Present status of the Nuclear Power Reliability Data Bank in Japan

Since its establishment in October, 1984, under instruction by the Ministry of International Trade and Industry, Nuclear Power Safety Information Research Center has built up the nuclear information data base on the construction, operation and maintenance of the nuclear power stations (NPSs) to aid in the effective fulfillment of national safety administration. The outline of the data base will be introduced herein. Based on the incident and failure information in Japan stored in the data bank to date, the Center has started the evaluation program of unavailability of the engineered safety systems as system level failure rate (FR) and of FRs of the major valves, pumps and heat exchangers as component level FR since JFY 1987. The outline of the results of the program will be also described. (author). 4 figs, 1 tab