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高速炉機器の信頼性評価に関するガイドラインの整備

Development of guidelines for structural reliability evaluation for FBR

高屋 茂  ; 町田 秀夫*; 神島 吉郎*

Takaya, Shigeru; Machida, Hideo*; Kamishima, Yoshio*

現在、日本機械学会システム化規格作業会にて整備中の高速炉機器の信頼性評価に関するガイドラインの概要を紹介する。ガイドラインは、「総則」、「信頼性評価」、「破損シナリオの設定」、「モデル化」、「破損確率の算出」の五つの章から構成され、評価の全体的な流れと、各ステップでの評価内容が説明されている。さらに、高速炉における代表的な劣化事象であるクリープ疲労に関しては、クリープ疲労損傷の蓄積によるき裂発生とその後のき裂進展評価の詳細手順を添付として準備した。

This paper describes the outline of the guidelines on structural reliability evaluation for the passive components of the fast breeder reactor (FBR). The guidelines are now being prepared by the working group for the system based code in the Japan society of mechanical engineers. They consist of five chapters, which are "General rules", "Reliability evaluation", "Failure scenario setting", "Modeling", and "Failure probability calculation", respectively. In the chapter of "Reliability evaluation", the general procedures of reliability evaluation are explained. Detailed procedures at each step are explained in the following chapters in the guidelines. Evaluation procedures for accumulation damage and crack propagation due to creep-fatigue interaction are also provided in the appendix of the guidelines because creep-fatigue interaction is a typical degradation phenomenon in FBR.

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