1．材料の役割と環境による劣化物質には、物理的性質、化学的性質の他に、社会的な性質がある。物質が材料として、社会的性質を表すのは、材料は目的を負わされた物質あるいは物質のシステムであるからである（1）。機器・設備を設計する場合、それらがどのような目的を負わされ、どのような環境で利用されるかを考える必要がある。ここで扱うべき材料の挙動とは、上記のように定義されるべき材料が、ある環境におかれた時の材料と環境の動的な相互作用である。原子力材料が他の材料と比べ最も異なる点は、放射線照射環境においてその機能を果たさ......

In this study, we make a new proposal for the maintenance plan to optimize the total cost, which includes the cost of inspection and replacement, and the damage of the accident. It treats the probability distribution of the initial value and degradation rate of the perfo rmance of equipments. We apply it to the pipe thinning phenomenon in PWR secondary systems....
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A Proposal for the Method to Optimize the Maintenance from the Viewpoint of the Cost and Errors of Inspection

In this study, a structure of code and standard system for plant maintenance is discussed. And also where the guideline for leakage management, developed by the special research committee of Japan society of cenology (ISM), should occupy a position in the code and standard system is discussed. As a result of deration, it was concluded as follows. Iaintenance program for plant compone nts consists of two (2) parts, a regular program for dealing with ninor ageing and a special program for dealing with specif...
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Study on the Position of Leakage Management Guideline in OM Code and Standard System

Particularly, Since the on Fukushima the system Dai-ichi safety assessment accident, the of importance plants in operation, of “system the safety” various has degradation been recognized. aspects with transiti on of time ha been emphasized. Accordingly, functional degradation will be the assessment target, reliability and assessment the changes will in the be made safety on codes the consolidation and the concept of of important safety will functions be dealt under with; a where, system, the not on individ...
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Lessons & Learns from Fukushima Daiichi Accident and New Concept of System Safety on Nuclear Power Plants

A special committee for the “Development of Research & Development Roadmap regarding Power Reactor Safety” was formed in the Atomic Energy Society of Japan (AESJ) in 2004 und er a contract with the Japan Nuclear Energy Safety Organization to examine the “Aging and Plant Life Management Roadmap”. The examination by the special committee was conducte d based on a common understanding among the industrial, governmental and academic communities to figure out the future strategies for plant life management in o...
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Role of Advanced Maintenance Activities in the Roadmap for Aging and Plant Life Management

The major research and development fields for ageing management of complex systems such as nuclear power plants are categorized into the following 4 items; 1) research and development of technologies for inspection, eval uation and repair in the components and materials, 2) engineering information systems, 3) development of codes and standards and 4) synthesized maintenance engineering. The “synthesized maintenance engineering” field in cludes methodologies for optimum combination for inspection, maintenan...
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Research and Development Strategy and Maintenance Engineering to Strengthen the Basis of Ageing Management

Systematic development of information basis for database and knowledge-base has been performed in addition to the development of c odes and standards by academic societies, regulatory bodies and industries through the intensive domestic safety research collabo rations and international collaboration. Continuous revision of Strategy Maps for Ageing Management and Safe Long Term Operation h as been performed under the Coordinating Committee of Ageing Management to promote effective research and development a...
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Research and Development Strategy and Maintenance Engineering to Strengthen the Basis of Ageing Management, 3rd report

Systematic development of information basis for database and knowledge-base has been performed in addition to the development of codes and s tandards by academic societies, regulatory bodies and industries through the intensive domestic safety research collaborations and internatio nal collaboration, through the continuous revision of Strategy Maps for Ageing Management and Safe Long Term Operation. Important internatio nal activities in IAEA and OECD/NEA especially for knowledge-base and extraction of com...
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Research and Development Strategy and Maintenance Engineering to Strengthen the basis of Ageing Management: International Activities