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Cold Shot / Cold Standby Status Updates at NNSS

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Cold Shot / Cold Standby Status Updates at NNSS

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A December 2022 status update of stockpile stewardship activities at the Nevada National Security Site. Based on oversight technical documentation, the author outlines obstacles since July '22 affecting the conduct of Subcritical Nuclear Experiments at the U1a complex.

A December 2022 status update of stockpile stewardship activities at the Nevada National Security Site. Based on oversight technical documentation, the author outlines obstacles since July '22 affecting the conduct of Subcritical Nuclear Experiments at the U1a complex.

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Cold Shot / Cold Standby Status Updates at NNSS

  1. 1. Cold Shot / Cold Standby Status Updates*: By Andrew Kishner, 209Days.com December 14, 2022 In a Defense Nuclear Facilities Safety Board (DNFSB) Oct. NNSS report, a positive USQD was determined after monsoon moisture and muck issues put a U1h hoist (cable system) for SNEs packages out of order, further delaying subcritical test operations as, per the report, facility personnel concluded the safety basis for the U1a "will need to be revised." Citing a Jul. 2022 DNFSB report discussing an unreviewed safety question relating to SNE vessels ("discrepancies between the code and the fabrication of the [steel confinement] vessel"), the Oct. report added "the U1a complex
  2. 2. continues to remain in cold standby operations." An update in a November edited report described new surveillance requirements for SNEs package moving that would be part of the hoist/muck-related safety basis while temporary restrictions were instituted for vessel use as an approved ESS for that issue indicated the vessel confinement system "will be able to perform its nuclear safety function" according to "a technical document from the national laboratories." It concluded that "MSTS plans to use this confinement vessel for the next planned experiment once the safety basis is revised and the operational restrictions are removed." Source: https://www.dnfsb.gov/documents/reports?f%
  3. 3. 5B0%5D=field_doe_site%3A57 * 'Cold shot' is a synonym of 'subcritical nuclear test' and is the preferred term -- translated in English -- of French nuclear authorities.

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