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Development of system based code, 2; Application of reliability target for configuration of ISI request

システム化規格の開発,2; 目標信頼度のISI要求設定への適用

高屋 茂  ; 岡島 智史 ; 栗坂 健一 ; 浅山 泰 ; 町田 秀夫*; 神島 吉郎*

Takaya, Shigeru; Okajima, Satoshi; Kurisaka, Kenichi; Asayama, Tai; Machida, Hideo*; Kamishima, Yoshio*

システム化規格概念は、高速増殖炉の信頼性,安全性、及び経済性の合理化を達成するために提案された。概念の具体化のためには、これらの異なる領域をつなげる指標及び目標値の設定が重要である。今回、PSA解析結果に基づき安全の観点からFBRの構造や機器について目標信頼度を設定する方法を新たに提案した。本発表では、同手法で設定された目標値を用いて原子炉容器液面近傍部におけるISI要求設定の試検討を実施することにより、提案指標の有効性とシステム化規格概念への適応性を示した。

The System Based Code (SBC) concept has been proposed to achieve compatibility in matters of reliability, safety, and cost of Fast Breeder Reactors (FBR). Therefore, a quantitative index which can connect different areas is required. In addition, the determination of its target value is also one of the key points to substantiate the SBC concept. We have proposed a new method to determine the reliability targets for the structures and components in FBR plants from the safety point of view by utilizing analysis models of a probabilistic safety assessment. In this study, the effectiveness of the proposed index and the compatibility of the reliability targets derived by the new method were shown through a trial setting of In-Service Inspection request on the reactor vessel near the sodium surface based on the SBC concept.

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