Criticality Frequency Analysis For De-inventory Of Lawrence Livermore National Laboratory's Special Nuclear Materials To Savannah River Site

摘要

In support of the Department of Energy's (DOE) National Nuclear Security Administration (NNSA) Complex Transformation Initiative, Lawrence Livermore National Laboratory (LLNL) is packaging Special Nuclear Material (SNM) to be sent to Savannah River Site (SRS). SRS's K-Area Material Storage (KAMS) facility is selected as the storage location until the excess materials are dispositioned. The KAMS facility is not equipped with a criticality alarm system. As such, compliance with SRS criticality safety requirements necessitates a demonstration that the frequencies of criticality events at KAMS are below the Criticality Accident Alarm System (CAAS) exclusion frequency of le-6/yr. Demonstration of a BEU (beyond extremely unlikely) criticality frequency for the KAMS facility requires a detailed evaluation of the associated material storage processes. Compliance with the container fissile material limit is one component in ensuring criticality safety.