SEISMIC PRA FOR KASHIWAZAKI-KARIWA NPS UNIT7

摘要

A seismic PRA was carried out in order to confirm the effectiveness of measures related to Kashiwazaki-Kariwa NPS (KK-NPS) that are aimed at improving safety and founded upon lessons learned from Niigata-Chuetu-Oki Earthquake (NCO) in 2007 and The 2011 off the Pacific coast of Tohoku Earthquake (the Tohoku Earthquake)) in 2011 as well as from understanding our plant vulnerability to Earthquakes. The lessons learned from the Fukushima Daiichi (Fl) accident and findings gathered from the Great Eastern Japan Earthquake were reflected in both the hazard evaluation and the sequence evaluation during the seismic PRA. In this evaluation, we were able to confirm the effectiveness of safety measures carried out towards plant vulnerabilities that were found before these measures were implemented. Additionally, our objective is to continually work towards improving the level of safety through utilizing risk which also accounts for results from seismic and other PRA in order to assess effective countermeasures. Here, we will also evaluate the findings extracted from the seismic PRA carried out this time in studying how to 'improve the accuracy of fragility evaluations of portable equipments' and 'methods for implementing evaluation conditions for redundancy'.