Application of Probabilistic Performance Assessment Modeling for Optimization of Maintenance Studies for Low-Level Radioactive Waste Disposal Sites at the Nevada Test Site Page: 1 of 13
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WM'02 Conference, February 24-28, 2002 Tucson, AZ
APPLICATION OF PROBABILISTIC PERFORMANCE ASSESSMENT
MODELING FOR OPTIMIZATION OF MAINTENANCE STUDIES FOR LOW-
LEVEL RADIOACTIVE WASTE DISPOSAL SITES AT THE NEVADA TEST
SITE
Bruce Crowe
Environmental Restoration Project Office, Los Alamos National Laboratory
Las Vegas, Nevada 89193 croweb@nv.doe.gov
Vefa Yucel, and Stuart Rawlinson
Bechtel, Nevada
Post Office Box 98521
Las Vegas, NV 89193
Paul Black
Neptune and Company, Inc.
Los Alamos, New Mexico 87544
Jhon Carilli, and Frank DiSanza
U.S. Department of Energy
National Nuclear Security Administration, Nevada Operations Office
Post Office Box 98518
Las Vegas, NV 89193-8518
ABSTRACT
The U. S. Department of Energy (DOE), National Nuclear Security Administration of the
Nevada Operations Office (NNSA/NV) operates and maintains two active facilities on
the Nevada Test Site (NTS) that dispose defense-generated low-level radioactive waste
(LLW), mixed radioactive waste, and "classified waste" in shallow trenches and pits. The
operation and maintenance of the LLW disposal sites are self-regulated by the DOE
under DOE Order 435.1. This Order requires formal review of a performance assessment
(PA) and composite analysis (CA; assessment of all interacting radiological sources) for
each LLW disposal system followed by an active maintenance program that extends
through and beyond the site closure program. The Nevada disposal facilities continue to
receive NTS-generated LLW and defense-generated LLW from across the DOE complex.
The PA/CAs for the sites have been conditionally approved and the facilities are now
under a formal maintenance program that requires testing of conceptual models,
quantifying and attempting to reduce uncertainty, and implementing confirmatory and
long-term background monitoring, all leading to eventual closure of the disposal sites. To
streamline and reduce the cost of the maintenance program, the NNSA/NV is converting
the deterministic PA/CAs to probabilistic models using GoldSim, a probabilistic
simulation computer code. The output of probabilistic models will provide expanded
information supporting long-term decision objectives of the NTS disposal sites.1
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Crowe, B.; Yucel, V.; Rawlinson, S.; Black, P.; Carilli, J. & DiSanza, F. Application of Probabilistic Performance Assessment Modeling for Optimization of Maintenance Studies for Low-Level Radioactive Waste Disposal Sites at the Nevada Test Site, article, February 25, 2002; Tucson, Arizona. (https://digital.library.unt.edu/ark:/67531/metadc785466/m1/1/: accessed March 28, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.