Review and evaluation of the Indian Point Probabilistic Safety Study

Abstract

This report summarizes the review of the internal and external event portions of the Indian Point Probabilistic Safety Study (IPPSS). The review was conducted by Sandia National Laboratories and Sandia contractors over approximately a 6-month period. The purpose of the review was to search for areas in the IPPSS where omissions and critical judgements were made which could impact the quantitative results. The review identified several of these areas. This report also evaluated, in a preliminary way, some proposed Indian Point plant modifications which were based on the insights of the IPPSS but were not included in the IPPSS results. A comparison of the quantitative results in this report, which assumes the plant modifications are in place, with the IPPSS results yields less than a factor of two difference on the overall plant core melt frequency.