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高速増殖原型炉「もんじゅ」の保全の在り方; 「もんじゅ」保全の特徴と軽水炉保全経験の反映

Principles of MONJU maintenance; Characteristic of MONJU maintenance and reflection of LWR maintenance experience to FBR

仲井 悟; 西尾 竜一; 内橋 昌也; 金子 義久; 山下 裕宣*; 山口 篤憲*; 青木 孝行*

Nakai, Satoru; Nishio, Ryuichi; Uchihashi, Masaya; Kaneko, Yoshihisa; Yamashita, Hironobu*; Yamaguchi, Atsunori*; Aoki, Takayuki*

高速増殖炉は、燃料の増殖と放射性廃棄物中のマイナーアクチニドを燃料として再利用できることから、ウラン燃料を有効に利用できるとともに環境負荷を低減できる特長を有している。「もんじゅ」は、原型炉として実証炉・実用炉の設計、運転保守に不可欠な技術を確立する役割、すなわち安全・安定運転を達成しプラントとしての信頼性を実証するとともに、運転経験を通じて、高速増殖炉の運転、保全技術等を確立する。ここでは、冷却材としてナトリウムを用い、軽水炉と異なる固有の設備を有する「もんじゅ」の保全の在り方について、これまでの日本保全学会の「もんじゅ」保全に関する検討について報告する。

A sodium cooled fast breeder reactor (FBR) has unique systems and components and different degradation mechanism from light water reactor (LWR) so that need to establish maintenance technology in accordance with its features. The examination of the FBR maintenance technology is carried out in the special committee for considering the maintenance for Monju established in the Japan Society of Maintenology (JSM). As a result of the study such as extraction of Monju maintenance feature, maintenance technology benchmark between Monju and LWR components and survey of LWR maintenance experience, it is clear that principles of maintenance are same as LWR, necessity of LWR maintenance experience reflection and points to be considered in Monju maintenance. The road map to establish a FBR maintenance technology in the technical aspect became clear and it is vital to acquire operation and maintenance experience of the plant to implement this road map, and to establish a fast reactor maintenance.

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