N reactor external events probabilistic risk assessment using NUREG-1150 methods

A full-scope level III probabilistic risk assessment (PRA) has been under way since 1986 for N reactor, a U.S. Department of Energy (DOE) category A reactor located on the Hanford site in Washington State. The methods developed for the U.S. Nuclear Regulatory Commission (NRC) by Sandia National Laboratories (SNL) in support of the NUREG-1150 effort were adapted for the analysis. The objectives of the study are to assess the risks from both internal and external initiators to the public (off-site) and to workers at co-located DOE facilities (on-site), compare those risks to proposed DOE safety guidelines and NRC safety goals, identify changes to the plant for further safety enhancement, and document a key safety assessment report and living PRA for N reactor