Results and insights from the low power and shutdown Level 1 PRA of the Grand Gulf Nuclear Power Station.

摘要

The US Nuclear Regulatory Commission's Office of Nuclear Regulatory Research has undertaken a two-phase project to analyze the frequencies, consequences, and risk of accidents occurring during modes of operation other than full power (i.e., low power and shutdown (LP&S) conditions). The Phase 1 work represented a ''coarse screening'' of all identified modes of operation. The results were used to identify which set of plant operating conditions would be subjected to a detailed analysis during Phase 2. This paper presents an overview of the results from the current Phase 2 effort to identify and quantify the various accident sequences that can lead to severe core damage. This overview encompasses the detailed analysis of potential accidents that could occur at the Grand Gulf Nuclear Power Plant while in the Cold Shutdown Phase (Plant Operational State (POS) 5) of a refueling outage.