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「もんじゅ」点検期間長期化の要因分析及び次世代高速炉の保全合理化案の提案,1; 低温停止中の「もんじゅ」のプラント工程の分析

Proposal of maintenance rationalization for next-generation fast reactors based on the analysis of the prolonged maintenance of the prototype fast-breeder reactor in Japan, "Monju", 1; Analysis of plant schedule of "Monju" in cold shutdown

橋立 竜太 ; 豊田 晃大 ; 高橋 慧多; 矢田 浩基 ; 高屋 茂 

Hashidate, Ryuta; Toyota, Kodai; Takahashi, Keita; Yada, Hiroki; Takaya, Shigeru

原子力発電所の安全性と経済性を両立させるためには、発電所の特性に基づく合理的な保全を実現させる必要がある。一方で高速増殖原型炉「もんじゅ」は、年間の大半をメンテナンスに費やしてきた。もんじゅの点検期間長期化の要因を明らかにし、次世代高速炉の合理的な保全を実現することは重要である。本研究では、低温停止中のもんじゅの点検長期化の要因について、もんじゅのプラント工程を基に分析した。また抽出された課題から、保全の合理化の観点を提案した。

In order to improve both safety and economic efficiency of a nuclear power plant, it is necessary to realize rational maintenance based on characteristics of the plant. The prototype fast-breeder reactor in Japan, Monju, spent most of the year for the maintenance. Thus, it is important to identify causes of the prolonged maintenance of Monju and to investigate countermeasures for implementation of rational maintenance of next-generation fast reactors. In this study, the authors investigated the causes of the prolonged maintenance of Monju during reactor cold shutdown based on the plant schedule of Monju. In addition, we proposed the maintenance optimization idea for next-generation fast reactors to solve the revealed issues.

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