and 1980s and are
being retained longer than was planned. Yet they deteriorate and must be maintained.
To correct problems, a Life Extension Program (LEP) replaces components.
Modifying some components would require a nuclear test, but a test moratorium is
in effect. Therefore, LEP rebuilds these components as closely as possible to original
specifications. Using this approach, the Secretaries of Defense and Energy have
certified stockpile safety and reliability for the past 11 years without nuclear testing.
In the FY2005 Consolidated Appropriations Act, Congress provided $9 million
to initiate the Reliable Replacement Warhead (RRW) program. The program will
study trading off key Cold War features such as high yield and low weight to gain
features more valuable now, such as lower cost, greater ease of manufacture, and a
further increase in use control. It plans to make these improvements by designing
replacement warheads that would not add military capability. The National Nuclear
Security Administration (NNSA), which operates the U.S. nuclear weapons program,
views RRW as part of a comprehensive plan that would also modernize the nuclear
weapons complex (the Complex), avoid nuclear testing, and reduce non-deployed
weapons. The Nuclear Weapons Council, a joint NNSA-Department of Defense
organization that coordinates nuclear weapons matters, is conducting a competition
for an RRW design; the winning design is likely to be selected in December 2006.
The FY2006 appropriation was $25.0 million; the FY2007 request is $27.7 million;
and the FY2008 request is $88.8 million for NNSA and $30.0 million for the Navy.
NNSA argues that it will be increasingly difficult to certify current warheads
using LEP because small changes will weaken the link to past nuclear tests, perhaps
requiring nuclear testing, while RRW will lead to new-design replacement warheads
that will be easier to manufacture and certify without nuclear testing. Critics believe
LEP and related programs can maintain the stockpile indefinitely. They worry that
RRWs, not having a nuclear test pedigree, may make a return to testing more likely.
They question cost savings; even if RRW could lower operations and maintenance
cost, its investment cost would be high. They note that there are no military
requirements for new weapons. Still others feel that neither LEP nor RRW can
provide high confidence over the long term, and would resume nuclear testing.
Congress and the Administration, however, both prefer to avoid a return to testing.
At issue for the 110th Congress is how best to maintain the nuclear stockpile
indefinitely, whether to cancel RRW in favor of LEP or to continue RRW, and how
to proceed in the latter case.
This report provides background and tracks legislation. It will be updated
frequently. CRS Report RL33748, Nuclear Warheads: The Reliable Replacement
Warhead Program and the Life Extension Program, by Jonathan Medalia, provides
detailed analysis of these two programs and arguments for and against each.

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Contents
Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Issue Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
The Need to Maintain Nuclear Warheads for the Long Term . . . . . . . . . . . . 3
The Solution So Far: The Life Extension Program . . . . . . . . . . . . . . . . . . . . 6
Is LEP Satisfactory for the Long Term? . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
RRW and the Transformation of Nuclear Warheads . . . . . . . . . . . . . . . . . . . 9
Efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Yield . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Performance, Schedule, and Cost Tradeoffs . . . . . . . . . . . . . . . . . . . . 11
Environment, Safety, and Health (ES&H) . . . . . . . . . . . . . . . . . . . . . . 11
Skill Development and Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
RRW Program Developments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Congressional Action on the FY2006 RRW Request . . . . . . . . . . . . . . . . . . . . . 17
Congressional Action on the FY2007 RRW Request . . . . . . . . . . . . . . . . . . . . . 23
Congressional Action on the FY2008 RRW Request . . . . . . . . . . . . . . . . . . . . . 26
Policy Options for the 110th Congress . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Chronology, 2007- . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Appendix. Nuclear Weapons, Nuclear Weapons Complex, and
Stockpile Stewardship Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

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Nuclear Weapons: The Reliable
Replacement Warhead Program
Background
Issue Definition
Nuclear warheads must be maintained so the United States and its friends, allies,
and adversaries will be confident about the safety and effectiveness of U.S. nuclear
forces. Yet warheads deteriorate with age. The current Life Extension Program
(LEP) maintains them by replacing deteriorated components. The National Nuclear
Security Administration (NNSA), the Department of Energy (DOE) agency in charge
of the nuclear weapons program, however, expresses concerns that LEP might be
unable to maintain warheads for the long term on grounds that the accumulation of
minor but inevitable variations between certain original and replacement components
may reduce confidence that life-extended warheads remain safe and effective. It
recommends a new approach, the Reliable Replacement Warhead (RRW), described
below. On the other hand, a study released in November 2006 estimates that pits, a
key warhead component (see Appendix), should have a service life of 85 to 100
years or more,1 arguably making it unnecessary to rebuild them and extending the
time over which confidence should remain high.
Reflecting NNSA’s concern, Congress first funded the Reliable Replacement
Warhead (RRW) program in the FY2005 Consolidated Appropriations Act, P.L. 108-
447. The entire description of RRW in the conference report was a “program to
improve the reliability, longevity, and certifiability of existing weapons and their
components.”2 Committee reports earlier in FY2005 had not mentioned RRW.
Congress authorized the program in the FY2006 National Defense Authorization Act,
P.L. 109-163, Section 3111. At issue for Congress is how best to maintain the nuclear
stockpile and its supporting infrastructure for the long term. Through a decision on
this issue, Congress may affect the capabilities of U.S. nuclear forces and of the
nuclear weapons complex (“the Complex”).
Congress has spelled out dozens of goals for the program. A key goal is to
increase confidence, without nuclear testing, that warheads will perform as intended
1 R.J. Hemley et al., Pit Lifetime, JSR-06-335, MITRE Corp., November 20, 2006, available
at [http://www.nukewatch.org/facts/nwd/JASON_ReportPuAging.pdf].
2 U.S. Congress, Committee of Conference, Making Appropriations for Foreign Operations,
Export Financing, and Related Programs for the Fiscal Year Ending September 30, 2005,
and For Other Purposes, report to accompany H.R. 4818, 108th Congress, 2nd Session, 2004,
H.Rept. 108-792, reprinted in U.S. Congress, Congressional Record, Nov. 19, 2004, Book
II, p. H10556.

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CRS-2
over the long term. Other goals are to increase ease of manufacture and certification,
reduce life cycle cost, increase weapon safety and use control, and reduce
environmental burden. CRS Report RL33748, Nuclear Warheads: The Reliable
Replacement Warhead Program and the Life Extension Program, by Jonathan
Medalia, details 20 such goals. To achieve them, RRW would trade characteristics
important during the Cold War for those of current importance, as described below.
The Department of Defense (DOD) has approved this tradeoff. It would be
impossible to meet all the goals simultaneously through slight modifications of
existing warheads, in part because their designs are so “tight” that NNSA is
concerned that even minor changes might reduce confidence in the reliability of these
warheads over the long term. As such, the RRW program would design new
warheads to replace existing ones. In contrast, LEP makes changes chiefly to
maintain weapons, and in particular minimizes changes to the nuclear explosive
package (see Appendix).
RRW is sharply debated. Supporters anticipate that RRW will permit replacing
a large stockpile of nondeployed nuclear warheads with fewer warheads in which
DOD can have greater confidence over the long term, and restructuring the Complex
to be smaller, safer, more efficient, and less costly. A Defense Science Board task
force finds that LEP “is clearly not a sustainable approach” and recommended
proceeding with RRW.3 NNSA argued that RRWs “will be re-designed for long-
term confidence in reliability and greater security, and ease of production and
maintenance.4 Critics question whether some of the tradeoffs and goals are feasible,
necessary, or worth potential costs and risks. For example, one commenter argued,
“The plutonium research results [see footnote 1] obliterate the chief rationale for
NNSA’s emerging strategy” of RRW,5 while the New York Times opined that RRW
“is a public-relations disaster in the making overseas” and “a make-work program
championed by the weapons laboratories and belatedly by the Pentagon.”6
This report (1) describes the LEP and difficulties ascribed to it by its critics; (2)
shows how post-Cold War changes in constraints may open opportunities to improve
long-term warhead maintenance and reach other goals; (3) describes RRW and its
pros and cons; and (4) presents issues for Congress. The report tracks action on the
FY2006 and subsequent requests, and describes implementation of RRW. An
Appendix describes nuclear weapon design and operation, the weapons science and
technology program underlying efforts to maintain weapons, and the Complex.
3 U.S. Department of Defense. Defense Science Board. Report of the Defense Science
Board Task Force on Nuclear Capabilities: Report Summary, December 2006, p. 39, 41.
4 U.S. Department of Energy. National Nuclear Security Administration. Office of Defense
Programs. Complex 2030: An Infrastructure Planning Scenario for a Nuclear Weapons
Complex Able to Meet the Threats of the 21st Century, DOE/NA-0013, October 2006, p. 1.
5 Daryl Kimball, “New Reasons to Reject New Warheads,” Arms Control Today,
January/February 2007.
6 “Busywork for Nuclear Scientists,” New York Times, January 15, 2007, p. 18.

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The Need to Maintain Nuclear Warheads for the Long Term
Nuclear warheads must be maintained because they contain thousands of parts
that deteriorate at different rates. Some parts and materials have well-known limits
on service life,7 while the service life of other parts may be unknown or revealed only
by multiple inspections of a warhead type over time. A 1983 report argued that
maintenance requires nuclear testing:
Certain chemically reactive materials are inherently required in nuclear weapons,
such as uranium or plutonium, high explosives, and plastics. The fissile
materials, both plutonium and uranium, are subject to corrosion. Plastic-bonded
high explosives and other plastics tend to decompose over extended periods of
time. ... portions of materials can dissociate into simpler substances. Vapors
given off by one material can migrate to another region of the weapon and react
chemically there. ... Materials in the warhead electrical systems ... can produce
effluents that can migrate to regions in the nuclear explosive portion of the
weapon. ... The characteristics of high explosives can change with time. ... Vital
electrical components can change in character ...8
A 1987 report, written to rebut the contention of the foregoing report that
nuclear testing is needed to maintain warheads, agreed that aging affects components:
It should also be noted that nuclear weapons engineering has benefitted
from a quarter century of experience in dealing with corrosion, deterioration, and
creep since the time that the W45, W47, and W52 [warheads] entered the
stockpile in the early sixties (just after the test moratorium of 1958-1961). ...
Most of the reliability problems in the past have resulted from either an
incomplete testing program during the development phase of a weapon or the
aging and deterioration of weapon components during deployment.9
Some feel that deterioration, while a potential problem, has been overstated. A
scientific panel writing in 1999 stated,
there is no such thing as a “design life.” The designers were not asked or
permitted to design a nuclear weapon that would go bad after 20 years. They did
their best on a combination of performance and endurance, and after experience
with the weapon in storage there is certainly no reason to expect all of the
nuclear weapons of a given type to become unusable after 20 or 25 years. In fact,
one of the main goals of SBSS [Science-Based Stockpile Stewardship, an earlier
7 U.S. General Accounting Office, Nuclear Weapons: Capabilities of DOE’s Limited Life
Component Program to Meet Operational Needs, GAO/RCED-97-52, Mar. 5, 1997,
available at [http://www.globalsecurity.org/wmd/library/report/gao/rced97052.htm].
8 “Some Little-Publicized Difficulties with a Nuclear Freeze,” Prepared by Dr. J.W.
Rosengren, R&D Associates, under Contract to the Office of International Security Affairs,
U.S. Department of Energy, October 1983, p. 5-6; reprinted in U.S. Congress. Senate.
Committee on Foreign Relations. Nuclear Testing Issues. 99th Congress, 2nd Session, Senate
Hearing 99-937, 1986, pp. 167-168.
9 Ray Kidder, Stockpile Reliability and Nuclear Test Bans: Response to J.W. Rosengren’s
Defense of His 1983 Report, Lawrence Livermore National Laboratory, UCID-20990, Feb.
1987, pp. 4-5.

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CRS-4
term for the Stockpile Stewardship Program, discussed below] is to predict the
life of the components so that remanufacture may be scheduled, and results to
date indicate a margin of surety extending for decades. ... Until now, clear
evidence of warhead deterioration has not been seen in the enduring stockpile,
but the plans for remanufacture still assume that deterioration is inevitable on the
timescale of the old, arbitrarily defined “design lives.”10
The deterioration noted above pertained to warheads designed in the 1950s and
early 1960s that are no longer deployed. Newer warheads correct some of these
problems. As knowledge of warhead performance, materials, and deterioration
increases, the labs are able to correct some problems and forestall others. Still other
aging problems have turned out to occur at a slower pace than was feared. In
particular, it was long recognized that plutonium would deteriorate as it aged, but it
was not known how long it would take for its deterioration to impair the performance
of the pit, the fissile core of a nuclear weapon’s primary stage (see Appendix).
NNSA had estimated that that would take at least 45 to 60 years, but a November
2006 study found
there is no degradation in performance of primaries of stockpile systems [i.e.,
warheads] due to plutonium aging that would be cause for near-term concern
regarding their safety and reliability. Most primary types have credible minimum
lifetimes in excess of 100 years as regards aging of plutonium; those with
assessed minimum lifetimes of 100 years or less have clear mitigation paths that
are proposed and/or being implemented.11
During the Cold War, any deterioration problems were limited in their duration
because the United States introduced generation after generation of long-range
nuclear-armed bombers and ballistic missiles, each of which would typically carry
a new warhead tailored to its characteristics and mission. New warheads were
usually introduced long before the warheads they replaced reached the end of their
service lives. Three trends concerning deterioration have emerged since the end of
the Cold War: (1) Stockpile Stewardship and other tools, described below, have
greatly increased NNSA’s understanding of warhead deterioration and how to deal
with or prevent it. (2) By maintaining the current set of warhead designs for many
years, design and production errors have been subjected to systematic identification
and elimination. (3) Nuclear warheads have much more time to age, as warheads that
were expected to remain in the stockpile for at most 20 years are now being retained
indefinitely. The net of these trends is that understanding of deterioration, while
improving, is not perfect, so deterioration remains a concern.
Current warheads were designed to meet an exacting set of constraints, such as
safety parameters, yield, and conditions (such as temperature) that they would
encounter in their lifetimes. Design compromises were made to meet these
constraints. Ambassador Linton Brooks, NNSA Administrator, said that to meet
10 Sidney Drell, Raymond Jeanloz, et al., Remanufacture, MITRE Corporation, JASON
Program Office, JSR-99-300, Oct. 1999, pp. 4, 8.
11 R.J. Hemley et al., Pit Lifetime, JSR-06-335, MITRE Corp., November 20, 2006, p. 1,
available at [http://www.nukewatch.org/facts/nwd/JASON_ReportPuAging.pdf].

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requirements, “we designed these systems very close to performance cliffs.”12 That
is, designs approached points at which warheads would fail.13 Many parts were hard
to produce or used hazardous materials. Warheads were often hard to assemble. This
approach increased the difficulty of replicating some components and of maintaining
warheads. Ambassador Brooks said, “it is becoming more difficult and costly to
certify warhead remanufacture. The evolution away from tested designs resulting
from the inevitable accumulations of small changes over the extended lifetimes of
these systems means that we can count on increasing uncertainty in the long-term
certification of warheads in the stockpile.”14
At issue is whether warheads can be maintained despite the absence of nuclear
testing by replacing deteriorated components with newly-made ones built as close as
possible to the original specifications. This debate has been going on for decades.
In a 1978 letter to President Carter, three weapons scientists argued that the United
States could go to great lengths in remanufacturing weapon components:
it is sometimes claimed that remanufacture may become impossible because of
increasingly severe restrictions by EPA or OSHA to protect the environment of
the worker. ... if the worker’s environment acceptable until now for the use of
asbestos, spray adhesives, or beryllium should be forbidden by OSHA
regulations, those few workers needed to continue operations with such material
could wear plastic-film suits ... It would be wise also to stockpile in appropriate
storage facilities certain commercial materials used in weapons manufacture
which might in the future disappear from the commercial scene.15
However, in a 1987 report, three scientists at Lawrence Livermore National
Laboratory stated:
! Exact replication, especially of older systems, is impossible.
Material batches are never quite the same, some materials become
unavailable, and equivalent materials are never exactly equivalent.
“Improved” parts often have new, unexpected failure modes.
Vendors go out of business ...
! Documentation has never been sufficiently exact to ensure
replication. ... We have never known enough about every detail to
specify everything that may be important. ...
12 U.S. Congress, Senate Committee on Armed Services, Subcommittee on Strategic Forces,
Strategic Forces/Nuclear Weapons Fiscal Year 2006 Budget, hearing, Apr. 4, 2005.
13 For example, if designers calculated that a certain amount of plutonium was the minimum
at which the warhead would work, they might add only a small extra amount as a margin of
assurance.
14 Brooks statement to Senate Armed Services Committee, Apr. 4, 2005, p. 3.
15 Letter from Norris Bradbury, J. Carson Mark, and Richard Garwin to President Jimmy
Carter, Aug. 15, 1978, reprinted in U.S. Congress, House Committee on Foreign Affairs and
Its Subcommittee on Arms Control, International Security and Science, Proposals to Ban
Nuclear Testing, H.J.Res. 3, 99th Congress, 1st Sess., hearings, (Washington: GPO, 1985),
p. 215.

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CRS-6
! The most important aspect of any product certification is testing; it
provides the data for valid certification.16
The Solution So Far: The Life Extension Program
With the end of the Cold War, the Complex, like the rest of the defense
establishment, faced turmoil. Budgets and personnel were reduced, design of new
weapons ended, and a test moratorium began. For a time, the chief concern of
DOE’s nuclear weapons management was survival of the Complex.
To address this concern and set a course for the nuclear weapons enterprise,
Congress, in the FY1994 National Defense Authorization Act (P.L. 103-160),
Section 3138, directed the Secretary of Energy to “establish a stewardship program
to ensure the preservation of the core intellectual and technical competencies of the
United States in nuclear weapons, including weapons design, system integration,
manufacturing, security, use control, reliability assessment, and certification.” Since
then, the Clinton and Bush Administrations have requested, and Congress has
approved, tens of billions of dollars for this Stockpile Stewardship Program (SSP),
which is presented in NNSA’s budget as “Weapons Activities.”17
SSP uses data from past nuclear tests, small-scale laboratory experiments, large-
scale experimental facilities, examination of warheads, and the like to improve
theoretical understanding of the science underlying nuclear weapons performance.
In turn, it uses this knowledge to improve computer codes that simulate aspects of
weapons performance, revealing aspects of this performance and filling gaps in the
nuclear weapons laboratories’ understanding of it. Such advances enable scientists
to analyze data from past nuclear tests more thoroughly, mining it to extract still
more information. Theory, simulation, and data reinforce each other: theory refines
simulation, simulation helps check theory, theory and simulation guide researchers
to look for certain types of data, and data help check simulation and theory.
A key task of the Complex is to monitor warheads for signs of actual or future
deterioration. This work is done through a program that conducts routine
surveillance of warheads in the stockpile by closely examining 11 warheads of each
type per year to search for corrosion, gases, and other evidence of deterioration. Of
the 11, one is taken apart for destructive evaluation, while the other 10 are evaluated
nondestructively and returned to the stockpile.18 In addition, an Enhanced
Surveillance Program supports surveillance; its goal “is to develop diagnostic tools
16 George Miller, Paul Brown, and Carol Alonso, Report to Congress on Stockpile
Reliability, Weapon Remanufacture, and the Role of Nuclear Testing, Lawrence Livermore
National Laboratory, UCRL-53822, Oct. 1987, p. 25. For an opposing view, see R.E.
Kidder, Maintaining the U.S. Stockpile of Nuclear Weapons During a Low-Threshold or
Comprehensive Test Ban, Lawrence Livermore National Laboratory, UCRL-53820, Oct.
1987, esp. pp. 6-9.
17 See CRS Report RL32852, Energy and Water Development: FY2006 Appropriations,
coordinated by Carl Behrens, section on Nuclear Weapons Stockpile Stewardship.
18 Information provided by NNSA, May 9, 2005.

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and predictive models that will make it possible to analyze and predict the effects that
aging may have on weapon materials, components, and systems.”19
When routine surveillance detects warhead problems, the Complex applies
knowledge gained through SSP to fix problems through the Life Extension Program
(LEP), which attempts “to extend the stockpile lifetime of a warhead or warhead
components at least 20 years with a goal of 30 years”20 beyond the originally-
anticipated deployment time.
A warhead’s components may be divided into two categories: those that are part
of the nuclear explosive package (NEP), and those that are not. As described in the
Appendix, the NEP is the part of the warhead that explodes, as distinct from the
more numerous components like the outer case or arming system. Because non-NEP
components can be subjected to extensive experiments and nonnuclear laboratory
tests, they can be modified as needed under LEP to incorporate more advanced
electronics or safer materials. In contrast, NEP components cannot be subjected to
nuclear tests because the United States has observed a moratorium on nuclear testing
since 1992. As a result, LEP seeks to replicate these components using original
designs and, insofar as possible, original materials. In this way, it is hoped,
components will be close to the originals so that they can be qualified for use in
warheads. Because NEP components cannot be tested while other components can
be, long-term concern focuses on the former.
Warheads contain several thousand components. While not all need to be
refurbished in an LEP, some are difficult to fabricate, and assembly may be difficult,
as discussed earlier. As a result, the LEP for an individual warhead type is a major
campaign requiring extensive preparatory analysis and detailed work on many
components that can take many years. For example, NNSA describes the LEP for the
W76 warhead for Trident submarine-launched ballistic missiles as follows:
The W76 LEP will extend the life of the W76 for an additional 30 years with the
FPU [first production unit] in FY 2007. Activities include design, qualification,
certification, production plant Process Prove-In (PPI), and Pilot Production. The
pre-production activities will ensure the design of refurbished warheads meets
all required military characteristics. Additional activities include work associated
with the manufacturability of the components including the nuclear explosive
package; the Arming, Firing, and Fuzing (AF&F) system; gas transfer system;
and associated cables, elastomers, valves, pads, cushions, foam supports,
telemetries, and miscellaneous parts.21
Stockpile stewardship has made great strides in understanding weapons science,
in predicting how weapons will age, and in predicting how they will fail. Most
19 Katie Walter, “Enhanced Surveillance of Aging Weapons,” Science & Technology
Review, Jan./Feb. 1998, p. 21.
20 U.S. Department of Energy. Office of Chief Financial Officer. FY2007 Congressional
Budget Request, COE/CF-002, February 2006, vol. I, p. 79. Also, see ibid., pp. 79-80, for
a weapon-by-weapon description of LEP activities planned for FY2007.
21 Department of Energy, FY2007 Congressional Budget Request, vol. 1, p. 79.

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observers agree with the following assessment by Ambassador Brooks in
congressional testimony of April 2005:
today stockpile stewardship is working, we are confident that the stockpile is safe
and reliable, and there is no requirement at this time for nuclear tests. Indeed, just
last month, the Secretary of Energy and Secretary of Defense reaffirmed this
judgment in reporting to the President their ninth annual assessment of the safety
and reliability of the U.S. nuclear weapons stockpile. ... Our assessment derives
from ten years of experience with science-based stockpile stewardship, from
extensive surveillance, from the use of both experiments and computation, and
from professional judgment.22 [original emphasis]
Is LEP Satisfactory for the Long Term?
In the turmoil following the end of the Cold War, it is scarcely surprising that
the method chosen to maintain the stockpile — a task that had to be performed in the
face of the many changes affecting the Complex and the many unknowns about its
future — was to minimize changes. Now, with SSP well established, NNSA feels
that it is appropriate to use a different approach to warhead maintenance, one that
builds on the success of SSP and challenges the notion underlying LEP that changes
must be held to a minimum.
Advocates of RRW recognize that LEP has worked well and concede that it can
probably maintain warheads over the short term. Their concern is with maintaining
reliability of warheads over the long term. They assert that LEP is not suited to the
task because it will become harder to make it work as the technology under which
current warheads were created becomes increasingly archaic and as materials,
equipment, processes, and skills become unavailable. They maintain that if the labs
were to lose confidence that they could replicate NEP components to near-original
designs using near-original materials and processes, the United States could
ultimately face a choice between resuming nuclear tests or accepting reduced
confidence in reliability. Instead, for example, the three nuclear weapons laboratories
(Los Alamos, Livermore, and Sandia) argue that a “vision of sustainable warheads
with a sustainable [nuclear] enterprise can best be achieved by shifting from a
program of warhead refurbishment to one of warhead replacement.”23
Advocates of RRW note further that while the current stockpile — most units
of which were manufactured between 1979 and 1989 — was designed to deter and,
if necessary, defeat the Soviet Union, the threat, strategy and missions have changed,
leaving the United States with the wrong stockpile for current circumstances.
Ambassador Brooks said that current warheads are wrong technically because “we
would [now] manage technical risk differently, for example, by ‘trading’ [warhead]
size and weight for increased performance margins, system longevity, and ease of
manufacture.” These warheads were not “designed for longevity” or to minimize
22 Brooks statement to Senate Armed Services Committee, Apr. 4, 2005, p. 2.
23 K. Henry O’Brien et al., Sustaining the Nuclear Enterprise — A New Approach, published
jointly by Lawrence Livermore, Los Alamos, and Sandia National Laboratories, UCRL-AR-
212442, May 20, 2005, p. 3.

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cost, and may be wrong militarily because yields are too high and “do not lend
themselves to reduced collateral damage.” They also lack capabilities against buried
targets or biological and chemical munitions, and they do not take full advantage of
precision guidance.24 Furthermore, LEP’s critics believe the stockpile is wrong
politically because it is too large:
We retain “hedge” warheads in large part due to the inability of either today’s
nuclear infrastructure, or the infrastructure we expect to have when the stockpile
reductions are fully implemented in 2012, to manufacture, in a timely way,
warheads for replacement or for force augmentation, or to act to correct
unexpected technical problems.25
Finally, they believe the stockpile is wrong in terms of physical security because it
was not designed for a scenario in which terrorists seize control of a nuclear weapon
and try to detonate it in place. According to Brooks, “If we were designing the
stockpile today, we would apply new technologies and approaches to warhead-level
use control as a means to reduce physical security costs.”26
RRW and the Transformation of Nuclear Warheads
The nuclear stockpile was designed to meet Cold War requirements. For
example, during the Cold War, high explosive yield per unit of warhead weight (the
“yield-to-weight ratio”) was of critical importance while cost, ease of manufacture,
and reduction of hazardous material were less important. While warheads must
continue to be safe and reliable, the importance of other constraints such as those just
mentioned has inverted in the past 15 years. New opportunities and requirements
have emerged as well. As a result, RRW advocates claim, it is necessary to
transform the stockpile to reflect these changes.
With RRW, NNSA and DOD are revisiting tradeoffs underlying the current
stockpile in order to adapt to post-Cold War changes and meet possible future
requirements. While RRW would change many tradeoffs significantly, the changes
would, in the view of NNSA and DOD, work out well: RRW would trade negligible
sacrifices to secure major gains. This section presents some Cold War warhead
requirements, how they have changed, and implications of these changes.
Efficiency. A major characteristic of warheads for ballistic missiles was a high
yield-to-weight ratio.27 Lower weight let each missile carry more warheads to more
distant targets; higher yield gave each warhead a better chance of destroying its
target; and increasing yield-to-weight enabled these goals to be met at the same time.
For example, the W88 warhead for the Trident II (D5) submarine-launched ballistic
missile uses a conventional high explosive (CHE) that is more sensitive to impact
than insensitive high explosive (IHE) used on many other warhead types. IHE is
24 Ibid., pp. 2-3.
25 Ibid., p. 3.
26 Ibid., p. 4.
27 Bombs were less constrained in weight because bombers carry heavier loads than missiles.

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CRS-10
safer to handle, but CHE packed more energy per unit weight. A missile could carry
the lighter CHE warheads to a greater distance, so a submarine could stand off farther
from its targets. Increased ocean patrol area forced the Soviet Union to spread out
its antisubmarine assets, improving submarine survivability. Hard-to-manufacture
designs, hazardous materials, and other undesirable features were deemed acceptable
tradeoffs to maximize yield-to-weight. Now, ballistic missiles carry fewer warheads
than they did during the Cold War due to reduced targeting requirements. As a
result, it is possible to revisit the Cold War tradeoffs, redesigning warhead
components to give greater emphasis to other characteristics at the expense of yield
and weight. For example, with a missile’s carrying capacity divided among fewer
warheads, each warhead can be heavier,28 and the added weight can be allocated to
design features that improve use control, margin (excess performance designed into
a warhead beyond the minimum required), ease of production, and the like.
Yield. During the Cold War, DOD required a substantial yield for its strategic
warheads. Yield compensated for inaccuracy in attacking targets such as missile
silos, which were hardened to withstand all but near misses or direct hits. Yield was
also important for attacking targets covering large areas, such as shipyards or
petroleum refineries. Now, high yield is much less important. There are likely to be
fewer area targets in the future. Precision guidance enables conventional bombs to
score direct hits on targets, and similar technology could apparently be used to make
missile-delivered nuclear warheads more accurate, permitting lower yield. Indeed,
some argue that the United States needs some lower-yield warheads.29 In this view,
lower-yield warheads would create less unintended damage that might prevent the
United States from using them. Such warheads, some argue, would be a better
deterrent precisely because their use would be more credible.
Nuclear Testing. Between 1945 and 1992, the United States conducted over
1,000 nuclear tests, mostly for weapons design.30 These tests added confidence that
a weapon incorporating hard-to-manufacture components was made correctly, that
a weapon would work at the extremes of temperatures to which it might be exposed,
and that the design was satisfactory in other ways. Testing also enabled the labs to
validate changes to existing warhead designs. With the congressionally-imposed
28 Ballistic missiles carry warheads inside reentry vehicles (RVs). An RV is a streamlined
shell that protects its warhead from the intense heat and other stresses of reentering the
atmosphere at high speed. RVs are designed to carry a specific type of warhead on a
specific missile; the maximum stress that the RV encounters is carefully studied. Increasing
warhead weight significantly would increase these stresses, possibly causing the RV to fail
and the warhead to burn up, fail, or miss its target by a wide margin.
29 Bryan Fearey, Paul White, John St. Ledger, and John Immele, “An Analysis of Reduced
Collateral Damage Nuclear Weapons,” Comparative Strategy, Oct./Nov. 2003, pp. 313-315.
These lower-yield weapons are not necessarily the very low yield “mini-nukes” debated in
Congress in recent years.
30 The United States conducted 1,030 tests, of which 883 were weapons related. (The
United Kingdom conducted another 24 tests at the Nevada Test Site.) U.S. Department of
Energy, Nevada Operations Office, Office of External Affairs, United States Nuclear Tests,
July 1945 through September 1992, DOE/NV-209, rev. 14, Dec. 1994, p. viii.

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U.S. nuclear test moratorium in October 1992,31 the United States can no longer rely
on tests to validate designs. While there are no military requirements for nuclear
weapons with new or modified military capabilities,32 any future weapon would have
to be more conservatively designed than those that could be tested, such as by staying
within design parameters that past nuclear tests have validated.
Performance, Schedule, and Cost Tradeoffs. Performance has always
been the dominant consideration for nuclear weapons. Weapons must meet standards
for safety and reliability, and meet other military characteristics. During the Cold
War, schedule was also critical. With new missiles and nuclear-capable aircraft
entering the force at a sustained pace, warheads and bombs had to be ready on a
schedule dictated by their delivery systems. As a result, “our nuclear warheads were
not designed ... to minimize DOE and DOD costs.”33 Now, reducing cost has a
higher priority. Cost reduction is also more feasible: performance is still dominant,
but no external threat drives the schedule.
Environment, Safety, and Health (ES&H). During the Cold War, the
urgency of production and limited knowledge of the ES&H effects of materials used
or created in the nuclear weapons enterprise led to the use of hazardous materials,
dumping contaminants onto the ground or into rivers, exposing citizens to radioactive
fallout from nuclear tests, and the like. Now, ES&H concerns have grown within the
Complex, reflecting their rise in civil society at large, leading to a strong interest in
minimizing the use of hazardous materials in warheads and their production.
Skill Development and Transfer. During the Cold War, the design of
dozens of warhead types, the conduct of over 1,000 nuclear tests, and the production
of thousands of warheads exercised the full range of nuclear weapon skills. Now,
with no design or testing, no new-design warheads being produced, and with
warheads being refurbished at a slower pace than that at which they were originally
produced, some have raised concern that Complex personnel are not adequately
challenged. In this view, skill development and transfer can no longer be simply a
byproduct of the work, but must be an explicit goal of the nuclear weapons program.
RRW and Nuclear Weapons Enterprise Transformation
Supporters see RRW as the basis for more than addressing warhead issues.
Representative David Hobson, Chairman of the House Energy and Water
Development Appropriations Subcommittee in the 108th and 109th Congresses, was
the prime sponsor of the effort to establish RRW. He expressed concern about the
31 The moratorium was begun pursuant to Section 507 of P.L. 102-377, FY1993 Energy and
Water Development Appropriations Act, signed into law Oct. 2, 1992.
32 Brooks stated, “We must preserve the ability to produce weapons with new or modified
military capabilities if this is required in the future. Currently the DOD has identified no
requirements for such weapons, but our experience suggests that we are not always able to
predict our future requirements.” Brooks statement to Senate Armed Services Committee,
Apr. 4, 2005, p. 6, emphasis added.
33 Brooks statement to Senate Armed Services Committee, Apr. 4, 2005, p. 3.

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CRS-12
direction of nuclear policy. In introducing the FY2005 energy and water bill (H.R.
4614) to the House, he emphasized the need to redirect the Complex:
much of the DOE weapons complex is still sized to support a Cold War
stockpile. The NNSA needs to take a ‘time-out’ on new initiatives until it
completes a review of its weapons complex in relation to security needs, budget
constraints, and [a] new stockpile plan.34
At a National Academy of Sciences symposium in August 2004, he expressed
concern about Administration nuclear policies and programs:
I was not comfortable with the Administration’s emphasis on new nuclear
weapons initiatives in the fiscal year 2004 budget request and repeated in the
fiscal year 2005 request. I view the Advanced Concepts research proposal, the
Robust Nuclear Earth Penetrator study, and the effort to reduce the nuclear test
readiness posture to 18 months as very provocative and overly aggressive
policies that undermine our moral authority to argue that other nations should
forego nuclear weapons. We cannot advocate for nuclear nonproliferation
around the globe and pursue more useable nuclear weapon options here at home.
That inconsistency is not lost on anyone in the international community.35
He saw RRW as a key part of his effort to redirect U.S. nuclear strategy, reshape
the nuclear weapons stockpile and Complex to support that strategy, undertake
weapons programs consistent with that strategy, and reject those inconsistent with it.
I think the time is now for a thoughtful and open debate on the role of nuclear
weapons in our country’s national security strategy. There is still a basic set of
questions that need to be addressed and let me talk about some of those. How
large a stockpile should we maintain, should we have a set of older weapons with
many spares or should we have a smaller stockpile of more modern weapons?
What design and manufacturing capabilities do we need to maintain the DOE
nuclear weapons complex? And where should these complexes be located? And
finally, is this the best use of our limited, financial resources for national
defense? ... until we have this debate and develop a comprehensive plan for the
U.S. nuclear stockpile and the DOE weapons complex, we’re left arguing over
isolated projects such as the robust nuclear penetrator or the RNEP study....36
Representative Hobson also stated:
The Reliable Replacement Warhead concept will provide the research and
engineering problems necessary to challenge the workforce while at the same
time refurbishing some existing weapons in the stockpile without developing a
34 Congressional Record, June 25, 2004, p. H5085.
35 Rep. David Hobson, “Remarks by Chairman David Hobson — House Appropriations
Subcommittee on Energy and Water Development, [to the] National Academy of Sciences,
Committee on International Security and Arms Control, Symposium on ‘Post-Cold War U.S.
Nuclear Strategy: A Search for Technical and Policy Common Ground,’” Aug. 11, 2004, p.
3; available at [http://www7.nationalacademies.org/cisac/Hobson_Presentation.pdf].
36 Congressman David Hobson, “U.S. Nuclear Security in the 21st Century,” address to the
Arms Control Association, Washington, DC, Feb. 3, 2005. (Transcript as delivered.)

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CRS-13
new weapon that would require underground testing to verify the design. A more
robust replacement warhead, from a reliability standpoint, will provide the
stockpile hedge that is currently provided by retaining thousands of unnecessary
warheads.37
Thus while the FY2005 omnibus appropriations conference report and NNSA’s
FY2006 budget request presented a program of narrow scope, Representative Hobson
envisioned that RRW could be much more consequential. NNSA Administrator
Brooks agreed. In testimony of April 2005, he presented an expansive view of the
transformation of the nuclear weapons enterprise, with RRW as its pivot point.
Let me briefly describe the broad conceptual approach for stockpile and
infrastructure transformation. The “enabler” for such transformation, we believe,
is the RRW program. To establish the feasibility of the RRW concept, we will
use the funds provided by Congress last year and those requested this year to
begin concept and feasibility studies on replacement warheads or warhead
components that provide the same or comparable military capabilities as existing
warheads in the stockpile. If those studies suggest the RRW concept is
technically feasible, and if, as I expect, the Department of Defense establishes
a requirement, we should be able to develop and produce by the 2012-15
timeframe a small build of warheads in order to demonstrate that an RRW system
can be manufactured and certified without nuclear testing.
Once that capability is demonstrated, the United States will have the option to:
• truncate or cease some ongoing life extension programs for the legacy
stockpile,
• apply the savings from the reduced life extension workload to begin to
transform to a stockpile with a substantial RRW component that is both easier
and less costly to manufacture and certify, and
• use stockpile transformation to enable and drive consolidation to a more
responsive infrastructure.38
RRW is also linked to transforming the Complex into the responsive
infrastructure envisioned in the Nuclear Posture Review. An NNSA official stated,
By “responsive” we refer to the resilience of the nuclear enterprise to
unanticipated events or emerging threats, and the ability to anticipate innovations
by an adversary and to counter them before our deterrent is degraded. ... much
remains to be done to achieve stockpile and infrastructure transformation. ... The
“enabler” for transformation is our concept for the RRW. The RRW will benefit
from relaxed Cold War design constraints that maximized yield to weight ratios.
This will allow us to design replacement components that are easier to
manufacture; are safer and more secure; eliminate environmentally dangerous,
reactive, and unstable materials ... RRW, we believe, will provide enormous
37 Congressman David Hobson, “U.S. Nuclear Security in the 21st Century,” address to the
Arms Control Association, Washington, DC, Feb. 3, 2005. (Remarks as prepared for
delivery.)
38 Brooks statement to Senate Armed Services Committee, Apr. 4, 2005, p. 6.

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leverage for a more efficient and responsive infrastructure and opportunities for
a smaller stockpile.39
Thomas D’Agostino, then NNSA Deputy Administrator for Defense Programs,
said, “We have worked closely with the DoD to establish goals for ‘responsiveness,’
that is, timelines to address stockpile problems or deal with new or emerging threats.
For example, our goal is to understand and fix most problems in the stockpile within
12 months of their discovery.”40 To meet these goals, NNSA has proposed a
“Complex 2030” plan for restructuring the Complex.41 It would consolidate fissile
material, eliminate some redundancies in R&D facilities, and consolidate elements
of the current Complex. It assumes Complex reconfiguration completed around
2030. As a result, even if the United States proceeds with RRW, the Complex
would, for decades, need to support current warheads and RRWs simultaneously, so
a Complex-in-transition would support a stockpile-in-transition. Because RRW
would be designed in part for ease of manufacture, advocates claim it would permit
a simpler a smaller and less costly Complex. In NNSA’s view, Complex 2030,
combined with easier-to-produce RRWs, would be more responsive to DOD’s needs
than the current Complex. Another plan, by a Secretary of Energy Advisory Board
task force, proposed a greater level of consolidation of production, experimental
equipment, and uranium and plutonium than the Complex 2030 plan.42 One of its
elements was a Consolidated Nuclear Production Center (CNPC), which would
produce all uranium and plutonium components for nuclear weapons, as well as
assembling, surveilling, and disassembling weapons, and storing all weapons not in
DOD custody.43
In discussing the FY2007 Energy and Water Development Appropriations Bill,
H.R. 5427, Representative Hobson said, “The committee views the reform of the
weapons complex as a package deal. We will move forward with a reliable
replacement warhead but only if accompanied by actions to consolidate the footprint
of production complex, consolidating special nuclear fuel materials and accelerating
dismantlement.”44 In a letter to Secretary of Energy Samuel Bodman in November
2006, Representative Hobson expressed strong concern that DOE had decided not to
39 “Statement of Thomas P. D’Agostino, Deputy Administrator for Defense Programs,
National Nuclear Security Administration, Before the House Armed Services Committee,
Subcommittee on Strategic Forces,” April 5, 2006, p. 3, 6.
40 “Statement of Thomas P. D’Agostino ...,” April 5, 2006, p. 4.
41 U.S. Department of Energy. National Nuclear Security Administration. Office of Defense
Programs. Complex 2030: An Infrastructure Planning Scenario for a Nuclear Weapons
Complex Able to Meet the Threats of the 21st Century, DOE/NA-0013, October 2006.
42 U.S. Department of Energy. Secretary of Energy Advisory Board. Nuclear Weapons
Complex Infrastructure Task Force. Recommendations for the Nuclear Weapons Complex
of the Future, 2005.
43 Ibid., p. 14.
44 U.S. Congress. Congressional Record, May 24, 2006, p. H3158

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analyze the SEAB plan and instead considered Complex 2030 as its proposed
action.45 He wrote:
If the Department is not willing to conduct a thorough and objective analysis of
all reform alternatives including the CNPC, and instead is determined to conduct
an obviously prejudicial process aimed at ensuring the Department’s preferred
outcome, then I will not support funding for the Complex 2030 efforts, including
the Reliable Replacement Warhead (RRW) program. RRW is a deal with
Congress, but the deal requires a serious effort by the Department to modernize,
consolidate, and downsize the weapons complex. Absent that, there is no deal.46
RRW Program Developments
Representatives of the Office of the Secretary of Defense, the armed services,
and NNSA participate in the Nuclear Weapons Council, which under 10 U.S.C. 179
coordinates their efforts in this area. The council approved forming a DOD-DOE
Project Officers’ Group (POG) for the RRW program in March 2005. According to
NNSA, the POG is composed of representatives of NNSA, the nuclear weapon labs
(Los Alamos, Lawrence Livermore, and Sandia), the Office of the Secretary of
Defense, the U.S. Strategic Command, the Navy, the Air Force, and Lockheed Martin
Space Systems Company.47 There are also observers from the Office of the Chief of
Naval Operations, the Defense Threat Reduction Agency, and three nuclear weapon
plants (Kansas City, Pantex, and Y-12).48 In practice, POGs do not take votes, so
members and observers participate on an equal footing. The Nuclear Weapons
Council tasked the POG to conduct an 18-month design competition, which started
with the first POG meeting in May 2005. In the competition, two teams — Los
Alamos and Sandia New Mexico, and Lawrence Livermore and Sandia California —
were tasked to provide warhead designs consistent with RRW program objectives.
The council set the terms of reference for the designs in a memorandum to the POG.
DOD requested that the study be done as a competition between the two teams rather
than as a collaboration, according to NNSA.
By February 2006, the two teams had become fully confident that their designs
would meet military requirements, would not require nuclear testing to certify, and
would meet other criteria including ease of manufacturing, reduction in the use of
45 DOE announced this decision in “Notice of Intent to Prepare a Supplement to the
Stockpile Stewardship and Management Programmatic Environmental Impact Statement —
Complex 2030,” in U.S. National Archives and Records Administration. Office of the
Federal Register. Federal Register, October 19, 2006, p. 61731-61736.
46 Letter from David L. Hobson, Chairman, Energy and Water Development Appropriations
Subcommittee, to Samuel W. Bodman, Secretary of Energy, November 16, 2006.
47 Lockheed Martin Space Systems Company, a subsidiary of Lockheed Martin Corporation,
and its predecessor organizations have developed and manufactured all U.S. SLBMs. This
company is on the POG to provide expertise on compatibility of candidate SLBM
replacement warhead designs with their delivery system, Trident II missiles.
48 The Savannah River Site, another nuclear weapons plant, is not involved in the POG
because it does not design warhead components; its role is to supply tritium for warheads.

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CRS-16
hazardous and exotic materials, and significantly enhanced safety and use control.
The teams completed their preliminary designs in March 2006, and released their
designs to the competing team. Over the next few months, the labs, POG, and NNSA
reviewed and analyzed candidate design concepts. On November 30, 2006, the POG
briefed the council on RRW, and the council determined that RRW “is feasible as a
strategy for sustaining the nation’s nuclear weapons stockpile for the long-term
without underground nuclear testing.” According to a December 1 press release, the
council is expected to select a preferred design “in the next few weeks.”49
The competing designs are for a submarine-launched ballistic missile (SLBM)
replacement warhead. This is consistent with a statement in a House Armed Services
Committee report: “the committee encourages the Department of Defense and the
Department of Energy to focus initial Reliable Replacement Warhead efforts on
replacement warheads for Submarine Launched Ballistic Missiles.”50 Specifically,
the designs seek to provide the military capability of the W76 warhead. Because of
this SLBM focus, the Navy is the POG chair, and the Air Force is co-chair. At the
same time, the designs are made so that they can also be used on land-based
intercontinental ballistic missiles. In this way, the RRW could serve as a backup in
case ICBM warheads encountered a problem. This approach could permit reducing
the number of warhead types, meeting an objective in the House Appropriations
Committee’s energy and water report: “A more reliable replacement warhead will
allow long-term savings by phasing out the multiple redundant Cold War warhead
designs that require maintaining multiple obsolete production technologies to
maintain the older warheads.”51
NNSA is expected to request FY2008 funds to prepare a detailed design, assess
technical feasibility, and develop an estimate of cost and schedule.52 NNSA plans to
conduct engineering development of the selected design beginning by the start of
FY2010. The FY2007 National Defense Authorization Act (P.L. 109-364, Section
3111) sets as an objective having the first production unit (FPU, the first complete
warhead from a production line certified for deployment) of RRW in 2012, and the
FPU is scheduled for September 2012. There is some uncertainty about NNSA’s
ability to meet the FPU date. Barry Hannah, Chairman of the RRW POG, stated, “I
49 U.S. Department of Energy. National Nuclear Security Administration. “Nuclear Weapons
Officials Agree to Pursue RRW Strategy.” Press release, December 1, 2006.
50 U.S. Congress, House Committee on Armed Services, National Defense Authorization Act
for Fiscal Year 2006, H.Rept. 109-89, to accompany H.R. 1815, 109th Cong., 1st Sess., 2005,
p. 464.
51 U.S. Congress, House Committee on Appropriations, Energy and Water Development
Appropriations Bill, 2006, H.Rept. 109-86, to accompany H.R. 2419, 109th Cong., 1st Sess.,
2005, p. 130.
52 For a description of the phases of development of nuclear weapons other than new ones,
such as refurbishments, modernizations, and life extensions, see U.S. Department of
Defense and Department of Energy. Nuclear Weapons Council, Procedural Guideline for
the Phase 6.X Process, Apr. 19, 2000.

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believe that an FPU of FY2012 for the first RRW is extremely optimistic.”53 Each
year, it would be up to Congress to decide whether to fund the program as requested,
modify it, or cancel it.
RRW involves plants as well as labs. The plants involved in RRW (Kansas
City, Pantex, and Y-12) provided the labs with design information beginning at an
early stage. They are working with the labs and NNSA to identify options for
manufacturing processes and infrastructure transformation, such as steering the labs
away from hard-to-manufacture designs. The contribution of the plants will change
over time as the designs become more mature, at which time designers would be in
a position to accept detailed recommendations on manufacturing from the plants.
The results of this work, NNSA states, will be incorporated in the design and cost
study. This role of the plants is in keeping with numerous congressional statements
that ease and safety of manufacture, cost savings, and reduction of hazardous
materials are goals of RRW.
Congressional Action on the FY2006 RRW Request
Consistent with congressional action in FY2005, NNSA requested $9.4 million
for RRW for FY2006.54 The request stated that the program “is to demonstrate the
feasibility of developing reliable replacement components that are producible and
certifiable for the existing stockpile. The initial focus will be to provide cost and
schedule efficient replacement pits [see Appendix] that can be certified without
Underground Tests.”55
The House Appropriations Committee reported the FY2006 Energy and Water
Development Appropriations Bill, H.R. 2419, on May 18, 2005 (H.Rept. 109-86).
The bill passed the House, 416-13, on May 24 with no amendments to the Weapons
Activities section. In its report, the committee offered a “qualified endorsement” of
RRW “contingent on the intent of the program being solely to meet the current
military characteristics and requirements of the existing stockpile.” (p. 128) (Page
numbers in this section refer to H.Rept. 109-86.) It did not endorse RRW if it
produces new weapons for new military missions. (p. 128)
The committee saw RRW as part of a new Sustainable Stockpile Initiative,
under which DOE would “develop an integrated RRW implementation plan that
challenges the [nuclear weapons] complex to produce a RRW certifiable design
while implementing an accelerated warhead dismantlement program and an
53 Information provided by Dr. Barry Hannah, SES, Branch Head, Reentry Systems,
Strategic Systems Program, U.S. Navy, telephone conversation with the author, October 23,
2006.
54 U.S. Department of Energy, Office of Management, Budget, and Evaluation/CFO, FY2006
Congressional Budget Request, vol. I, National Nuclear Security Administration, DOE/ME-
0046, Feb. 2005, p. 68. (Hereafter cited as Department of Energy, FY2006 Congressional
Budget Request, vol. I.)
55 Department of Energy, FY2006 Congressional Budget Request, Vol. I, p. 82.

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infrastructure reconfiguration proposal that maximizes special nuclear material
[essentially, highly enriched uranium and weapons-grade plutonium] consolidation.”
(p. 128)
The committee focused on RRW throughout its discussion of Weapons
Activities, linked RRW to many Weapons Activities programs, and used the potential
of RRW as the rationale to reduce or delay several requested programs. Its many
actions and statements on RRW include the following:
! “The RRW weapon will be designed for ease of manufacturing,
maintenance, dismantlement, and certification without nuclear
testing, allowing the NNSA to transition the weapons complex away
from a large, expensive Cold War relic into a smaller, more efficient
modern complex. A more reliable replacement warhead will allow
long-term savings by phasing out the multiple redundant Cold War
warhead designs that require maintaining multiple obsolete
production technologies to maintain the older warheads.” (p. 128)
! “The Committee directs the Secretary of Energy to establish a
Federal Advisory Committee on the Reliable Replacement Warhead
initiative...” (p. 128)
! A rebaselined LEP, an RRW program plan, and a dismantlement
plan would provide “reliable nuclear deterrence” with a stockpile
after 2025 that is significantly smaller than the stockpile level
planned for 2012. As a result, “the current Life Extension Plans will
be scoped back to lower levels and the resources will be redeployed
to support the Sustainable Stockpile Initiative.” Accordingly, the
committee recommended reducing the budget request for Directed
Stockpile Work, a major category of Weapons Activities that
directly supports weapons in the stockpile, by $137.3 million to
$1,283.7 million. (p. 129)
! The committee recommended increasing RRW funding from $9.4
million to $25.0 million “to accelerate the planning effort to
initiative a competition between the NNSA weapons laboratories to
develop the design for the RRW re-engineered and remanufactured
warhead.” (p. 130)
! The committee recommended eliminating the $4.0 million requested
to study the Robust Nuclear Earth Penetrator, in part because it
“threatens Congressional and public support for sustainable
stockpile initiatives that will actually provide long-term security and
deterrent value for the Nation.” (p. 131)
! Test Readiness is a program to enable the resumption of nuclear
testing at Nevada Test Site should that be deemed necessary. Last
year, the committee opposed a move to reduce the test readiness
posture (the time between a presidential decision to test and the
conduct of the test) from 24 to 18 months, this year, it added RRW

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to the rationale against an 18-month posture: “The initiation of the
Reliable Replacement Warhead (RRW) program designed to provide
for the continuance of the existing moratorium on underground
nuclear testing by insuring the long-term reliability of the nuclear
weapons stockpile obviates any reason to move to a provocative 18-
month test readiness posture.” (p. 132) Accordingly, it recommended
reducing Test Readiness funds from $25.0 million to $15.0 million.
! The committee noted that “Congressional testimony by NNSA
officials is beginning to erode the confidence of the Committee that
the Science-based Stockpile Stewardship is performing as
advertised.” Accordingly, it “redirects ASCI [Advanced Simulation
and Computing] funding to maintain current life extension
production capabilities pending the initiation of the Reliable
Replacement Warhead program” and recommended reducing
funding from $660.8 million to $500.8 million. (pp. 133-134)
! The committee recommended eliminating the $7.7 million requested
for the Modern Pit Facility (see Appendix). It recommended that
“NNSA focus its efforts on how best to lengthen the life of the
stockpile and minimize the need for an enormously expensive
infrastructure facility until the long-term strategy for the physical
infrastructure of the weapons complex has incorporated the Reliable
Replacement Warhead strategy...” (p. 134)
! The committee recommended eliminating the $55.0 million
requested for construction of the Chemistry and Metallurgy Research
Facility Replacement (CMRR) at Los Alamos. “Construction at the
CMRR facility should be delayed until the Department [of Energy]
determines the long-term plan for developing the responsive
infrastructure required to maintain the nation’s existing nuclear
stockpile and support replacement production anticipated for the
RRW initiative.” (p. 136)
The House Armed Services Committee reported the FY2006 National Defense
Authorization Bill, H.R. 1815, on May 20 (H.Rept. 109-89). The bill passed the
House, 390-39, on May 25 with no amendments concerning RRW. The committee
recommended providing the amount requested for RRW. The report stated: “The
committee firmly believes that the nation must ensure that the nuclear stockpile
remains reliable, safe, and secure and that national security requires transforming the
Cold War-era nuclear complex. Thus, the committee supports the Reliable
Replacement Warhead program. To clearly articulate the congressional intent
underlying this program authorization, the committee further states the key goals of
the program.” (H.Rept. 109-89, p. 463) In Section 3111 of H.R. 1815, the committee
required the Secretary of Energy, in consultation with the Secretary of Defense, to
carry out the RRW program, and spelled out its objectives for RRW:
(b) Objectives- The objectives of the Reliable Replacement Warhead program
shall be —

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(1) to increase the reliability, safety, and security of the United States nuclear
weapons stockpile;
(2) to further reduce the likelihood of the resumption of nuclear testing;
(3) to remain consistent with basic design parameters by using, to the extent
practicable, components that are well understood or are certifiable without the
need to resume underground nuclear testing;
(4) to ensure that the United States develops a nuclear weapons infrastructure
that can respond to unforeseen problems, to include the ability to produce
replacement warheads that are safer to manufacture, more cost-effective to
produce, and less costly to maintain than existing warheads;
(5) to achieve reductions in the future size of the nuclear weapons stockpile
based on increased reliability of the reliable replacement warheads;
(6) to use the design, certification, and production expertise resident in the
nuclear complex to develop reliable replacement components to fulfill current
mission requirements of the existing stockpile; and
(7) to serve as a complement to, and potentially a more cost-effective and reliable
long-term replacement for, the current Stockpile Life Extension Programs.
The committee’s report (pp. 464-465) described these objectives in more detail.
Section 3111 of H.R. 1815 also required the Nuclear Weapons Council to submit an
interim report on RRW by March 1, 2006, and a final report by March 1, 2007. The
final report is to: assess characteristics of warheads to replace existing ones; discuss
the relationship of RRW within SSP and its impact on LEPs; assess the extent to
which RRW, if successful, could lead to a reduction in warhead numbers; discuss
RRW design criteria that will minimize the likelihood of nuclear testing; describe the
infrastructure needed to support RRW; and summarize how funds will be used.
Of the committee’s 28 Democratic members, 23 signed a statement of additional
views (H.Rept. 109-89, pp. 511-512). According to the statement, “Democrats are
willing to explore the concept of the RRW program, but do not yet embrace it.” They
felt that, to merit support, RRW must reduce or eliminate the need for nuclear testing,
lead to dramatic reductions in the arsenal, avoid introducing new mission or weapon
requirements, deemphasize nuclear weapons’ military utility, increase nuclear
security, and “[lead] to ratification and entry into force of the Comprehensive Test
Ban Treaty.” On the latter point, they maintained that a successful RRW program
should erase the main rationale against the treaty, uncertainty about the reliability of
the nuclear arsenal. Therefore, “[w]e believe strongly that ratification of the CTBT
[Comprehensive Test Ban Treaty] is the logical end result of a successful RRW
program...”
The Senate Armed Services Committee reported the FY2006 National Defense
Authorization Bill, S. 1042, on May 17.56 It recommended providing the amount
56 Material in this paragraph is from U.S. Congress, Senate Committee on Armed Services,
(continued...)

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CRS-21
requested for RRW. It noted that NNSA Administrator Brooks had presented several
goals for RRW in his testimony to the committee on April 4:
! increasing warhead security and reliability;
! developing replacement components that can be manufactured more
easily, using materials that are more readily available and more
environmentally benign;
! developing replacement components that provide high confidence in
warhead safety and reliability;
! developing these components on a schedule that would reduce the
need to conduct a nuclear test to address a reliability problem;
! reducing the cost and increasing the responsiveness of the
infrastructure; and
! increasing confidence in the stockpile enough to permit reductions
in non-deployed warheads.
“The committee supports these goals and this modest investment in feasibility
studies.” It required NNSA’s Administrator to submit a report to the congressional
defense committees by February 6, 2006, “describing the activities undertaken or
planned for any RRW funding in fiscal years 2005, 2006, and 2007.” The bill passed
the Senate, 98-0, on November 15. The reporting requirement was superseded by a
similar requirement in the conference bill.
The defense authorization conference bill, as reported (H.Rept. 109-360)
December 8, included the House provision on RRW with a few changes, such as
having the required reports prepared by the Secretaries of Energy and Defense rather
than by the Nuclear Weapons Council. The revised provision became section 3111
of the conference bill. Conferees stated:
The conferees support the goal of continuing to ensure that the nuclear weapons
stockpile remains safe, secure, and reliable. The conferees believe that the
Reliable Replacement Warhead program is essential to the achievement of this
goal and support its establishment with the objectives as defined in the provision
[section 3111], and as further described in the committee reports of the
Committees on Armed Services of the Senate and the House of Representatives
for fiscal year 2006.57
The measure was signed into law (P.L. 109-163) January 6, 2006.
56 (...continued)
National Defense Authorization Act for Fiscal Year 2006, report to accompany S. 1042,
109th Congress, 1st sess., S.Rept. 109-69, (Washington: GPO, 2005), p. 482.
57 U.S. Congress. Committee of Conference, National Defense Authorization Act,
conference report to accompany H.R. 1815, 109th Congress, 1st session, H.Rept. 109-360,
2005, p. 900.

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CRS-22
The Senate Appropriations Committee reported H.R. 2419 on June 16.58 It
endorsed RRW and recommended increasing its funding above the FY2006 request.
The Committee recognizes that RRW is early in its development and will not
significantly alter the near-term plans for stockpile support such as LEPs, but
NNSA is encouraged to move aggressively to incorporate benefits from RRW
into the stockpile as soon as possible.
The Committee recommends $25,351,000 for RRW to accelerate the
planning, development and design for a comprehensive RRW strategy that
improves the reliability, longevity and certifiability of existing weapons and their
components.59
The bill passed the Senate, 92-3, on July 1, with no change to the RRW provision.
Conferees on the energy and water bill reported H.R. 2419 (H.Rept. 109-275)
on November 7, 2005. The House agreed to the conference bill, 399-17, on
November 9, and the Senate agreed to it, 84-4, on November 14. The President
signed it into law (P.L. 109-103) November 19. The bill provides $25.0 million for
RRW. Conferees wanted the Complex to use various resources “to support a Nuclear
Weapons Council determination in November 2006.”60 This determination would
be a decision on which design to use for the first reliable replacement warhead.
Conferees also emphasized goals and requirements of the RRW program:
The conferees reiterate the direction provided in fiscal year 2005 that any
weapon design work done under the RRW program must stay within the military
requirements of the existing deployed stockpile and any new weapon design must
stay within the design parameters validated by past nuclear tests. The conferees
expect the NNSA to build on the success of science-based stockpile stewardship
to improve manufacturing practices, lower costs and increase performance
margins, to support the Administration’s decision to significantly reduce the size
of the U.S. nuclear stockpile.61
In sum, Congress supported RRW in various ways in the FY2006 budget cycle.
Both Armed Services Committees recommended fully funding the request, both
Appropriations Committees recommended a sharp increase in RRW funding, and
Congress appropriated $25.0 million, reduced to $24.75 million by a rescission.62
58 U.S. Congress, Senate Committee on Armed Services. Energy and Water Appropriations
Bill, 2006, S.Rept. 109-84, to accompany H.R. 2419. 109th Congress, 1st sess., 2005.
59 Ibid., p. 155.
60 U.S. Congress. Committee of Conference, Making Appropriations for Energy and Water
Development for the Fiscal Year Ending September 30, 2006, and for Other Purposes,
H.Rept. 109-275, to accompany H.R. 2419. 109th Congress, 1st sess., 2005, pp. 158-159.
61 Ibid., p. 159.
62 “The FY 2006 [amount] includes an across-the-board rescission of 1 percent in
accordance with the Department of Defense Appropriations Act, 2006, P.L. 109-148.” U.S.
Department of Energy, Office of Chief Financial Officer, FY2007 Congressional Budget
(continued...)

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CRS-23
The four committees saw RRW as a way to achieve a wide range of goals for the
nuclear weapons program, spelled out many of these goals in legislation and in
committee reports, and required several reports to track the status of RRW.
Congressional Action on the FY2007 RRW Request
NNSA’s FY2007 budget document63 evidenced a program that gained
momentum in the preceding year. The request for RRW was $27.7 million, up from
$24.8 million for FY2006. (p. 71) (Page numbers in parentheses in the next few
paragraphs refer to NNSA’s FY2007 budget document.) Outyear budgets are:
FY2008, $14.6 million; FY2009, $29.7 million; FY2010, $29.6 million; and
FY2011, $28.7 million. (p. 72) The FY2006 budget request document contained few
references to RRW because the program received its first funding just two months
before that document was released. In contrast, the FY2007 document contains 30
or more references to RRW that show many sites and programs linked to RRW.
Programs are discussed below; sites include Kansas City Plant (p. 620), Livermore
(p. 627), Los Alamos (p. 635), Pantex (p. 646), Sandia (p. 651), and Y-12 (p. 665).
What emerges is a program that is drawing on many resources of the Complex
beyond the program’s own budget. This is in accord with a directive in the FY2006
energy and water conference report:
The conferees expect that the laboratories and plants will also utilize the existing
resources in the Directed Stockpile, Campaigns, and Readiness in Technical Base
and Facilities accounts [the three largest accounts of the Stockpile Stewardship
program] where applicable to further the RRW design options to support a
Nuclear Weapons Council determination in November 2006.64
Various programs expect to support RRW in many ways:
! “During the period FY 2007-2011, the Science Campaign will
endeavor to make significant progress toward providing the
experimental data and certification methodologies necessary to
support the current stockpile workload and future requirements that
will include the Reliable Replacement Warhead and reflect an
evolving stockpile.” (p. 96)
! Within the Dynamic Materials Properties program of the Science
Campaign, “A second principal effort is to characterize the reaction
kinetics and dynamics of high explosives, with special emphasis on
improving the modeling of insensitive high explosives that will be
62 (...continued)
Request, vol. 1, National Nuclear Security Administration, DOE/CF-002, Feb. 2006, p. 71.
63 Department of Energy, FY2007 Congressional Budget Request, vol. 1.
64 Committee of Conference, Making Appropriations for Energy and Water Development
for the Fiscal Year Ending September 30, 2006..., H.Rept. 109-275, pp. 158-159.

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CRS-24
used in replacement warheads to provide improved safety and
surety.” (p. 100)
! Within the Engineering Campaign, Enhanced Surveillance
deliverables in the outyears are planned to support Reliable
Replacement Warhead components assessment” (p. 116) and the
Enhanced Surety program “will support studies such as the Reliable
Replacement Warhead.” (p. 118)
! “Only through ASC [the Advanced Simulation and Computing
Campaign] simulations can National Nuclear Security
Administration (NNSA) determine the effects of changes to current
systems as well as margins and uncertainties in future and untested
systems, such as the RRW.” (p. 176)
! Within the Pit Manufacturing and Certification Campaign,
“Additional personnel will be hired and additional equipment
procured to support manufacture of existing pit types (or a RRW
pit),” and Los Alamos and Livermore “will continue planning and
development of integral experiments in FY 2007 in support of
certification of reliable replacement warhead pits.” (p. 191)
The budget document offers many details of the proposed program.
The Nuclear Weapons Council (NWC) approved the Reliable Replacement
Warhead (RRW) Feasibility Study which began in May 2005, and is expected to
take 18 months to complete. The goal of the RRW Study is to identify designs
that will sustain long term confidence in a safe, secure and reliable stockpile and
enable transformation to a responsive nuclear weapon infrastructure. The Joint
DOE/DOD RRW Project Officer’s Group (POG) was tasked to oversee a
laboratory design competition for a RRW warhead with the FPU [first production
unit] goal of FY 2012. The POG will assess technical feasibility including
certification without nuclear testing, design definition, manufacturing, and an
initial cost assessment to determine whether the proposed candidates will meet
the RRW study objectives and requirements. At the end of the study, the POG
will establish the preferred RRW design options and recommendations to the
NWC Standing and Safety Committee (NWCSSC) and NWC. ...
In FY 2007 specific activities include: with NWC approval, proceed with
detailed design and preliminary cost estimates of RRW concepts to confirm that
RRW designs provide surety enhancements, can be certified without nuclear
testing, are cost-effective, and will support both stockpile and infrastructure
transformation. (83)
Further, “The RRW budget will increase when the RRW option is selected and starts
development and production engineering activities.” (76)
The John Warner National Defense Authorization Act for Fiscal Year 2007, P.L.
109-364 (H.R. 5122), increased the amount requested by $20.0 million to support a
second RRW design competition. It required NNSA to submit a plan for transform
the Complex to achieve a responsive infrastructure by 2030 (Section 3111), with a

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CRS-25
report on the plan due February 1, 2007. An objective of the plan is “To prepare to
produce replacement warheads under the Reliable Replacement Warhead program
at a rate necessary to meet future stockpile requirements, commencing with a first
production unit in 2012 and achieving steady-state production using modern
manufacturing processes by 2025.” It required (Section 3116) NNSA to enter into an
arrangement with the National Academy of Sciences to have the latter prepare a study
of Quantification of Margins and Uncertainties, a method to assess the nuclear
stockpile. The study is to evaluate, among other things, “Whether the application of
the quantification of margins and uncertainty used for annual assessments and
certification of the nuclear weapons stockpile can be applied to the planned Reliable
Replacement Warhead program so as to carry out the objective of that program to
reduce the likelihood of the resumption of underground testing of nuclear weapons.”
As of December 2006, the study is anticipated for January 2008.65
There is no FY2007 Energy and Water Development Appropriations Act as of
January 2007; instead, Congress passed a continuing resolution (P.L. 109-383) to
fund energy and water and many other programs through February 15, 2007.
The House Appropriations Committee “supports the RRW, but only if it is part
of a larger package of more comprehensive weapons complex reforms.”66 It
criticized NNSA’s Complex 2030 plan as basically modernization in place, and
favored a plan by a DOE task force.67 It recommended $52.7 million for RRW, an
increase of $25.0 million, but fenced the latter amount until DOE provides the
committee with a “comprehensive complex transformation plan.”68 It directed NNSA
to engage the JASON Defense Advisory Group to “evaluate the competing RRW
designs” and to analyze “the feasibility of the fundamental premise of the RRW
initiative that a new nuclear warhead can be designed and produced and certified for
use and deployed as an operationally-deployed nuclear weapon without undergoing
an underground nuclear test.”69 The report is due March 31, 2007. Professor Roy
Schwitters, Chair of the JASON Steering Committee, met with House Appropriations
Committee staff and NNSA officials to set a schedule for the JASON study; the
schedule calls for a preliminary report to be submitted to NNSA by March 1, 2007,
an executive summary of the final report by August 1, 2007, and the final report by
65 Information provided by National Academy of Sciences, December 12, 2006.
66 U.S. Congress. House. Committee on Appropriations. Energy and Water Development
Appropriations Bill, 2007, H.Rept. 109-474 to accompany H.R. 5427, 109th Congress, 2nd
Session, 2006, p. 108.
67 Ibid., p. 107. For the task force plan, see U.S. Department of Energy. Secretary of Energy
Advisory Board. Nuclear Weapons Complex Infrastructure Task Force. Recommendations
for the Nuclear Weapons Complex of the Future, 2005.
68 House Committee on Appropriations, Energy and Water Development Appropriations
Bill, 2007, p. 108, 111.
69 Ibid., p. 109-110.

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CRS-26
October 1, 2007.70 The House passed the bill, 404-20, on May 24, 2006, with no
amendments to RRW provisions.
The Senate Appropriations Committee recommended $62.7 million for RRW.
The Committee ... recognizes the need to protect against unforeseen challenges
and urges the NNSA to accelerate the transition to a responsive infrastructure
and to proceed expeditiously with the RRW design. The Committee also realizes
that a dual track strategy of supporting eight legacy systems and a RRW program
is not sustainable and therefore has taken steps in this legislation to reduce the
number of legacy systems and begin the replacement with RRW designs. The
Committee has also initiated a second design competition for another RRW
design ...71
Regarding this second competition, the committee urged DOE and NNSA to “expand
the RRW program immediately to ensure that our strategic forces have at least two
different certified RRW warheads” to guard against a failure in one system. It
recommended that $10.0 million be used for this second competition, with a first
production unit goal of 2014.72 It recommended adding $4.0 million to “accelerate
the deployment” of surveillance devices into the RRW design.73 As of December
2006, the most recent action on the bill was that it was placed on the Senate
legislative calendar on June 29.
Congressional Action on the FY2008 RRW Request
The President submitted his FY2008 budget request to Congress on February
5, 2007. The NNSA request document presents details of the DOD-NNSA plan for
RRW. In November 2006,74 according to the document,
the NWC [Nuclear Weapons Council] decided that the RRW for submarine
launched ballistic missiles is feasible and should proceed to complete a Phase 2A
design definition and cost study. In addition, the NWC determined that the RRW
is to be adopted as the strategy for maintaining a long term safe, secure and
70 Information provided by Roy Schwitters, S.W. Richardson Foundation Regental Professor
of Physics, University of Texas at Austin, and Chair of the JASON Steering Committee,
email, January 29, 2007.
71 U.S. Congress. Senate. Committee on Appropriations. Energy and Water Appropriations
Bill, 2007, S.Rept. 109-274 to accompany H.R. 5427, 109th Congress, 2nd Session, 2006, p.
146.
72 Ibid., p. 148.
73 Ibid., p. 151.
74 U.S. Department of Energy. Office of Chief Financial Officer. FY 2008 Congressional
Budget Request. Volume 1, National Nuclear Security Administration. DOE/CF-014,
February 2007, p. 19. Available at [http://www.mbe.doe.gov/budget/08budget/Content/
Volumes/Vol_1_NNSA.pdf].

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CRS-27
reliable nuclear deterrent and as such also directed the initiation of a conceptual
study for an additional RRW design.75
The document also stated that the
shift in strategy from a Life Extension Program to a RRW program will require
substantial planning and resource realignments between the Departments of
Defense and Energy that will not be completed in time for the FY 2008 budget
submission. When planning is complete, expected at the end of FY 2007, an
RRW budget adjustment will be requested.76
It further stated that the budget approach for FY2008 for transforming the
nuclear stockpile included the following goal: “Maintain a relatively level DSW
[Directed Stockpile Work] budget with RRW development funded through
reductions in resources required to support legacy weapons.”77
While NNSA’s RRW budget figures are thus subject to revision, the projected
figures as presented are as follows (in millions): FY2008, $88.769; FY2009,
$99.787; FY2010, $109.240; FY2011, $167.358; and FY2012, $179.933.78 In
addition, the Navy requests $30.0 million for FY2008, and estimates a request of
$50.0 million for FY2009, for RRW.79 These figures are DOD funds to develop a
cost estimate and to “[c]ontinue the RRW Program into Phase 3 Engineering
Development, when approved by Congress and the Nuclear Weapons Council.”80
Examples of this work for RRW include development of an arming, fuzing, and
firing system and of “ancillary reentry body types,” as well as integration of RRW
with the Trident II (D5) missile that will carry the RRW.81 The Navy plans to award
contracts for at least $29.5 million of the FY2008 request in October 2007, and for
at least $49.0 million of the FY2009 request in October 2008.82 While keeping in
mind NNSA’s caveats, the projected total for RRW in the NNSA budget for FY2008-
FY2012 and the Navy budget for FY2008-FY2009 is $725.1 million.
75 Ibid., p. 88.
76 Ibid., p. 19.
77 Ibid., p. 64. Directed Stockpile Work, or DSW, is the part of the Weapons Activities
budget that involves work directly on nuclear weapons in the stockpile, such as monitoring
their condition; maintaining them through repairs, refurbishment, life extension, and
modifications; R&D in support of specific warheads; and dismantlement. “Legacy
weapons” are those currently in the stockpile, which were designed, tested, manufactured,
and deployed during the Cold War; the Life Extension Program is one of the programs
within the Stockpile Stewardship Program that is used to maintain them.
78 Ibid., pp. 75, 76.
79 U.S. Department of the Navy. Fiscal Year (FY) 2008/2009 Budget Estimates: Justification
of Estimates, Research, Development, Test & Evaluation, Navy, Budget Activity 7, February
2007, at [http://www.finance.hq.navy.mil/fmb/08pres/rdten/RDTEN_ba7_book.pdf], pages
(using pdf numbers) 24-25, 40-42.
80 Ibid., pdf p. 41.
81 Ibid.
82 Ibid., pdf p. 42.

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CRS-28
Policy Options for the 110th Congress
The RRW program has made considerable progress since its inception, opening
new choices for Congress.
Drop RRW. Congress could short-circuit the entire decision process that RRW
would entail by terminating RRW and proceeding with LEP only. CRS Report
RL33748 presents many arguments for and against this course of action.
Slow the pace of RRW. The first production unit of RRW is scheduled for
2012, though there are doubts about NNSA’s ability to meet that date, as noted
earlier. At the same time, the pit aging study referenced above has extended the
anticipated service life of pits considerably. Since one justification for proceeding
quickly with RRW was the fear that age-related defects might cause pits not to
function correctly by about the time a new pit manufacturing facility could become
operational, the extended “lease on life” offered by the pit aging report might permit
RRW to proceed at a slower pace. According to a press report,
Some members of Congress have said the plutonium studies raised questions
about the need for the RRW program. Rep. David L. Hobson ... said yesterday
that, based on the plutonium studies, “they should take a breath because there are
lots of demands for money.” He added: “Congress is not going to be as robust
about this though there is a need to have some scientific work done.”83
Gather more information. The 110th Congress will not need to make a final
decision to proceed with RRW. That decision will come due if NNSA requests funds
to begin full-scale development, currently expected around FY2010. Further, many
current unknowns could make a decision to proceed with RRW premature. Cost is
important to the decision, yet long-term cost projections are notoriously unreliable.
There are technical uncertainties, such as whether the winning RRW design can be
turned into a functioning warhead. The future Complex has yet to be determined,
along with how it might differ depending on whether the United States pursues LEP
or RRW and how it would handle a transition to an all-RRW stockpile. Stockpile
numbers decades out are unknowable, yet a Complex would spend money
unnecessarily if sized too large and could not support requirements if sized too small.
Unless it rejects RRW, Congress may wish to use the time before a decision must be
made to gather more information to bound these unknowns.
Examine the link between RRW and a reconfigured Complex. Many
in Congress, as well as NNSA, argue that the Complex must be streamlined and
consolidated to support RRW, and that RRW will permit a smaller and less costly
Complex because RRW components will be easier to manufacture and assemble and
will use less hazardous material. On the other hand, revising the Complex would be
very costly, as would production of perhaps thousands of RRWs, and the pit aging
study noted earlier may provide grounds for delaying a decision on Complex
83 Walter Pincus, “New Nuclear Weapons Program to Continue,” Washington Post, Dec. 2,
2006, p. 7.

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CRS-29
reconfiguration. Congress may wish to determine how long it would take for savings
from RRW and a reconfigured Complex to exceed the investment costs, with both
figures adjusted for net present value to reflect the time value of money.84 Congress
may also consider what upgrades the Complex would need in order to support LEPs.
Consider the scheduling of a second RRW design competition. A
congressional report called for a second competition. A second RRW, if designed
so that it could back up the first, would guard against the prospect that the failure of
one RRW type could force the withdrawal of part of the U.S. strategic nuclear force.
A second RRW design competition would also help maintain the RRW program. On
the other hand, the 2012 FPU for the first RRW appears optimistic, as noted, so a
2014 FPU for a second RRW may be as well. More time between a first and second
RRW would give more opportunity for refining RRW design and for feedback from
production to design. Further, alternate warheads for each type of long-range bomber
and missile are available if the first RRW encountered a problem. At issue are
whether to initiate a second RRW design competition and, if so, on what schedule.
Chronology, 2007-
01/00/08 —
Completion is anticipated for a National Academy of Sciences study
on Quantification of Margins and Uncertainties, a method to assess
the nuclear stockpile. Among other things, the study will evaluate if
this method can be applied to RRW. The study is required by P.L.
109-364, the FY2007 National Defense Authorization Act, Section
3116.
10/01/07 —
A final JASON report on RRW is scheduled to be completed. The
report is required by the House Appropriations Committee’s report
on FY2007 energy and water appropriations.
08/01/07 —
An executive summary of the JASON RRW report (see 10/01/07) is
scheduled to be completed.
03/01/07 —
A preliminary JASON report on RRW (see 10/01/07) is scheduled to
be completed.
03/01/07 —
The Secretary of Energy and Secretary of Defense are to submit a
final report to congressional defense committees on feasibility and
implementation of the RRW program, as required by P.L. 109-163,
FY2006 National Defense Authorization Act, Section 3111.
02/05/07 —
The President’s FY2008 budget request is to be presented to
Congress.
84 For further information on net present value, see U.S. Department of Defense. Office of
the Under Secretary of Defense for Acquisition, Technology, and Logistics. "Contract
Pricing Reference Guides," at Defense Procurement and Acquisition Policy website,
[http://www.acq.osd.mil/dpap/contractpricing/vol2chap9.htm].

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CRS-30
02/01/07 —
NNSA is to submit a plan on transforming the nuclear weapons
complex, as required by P.L. 109-364, the FY2007 National Defense
Authorization Act, Section 3111. An objective of the plan is “To
prepare to produce replacement warheads under the Reliable
Replacement Warhead program ...”
02/00/07 —
A study by a committee of the American Association for the
Advancement of Science is to be completed. The study will examine
whether RRW is the best path for addressing certain potential risks
of SSP and LEP and for developing a responsive infrastructure.

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CRS-31
Appendix. Nuclear Weapons, Nuclear Weapons
Complex, and Stockpile Stewardship Program
This report refers to nuclear weapons design, operation, and production
throughout. This Appendix describes key terms, concepts, and facilities as an aid to
readers not familiar with them.
Current strategic (long-range) and most tactical nuclear weapons are of a two-
stage design.85 The first stage, the “primary,” is an atomic bomb similar in principle
to the bomb dropped on Nagasaki. The primary provides the energy needed to trigger
the second stage, or “secondary.”
The primary has at its center a “pit,” a hollow core containing fissile material
(typically plutonium) and containment shells of other metals. It is surrounded by
chemical explosive shaped to generate a symmetrical inward-moving (implosion)
shock front. When the explosive is detonated, the implosion compresses the
plutonium, increasing its density so much that it becomes supercritical and creates
a runaway nuclear chain reaction. Neutrons drive this reaction by splitting
(fissioning) plutonium atoms, releasing more neutrons. But the chain reaction can
last only the briefest moment before the force of the nuclear explosion drives the
plutonium outward so that it becomes subcritical and can no longer support a chain
reaction. To increase the fraction of plutonium that is fissioned — boosting the yield
of the primary — a neutron generator injects neutrons into the fissioning plutonium.
Another system injects “boost gas” — a mixture of deuterium and tritium (isotopes
of hydrogen) gases — into the pit. The intense heat and pressure of the implosion
cause this gas to undergo fusion. While the fusion reaction generates energy, its
purpose is to generate a great many neutrons.
A metal “radiation case” channels the energy of the primary to the secondary,
which contains fission and fusion fuel. The energy ignites the secondary, which
releases most of the energy of a nuclear explosion. The primary, radiation case, and
secondary comprise the “nuclear explosive package.” Thousands of “nonnuclear”
components are also needed to make the nuclear explosive package into a militarily
usable weapon, such as an arming, firing, and fuzing system, an outer case, and
electrical and physical connections linking a bomb to an airplane or a warhead to a
missile.
Nuclear weapons were designed, tested, and manufactured by the nuclear
weapons complex, which is composed of eight government-owned contractor-
operated sites: the Los Alamos National Laboratory (NM) and Lawrence Livermore
National Laboratory (CA), which design nuclear explosive packages; Sandia National
Laboratories (NM and CA), which designs nonnuclear components; Y-12 Plant (TN),
which produces uranium components and secondaries; Kansas City Plant (MO),
which produces many of the nonnuclear components; Savannah River Site (SC),
which processes tritium from stockpiled weapons to remove decay products; Pantex
85 U.S. Department of Energy, Final Programmatic Environmental Impact Statement for
Stockpile Stewardship and Management, DOE/EIS-0236, Sept. 1996, summary volume, p.
S-4. That page contains further information on nuclear weapon design and operation.

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CRS-32
Plant (TX), which assembles and disassembles nuclear weapons; and the Nevada
Test Site, which used to conduct nuclear tests but now conducts other weapons-
related experiments that do not produce a nuclear yield. These sites are now involved
in disassembly, inspection, and refurbishment of existing nuclear weapons. The
National Nuclear Security Administration (NNSA), a semiautonomous part of the
Department of Energy, manages the nuclear weapons complex and program.
NNSA maintains nuclear weapons and associated expertise through the
Stockpile Stewardship Program (SSP), which Congress created in the FY1994
National Defense Authorization Act (P.L. 103-160, section 3138). The legislation
specified that the goal of SSP is “to ensure the preservation of the core intellectual
and technical competencies of the United States in nuclear weapons” through
“advanced computational capabilities,” “above-ground experiments” (experiments
not requiring nuclear testing), and construction of large experimental facilities. SSP
has three main elements. Directed Stockpile Work involves work directly on nuclear
weapons in the stockpile, such as monitoring their condition, maintaining them
through refurbishment and modifications, R&D in support of specific warheads, and
dismantlement. It includes the Life Extension Program and the RRW program.
Campaigns provide focused scientific and engineering expertise in support of
Directed Stockpile Work, in such areas as pit manufacturing and certification,
computation, and study of the properties of materials. Readiness in Technical Base
and Facilities funds infrastructure and operations at the nuclear weapons complex
sites. While the legislation did not specify that SSP was not to involve nuclear
testing, that goal seems clear from the history, and has become a goal of the program.
NNSA does not rule out the possible need for testing, such as if a problem were to
emerge in a warhead type that could not be remedied in any other way.

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