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Summary

A comprehensive nuclear-test-ban treaty (CTBT) is the oldest item on the nuclear arms control agenda. Three treaties currently bar all but underground tests with a maximum force equal to 150,000 tons of TNT. The Natural Resources Defense Council states the United States conducted 1,030 nuclear tests, the Soviet Union 715, the United Kingdom 45, France 210, and China 45. The last U.S. test was held in 1992; Russia claims it has not tested since 1990. In 1998, India and Pakistan announced several nuclear tests. Each declared a test moratorium; neither has signed the CTBT. North Korea conducted a nuclear test in 2006. Since 1997, the United States has held 23 "subcritical experiments" at the Nevada Test Site to study how plutonium behaves under pressures generated by explosives. It asserts these experiments do not violate the CTBT because they cannot produce a self-sustaining chain reaction. Russia reportedly held some since 1998. The U.N. General Assembly adopted the CTBT in 1996. As of January 23, 2009, 180 states had signed it; 148, including Russia, had ratified. Of the 44 that must ratify the treaty for it to enter into force, 41 had signed and 35 had ratified. Five conferences have been held to facilitate entry into force, most recently in 2007. In 1997, President Clinton sent the CTBT to the Senate. In October 1999, the Senate rejected it, 48 for, 51 against, 1 present. It is on the Senate Foreign Relations Committee's calendar. It would require a two-thirds Senate vote to send the treaty back to the President for disposal or to give advice and consent for ratification. The Obama Administration plans to seek Senate approval of the CTBT, followed by a diplomatic effort to secure ratification by the remaining states that must ratify for the treaty to enter into force. Congress addresses nuclear weapon issues in the annual National Defense Authorization Act and the Energy and Water Development Appropriations Act. It considers the Stockpile Stewardship Program (listed as Weapons Activities), which seeks to maintain nuclear weapons without testing; the FY2008 appropriation is $6.356 billion, and the FY2009 request is $6.618 billion. Congress considers a U.S. contribution to a global system to monitor possible nuclear tests. The FY2008 appropriation was $23.8 million. The FY2009 Consolidated Appropriations Act provides about $10.2 million for October 1, 2008-March 6, 2009, though the amount may vary if the State Department shifts funds within the account of which this contribution is a part. U.S. voting rights in the CTBT Organization Preparatory Commission were suspended on January 1, 2009, for not paying enough dues. This report will be updated. For a detailed presentation of pros and cons, see CRS Report RL34394, Comprehensive Nuclear-Test-Ban Treaty: Issues and Arguments, by Jonathan Medalia.

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