Review and Analysis of Insights from Plant Transients Gained from the Interim Reliability Evaluation Program

摘要

The Interim Reliability Evaluation Program (IREP) was designed to develop and implement improved methods of PRA systems analysis. The methods were used to analyze four plants, two PWRs and two BWRs (Arkansas Nuclear One Unit 1, Calvert Cliffs Unit 1, Browns Ferry Unit 1 and Millstone Unit 1). This paper presents a review of the methodology improvements employed in IREP as a result of problems identified in the Reactor Safety Study Methodology Application Program (RSSMAP) and other programs. Each area where improvements were made is discussed. The general subjects which are discussed are initiating events, modeling depth and systems interactions, human interactions, and data. Lastly, a comparison is made of the results of the Calvert Cliffs RSSMAP and IREP studies and examples of how each of the improvements in analysis procedures affected the PRA results are presented. (ERA citation 09:002450)