Reliability analysis of emergency diesel generators of Kori Nuclear units 3 and 4

This paper presents reliability analysis results and the insight gained for the emergency diesel generators (EDGs) of Kori Nuclear Power Units 3 and 4. Probabilistic safety assessment (PSA) for a nuclear power plant needs plant-specific data. In Kori Units 3 and 4 PSA, a station blackout sequence was judged to be the most dominant contributor to the core damage frequency. Therefore, there was an effort in plant-specific data collection and analysis on EDGs and Loss of Off-Site Power events. For the reliability analysis of EDG, the start failure probability, the repair time after start failure, and finally the maintenance unavailability are estimated based on the collected data. (author)