Status of the low power and shutdown accident sequence analysis project for the Grand Gulf Nuclear Power Station

This paper describes the current status of Phase 1 and 1A of the BWR Low Power and Shutdown Accident Frequencies Program being conducted at Sandia National Laboratories for the US Nuclear Regulatory Commission. The major focus of the project to date has been the identification and coarse screening quantification of accident sequences initiated in modes of operation other than full power. The coarse screening provides a filtering mechanism whereby the potentially important accident sequences are identified. The information obtained during these two phases will be used to prioritize the more detailed analyses which will occur during Phase 2 of this project. A summarization of the project including results and insights from Phase 1 and 1A is presented. 2 refs., 5 figs.