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

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*

System Based Code (SBC) extends the present structural design standard to include the broad areas related to FBR design and operation. Therefore, a quantitative index that can correlate these different areas is required. One such index is the probability of failure. The determination of a target value is also one of the key points. We have proposed a new method to determine reliability targets for structures and components in FBR plants from the viewpoint of safety. In this study, the effectiveness of the probability of failure as an index and the reliability targets produced using the new method are investigated through a trial setting of an in-service inspection (ISI) requirement for a reactor vessel. The results show that the reactor vessel has sufficient reliability even without an ISI. Through this example, we demonstrate that the probability of failure is a promising index and that reliability targets derived using the new method are compatible with SBC.