Some insights gained from conducting an EPRI-sponsored review of five PRA studies

A number of Probabilistic Risk Assessment (PRA) studies have been completed for specific plants at specific sites, and many more are in progress. These studies, motivated by a variety of objectives, range in scope from limited extrapolations of the Reactor Safety Study (RSS, 1975) methods or adaptations of RSS results (studies conducted under the NRC's Reactor Safety Study Methodology Applications Program - RSSMAP) to full-scale PRAs which retain the key elements of the RSS methodology, but have introduced new and improved techniques. As of mid-1983, twelve full scope (Level 3) PRA studies have been completed for LWRs located in the United States. These are presented together with information on operating license date, the plant basic design features, study sponsorship, report availability, initiation and completion dates