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January 1, 2005
The New NAS Report: The Case is Stronger Than Ever for the Test Ban Treaty
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Volume 3, Issue 5, March 30, 2012

Today, the U.S. National Academy of Sciences (NAS) released its long-awaited report on technical issues related to the Comprehensive Test Ban Treaty (CTBT). The independent panel of senior scientific and military experts was charged in 2009 with reviewing technical developments related to the U.S. nuclear stockpile and to nuclear explosion test monitoring that have occurred since the 2002 NAS report on the CTBT and the Senate's brief debate and rejection of the treaty in 1999.

The new NAS report, The Comprehensive Test Ban Treaty: Technical Issues for the United States, reaffirms that the United States no longer needs--and would not benefit from--nuclear explosive testing. Renewed nuclear testing would only help improve other nations' nuclear capabilities and reduce U.S. security. And the report documents why U.S. ratification and entry into force of the CTBT would significantly improve our ability to detect and deter nuclear testing by others.

The NAS report lays out a stronger case than ever before for supporting the CTBT:

  • The 2012 NAS report documents that significant technical advances have resolved earlier concerns about the treaty.

The panel concluded that the National Nuclear Security Administration (NNSA)'s nuclear weapons stockpile stewardship program "has been more successful than was anticipated in 1999," when the Senate last considered the CTBT. Maintaining an effective nuclear stockpile will require continued diligence, but it does not require nuclear test explosions.

"Similarly," the panel said, "the status of U.S. national monitoring and the International Monitoring System has improved to levels better than predicted in 1999."

The new study cites substantial advances in the U.S. national monitoring and the International Monitoring System capabilities across all of the key verification technologies deployed worldwide to detect and deter nuclear test explosions-seismic, hydroacoustic, infrasound, radionuclide, and satellite monitoring.

  • More is known today than ever before about the U.S. nuclear arsenal and there is no technical or military reason to resume testing.

As former NNSA administrator and NAS panel member Linton Brooks said in Dec. 2011, "as a practical matter, it is almost certain that the United States will not test again ... in recent years I never met anybody who advocated that we seek authorization to return to testing."

Similar to the 2002 NAS report, the new study finds that if sufficient resources are dedicated to the task the United States has the technical ability to maintain a safe, secure, and reliable stockpile of nuclear weapons into the foreseeable future without resuming nuclear test explosions.

The nuclear weapons labs have more resources than ever before to perform core stockpile stewardship work. Since 2009, funding for the NNSA nuclear weapons complex has increased by 13%. The Obama administration's $7.6 billion budget request for fiscal year 2013 would boost NNSA weapons programs funding even more-by 5% over last year's appropriation of $7.2 billion.

As Sen. Dianne Feinstein noted at a March 21, 2012 appropriations committee hearing, "Regarding nuclear weapons activities, I believe the fiscal year 2013 budget request provides more than sufficient funding to modernize the nuclear weapons stockpile."

  • National and international test ban monitoring and verification capabilities have improved immensely.

With the combined capabilities of the International Monitoring System (IMS), national technical means (NTM), and civilian seismic networks, no potential CTBT violator could be confident that a nuclear explosion of any military utility would escape detection.

The panel's detailed report also concludes that "[c]onstraints placed on nuclear-explosion testing by the monitoring capabilities of the IMS and ... U.S. NTM, will reduce the likelihood of successful clandestine nuclear-explosion testing, and inhibit the development of new types of strategic nuclear weapons."

The report found that "[o]ther states intent on acquiring and deploying modern, two-stage thermonuclear weapons would not be able to have confidence in their performance without multi-kiloton testing. Such tests would likely be detectable (even with evasion measures) by appropriately resourced U.S. national technical means and a completed IMS network."

The study noted that on-site inspections as allowed under the treaty once it enters into force, "would have a high likelihood of detecting evidence of a nuclear explosion with a yield greater than 0.1 kilotons, provided that the event could be located with sufficient precision ... and conducted without hindrance." The panel noted that an on-site inspection "constitutes a deterrent to treaty violation whether or not an inspection actually takes place...."

  • The security value of the CTBT is greater than ever.

U.S. ratification and entry into force of the treaty would improve our ability to detect and deter nuclear testing that could allow others to improve their arsenals.

The NAS report documents how the CTBT constrains the ability of the established nuclear-weapon states, including Russia and China, to build new types of more sophisticated nuclear warhead designs.

The report also documents why, without the option of nuclear explosive testing, newer testing nations, including potentially Iran, could not perfect sophisticated two-stage thermonuclear warheads that can be delivered on long-range ballistic missiles.

The report found that "the development of weapons with lower capabilities ... is possible with or without the CTBT for countries of different levels of nuclear sophistication, but such developments would not require the United States to return to nuclear testing in order to respond because it already has-or could produce-weapons of equal or greater capability based on its own nuclear-explosion test history."

The United States has detonated 1,030 nuclear test explosions--more than all other nations combined--the last of which was in September 1992. Russia has conducted 715 nuclear tests; China 45; North Korea 2; Iran 0.

Time for a Thorough, Thoughtful Review

The Senate has not seriously examined these issues in years. In the decade since the Senate last considered the CTBT, 59 Senators have left office; only 41 Senators who debated and voted on the CTBT in 1999 remain.

Good policy depends on good information. Senators and their staff need to take a serious look at the merits of the CTBT in light of the new NAS findings and not rush to judgment on the basis of old information, misconceptions, or partisan politics.

President Obama has repeatedly expressed his commitment to the CTBT, most recently in a March 26 speech in Seoul. But he and his team must provide stronger leadership to ensure the Senate's questions on the CTBT are fully addressed and to create the necessary climate and support for a successful vote in 2013.

The bipartisan approval of New START in 2010 shows that a successful treaty approval process requires months of hearings, answers to thousands of questions, and a serious commitment to building understanding for the national security issues at stake.

U.S. ratification of the CTBT is essential for entry into force and would very likely prompt other states, including China, India, and Pakistan, to follow suit.

The American people expect their leaders to take action to reduce the threats posed by nuclear weapons and proliferation. U.S. ratification of the CTBT would advance American national security interests by helping to reduce nuclear threats and enhancing our ability to detect, deter, and confront proliferators. --DARYL G. KIMBALL

For more information on the CTBT, see: