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概要

Secondary system piping was ruptured at Mihama Nuclear Power Station Unit 3 of Kansai Electric Power Company in August 2004, and 11 workers were injured and killed. The operators of PWRs in Japan established and implemented the guidelines for wearing management procedure about secondary system piping. In this study, the management system of Japan and foreign countries were compared, and the validity of the domesti c wearing management technique was examined. Consequently, it was acknowledged a great difference in the maintenance degree of wearing piping by the electric power company in U. S., and the number of repair p ortions of Japan was more than equivalent with upper range of repaired number of U. S.. Therefore, the wearing management system of Japan was compared favorably with U. S. and it thinks that it is appropriate.

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