１． はじめに　我が国の商業用原子力発電プラント数は、東北電力（株）の東通原子力発電所１号機及び北陸電力（株）の志賀原子力発電所2号機がそれぞれ平成17年12月8日及び平成18年3月15日に運転が開始され、合計55基（図1参照）となり、米国（104基）、フランス（58基）に次ぐ第3位に位置している。　一方、平成22年には運転開始後30年を超えるプラントが20基となり、同年には運転開始後40年を迎えるプラントが現出する状況下にある。　このような背景の下、平成8年4月、当時の通商産業省資源エネルギー庁は、......

After Fukushima Daiich Accident, some international organizations have been discussed on importance of defense in depth (DiD), total comprehensive evaluation contained 14 Safety Factors in PSR (IAEA SSG-25) and HOF (Human and Organization Factors). The NRA allowed review by the IAEA Integrated Regulatory Review Service (IRRS) mission team, over the twice of 2008 and 2016. As a few recommendation examples on above these points to NRA, acquisition of human resources as able talented person and personnel...
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Human resource Development Activities lesson learned International standard after Fukushima Daiichi Accident towards a Proactive Nuclear Regulatory

Technical evaluation is required before applying new preventive maintenance and repair welding. However, in a utility, the field where development of new maintenance technology is not made positively can see from the uncertainty of approval process. In view of such the present, NISA and JNES recognize to need gathering of information positively and p rior review is performed with a margin about the new maintenance technology which introduction will be expected from now on is improved to enable quick and st...
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On compatibility review to the technical standard of new preventive maintenance technology

While the Codes and Standards provided by standard developing organization, such as JSME, have been extensively used for maintenance activities with their endorsement by the Japanese regulatory authority, those Codes and Standards are not necessarily used effectively under Japanese regulatory system. This paper provides status of Japanese regulatory system on maintenance activities on Nuclear Power Plant’s facilities as well as several issues on effective application of Repair and Replacement Section o...
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Effective Usage of Codes and Standards for Maintenance Activities 三菱重工業(株) 小山 幸司 Koji KOYAMA Member

As described in the IAEA Safety standards both No. SSG-25 “PSR for NPPs” and No.NS-G-2.12 “Ageing Management for NPPs”, maintenance activities for SSC is very important. Physical ageing of SSCs may increase the probability of common cause failures, which could result in the impairment of one or more levels of protection provided by the defense in depth concept. Therefore, Inspection, evaluation and repair & replacement in “Standards for Nuclear Power Generation Equipment (Maintenance Standards) for JSM...
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Codes and Standards in Repair and Replacement Process . Concern on the technical evaluation by Nuclear Regulatory Agency－

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

１．はじめに　原子力安全・保安院は、平成17年8月「実用発電用原子炉施設における高経年化対策の充実について」（以下、｢高経年化対策の充実について｣）[1]において、原子力発電所の高経年化に対応し技術情報基盤を整備するためには、次の国際的な展開が必要であると提言した。① 高経年化対策等に関連した国際協業・国際会議への戦略的・計画的な参加② 米国NRC（原子力規制委員会）等の海外規制機関、IAEA（国際原子力機関）、OECD/NEA（経済協力開発機構／原子力機関）等の国際機関との政府間及び民間ベースの協力......

Many activities for the coordinated research on aging management are reviewed, and examples of fruitful results are introduced according to the technical strategy map. Industry-Academia-Government exchanging system of the information each other on aging management was established for autonomy, diversity, ration. To clarify the concept of the role of industry, government and academia to address aging ment without duplication algorithm is for the overall coordination of industrial and academic ition and resp...
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Coordination Among Industry, Academic Society and Regulatory Bodyin The Research on Aging Management

The number of plants exceeding 30 years after the start of their commercial operation will reach 20 units in 2010, and one of those plants will see even its 40th anniversary after the s tart of its commercial operation in the same year. Under these circumstances the aging management of nuclear power plants has been one of the key issues from the viewpoint of maintainin g safety and reliability of nuclear power plants. Under such background, JNES has started the development of the technical information basi...
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Information network of ageing and Deterioration management table