Maintenance engineers are optimizing the maintenance of maintenance target equipment in the activities of Preventive Maintenance Optimization (PMO). This optimization activity needs to be reviewed on the basis of the previous operation and maintenance experience, and there is a "maintenance template" as a tool that can assist it appropriately and efficiently. We have discussed the utilization of maintenance templates in Japan as an important tool to show the optimization of maintenance, and the way of its u...
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Discussion for Role of the Maintenance Template in Japan

1.はじめに 日 本 電 気 協 会「 原 子 力 発 電 所 の 保 守 管 理 規 程 」 (JEAC4209)は、「検査の在り方に関する検討会」で示 された保守管理の基本的理念を受け、平成 15 年に規 定化し、平成 19 年及び平成 26 年に改定を行った。ま た「原子力発電所の保守管理指針」(JEAG4210)は、 JEAC4209 の改定に合わせ、平成 19 年に制定し、平成 26 年に改定を行った。 平成 19 年の制改定では、「検査の在り方に関する検討 会」の議論を踏まえた「新保全プログラ......

Principles of Nuclear Power Station's maintenance was established as Code for Maintenance at Nuclear Power Plants (JEAC 4209) in 2003 and revised in 2007,2014 And also Guide for Maintenance at Nuclear Power Plants was established in 2007 and revised in 2014. Recently these Code & Guide were revised accordingly and published as JEAC4209-2016 and as JEAG 4210-2016. Revising these Code & Guide are now under review. Points of the revision is to implement the new regulatory inspection system enforced in 2020 ref...
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Progress report of Revising Code and Guide for Maintenance at Nuclear Power Plants

In Japan, the decommissioning of a number of nuclear power plant is planned or underway. In order to implement the decommissioning safely and rationally, not only the nuclear industry but also a wide range of stakeholders, such as the local governments where the plants are located, must cooperate to solve the issues that are barriers to the safe and rational implementation of the decommissioning. For this background, Mitsubishi Research Institute carried out to identify the cross-industry issues of decommis...
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Issues and Solution for Safe and Rational Decommissioning of Nuclear Power Plants

背景および概要近年、国内の沸騰水型原子力発電プラント（BWR）炉心シュラウドや再循環系（PLR）配管等の低炭素ステンレス鋼製機器の溶接部で、多数の応力腐食割れ（Stress Corrosion Cracking: 以下、SCC） が確認された［1］。2003年10月には健全性評価制度が法制化され、SCC 等の欠陥が発生した機器についても、機械学会維持規格［2］に基づく技術的評価により健全性が確認されれば継続運転が可能となった。ただし、PLR配管のSCCに ついては、従来の超音波探傷検査（UT）では十分な精......

Grease lubricated bearings needs adding grease periodically for keeping good condition. Sometimes bearings have abnormal temperature with over lubrication. We can avoid the situation with herring rotation sound of bearings on the greasing. That sound turn normal sound when bearings have appropriate lubrication. At the time we stop adding grease. As a result, we can avoid over lubrication. However, feeling of the sound are different with each person. Therefore we used visualization of sounds technology for t...
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Activity of avoiding over lubrication for grease lubricated bearings

我が国の新しい保全プログラムにおけるリスク情報の活用 宮田 浩一,Koichi MIYATA,鈴木 康郎,Yasuro SUZUKI １．はじめに　平成20年度の運用開始に向け，原子力発電所の新しい保全プログラムが検討されている。これは，原子力委員会の「原子力政策大綱」[1]において保守管理技術の高度化に期待が示されたことや，関西電力㈱美浜発電所３号機で二次系配管の破損事故が発生し，高経年化対策を充実する必要性が高まったことを受け， 総合資源エネルギー調査会原子力安全・保安部会「検査の在り方に関する検......

The structural integrity of equipment and piping systems to a fault displacement depends on the damage state of a reactor building. When there is no damage in a reactor building, the supporting function of equipment and piping systems is maintained. In this case, FEM analysis can estimate the allowable state of the entire system of the important safety equipment. In this part, an example of the analysis evaluation for the equipment and piping systems, which are important for safety, in the case of loading a...
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Risk Evaluation Method for Faults Displacement by Engineering Approach (4)The Analysis Evaluation of Equipment and Piping System

Clean-up activity of spent fuel powder (UO2 powder etc.) in mechanical treatment cell was performed for the purpose of the preparation of decommissioning at TRP.For the clean-up activity, we selected an inexpensive vacuum cleaner and made tools, that was improved taking into account of use by means of a crane or a manipulator in the high dose cell, and applied it after a mock-up test.We report our experience and knowledge provided through this clean-up activity....
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Clean-up activity of spent fuel powder (UO2 powder) in mechanical treatment cell at Tokai reprocessing plant

The Hamaoka Nuclear Power Station has always embraced the most up-to-date knowledge in its effort to enhance safety. We have been carrying out safety measures both before and after the accident at TEPCO's Fukushima Daiichi Nuclear Power Station, including countermeasures for tsunami and severe accidents. In response to the government introduction of New Regulatory Requirements, we are adopting a series of safety measures. No More Fukushima Daiichi Accidents With this resolve, the Hamaoka Nuclear Power Sta...
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Safety enhancement measures at the Hamaoka Nuclear Power Station