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Right after I graduated, I interned with the Arms Control Association. It was terrific.

– George Stephanopolous
Host of ABC's This Week
January 1, 2005
Peaceful Nuclear Explosions Treaty (PNET)
 

The Peaceful Nuclear Explosions Treaty (PNET), designed in preparation for the Threshold Test Ban Treaty (TTBT), governs nuclear explosions that are carried out outside test sites, as established under the Threshold Test Ban Treaty. The United States and the Soviet Union agreed to not carry out explosions exceeding 150 kilotons and group explosions unless the yield of individual explosions in the group could be verified. The Treaty does not ban against peaceful nuclear explosions in the territory of another state, but these explosions have to comply with yield limitations and be in accord with the nuclear Nonproliferation Treaty. The PNET and TTBT were established under a comprehensive system of regulations with neither state able to withdraw from the treaty until the TTBT finished its duration of five years.

Opened for Signature: 28 May 1976

Entry into force: 11 December 1990

Official Text: http://www.state.gov/t/isn/5182.htm#treaty

Status and Signatories: http://www.state.gov/t/isn/5182.htm#narrative

ACA Backgrounder: https://www.armscontrol.org/factsheets/Nuclear-Testing-and-Comprehensive-Test-Ban-Treaty-CTBT-Timeline