次世代高速炉の合理的な設計や保全の最適化を実現するためには，もんじゅにおける点検長期化の要因を分析し，課題の整理と対策案を検討することが重要となる．本論文では，高速炉の稼働率向上を目的に，保全合理化検討のための概略的分析の結果を報告する． 具体的には，もんじゅの保全に関する全体傾向の把握及び保全合理化の余地が大きいと考えられる保全内容を抽出するため，もんじゅ保全計画に記載されている点検タスクの情報を分析した．また，得られた分析結果に対し，保全合理化の提案を行った．...
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Proposal of Maintenance Rationalization for Next-Generation Fast Reactors based on the Analysis of the Prolonged Maintenance of the Prototype Fast-Breeder Reactor in Japan, “Monju” (2) ～Analysis of Maintenance Plan of “Monju” in Reactor Cold Shutdown～

本論文では、点検自体の期間も長く、その遅延が直接プラント工程に影響を及ぼすクリティカルパスの点検に着目し、もんじゅの点検に要する期間が長期化した要因を分析する。この要因に対し、次世代高速炉における合理的な保全を実現し、稼働率を向上させることを目的とした、次世代高速炉の設計や運用に反映すべき対策を検討した。...
英字タイトル:
Proposal of Maintenance Rationalization for Next-Generation Fast Reactors based on the Analysis of the Prolonged Maintenance of the Prototype Fast-Breeder Reactor in Japan, “Monju”? (1) ～Analysis of Plant Schedule of “Monju” in Cold Shutdown～

This study is examination of the quantitive valuation method of maintenance activities of a nuclear powe r plant. Therefore, the concept of the maintenance equation that examination was advanced in the Japan S ociety of Maintenology or the Japan Society of Mechanical Engineers (JSME) was arranged. Basic examinati on for a maintenance equation to formulize the above-mentioned examination to reference was carried out....
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Study on the quantitive analysis approach for maintenance

This report describes the effectiveness of the application of acoustic diagnosis using vibration data for nspecting rotating machines. We usually apply the vibration diagnosis for the inspection of rotating machines on CBM(Condition Based Maintenance). However, with the vibration diagnosis, sometimes we annot discover the cause of abnormal sounds fro m rotating machines. Therefore, we tried another iagnosis. We converted the vibration data to the acoustic data and then inspected the abnormal sounds. We se...
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Application of Acoustic diagnosis for rotating machines

In this paper, we propose a new method for extracting design issues on maintenance. Maintenance periods might be prolonged due to design issues. In the proposed method, maintenance preconditions are extracted by organizing the design information. A maintenance schedule is created by using extracted maintenance preconditions. If the created maintenance schedule doesn't achieve target periods, design issues could be extracted from the viewpoint of maintenance precondition. A simple example using "Monju" desig...
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Proposal of a Method of Extracting Design Issues on Maintenance for the Rational Design of Next-Generation Reactors

A maintenance management suitable to nuclear power plants (NPP) at R&D stage was discussed. Objectives of maintenance management of NPP at R&D stage was first clarified. Next, applicability of codes for maintenance management of commercial NPP to NPP at R&D stage was discussed. Then, requirements and consideration for maintenance management of NPP at R&D stage was proposed. Finally, an example that the proposal was applied to setting maintenance program of sodium-cooled fast reactor was presented. ...
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Proposal of Maintenance Management of Nuclear Power Plants at R&D Stage by Taking Account of Their Features

A maintenance management suitable to nuclear power plants (NPP) at R&D stage was discussed. Objectives of maintenance management of NPP at R&D stage was first clarified. Next, applicability of codes for maintenance management of commercial NPP to NPP at R&D stage was discussed. Then, requirements and consideration for maintenance management of NPP at R&D stage was proposed. ...
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Proposal of Maintenance Management of Nuclear Power Plants at R&D Stage by Taking Account of Their Features (1) Basic Requirements

A maintenance management suitable to nuclear power plants (NPP) at R&D stage was discussed. Objectives of maintenance management of NPP at R&D stage were first clarified. Next, applicability of codes for maintenance management of commercial NPP to NPP at R&D stage was discussed. Then, requirements and consideration for maintenance management of NPP at R&D stage was proposed. In this paper, requirements on maintenance program of NPP at R&D stage were clarified and an example that the proposal was applie...
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Proposal of Maintenance Management of Nuclear Power Plants at R&D Stage by Taking Account of Their Features (2) case study

The ductile-brittle transition behavior of neutron-irradiated welded A533B Cl.1 steel has been studied by means of small specimen test technique for discussing the specime n size effects on the impact properties. Standard size, one-third size and 1.5mm size Charpy V-notch specimens were prepared. Neutron irradiation was performed in JMTR wit h fluencies up to 0.75 and 1.3 X 1024 n/m°(E>1 MeV). Normalization of the USE is done by a curve fitting method and the USE of different size of specimens can be expre...
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Evaluation Technique of Neutron-Irradiation Embrittlement in Welded RPV

This paper describes effectiveness of applying acoustic diagnosis to the greasing work. When we hear abnormal sounds from grease lubricated bearings, we try greasing. As a result, usually abnorm al sounds fade away. But after a while sometimes the sounds appear again. Therefore we try greasing again. The sounds fade away at the time but later appear again. We try greasing again and agai n but the results are the same. By this time, the temperature of the bearing has increased a lot. If the temperature incr...
英字タイトル:
Acoustic diagnosis improves maintenance of grease lubricated bearings