Electronic Journal of Advanced Maintenance (EJAM) has been issued on the website of Japan Society of Maintenology (JSM) on May 25th, 2009. ‘New Technology’ (NT) is one of the EJAM categories, and introduces widely advanced techniques developed or modified for maintenance to developing countries of nuclear energy. EJAM NT has achieved to publish two or three articles in average by every three months for these seven years. In this paper, as well as classification and organization of relevant techniques in ...
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Achievement of EJAM ‘New Technology’ and Its Status

１．まえがき東海第二発電所（1978年11月営業運転開始）は、第21回定期事業者検査中の2005年（平成17年）5月、図１に示すシュラウドサポートシリンダ軸方向溶接継手（以下「V8」という）3箇所に応力腐食割れ（SCC）と推定される割れが確認され、（社）日本機械学会（以下JSME）の維持規格、及び（社）日本原子力技術協会（以下原技協）の炉内構造物点検評価ガイドライン（以下ガイドライン）を適用した評価により一定期間内の構造健全性を示し、割れを補修することなく継続使用し、3年、7年、10年経過後の最初の定......

Similar cracking events have been occurring on steam generator nozzles of Japanese PWR plants since the first case was found at Mihama-2 in September 2007. These cracks were found by eddy current test (ECT) prior to performing a kind of shot peening as a preventive measure on dissimilar metal weld (DMW), a nd were considered as primary water stress corrosion cracking (PWSCC) based on cause investigation. It was pointed out that surface finishing such as grinding or machining played an important role on cra...
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Cracking Events on PWR Steam Generator Nozzles and Its Relationship to Inspection Rules

It is important for maintenance of nuclear power station facilities in the future to promote mathematical techniques which support judgement to modify maintenance practices, such as maintenance tasks, maintenance implementation timing, and so on. Mathematical Maintenance Working Group, which has been established by Maintenance Standardization Committee since July 6, 2018, is investigating application examples of such mathematical techniques in maintenance planning as influence evaluation of changing maint...
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Investigation on application examples of mathematical techniques to support judgement to modify maintenance practices

It is necessary to improve not only plant system but also human system for maintenance to optimize maintenance for industrial plants like nuclear power plants. Codes and standards for design and construction of plant system have been already well developed. On the contrary, standardization of documents relating to human system including maintenance implementation plan, field work procedures etc. have poorly developed. So we have established the special committee in Japan Society of Maintenology to standardi...
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Necessity and Direction of Consideration of Maintenance Standardization

One year has passed since Electronic Journal of Advanced Maintenance (EJAM) was started on the website of Japan Society of M aintenology (ISM) May 25“, 2009. “New Technology' (NT) is one of the EJAM categories, and introduces widely advanced techniqu es developed or modified for maintenance. Twenty-two NT articles have been introduced on EJAM website so far as of May 25t“, 2010. This report describes the concept of NT, general features of NT articles, actual performance and future wishes for NT....
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Current Status of EJAM ‘New Technology

Needs for development of practical technologies such as repair and mitigation, and necessity of conceptual summarization on those technologies are proposed. Temporary repair technology is focused in particular, to discuss its development needs for simple application and effectiveness for short period. Next, aggressive movements for standardization of allowable leak rules and repair technologies including the tentative ones in the United States are pointed out to find a promising orientation of utilizing...
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Needs for Temporary Repair Technology and Concept of Mitigation

Repair and Replacement Process (RRP) is one of the most important activities for maintenance of components or facilities in Nuclear Power Stations. Codes and Standards in RRP have been developed for a long time by some industrial organizations, such as Japan Power Engineering and Inspection Corporation (JAPEIC), Thermal and Nuclear Power Engineering Society (TENPES), Japan Nuclear Safety Institute (JANSI) and Japan Society of Mechanical Engineers (JSME). Though it seems to have some discussions for RR...
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Codes and Standards in Repair and Replacement Process: Needs and Uses

Working Group on Application Enhancement of Repair Replacement Technology has been established since September 2015, for the purpose of studying specific measures to create an environment that Japanese utilities can easily make corrective actions such as repair replacement technology applicable to Nuclear Power Plant to improve the safety of their own plants, and meetings have been held five times until the end of April 2016. In this paper, discussions on the WG meetings so far are shown, as well as th...
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Current Status of WG on Application Enhancement of Repair Replacement Technology