Seismic Reliability Evaluation of Electrical Power Transmission Systems and itsEffect on Core Damage Frequency

摘要

This paper presents the results of seismic capacity evaluation of electrical transmission equipment in substations usingrnthe damage records in the case of the Southern Hyogo Prefecture earthquake in 1995, the seismic reliability of electricalrnpower transmission systems and its influence on core damage frequency of a nuclear power plant. Since damages ofrnelectrical equipment in substations were found mostly in those manufactured before a revision of seismic design guidelinernin 1980, seismic capacity of electrical equipment was separately evaluated for those manufactured before and after thernrevision. The failure probability of electrical power transmission systems was higher than the occurrence probability of lossrnof offsite power due to failures of ceramic insulators in the site switchyard and its effect on the core damage frequency ofrnthe nuclear power plant was not significant.