川内原子力発電所の安全裕度評価について
概要
Sendai Nuclear Power Station is the first one in Japan whose units has restarted under new regulatory requirements after Fukushima-Daiichi Nuclear Disaster. For these restarted units, Safety Improvement Assessment is mandated to be conducted after every outage by the new regulatory requirements. The assessment shall be reported to Nuclear Regulatory Authority (NRA) and disclosed on the Web. Kyushu Electric Power Company submitted the assessment report first in Japan to NRA on July 6, 2017 for Sendai unit 1, on September 25, 2017 for Sendai unit 2 in compliance with this requirement. As a part of the assessment, we conducted stress-test for seismic event and flooding to identify robustness of the unit and also developed the countermeasures to mitigate the impact caused by such events when cliff-edge was reached. This paper describes the overview of stress-test in the assessment.
