This paper proposes a quantitative evaluation method of maintenance plan for nuclear power plants, developed by introducing the scientific approach, and also proposes a method to search an optimum maintenance plan to be obtained by maximizing nuclear safety and economic efficiency simultaneously, then balancing them. As a result of consideration, the following results were obtained. (1) The quantitative evaluation methodology for optimizing maintenance plan for nuclear power plants was developed. (2) ...
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Study of Optimization of Maintenance Plan for Nuclear Power Plants

This paper discusses maintenance optimization in maintenance implementation stage following maintenance planning stage in nuclear power plants and proposes a methodology to get an optimum maintenance work plan. As a result of consideration, the followings were obtained. (1) The quantitative evaluation methodology for optimizing maintenance work plan in nuclear power plants was developed. (2) Utilizing the above methodology, a simulation analysis of maintenance work planning for BWR's PLR and RHR syste...
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Study on Optimization of Normal Plant Outage Work Plan for Nuclear Power Plants

For creating a corrective measure plan for industrial plants like nuclear power plants, it is necessary to have a well-grounded basis. Therefore, this paper proposes a method for determining the fol lowing three elements of such a plan: the equipment to be repaired, the corrective measure method to be adopted, and the timing of its implementation using a scientific approach. The key idea is to analyze the components of the plan and also to take an approach of creating a plan based on the performance of the...
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Discussion of Corrective Action Planning for Nuclear Power Plants

For creating an inspection plan for industrial plants like nuclear power plants, it is necessary to have a well-grounded basis. Therefore, this paper proposes a method for determining the following three elements of such a plan: the equipment to be inspected, the inspection method to be adopted, and the timing of its implementation using a scientific approach. The key idea is to analyze the components of the plan by employing the understanding of cancer detection and diagnosis in medical science and a...
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Discussion of In-service Inspection Planning for Nuclear Power Plants

One of the most important things which should be explored in Maintenance Science is to make clear a structure and system of maintenance or maintenance activitie s. This study considered similarities between maintenance and emergency response in nuclear power plants from the viewpoint of Maintenance Science. As a result of consideration, this study showed the followings. (1) There are similarities b etween maintenance and emergency response in nuclear power plants -2Considering based on the similarities bet...
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Consideration on Similarities between Maintenance and Emergency Response in Nuclear Power Plants from the Viewpoint of Maintenance Science

The world nuclear industry and regulatory authorities have experienced various serious accidents including TMI-2, Chernobyl and Fukushima Daiichi accidents so far. The industry organizations and the regulators work on reflecting the lessons learned from these accidents, and continuously study the lessons from actual operation and maintenance of their systems, equipment and processes. From this reflection and study they seek to establish a common, dedicated and effective "safety culture". Very importantly, t...
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Study of Fundamental Concepts for Enhancing the Safety of Nuclear Power Plants

１．はじめに一般に産業プラントの保全は、必要最小限の保全作業を必要最小限の陣容で実施するのが合理的であり、なおかつ、保全作業量が年間を通じて一定もしくは大きく変動しないように計画されることが求められる。このような保全は、プラントの経済性の観点からだけでなく、安全性確保の観点からも、常に追求されている。それは、必要以上の保全を実施することによる逆効果や一時期に大量の保全作業が集中することによって保全活動の指揮命令系統の混乱等による事故故障の誘発を防止する必要があるからである。このため、世界の原子力発電所......

１．はじめに一般に産業プラントの保全は、必要最小限の保全作業を必要最小限の陣容･体制で実施するのが合理的であり、また、保全作業量が年間を通じて一定もしくは大きく変動しないように計画されることが望まれる。このため、世界の原子力発電所では一時期に大量の保全作業が集中しないように、各種の方策が考案され、実行されている（下図）。昨年11月に日本保全学会と東北大学GCOE｢流動ダイナミックス知の融合教育研究世界拠点｣の主催で開催された仙台国際セミナー において、米国NRCおよび米国原子力産業界の専門家３名による......

１．はじめに平成22年11月に日本保全学会と東北大学GCOE｢流動ダイナミックス知の融合教育研究世界拠点｣の主催で開催された仙台国際セミナー において、米国NRC及び米国原子力産業界の専門家３名による招待講演が行われ、米国ではプラントの安全性確保と稼働率の向上は「両立する」との見解を持っていることが示されるとともに、原子力発電所のリスクに対する大変重要な考え方が示された。これらの講演は、世界中の原子力発電所で保全作業を合理的に実施する方法として考案され、実用化されてきた各種方策（下図）の中から「運転中......

Technical codes and standards on natural phenomena, in particular, earthquake and tsunami for nuclear power plants in the other developed countries including IAEA safety standards were investigated. Then, the results were compared wi th the corresponding Japanese technical codes and standards. As a result, it was found that: (1) technical codes and standards on natural phenomena, especially those for earthquakes and tsunami/flooding in those foreign countries and their requirements are all included in the ...
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Investigative study on the technical code requirements of natural eventshazards for nuclear power plants