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Development of prototype reactor maintenance, 3; Application to valves of sodium-cooled reactor prototype

研究段階炉の保全の開発,3; ナトリウム冷却原型炉のバルブに対する適用

近澤 佳隆; 高屋 茂; 田川 明広; 久保 重信

Chikazawa, Yoshitaka; Takaya, Shigeru; Tagawa, Akihiro; Kubo, Shigenobu

研究開発段階発電用原子炉施設(以下、「研開炉」という。)の特徴を考慮して、原子炉施設の安全性確保を最優先としつつ、炉型に適した保守管理技術体系を構築するために実施すべき保守管理に関する検討結果を行った。本報告では提案した研開炉の保守管理の考え方に基づき、ナトリウム冷却高速炉の特有な機器であるナトリウム弁の保全計画(点検計画)を検討した例を示す。

A maintenance management required to prototype nuclear power reactors has been developed. One of important mission of a prototype reactor is to develop maintenance program for commercial reactors step by step securing safety. Since operating experience at the early stage is limited, the maintenance program for the prototype reactor should be a progressive one. It has to be modified and improved frequently taking into account R&D insight and operation experiences. Additionally, the maintenance program has to consider features of the prototype reactor even at the early stage. To select maintenance grades on particular components/systems, risk informed and graded approaches are effective. And maintenance programs have to take into account degradation mechanism originally due to reactor features. In this paper, applications for maintenance program on sodium valves of prototype fast breeder reactor Monju are studied as an example of prototype sodium-cooled reactors (SFR).

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