Evaluation of Cavity Collapse and Surface Crater Formation for Selected Lawrence Livermore National Laboratory Underground Nuclear Tests - 2010

Pawloski, G A

关键词: CONSTRUCTION;    CONTAINMENT;    DRILLING;    EVALUATION;    GEOLOGY;    GROUND MOTION;    LAWRENCE LIVERMORE NATIONAL LABORATORY;    NATIONAL SECURITY;    NEVADA;    POSITIONING;    RADIATIONS;    SAFETY;    SECURITY;    TESTING;    WEAPONS;    UNDERGROUND EXPLOSIONS;   

DOI  :  10.2172/1018818
RP-ID  :  LLNL-TR-464627
PID  :  OSTI ID: 1018818
Others  :  TRN: US201114%%493

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来源: SciTech Connect

【 摘 要 】

This report evaluates collapse evolution for selected Lawrence Livermore National Laboratory (LLNL) underground nuclear tests at the Nevada National Security Site (NNSS, formerly called the Nevada Test Site). The work is being done at the request of Navarro-Interra LLC, and supports environmental restoration efforts by the Department of Energy, National Nuclear Security Administration for the Nevada Site Office. Safety decisions must be made before a surface crater area, or potential surface crater area, can be reentered for any work. Our statements on cavity collapse and surface crater formation are input into their safety decisions. These statements do not include the effects of erosion that may modify the surface collapse craters over time. They also do not address possible radiation dangers that may be present. Subject matter experts from the LLNL Containment Program who had been active in weapons testing activities performed these evaluations. Information used included drilling and hole construction, emplacement and stemming, timing and sequence of the selected test and nearby tests, geology, yield, depth of burial, collapse times, surface crater sizes, cavity and crater volume estimations, and ground motion. Both classified and unclassified data were reviewed. Various amounts of information are available for these tests, depending on their age and other associated activities. Lack of data can hamper evaluations and introduce uncertainty. We make no attempt to quantify this uncertainty.