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高温ガス炉の確率論的安全評価手法(確率論的リスク評価手法)の開発

Probabilistic risk assessment method development for high temperature gas-cooled reactors

佐藤 博之  ; 西田 明美  ; 古屋 治*; 村松 健*; 糸井 達哉*; 高田 毅士*  ; 田辺 雅幸*; 山本 剛*

Sato, Hiroyuki; Nishida, Akemi; Furuya, Osamu*; Muramatsu, Ken*; Itoi, Tatsuya*; Takada, Tsuyoshi*; Tanabe, Masayuki*; Yamamoto, Tsuyoshi*

本研究では、高温ガス炉の設計上、安全上の特徴を考慮した確率論的安全評価手法(確率論的リスク評価手法)の確立を目標に、グレーデッドアプローチを取り入れた事故シーケンス頻度評価手法、黒鉛構造物の損傷を考慮した事故影響評価手法を検討する。本発表では、全体概要として、既往手法からの改良点、研究計画等を中心に説明する。

The proposed research aims to establish a probabilistic risk assessment method for high temperature gas-cooled reactors fully utilizing their design and safety characteristics. The method will be developed for the incorporation of a graded approach as well as a component failure evaluation model using the operation and maintenance experience in the high temperature engineering test reactor into an accident frequency analysis. In addition, a source term evaluation method considering failures in core graphite components will be developed.

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