公開データ及び情報に基づく日本の原子力発電プラントのパフォーマンス評価（２）
Performance Evaluation of Japanese Nuclear Power Plantbased on Open Data and Information (2)
著者:
永田 匡尚 Tadahisa NAGATA 杉山 憲一郎 Ken-Ichiro SUGIYAMA
発刊日:
公開日:
Plant Engineering Performance
概要
The operation term of the Japanese nuclear power plants (NPPs) is shorter than other countries. Moreover, the outage period is longer. Excessive maintenances may result in early “infant mortality” failures (early failures). However, the statistical evaluation about failure type of t he Japanese NPPs was not found. Therefore, evaluation of plant engineering performance was tried on open data/information with a statistical method. The Weibull analysis, which needs not only failure data but also maintenance data, was applied to the evaluation. However, maintenance date/information of the failed equipment which caused plant shutdowns were not in public. Therefore, every equipment was assumed to be maintained during every shutdown. The improvement of calculation is needed, because this assumption may make conservative result by the multiple coun ting of the plant operation term. The Competing Risk Model may not apply for comprehensive evaluation for all failure. The calculation method of the Hazard was reexamined according to the definition of the Hazard. The result of the usual method may not conservative than this method.
