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Preparation of component failure rates for reprocessing plant PSA

再処理施設PSAのための機器故障率整備

玉置 等史; 吉田 一雄; 上田 吉徳*

Tamaki, Hitoshi; Yoshida, Kazuo; Ueda, Yoshinori*

原子力施設のPSAでは、評価対象施設の運転経験を反映した機器故障率に基づく事故発生頻度評価結果は、重要なリスク情報の一部であるが、再処理施設の運転経験を反映した機器故障情報はほとんどない。このため、再処理施設へのリスク情報を活用した安全規制の導入を促進するには、当該施設のPSAで利用できる機器故障率を整備する必要がある。原子力機構では、東海再処理施設の運転経験に基づく故障率の整備を行うとともに、原子力発電所等で整備した故障率を再処理施設の機器に援用する際の注意事項の抽出のための機器故障率データベースの調査と再処理施設PSAに利用できる一般故障率の整備手順の検討を進めている。本報告では、故障率の援用に関する注意事項の調査の進め方及び一般故障率整備手順構築のための課題について検討した結果について説明する。

A risk-informed regulation will be applied to not only nuclear power plants but also nuclear fuel facilities in Japan. It is important for risk-informed regulation to assure the results of PSA. Component failure rates used in the frequency evaluation play an important role to assure the quality of PSA. Reprocessing plants are recognized as having higher risk than that of other nuclear fuel facilities. However, accident frequencies happened in reprocessing plants are evaluated almost using component failure rates estimated from operation experiences of nuclear power plants because those parameters estimated from experiences of reprocessing plants are limited. In order to improve the quality of results of accident frequencies in reprocessing plants, a project was launched in 2005 at JAEA. This project is consisted of two activities and is performed under entrustment from JNES. One is the estimation of component failure rates based on maintenance data from Tokai Reprocessing plant which has been operating since 1977 in Japan. The other is the preparation of component failure rates for frequency evaluation of accidents in reprocessing plants. This presentation will introduce the second activity.

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