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Hashidate, Ryuta; Toyota, Kodai; Takahashi, Keita; Yada, Hiroki; Takaya, Shigeru
Hozengaku, 19(4), p.115 - 122, 2021/01
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.
Hashidate, Ryuta; Toyota, Kodai; Takahashi, Keita; Yada, Hiroki; Takaya, Shigeru
no journal, ,
In order to achieve both safety and economic efficiency of a nuclear power plant, it is necessary to realize rational maintenance based on characteristics of the plant. The fast breeder prototype reactor, Monju, spent most of the year for the maintenance. It is important to identify causes of the prolonged maintenance of Monju and to investigate countermeasures for implementation of rational maintenance of a next fast reactor. In this study, causes of the prolonged maintenance of Monju during reactor cold shutdown were investigated based on the plant operation of Monju. In addition, proposals for the maintenance optimization idea of a next generation fast reactor were presented to address the revealed issues.
Toyota, Kodai; Hashidate, Ryuta; Takahashi, Keita; Yada, Hiroki; Takaya, Shigeru
no journal, ,
In order to achieve both safety and economic efficiency of a nuclear power plant, it is necessary to realize rational maintenance based on characteristics of the plant. The fast breeder prototype reactor, Monju, spent most of the year for the maintenance. It is important to identify causes of the prolonged maintenance of Monju and to investigate countermeasures for implementation of rational maintenance of a next fast reactor. In this study, causes of the prolonged maintenance of Monju during reactor cold shutdown were investigated based on the plant maintenance plan of Monju. In addition, proposals for the maintenance optimization idea of a next generation fast reactor were presented to address the revealed issues.
Tanaka, Masaaki; Oki, Shigeo; Miyazaki, Masashi; Takaya, Shigeru; Yokoyama, Kenji; Ando, Masanori
no journal, ,
Design optimization support tool named ARKADIA-Design for diverse nuclear power plant has been developing in Japan Atomic Energy Agency. Its development plans, goals, and schedules in the fields of core, plant structure including thermal-hydraulics, and maintenance are presented with brief introduction of progress at present.
Hashidate, Ryuta; Yada, Hiroki; Takaya, Shigeru; Futagami, Satoshi; Yamano, Hidemasa; Kurisaka, Kenichi; Enuma, Yasuhiro
no journal, ,
If components can be maintained according to a target reliability of nuclear power plants, plant safety and economic efficiency could be improved by avoiding excessive or insufficient margins. This approach can rationalize the maintenance of low target reliability components and concentrate resources (people, money, and time) on the maintenance of high target reliability components. It would take a long time to evaluate the target reliability for all components in the plant by quantitatively using probabilistic risk assessment. This paper, therefore, proposed at a first step a simple screening method which determines necessity of quantitative risk assessment for maintenance rationalization using risk information. Specifically, this method was applied to determining necessity of quantitative risk assessment to the laundry system whose function has little contributor to the plant safety of nuclear power plant, and we proposed the maintenance rationalization of the laundry system.
Demachi, Kazuyuki*; Chen, S.*; Dong, F.*; Yoshikawa, Masanori; Seki, Akiyuki; Takaya, Shigeru
no journal, ,
no abstracts in English