Component reliability data from 1982 to 1997 on 49 Japanese LWRs accumulated in the nuclear component reliability data system

Nuclear Information Center (NIC) of Central Research Institute of Electric Power Industry (CRIEPI) serves utilities by providing safety-, and reliability-related information on operation and maintenance of the nuclear power plants, and by evaluating the plant performance and incident trends. As a result of these evaluations, a nuclear component reliability data system has been developed for estimating failure rate of major components for use in PSA. Internet-Web client at the utilities can access this data system. The users can select component, plant, system and time period, and then compute the failure rate by the data system. Data of component failure are continuously being collected from utilities and transferred into the data system for the estimation of component reliability within Japan. A set of domestic component reliability data from April 1, 1982 to March 31, 1991 for 34 LWRS has been evaluated by CRIEPI, and the evaluation report was issued in January 1996. This set of data has been reviewed by a group of PSA experts in Japan at the Nuclear Safety Research Association (NSRA) in 1995 and 1996, and the reviewed report was issued in March 1997. This document describes the revised component failure rate calculated by the data system on 49 Japanese LWRs from April 1, 1982 to March 31, 1997. (author)