Order Code RL32347
CRS Report for Congress
Received through the CRS Web
“Bunker Busters”: Robust Nuclear Earth
Penetrator Issues, FY2005 and FY2006
Updated August 2, 2005
Jonathan Medalia
Specialist in National Defense
Foreign Affairs, Defense, and Trade Division
Congressional Research Service ˜ The Library of Congress

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“Bunker Busters”: Robust Nuclear Earth Penetrator
Issues, FY2005 and FY2006
Summary
Earth penetrator weapons, often called “bunker busters,” burrow into the ground
some tens of feet before detonating, greatly increasing their ability to destroy buried
targets. The United States has several types of conventional earth penetrators. The
current U.S. nuclear earth penetrator, the B61-11 bomb, cannot penetrate certain
types of terrain in which hardened underground facilities may be located, so the Air
Force and the National Nuclear Security Administration (NNSA) are studying a more
effective penetrator, the Robust Nuclear Earth Penetrator (RNEP).
While Secretary of Defense Rumsfeld said in 2003 that RNEP was a study,
NNSA’s FY2005 budget document showed a five-year total of $484.7 million if
RNEP were to proceed beyond the study phase. NNSA stated that no decision had
been made to proceed with RNEP and that out-year figures were shown to meet
congressionally-mandated budgeting requirements and were not a request. RNEP
requests are, of course, subject to congressional approval, rejection, or modification.
The five-year figure sparked congressional debate. The FY2005 National Defense
Authorization Act contained the full RNEP request, $27.6 million. The House
rejected an amendment by Representative Tauscher to transfer funds from RNEP and
the Advanced Concepts Initiative (ACI), another nuclear program, to Air Force
conventional munitions, and the Senate rejected an amendment by Senators Kennedy
and Feinstein to delete funds for RNEP and ACI. P.L. 108-447, the FY2005
Consolidated Appropriations Act, transferred the $9.0 million requested for ACI to
a different program and contained no funds for RNEP. As a result, NNSA cannot
work on RNEP in FY2005.
The FY2006 RNEP request is $4.0 million for NNSA for studies, and $4.5
million for the Department of Defense (DOD) to study integrating RNEP onto the
B-2 bomber. The House passed H.R. 2419, the FY2006 Energy and Water
Development Appropriations Bill, with no NNSA RNEP funds. The House passed
H.R. 1815, the FY2006 National Defense Authorization Bill, providing the DOD
funds as requested and transferring the NNSA funds to DOD. The House
Appropriations Committee’s mark of H.R. 2863, the FY2006 DOD Appropriations
Bill, provided $4.0 million for a study of a conventional (nonnuclear) penetrator.
Committee staff indicated that the bill includes the $4.5 million for DOD, and that
the committee’s intent is that DOD use the money to study integration of a
conventional penetrator onto the B-2. H.R. 2863 as passed by the House retained
these provisions. The Senate Armed Services Committee’s mark of S. 1042, the
FY2006 National Defense Authorization Bill, recommends providing the NNSA
funds as requested, but denying the DOD funds on grounds that the DOD program
should wait until completion of NNSA’s feasibility study. The Senate provided $4.0
million for NNSA for RNEP in H.R. 2419, rejecting an amendment by Senator
Feinstein to delete the funds.
This report will be updated to reflect further action on the FY2006 request.

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Contents
Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Technical Aspects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
The RNEP FY2005 Budget and Plan, and NNSA’s Explanation . . . . . . . . . . . . . 3
Criticisms, Questions, and Responses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Programmatic Questions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
RNEP Budget and Need for Congressional Approval . . . . . . . . . . . . . . . . . . 8
Is There a Military Requirement for RNEP? . . . . . . . . . . . . . . . . . . . . . . . . . 9
Legislative Activity on RNEP, FY2005 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Developments in the FY2006 Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
The FY2006 RNEP request . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Legislative Activity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Clarification of Key Points in FY2006 Hearings . . . . . . . . . . . . . . . . . . . . . 19

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“Bunker Busters”: Robust Nuclear Earth
Penetrator Issues, FY2005 and FY2006
Background
Potential adversaries and others have built hardened underground facilities to
protect key assets. Conventional weapons are unable to destroy many such facilities,
though opinions differ on whether nonnuclear means can disable or isolate them.
Surface-burst nuclear weapons would have limited effectiveness against such
facilities. In contrast, a weapon that burrows into the ground a few meters before
detonating would be more effective because it would transfer much more of its
energy into the ground. Accordingly, the Department of Defense (DOD) and the
National Nuclear Security Administration (NNSA), the Department of Energy (DOE)
agency in charge of the U.S. nuclear weapons program, have requested funds to study
the Robust Nuclear Earth Penetrator (RNEP).
RNEP has been the most controversial nuclear weapon program in Congress for
the last several years. Supporters argue that it is needed to attack hard and deeply
buried targets (such as leadership bunkers) in countries of concern, thereby deterring
or defeating challenges from such nations; critics assert that RNEP would lower the
threshold for use of nuclear weapons and prompt other nations to develop nuclear
weapons to deter U.S. attack. For FY2003, Congress provided $15.0 million as
requested, but for FY2004, it reduced the request from $15.0 million to $7.5 million,
and for FY2005 it eliminated RNEP funding. For FY2006, the Administration
requests $4.0 million for NNSA and $4.5 million for DOD to study RNEP.
This report presents a brief technical background on RNEP, then discusses the
history of RNEP in Congress and the Administration for the FY2005 and FY2006
budget cycles. For a more extensive history and technical background, see CRS
Report RL32130, Nuclear Weapon Initiatives: Low-Yield R&D, Advanced Concepts,
Earth Penetrators, Test Readiness. See also CRS Report RL32599, ‘Bunker
Busters’: Sources of Confusion in the Robust Nuclear Earth Penetrator Debate.
Technical Aspects
The United States has one type of nuclear earth penetrator, the B61-11 bomb,
which was accepted into the stockpile in September 2001.1 That weapon, though,
according to an article by several scientists from Los Alamos National Laboratory,
“cannot survive delivery into certain types of terrain in which such [hardened
1 “B61-11 Enters the Stockpile,” Weapons Insider: A Publication of the Nuclear Weapons
Program, Los Alamos National Laboratory, Sept./Oct. 2001, p. 2.

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underground] facilities may be located.”2 The Administration proposes RNEP as a
study of modifications to convert existing B83 nuclear bombs to an earth penetrator
configuration. (Another bomb, the B61, was also under consideration earlier.) While
the Air Force is leading the study, which started in May 2003, NNSA is in charge of
studying modifications of specific warheads.
The Bob Stump National Defense Authorization Act for FY2003, P.L. 107-314,
Section 1033, called for a National Academy of Sciences report on effects of nuclear
and conventional earth penetrator weapons (EPWs). The report, released in April
2005, addressed technical issues that have arisen in RNEP debates. It had nine key
conclusions: (1) many high-value buried facilities can be held at risk by nuclear but
not conventional EPWs; (2) penetration to a depth of 3 meters captures most effects
of EPWs on buried targets; deeper penetration puts the weapon at greater risk; (3)
EPWs cannot penetrate deeply enough to contain nuclear weapon effects fully; (4)
casualties from a nuclear weapon burst at shallow depth or on the surface are
essentially the same; (5) detonating a nuclear weapon at shallow depth increases the
energy transmitted to a buried target, permitting a reduction in yield by a factor of 15
to 25; (6) attacks using nuclear EPWs near urban areas could produce thousands to
over a million casualties, or hundreds to several hundred thousand for attacks in rural
areas; (7) a nuclear EPW could reduce civilian casualties in an urban area by a factor
of 2 to 10 compared to a surface-burst weapon with 25 times the yield; (8) a nuclear
weapon would have to detonate within a chamber where chemical or biological
agents were stored to destroy the agents; the same is true of nonnuclear
“thermobaric” bombs, which generate high heat and pressure; and (9) in a nuclear
attack on a chemical weapon facility, nuclear effects would probably kill many more
civilians than would the released chemical agent, while a nuclear attack on a
biological facility could kill similar numbers of civilians from nuclear effects and
released biological agents, depending on weapon yield and amount of agent.3
Nuclear earth penetrator weapons burrow into the ground a few meters before
detonating, greatly increasing their ability to destroy hardened underground targets.
The United States has one type of nuclear earth penetrator, the B61-11 bomb, which
was accepted into the stockpile in September 2001.4 That weapon, though, according
to an article by several scientists from Los Alamos National Laboratory, “cannot
survive delivery into certain types of terrain in which such [hardened underground]
facilities may be located.”5 The Robust Nuclear Earth Penetrator (RNEP) is at
present a study, begun in May 2003, of modifications to convert existing B83 nuclear
2 Bryan Fearey, Paul White, John St. Ledger, and John Immele, “An Analysis of Reduced
Collateral Damage Nuclear Weapons,” Comparative Strategy, Oct./Nov. 2003, p. 312.
3 National Academy of Sciences, National Research Council. Division on Engineering and
Physical Sciences, Committee on the Effects of Nuclear Earth-Penetrator and Other
Weapons, (Washington: National Academies Press, 2005) (prepublication copy), pp. 9-2,
9-3.
4 “B61-11 Enters the Stockpile,” Weapons Insider: A Publication of the Nuclear Weapons
Program, Los Alamos National Laboratory, Sept./Oct. 2001, p. 2.
5 Bryan Fearey, Paul White, John St. Ledger, and John Immele, “An Analysis of Reduced
Collateral Damage Nuclear Weapons,” Comparative Strategy, Oct./Nov. 2003, p. 312.

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bombs to an earth penetrator configuration. The B61 had also been under
consideration. While the Air Force is leading the study, the National Nuclear
Security Administration (NNSA) — a semiautonomous agency in the Department of
Energy (DOE) responsible for nuclear warheads — is in charge of studying
modifications of specific warheads.
RNEP is controversial. Supporters argue that it is needed to attack hard and
deeply buried targets (such as leadership bunkers or WMD production facilities) in
countries of concern, thereby deterring or defeating challenges from such nations;
critics assert that RNEP would lower the threshold for use of nuclear weapons and
prompt other nations to develop nuclear weapons to deter U.S. attack. Secretary of
Defense Donald Rumsfeld said in May 2003 that RNEP “is a study. It is nothing
more and nothing less.”6 The plan was that the RNEP study would cost $15 million
a year for FY2003-FY2005. While Congress appropriated the FY2003 request of
$15.0 million, the FY2004 request met much criticism. The House rejected an
amendment by Representative Tauscher to transfer funds from RNEP to conventional
means of attacking buried targets. The Senate tabled an amendment by Senator
Dorgan and another by Senator Feinstein to bar funds for RNEP, and adopted an
amendment by Senator Nelson (FL), and a similar amendment by Senator Reed, to
require congressional authorization to start development engineering (discussed
below) or later phases of RNEP. (The Nelson amendment became Section 3117 of
P.L. 108-136, the FY2004 National Defense Authorization Act.) Congress reduced
the FY2004 appropriation to $7.5 million.
In response to this reduction, NNSA planned to spend almost all of the $7.5
million to study the B83 as an RNEP candidate, and little on the B61 study.7 The
B83 study was being conducted by Lawrence Livermore National Laboratory, in
Livermore, CA, and Sandia National Laboratories’ Livermore branch; the B61 study
was the responsibility of Los Alamos National Laboratory, Los Alamos, NM, and
Sandia National Laboratories’ headquarters facility in Albuquerque, NM.
The RNEP FY2005 Budget and Plan,
and NNSA’s Explanation
Congress required NNSA — and DOE before NNSA was created — to provide
a five-year budget projection (current year plus four out-years) in the National
Defense Authorization Acts for FY1997 (P.L. 104-201, Sec. 3155), FY2000 (P.L.
106-65, Sec. 3253), and FY2001 (P.L. 106-398, Sec. 3154 and 3155). The FY2005
budget cycle was the first in which NNSA presented detailed out-year projection with
the current request. In the FY2005 request, the projected figures for RNEP were:
FY2005 (request), $27.6 million; FY2006, $95.0 million; FY2007, $145.4 million;
FY2008, $128.4 million; and FY2009, $88.4 million, for a five-year total of $484.7
6 U.S. Department of Defense, “DoD News Briefing — Secretary Rumsfeld and Gen.
Myers,” May 20, 2003. At [http://www.defenselink.mil/transcripts/2003/tr20030520
-secdef0207.html].
7 Information provided by NNSA staff, Feb. 10, 2004.

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million.8 The FY2005 request also presented a plan for RNEP. All figures for
FY2005-FY2009 are subject to congressional approval, rejection, or modification.
With the FY2005 request, the research program for FY2003-FY2009 was
estimated to cost $498.3 million — $6.1 million spent for FY2003, $7.5 million
appropriated for FY2004, and $484.7 million, as noted, for FY2005-FY2009. If
RNEP proceeds through development and production, additional costs would include
the cost to complete production engineering and the cost to manufacture components
to convert the selected weapon into an earth penetrator. Further, there would be a
division of labor between NNSA and the Air Force, with NNSA responsible for the
penetrator case and the Air Force responsible for the guidance unit (tail assembly,
guidance computer, etc.) The foregoing figures exclude Air Force costs. Because
NNSA has not completed its cost study, NNSA cannot provide an estimate of the
total program cost at this time.
By way of background, the Departments of Defense and Energy agreed years
ago to a formal set of phases by which modified nuclear weapons move through
research, development, production, deployment, and retirement, often called the
Phase 6.X process. The key phases for RNEP are: Phase 6.2, feasibility study and
option down select; Phase 6.2A, design definition and cost study; Phase 6.3,
development engineering, in which the nuclear weapons laboratories produce a
completed warhead design; and Phase 6.4, production engineering, in which the
design is adapted for production and a system to manufacture the weapon is created.
In its FY2005 request, NNSA stated the performance targets for RNEP as follows:
! FY2005: “Complete 56% of scheduled RNEP Phase 6.2/6.2A
activity.” Further, “In FY2005, subsystem tests and a full system
test of the proposed design will be completed.”
! FY2006: “Complete 100% of scheduled RNEP Phase 6.2/6.2A
activity.”
! FY2007: “Report results of RNEP Phase 6.2/6.2A to Nuclear
Weapons Council [a joint Department of Defense (DOD)-DOE
agency that coordinates nuclear weapon programs] Obtain, if
applicable, RNEP Phase 6.3 appropriate authorization. Complete
initial 25% of scheduled RNEP Phase 6.3 activity (if authorized).”
! FY2008: “Complete 65% of RNEP Phase 6.3 activity (if
appropriately authorized).”
8 U.S. Department of Energy, Office of Management, Budget, and Administration/CFO,
FY 2005 Congressional Budget Request, vol. 1, National Nuclear Security Administration,
DOE/ME-0032, Feb. 2004, p. 63. The RNEP budget is available under “Directed Stockpile
Work” at [http://www.mbe.doe.gov/budget/05budget/index.htm].

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! FY2009: “Complete 100% of scheduled RNEP Phase 6.3 activity
(if authorized). Complete 15% of scheduled RNEP Phase 6.4
activity (if appropriately authorized).”9
The FY2005 request therefore seemed to cast serious doubt on assertions that
RNEP is only a study. However, NNSA Administrator Linton Brooks stated:
We included funds in our out-year budget projections to comply with legislative
requirements for five-year budget projections. The out-year projections are
placeholders in the event the President decides to proceed with development and
Congress approves. No decision will be made until the study is completed. The
law is clear that beginning 6.3 engineering development requires Congressional
approval.10
The legislation that he referred to is P.L. 108-136, FY2004 National Defense
Authorization Act, Section 3117, which states:
The Secretary of Energy may not commence the engineering development phase
(phase 6.3) of the nuclear weapons development process, or any subsequent
phase, of a Robust Nuclear Earth Penetrator weapon unless specifically
authorized by Congress.
An NNSA manager responsible for the program stated that, if out-year funds
were not included in the FY2005 budget, NNSA would have faced two choices that
it deemed unsatisfactory: (1) By the time the budget for one fiscal year is submitted,
the budget for the next fiscal year is largely fixed; without the placeholder, a decision
to proceed with RNEP could not have been implemented until the second fiscal year.
(2) Alternatively, without the placeholder, a decision to proceed with RNEP could
have been implemented promptly only by taking the needed funds out of other
programs. The budget projection reflects costs that might be expected if RNEP were
to proceed to Phases 6.3 and 6.4. The manager emphasized that no decision had
been made on whether or not to proceed with those phases pending completion of the
Phase 6.2/6.2A study.11
The RNEP study was initially projected to cost $45 million — $15 million a
year for FY2003-FY2005. The numbers, however, have changed for each year. For
FY2003, delay in submission of a DOD study required by the FY2003 National
Defense Authorization Act (P.L. 107-314, Sec. 3146) delayed the start of NNSA’s
RNEP study, so $6.1 million was spent of the $15.0 million appropriated. For
FY2004, Congress cut the appropriation to $7.5 million. For FY2005, the request
was $27.6 million, and the appropriation zero, vs. $15.0 million originally planned.
9 Department of Energy, FY 2005 Congressional Budget Request, vol. 1, pp. 69, 70, 76.
10 Letter from Linton F. Brooks, Administrator, NNSA, to Honorable Ellen O. Tauscher,
Mar. 17, 2004.
11 Telephone interview, Feb. 10, 2004.

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Criticisms, Questions, and Responses
Critics reacted to the RNEP budget projection and plan. Representative
Tauscher, in a letter to NNSA Administrator Linton Brooks, stated that “This is the
first notice that we have received of a significantly ramped up activity,” and that “the
planning and budgeting for further steps in the 6.X process in the next five years
speaks to a clear intent to develop these modified nuclear weapons at a time when the
feasibility study has not been completed and the Department of Defense has not
submitted a request for this weapon.”12 Steven Aftergood of the Federation of
American Scientists argued that there are not five-year budgets for every research
program that might lead to development. He reportedly said, “If they had
placeholders for every funding scenario, they’d have to request an infinite amount of
money .... This is an expression of intent to move ahead with an expanded
program.”13 Another critic, Jay Coghlan, director of Nuclear Watch of New Mexico,
was quoted as saying, “The present administration is definitely seeking to expand
U.S. nuclear capabilities — while at the same time it denounces any kind of effort by
others to do the same.”14
Programmatic Questions
The following paragraphs present questions from Representative Tauscher’s
letter, responses from Administrator Brooks,15 and additional information based on
discussions with staff from NNSA, Los Alamos National Laboratory, and Lawrence
Livermore National Laboratory. Representative Tauscher wrote:
For FY 2005 the budget request describes the RNEP activities as including
“subsystems tests and full system test of the proposed design.” Such activities
appear to go beyond research activities and may be interpreted to fall into 6.3
activities. In your view, why are such activities consistent with legislation
passed by Congress last year? What specific activities would be associated with
the initial year of 6.3 work on the RNEP in FY 2007?
Administrator Brooks responded:
The “subsystem and full system tests of the proposed design” refer to impact
tests to be performed on surrogate penetrator bodies at Sandia National
Laboratories’ sled track facility. These tests are consistent with the definition
and requirements for a Phase 6.2 feasibility study. We need to understand
whether the penetrator bodies are survivable to ground penetration in the
required geologies before feasibility can be assessed.
12 Letter from Representative Ellen Tauscher to Linton Brooks, Administrator, National
Nuclear Security Administration, Mar. 8, 2004.
13 Paul Richter, “Questions Raised about Bomb Plan,” Los Angeles Times, Mar. 11, 2004,
p. 12.
14 Jeff Tollefson, Santa Fe New Mexican.com, Mar. 11, 2004.
15 Letter from Linton F. Brooks, Administrator, NNSA, to Honorable Ellen O. Tauscher,
Mar. 17, 2004.

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The context of this question is that the FY2004 National Defense Authorization
Act, P.L. 108-136, section 3117, requires specific congressional authorization before
starting Phase 6.3 or subsequent phases of RNEP. NNSA indicated that one type of
physical test (as distinct from a computer simulation) is planned as part of the
6.2/6.2A study: a series of “sled track tests” at Sandia National Laboratories. Some
would be done as full system tests, in which the various components of an RNEP
would be assembled in a penetrator body (a strong, heavy, pointed metal case)
without a guidance system or fissile materials.16 This assembly would be mounted
on a sled that is sent down a track at high speed and slammed into a large concrete
block to test how well the components withstand the deceleration required of an earth
penetrator weapon. This type of test is included in the 6.2/6.2A study because NNSA
deems it essential to assess feasibility. In turn, a successful demonstration of
feasibility is a necessary condition for the weapon to proceed to Phase 6.3. In
preparation for the full system tests, a number of subsystem sled tests will be
conducted, in which candidate RNEP components are slammed into a water target.
These tests are scheduled to start in the third quarter of FY2005, and will be held at
Sandia’s sled track, located at Kirtland Air Force Base in Albuquerque, NM.
More advanced tests would be conducted in Phase 6.3. In one type, “vibration
flyaround tests,” a mock-up of the weapon would be mounted on an aircraft and
flown to validate that the weapon would not be damaged by the vibration of the
aircraft and to determine the weapon’s aerodynamic stability. In this test, the device
would not be released. Another type of test, which would occur later in the
development process once the guidance system was developed, would involve
dropping a mock-up of the weapon from an aircraft. Both types of test would use
surrogate material (a heavy metal) instead of fissile materials. Other tests would
probably be conducted as well.
Representative Tauscher also asked:
With regard to the Annual Performance Results and Targets, what technical,
military, and other criteria would the NNSA consider and what decisions would
be made before it requests legislative authorization to begin 6.3 work? Who is
involved in the determination to begin 6.3 work and why does the budget indicate
that this might happen in FY 2007? Similarly, what criteria would the NNSA use
to base its decision to go from phase 6.3 to 6.4 in FY 2009?
Administrator Brooks replied:
The National Nuclear Security Administration (NNSA) does not make the
decision to proceed to Phase 6.3 or subsequent phases. If NNSA and the Air
Force agree that the Phase 6.2/6.2A study results support proceeding to Phase 6.3
engineering development, the Nuclear Weapons Council (NWC) could consider
whether to proceed further. If the NWC recommends going forward, NNSA
would move beyond the study stage only if the President approves and funds are
authorized and appropriated by the Congress.
16 Information provided March 11-12, 2004.

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He further stated that the criteria NWC would use in this decision include “the
feasibility and military utility of the design definition, and the projected cost and
schedule established in the Phase 6.2/6.2A Study,” and that “If RNEP does proceed
to 6.3, the President and Congress will make a separate decision on whether to
proceed to Phase 6.4, Production Engineering.”
To support a decision to move RNEP to Phase 6.3, NNSA would address cost,
schedule, and feasibility, while the Air Force would address military requirements.
As a hypothetical example, NNSA might say that an RNEP would have a specified
cost, could be ready by a certain date, and would have certain characteristics (weight,
accuracy, depth of penetration, etc.) The Air Force might decide not to proceed if the
penetration ability was too low or if a nonnuclear alternative existed, or it might
recommend proceeding if the proposed RNEP was the only way to accomplish what
it considered a critical military mission. The decision to request congressional
approval would be worked through the Nuclear Weapons Council and ultimately be
made by the President. The decision on whether or not to proceed with Phase 6.3 is
projected to occur in FY2007 because the Phase 6.2/6.2A study is expected to
conclude late in FY2006.
RNEP Budget and Need for Congressional Approval
For many Members, the five-year cost of RNEP as presented in the FY2005
budget document came as a surprise not only in the amount, but also in what
appeared to be an intent contrary to legislation barring Phase 6.3 or greater work on
RNEP without congressional authorization. Senator Domenici said:
I was surprised to see that the request — that nearly $500 million is provided for
the Robust Nuclear Earth Penetrator in the out year funding. ... The department
[DOE] should not assume such large sums in its budget without congressional
approval or direction. ... I want it explained to this committee unequivocally what
we are doing and what we are authorizing, and what we are not doing and what
we are not authorizing, because nobody on this committee is voting to do this.
We’re voting to study it if it wins, but not to do it. To study it is a small amount
of money. To do it is a lot of money.17
Senator Reid said to NNSA Administrator Linton Brooks:
I am a little concerned, maybe even put off by the notion that you’ve included a
half a billion dollars in your out year spending plan as what you call a place
holder for bunker busting, pending White House and congressional decisions.
I’m not sure that we can allow this to go forward. This is a large place holder.
Many remain unconvinced that this is an appropriate path.18
Senator Kennedy said to Secretary of Energy Spencer Abraham:
17 U.S. Congress, Senate Committee on Appropriations, Subcommittee on Energy and Water
Development, FY2005 Budget of the National Nuclear Security Administration, hearing,
Mar. 23, 2004, p. 2. Transcript by Federal News Service, Inc.
18 Ibid., p. 5.

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... you’re rushing ahead with the nuclear weapons, including the mini-nukes and
the nuclear bunker busters. I’ll give you a chance to be able to explain how this
program, which was $45 million two years ago is now up to almost $.5 billion.
... Why are we going ahead and are going to be requesting $.5 billion from
Congress on new nuclear weapons, the bunker buster?19
In a colloquy, Senator Warner expressed his concern on the RNEP budget and
Secretary Abraham offered an explanation:
Senator Warner: Let’s talk about the Robust Nuclear Earth Penetrator. And I
was looking at the out years, and particularly 2006, looking at a fairly substantial
increase. And I bring to your attention the fact ... in 2004, the Department of
Energy — we put in the legislation — may not proceed to the engineering
development phase three or to subsequent phases without a specific authorization
from Congress. And can you correlate that substantial ‘06 bump up with this
statutory provision, which I hope will remain?
Secretary Abraham: The statutory provision, Mr. Chairman, would, of course,
govern any decision to move from a stage of research or preliminary inquiry to
the engineering phase. We are required to provide five-year budgets, however,
so that people can look down the road and make a proper sort of assessment of
what potential expenses will be.20
Is There a Military Requirement for RNEP?
Another concern is that there is no military requirement for RNEP.
Senator Reed: ... Is there a specific military requirement for the RNEP today?
Secretary Abraham: It was the conclusion of the Nuclear Posture Review that a
threat that needed to be addressed in the 21st century in the immediate period
ahead of us would be hard, deeply buried targets. A number of approaches to
dealing with that were then asked to be researched. This is just one of them. It’s
a threat that rose to the level of being included in that review.
Senator Reed: There’s no doubt about the threat. But it’s your opinion that the
position of the administration is there is a specific military requirement for the
RNEP, not for a device to counter deeply buried targets, but for the RNEP? Is
that your position?
Secretary Abraham: No. The position of the administration is that we should
inquire about or that we should make inquiries and investigate a variety of
approaches to dealing with the hard, deeply buried target. Whether or not this
approach is feasible is the first question. And the second is whether or not it’s
19 U.S. Congress, Senate Committee on Armed Services, FY2005 Department of Energy
Defense-related Activities Budget Request, hearing, Mar. 23, 2004, p. 15. Transcript by
Federal News Service, Inc.
20 Ibid., p. 8.

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preferable to other approaches that would involve conventional weapons. And
we have not completed the first phase of that inquiry, let alone the second.21
NNSA has stated that “requirement” has been used in two senses.22 Before
DOD or NNSA start a concept study, there is a perceived need for a capability. This
type of need used to be called a “requirement,” but DOD now uses the term “desired
capabilities and characteristics.” In the case of RNEP, this perceived need has
reportedly been documented in classified form. An unclassified document dealt more
generally with defeat of hard and deeply buried targets.23 “Requirement” is also used
for a specific weapon as applied to the acquisition process. According to NNSA,
DOD “will not have an acquisition requirement before there is a well defined system
or component for them to acquire. In the nuclear weapon life cycle, that will not
occur until the completion of the Phase 2A/6.2A study.”
Legislative Activity on RNEP, FY2005
The two defense authorization bills — H.R. 4200, as reported from the House
Armed Services Committee, and S. 2400, as reported from the Senate Armed
Services Committee — both contained the full amount requested for RNEP, $27.6
million. The House Armed Services Committee “strongly reaffirms the importance”
of the RNEP Phase 6.2/6.2A study. It further stated,
The committee also takes note that a recent Defense Science Board Task Force
study on Future Strategic Strike Forces specifically recommended that research
be initiated on nuclear weapons that produce much lower collateral damage than
those weapons in the existing nuclear stockpile. The committee also reminds the
NNSA that any efforts beyond a study could only be pursued if the President
approves and funds are authorized and appropriated by Congress.24
Representatives Tauscher, Markey, Skelton, Dicks, Allen, and Spratt offered an
amendment on RNEP and other topics to H.R. 4200. It was defeated, 204-214, on
May 20 (roll no. 203). The text of the amendment is as follows:
Additional amounts for ordnance technology and for strategic capability
modernization.
1. (a) Air Force Conventional Munitions- The amount in section 201(3) for
research, development, test, and evaluation for the Air Force is hereby increased
by $25,000,000, of which —
21 Ibid., p. 18.
22 NNSA provided the information in this paragraph on Apr. 1, 2004.
23 U.S. Departments of Defense and Energy, Report to Congress on the Defeat of Hard and
Deeply Buried Targets, Submitted by the Secretary of Defense in Conjunction with the
Secretary of Energy in Response to Section 1044 of the Floyd D. Spence National Defense
Authorization Act for FY2001, P.L. 106-398, July 2001.
24 U.S. Congress, House Committee on Armed Services, National Defense Authorization Act
for FY2005, 108th Cong., 2nd sess., H.Rept. 108-491 (Washington: GPO, 2004) p. 431.

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CRS-11
(1) $10,000,000 is to be available in program element 0602602F, Conventional
Munitions, for ordnance technology applicable to defeat of weapons of mass
destruction and hardened, deeply buried targets; and
(2) $15,000,000 is to be available in program element 0603601F, Conventional
Weapons Technology, for ordnance technology applicable to defeat of weapons
of mass destruction and hardened, deeply buried targets.
(b) Defense-wide Strategic Capability Modernization- The amount in section
201(4) for research, development, test, and evaluation, Defense-wide, is hereby
increased by $11,557,000, to be available for program element 0603910D8Z,
Strategic Capability Modernization.
(c) Offset- The amount in section 3101(a)(1) for weapons activities is hereby
reduced by $36,557,000, of which —
(1) $27,557,000 is to be derived from the Stockpile Services Robust Nuclear
Earth Penetrator study; and
(2) $9,000,000 is to be derived from the Stockpile Services Advanced Concepts
program.
(The Advanced Concepts Initiative funds R&D, prior to development
engineering, of “laboratory workload activities to potentially enhance the military
capabilities of the stockpile, in coordination with the DoD.”25 See CRS Report
RL32130, Nuclear Weapon Initiatives: Low-Yield R&D, Advanced Concepts, Earth
Penetrators, Test Readiness.)
Senators Kennedy and Feinstein introduced amendment no. 3263 to S. 2400, the
FY2005 defense authorization bill, to bar the use of FY2005 funds for RNEP or the
Advanced Concepts Initiative. The Senate debated the amendment on June 3 and 15,
and rejected it on the latter date, 55-42.
Senator Bennett submitted the following amendment 3403 to S. 2400 on June
7. He withdrew it on June 23.
At the end of subtitle B of title XXXI, add the following:
Sec. 3122. Requirement of specific authorization of Congress for full-scale
underground nuclear test of robust nuclear earth penetrator.
Section 3117 of the National Defense Authorization Act for Fiscal Year 2004
(Public Law 108-136; 117 Stat. 1746) is amended by inserting ``, or conduct a
full-scale underground nuclear test of such weapon,’‘ after ``Robust Nuclear
Earth Penetrator weapon’‘.
For reference, Section 3117 of P.L. 108-136 is as follows:
25 Department of Energy, FY 2005 Congressional Budget Request, vol. 1, p. 76.

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CRS-12
Sec. 3117. Requirement for specific authorization of Congress for
commencement of engineering development phase or subsequent phase of robust
nuclear earth penetrator.
The Secretary of Energy may not commence the engineering development phase
(phase 6.3) of the nuclear weapons development process, or any subsequent
phase, of a Robust Nuclear Earth Penetrator weapon unless specifically
authorized by Congress.
On June 9, the Energy and Water Development Subcommittee of the House
Appropriations Committee approved the FY2005 energy and water development
appropriations bill by voice vote. The measure provided no funds for RNEP.26 The
full committee approved the bill by voice vote on June 16. The committee bill
provided no funds for RNEP. The committee explained its position on RNEP and
ACI as follows:
The Committee continues to oppose the diversion of resources and intellectual
capital away from the most serious issues that confront the management of the
nation’s nuclear deterrent. ... the Committee remains unconvinced by the
Department [of Energy]’s superficial assurance that the RNEP activity is only a
study and that advanced concepts is only a skills exercise for weapons designers.
The Committee notes that the management direction for fiscal year 2004 sent to
the directors of the weapons design laboratories left little doubt that the objective
of the program was to advance the most extreme new nuclear weapon goals
irrespective of any reservations expressed by Congress. ... the Committee’s
priorities are maintaining our Nation’s nuclear deterrent in a safe and secure
condition and maintaining our Nation’s integrity in the international effort to halt
the proliferation of weapons of mass destruction. The Department’s obsession
with launching a new round of nuclear weapons development runs counter to
those priorities. The Committee directs the NNSA to focus wholly on its primary
mission of maintaining the safety, security, and viability of the existing stockpile
...”27
On June 25, the House considered the bill, H.R. 4614, and passed it, as
amended, 370-16. No amendments were offered to the Weapons Activities section.
In the Senate, the energy and water bill was held up by disputes over the Yucca
Mountain (NV) civilian nuclear waste repository.28 The Energy and Water
Development Appropriations Subcommittee did not report a bill to the full
26 Statement of Chairman Dave Hobson, in U.S. Congress, House Committee on
Appropriations, FY2005 Energy and Water Development Appropriations Bill, June 9, 2004.
[http://appropriations.house.gov/index.cfm?FuseAction=PressReleases.Detail&
PressRelease_id=383].
27 U.S. Congress, House Committee on Appropriations, Energy and Water Development
Appropriations Bill, 2005 H.Rept. 108-554, 108th Cong., 2nd sess., June 2004 (Washington,
GPO, 2004), p. 115.
28 For details on Yucca Mountain, see CRS Issue Brief IB92059, Civilian Nuclear Waste
Disposal, by Mark Holt. Regarding the legislative process on the energy and water bill, see
Amol Sharma, “Energy and Water Appropriations: The Battle for Yucca Mountain, CQ
Weekly, Nov. 27, 2004, p. 2787.

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CRS-13
committee. For a time, it appeared that it would not be possible to include energy
and water appropriations in the omnibus appropriations bill, and that FY2005
spending for energy and water would be done under a year-long continuing
resolution.29 However, a compromise worked out at the last minute permitted
inclusion of energy and water appropriations in H.R. 4818, Consolidated
Appropriations Act, 2005.30
Piecing together numerous press reports, the arrangement that broke the logjam
included several elements. (1) RNEP and ACI were eliminated, and several other
nuclear weapons programs were eliminated, reduced, or modified. (2) Conferees
freed up $800 million from various parts of the omnibus bill, some of which was
used to provide $577 million for Yucca Mountain instead of the $131 million in the
House bill. (3) Conferees provided substantial increases for three projects at Los
Alamos and Sandia National Laboratories.31 According to one report, “In return for
letting Hobson cut the bunker-buster and other new nuclear weapons initiatives,
Domenici got money he wanted for work at Sandia and Los Alamos, Domenici
acknowledged in an interview.”32 Another report stated: “Sen. Pete Domenici (R-
NM), one of the chief backers of RNEP and ACI funding in Congress, told reporters
this week that he agreed to the spending cuts for both programs in order to get the
omnibus bill finished.”33
Developments in the FY2006 Cycle
The FY2006 RNEP request
For FY2006, NNSA cast a program more modest in its cost, scope, and schedule
than was the case for FY2005. Rather than show a five-year projection, NNSA,
recognizing that a separate decision would be needed to go beyond the study phase,
projected a cost for the study only, ending in FY2007, and reduced the scope of the
study from the B83 and B61 to the B83 only. As a result, the cost was much lower.
As Ambassador Brooks explained,
The reason the level is so much less is we have cut back on what it is that we
propose to do. Originally, we proposed to examine two different warheads.
Fundamentally, what we’re doing is taking a warhead, putting a very hard case
29 Joseph Schatz, “Thorny Issues, Multibillion-Dollar Gap Divide Chambers’ Fiscal
Spending Bills,” CQ Today, Oct. 22, 2004.
30 For text of this measure, see U.S. Congress. Congressional Record, Nov. 19, 2004, Book
II (entire volume). For text of Weapons Activities, see ibid., pp. H10273-H10274, H10556-
H10557, and H10566-H10569.
31 Amol Sharma, “Energy and Water Appropriations: The Battle for Yucca Mountain,” CQ
Weekly, Nov. 27, 2004, p. 2787.
32 John Fleck, “Nuclear Weapons Budget Grows Despite Cuts to Bomb Modernization
Plans,” Albuquerque Journal, Nov. 23, 2004.
33 Keith Costa, “Lawmakers Scuttle FY-05 Funding for Nuclear ‘Bunker Busters,’” Inside
the Pentagon, Nov. 25, 2004.

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CRS-14
on it, controlling its attitude very precisely, so that it can penetrate a few meters
into rock and still stay intact and go off, that way the energy goes into the
ground. We’ve concluded that we can demonstrate whether or not the concept
is feasible by looking at only one warhead. We selected the B83, which is one
of the two bombs we were looking at, because that was where we were when the
program was stopped.34
For FY2006, NNSA requests $4.0 million for the RNEP study. NNSA states:
The Robust Nuclear Earth Penetrator (RNEP) category includes funding for the
Phase 6.2/2A Air Force-led study. The decision to complete this study was
reaffirmed with DoD in January 2005. Activities include participating in
integrated NNSA-DoD integrated product teams for development of RNEP
requirements and programmatic documents; system design and integration;
planning, cost and risks analyses; and phenomenology studies. The study is
scheduled for completion in FY 2007. In FY 2006, activities include conduct of
a B83 impact test, analyzing test data, and supporting integration meetings with
the DoD.35
The Senate Armed Services Committee stated that the funding is “to prepare and
execute the sled track impact test at Sandia National Laboratories on the feasibility
of case hardening and target penetration.”36
DOD also requests FY2006 funds for RNEP, included in the Air Force budget.
According to an Air Force legislative liaison officer:
The Air Force will spend $4.5M in FY 2006 and $3.5M in FY 2007 to complete
the joint study that began in FY 2003. As part of the joint study in these years,
the Air Force will perform analysis and specify requirements for integrating the
conceptual weapon on the B-2 platform (e.g., software and hardware
modifications), identify environments the weapon would have to withstand (e.g.,
temperature, acceleration, and shock and vibration), and define capabilities
needed for the navigation, guidance and control (NG&C) — (e.g., accuracy and
impact parameters). We will also develop estimates of the associated costs.37
34 Testimony of Ambassador Linton Brooks, Administrator, National Nuclear Security
Administration, in U.S. Congress, Senate Committee on Armed Services. Subcommittee on
Strategic Forces, Strategic Forces/Nuclear Weapons Fiscal Year 2006 Budget, hearing, Apr.
4, 2005.
35 U.S. Department of Energy, Office of Management, Budget and Evaluation/CFO, FY 2006
Congressional Budget Request, vol. 1, National Nuclear Security Administration,
DOE/ME/0046, Feb. 2005, pp. 82-83.
36 U.S. Congress, Senate Committee on Armed Services, National Defense Authorization Act
for Fiscal Year 2006, S.Rept. 109-69, to accompany S. 1042, 109th Cong., 1st Sess., 2005,
pp. 202, 482.
37 E-mail from Lt. Col. Joseph Cappello, USAF, to Jonathan Medalia, Feb. 16, 2005. The
funds are contained in the FY2006 Air Force Research, Development, Test, and Evaluation
Program under Advanced Component Development and Prototypes as a part of Program
Element 0604222F, “Nuclear Weapons Support.”

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An Air Force document provides further details on the FY2006 DOD RNEP
request. The document states that Nuclear Weapons Support
Supports pre-acquisition studies/analyses to determine feasibility and develop
definition, and cost of navigation, guidance, and control (NG&C) concepts as
well as evaluate B-2 aircraft integration issues associated with the joint
Department of Defense (DoD) and Department of Energy (DOE) Robust Nuclear
Earth Penetrator (RNEP) concept as approved/directed by the Nuclear Weapons
Council (NWC).
FY 2006 funding is a combination of $1.0M in RDT&E-AF [research,
development, test, and evaluation, Air Force] and $3.5M in O&M-AF [operation
and maintenance, Air Force] funding. The RDT&E-AF funding will complete
logistics and aircraft integration planning as well as develop nuclear certification
criteria. The O&M funding will support the development of a conceptual NG&C
design and risk assessment, identification of B-2 software/hardware issues, and
other related B-2 logistics and integration efforts. (FY 2005 Base $0)38
The $1.0 million is included in $15.4 million for program element 0604222F,
“Nuclear Weapons Support,” within RDT&E, Air Force.39 The $3.5 million is
included in $287.2 million for program element 3400F, line 020, “Primary Combat
Weapons,” within O&M, Air Force.40
The out-year NNSA budget projection for RNEP is $14.0 for FY2007.41 At that
point, the study is expected to be complete and no further funds are projected for the
RNEP study. NNSA explained the change from the FY2005-FY2009 budget request
and projection, which included a total of $484.7 million for those years, by stating
that the out-year line in the FY2006 request document makes clear that these funds
are requested for a study only, and that a subsequent decision to proceed with
development of the weapon would be a separate issue with a separate budget line.
Another decision made in the FY2006 request was to analyze only one weapon for
38 U.S. Department of the Air Force. Fiscal Year (FY) 2006/FY2007 Budget Estimates:
Operation and Maintenance, Air Force, Volume I, Feb. 2005, p. 87. Available at
[https://www.saffm.hq.af.mil/FMB/pb/2006/afoandm/AF_FY06_PB_OM_Vol%201.pdf].
39 U.S. Department of Defense, Office of Under Secretary of Defense (Comptroller).
RDT&E Programs (R-1), Fiscal Year 2006, Feb. 2005, p. F-5, [http://www.dod.mil/
comptroller/defbudget/fy2006/fy2006_r1.pdf].
40 U.S. Department of Defense, Office of Under Secretary of Defense (Comptroller).
Operations Programs (O-1), Fiscal Year 2006, Feb. 2005, p. 10, [http://www.dod.mil/
comptroller/defbudget/fy2006/fy2006_o1.pdf].
41 Department of Energy, FY 2006 Congressional Budget Request, vol. 1, p. 68.

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CRS-16
conversion to RNEP, rather than two as in previous years.42 That weapon is the B83
bomb,43 with the B61 bomb dropped from consideration.
A question that arose in 2004 was if DOD supported RNEP. In 2005, DOD
answered affirmatively. NNSA Administrator Linton Brooks testified in April 2005,
After last year’s action by the Congress [on RNEP], we asked the Department of
Defense to review the continuing need. The Secretary of Defense personally
reviewed that, and at his direct personal request we have included the money in
the budget for this year. He did this not because he’s particularly interested in
developing a new weapon, but because there are adversaries who are building
deeply buried facilities, and it is unwise for there to be anything that’s beyond
the reach of U.S. power.44
According to a press report, Secretary of Defense Donald Rumsfeld wrote a memo
in January 2005 to then-Secretary of Energy Spencer Abraham that stated “‘I think
we should request funds in FY06 and FY07 to complete the [RNEP] study. ... You
can count on my support for your efforts to revitalize the nuclear weapons
infrastructure and to complete the RNEP study.’”45
There was also a suggestion that DOD’s request was crucial to DOE’s decision
to include RNEP in the FY2006 budget. According to a press report, “‘The reason
the money was put in the budget was the result of a direct request from [the Defense
Department] to finish the study,’ said Anson Franklin, a spokesman for the Energy
Department’s National Nuclear Security Administration. ‘The Secretary of Defense
was consulted, and based on that information we put it back in the budget.’”46
Legislative Activity
The House Appropriations Committee recommended eliminating NNSA funds
for RNEP from the Energy and Water Development Bill, H.R. 2419, as it did in the
FY2005 bill. The report stated,
The Committee continues to oppose the diversion of resources and intellectual
capital away from the more serious issues that confront the management ofthe
nation’s nuclear deterrent, primarily the transformation of the Cold War nuclear
42 Testimony of Ambassador Linton Brooks, Administrator NNSA, in U.S. Congress, House
Committee on Armed Services. Subcommittee on Strategic Forces, FY2006 Budget Request
for Atomic Energy Defense Activities, Mar. 2, 2005. Transcript by Federal News Service,
p. 4.
43 Department of Energy, FY 2006 Congressional Budget Request, vol. 1, p. 83.
44 U.S. Congress, Senate Committee on Appropriations, Subcommittee on Energy and Water
Development, FY2006 Appropriations for the National Nuclear Security Administration,
hearing, Apr. 14, 2005.
45 Walter Pincus, “Rumsfeld Seeks to Revive Burrowing Nuclear Bomb,” Washington Post,
Feb. 1, 2005, p. 2.
46 Bill Gertz, “Defense Seeks Raise, Rock-Penetrating Nuke,” Washington Times, online
edition, February 8, 2005.

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CRS-17
weapons complex and existing stockpile into a sustainable enterprise. The
Committee has been disappointed at the bureaucracy’s adherence to an initiative
that threatens Congressional and public support for sustainable stockpile
initiatives that will actually provide long-term security and deterrent value for the
Nation.47
The House passed the bill, 416-13, on May 24, with no amendments on RNEP, and
only a few brief mentions of it in prepared remarks. (Note that the bill did not
address the Air Force RNEP request, which fell under the jurisdiction of the DOD
Appropriations Subcommittee.)
The House Armed Services Committee recommended providing the DOD
RNEP funds as requested, but transferring the $4.0 million in NNSA funds to a
separate program in DOD. In explaining the transfer, the committee’s report stated,
“Based on the applicability of the sled test results to various options for HDBT [hard
and deeply buried target] defeat, the committee believes that this [NNSA RNEP]
study is more appropriately conducted under a program element within the
Department of Defense.”48 Accordingly, “The committee authorizes $4.0 million in
PE [program element] 64327F for a penetrator test that would evaluate the feasibility
of various options for different types of penetrators that could hold HDBTs at risk.
The committee intends that this study be completed by the end of fiscal year 2006.”49
However, 23 of the 28 committee Democrats stated that the report language “could
be construed to allow the sled test to inform whether a nuclear payload could be used
in high-speed penetration of hard geologies,” and urged that the test “should be
conducted in a manner that only informs conventional payloads.”50 The House
passed the bill, H.R. 1815, 390-39, on May 25 with no amendment or debate on
RNEP. Representative Heather Wilson, in discussing the energy and water bill,
stated, “It is my understanding that this study will now move to the Department of
Defense and outside of the jurisdiction of the Energy and Water Appropriations
subcommittee.”51 It is unclear whether the move of RNEP funds from NNSA to
DOD was done with this purpose in mind.
The House Appropriations Committee’s FY2006 DOD Appropriations Bill,
H.R. 2863, contained $4.0 million for a “conventional penetrator study” as a new
program under “Hard and Deeply Buried Target Defeat System.”52 Further, it
47 U.S. Congress, House Committee on Appropriations, Energy and Water Development
Appropriations Bill, 2006, report to accompany H.R. 2419, 109th Cong., 1st Sess., H.Rept.
109-86, (Washington: GPO, 2005), p. 131.
48 U.S. Congress, House Committee on Armed Services, National Defense Authorization Act
for Fiscal Year 2006, report to accompany H.R. 1815, 109th Congress, 1st Session, H.Rept.
109- 89, (Washington: GOP, 2005), p. 463.
49 Ibid., p. 211.
50 Ibid., p. 513.
51 “Speech of Hon. Heather Wilson,” in U.S. Congress, Congressional Record, May 25,
2005, p. E1091.
52 U.S. Congress, House Committee on Appropriations, Department of Defense
(continued...)

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CRS-18
retained $4.5 million within the categories “Nuclear Weapons Support” and “Primary
Combat Weapons” that was requested for integrating RNEP with the B-2.53
Committee staff explained that the committee intends that the study be of nonnuclear
means of hard and deeply buried target defeat, and not of RNEP. As a corollary, the
staff continued, since the RNEP study is not funded but the $4.5 million is linked to
the B-2, the committee intends that the latter sum be used to study integrating
conventional earth penetrators with the B-2.54 The House passed H.R. 2863, 398-19,
on June 20, with no change to the foregoing provisions.55
The Senate Armed Services Committee reported the defense authorization bill,
S. 1042, on May 17. It recommended eliminating the $4.5 million in DOD funding
on grounds that “evaluation of RNEP feasibility by the Department of Energy is not
scheduled to be completed prior to 2007.”56 Further, “The committee does not
believe that these activities are necessary to evaluate the feasibility of RNEP.”57 The
committee recommended providing the $4.0 million that NNSA requested for
RNEP.58 The Senate began considering the bill on July 20. On July 22, the Senate
debated an amendment (SA 1415) by Senator Kennedy to transfer NNSA RNEP
funds to the Washington, DC, Army National Guard. The Senate will resume
consideration of the amendment and the bill after the August recess.
The Senate Appropriations Committee reported the energy and water bill, H.R.
2419, on June 16. The committee recommended $4.0 million for NNSA for the
RNEP study, and urged that the sled tests be conducted at Sandia National
Laboratories in Albuquerque, NM, as planned.59 On June 30, the Senate rejected, 43-
53, an amendment by Senator Feinstein to eliminate the $4.0 million from the bill.60
The Senate passed the bill, as amended, 92-3, on July 1.
52 (...continued)
Appropriations Bill, 2006, H.Rept. 109-119 to accompany H.R. 2863, 109th Cong., 1st Sess.,
2005, pp. 266, 275.
53 Ibid., pp. 65, 275.
54 Information provided by House Appropriations Committee staff, June 21 and 23, 2005.
55 For a colloquy and statement on H.R. 2863 regarding RNEP, see U.S. Congress,
Congressional Record, June 20, 2005: H4736, H4738-H4739.
56 Senate Committee on Armed Services, National Defense Authorization Act for Fiscal
Year 2006, pp. 202, 292.
57 Ibid., p. 483.
58 Ibid., p. 482.
59 U.S. Congress, Senate Committee on Armed Services, Energy and Water Appropriations
Bill, 2006, S.Rept. 109-84, to accompany H.R. 2419, 109th Cong., 1st Sess., 2005, p. 155-156.
60 For debate on the amendment, see U.S. Congress, Congressional Record. June 30, 2005:
S7781-S7794. Amendment text is on p. S7781; vote on the amendment is on p. S7794.

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Clarification of Key Points in FY2006 Hearings
Hearings in 2005 added information on topics that may arise in any future
debate, such as the yield of RNEP, the collateral damage the weapon would likely
cause, and the military requirement for RNEP. The following colloquy occurred at
a hearing in February:
Representative Terry Everett: ... Could you please tell me directly if there’s
a military need for this, for robust earth — nuclear earth penetrator?
Secretary of Defense Donald Rumsfeld: ... It is a question that’s difficult
to answer, because sometimes they say “military requirement”. And that’s a
formal process. There was no military requirement for military aircraft, for
example. There was no military requirement for unmanned aerial vehicles until
they came along. And so, what I believe, there is a need for the study — which
is what we’re talking about here, and not a weapon. We’re talking about taking
existing weapons and doing a study to see if they can be reduced in their power,
their lethality to a level that’s lower than the current weapons are so that they
might have the ability to penetrate the earth in a way that could help protect the
United States of America. I think that it is clearly in our country’s interest to do
the study. Has it — [speaking to General Richard Myers, Chairman, Joint Chiefs
of Staff] You want to comment on whether there’s a, quote, “military
requirement” specifically?
General Myers: You bet. Our combatant commander that is charged by
this nation to worry about countering the kind of targets, deeply buried targets
certainly thinks there’s a need for this study. And General Cartwright has said
such. I think that. I think the Joint Chiefs think that. And so, the study is that.
It’s not a commitment to go forward with a system, it’s just to see if it’s
feasible.61
This colloquy occurred at a hearing in March:
Representative Ellen Tauscher: I just want to know is there any way an
RNEP of any size that we would drop will not produce a huge amount of
radioactive debris?
NNSA Administrator Linton Brooks: No, there is not.
Representative Tauscher: Secretary Rumsfeld last week confused the
debate over the RNEP when he told our committee that the RNEP study, “is
taking existing weapons and doing a study to see if they can be reduced in their
power, lethality, to a level that is lower than current weapons.” My
understanding was that the RNEP study was not going to change the physics
package of the warhead but simply look at ways to repackage the device so it can
penetrate hard geologies. Am I right or are you also looking at lowering the yield
of, say, the B83 to perhaps under five kilotons?
Administrator Brooks: We are not looking at changing the yield of the
physics package. ...
Ambassador Brooks: I really must apologize for my lack of precision if we
in the administration have suggested that it was possible to have a bomb that
61 Testimony of Donald Rumsfeld, Secretary of Defense, and General Richard Myers,
Chairman, Joint Chiefs of Staff, in U.S. Congress, House Committee on Armed Services,
FY2006 Defense Budget Request, Feb. 16, 2005. Transcript by Federal News Service, pp.
30-31

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CRS-20
penetrated far enough to trap all fallout. I don’t believe that — I don’t believe
the laws of physics will ever let that be true. ...
This is a nuclear weapon. This is a nuclear weapon that is going to be
hugely destructive and destructive over a large area. No sane person would use
a weapon like that lightly, and I regret any impression that anybody, including
me, has given that would suggest that this is going to be any easier a decision —
I mean if this weapon were in the arsenal today, it would still be a hugely
difficult decision for any president to even contemplate it. So I — the
administration believes and I personally believe that this study should continue,
but it — I want to — I do want to make it clear that any thought of sort of nuclear
weapons that aren’t really destructive is just nuts.62
To summarize, the foregoing passages, by clarifying several points that were at
issue in earlier debates on RNEP, may help focus any future debate.
! There is no formal military requirement for RNEP.
! There is considerable interest by DOD and the armed services in
learning, through the proposed RNEP study, whether RNEP is
feasible.
! The possible conversion of a B83 bomb to an RNEP would not
involve changing the yield of the weapon.
! RNEP — and probably any other nuclear earth penetrator — would
not penetrate the ground deeply enough to contain fallout. Use of
RNEP would therefore cause a “huge” amount of fallout and
destruction.
! Because RNEP, if it is deployed, would be a nuclear weapon, a
presidential decision to use it would be very difficult.
62 Testimony of Ambassador Linton Brooks, House Committee on Armed Services, Mar. 2,
2005, pp. 15-16.

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