第17回
Radiation-Induced Volume Expansion in Concrete Aggregate Minerals Studied by Ion Irradiation and Step Height Measurement
著者:
Muammar Hawary Patris, Kenta Murakami, Luu Vu Nhut, Xinrun Chen,(長岡技科大), Ippei Maruyama,(名古屋大), Takahiro Ohkubo,(千葉大), Kiyoteru Suzuki,(三菱総研)
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Long-term radiation exposure can cause damage of concrete structures due to the volume expansion of the aggregate minerals. In this study, granite, sandstone, and tuff were irradiated with 2.8 MeV Fe2+ at room temperature to different level of ion fluences. Step height measurement was conducted to quantify the volume change. It was found that the swelling of all minerals saturated at around 300 nm. Tuff, which contains almost all silica, exhibited the fastest swelling, among others. ...
第15回
コンクリート構造物のASR診断方法に関する評価
著者:
江藤 淳二,(三菱総研),五十嵐 豪,(東北大),小川 彰一,渋谷 和俊,(太平洋コンサルタント),丸山 一平,(名古屋大学),山田 一夫,(国立環境研究所),滝沢 真之,(三菱総合研究所)
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Recently, many concrete structures such as bridge piers of the highway, damaged by Alkali Silica Reaction (ASR) have been observed in Japan. From this background, based on the latest knowledge of domestic and international, the ASR diagnostic method that emphasizes the petrological examination after the core sampling was proposed on Japan Nuclear Energy Safety Organization (JNES) report. In this research, in order to confirm the effectiveness of ASR diagnostic method for concrete structures proposed in JNES...
英字タイトル:
Evaluation on ASR diagnostic method for concrete structures
第17回
原子力発電所の安全かつ合理的な廃止措置に向けた課題の整理と解決方針(案)について
著者:
小野寺 将規,江藤 淳二,末永 知晃,柳川 玄永,鈴木 浩,(三菱総研)
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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...
英字タイトル:
Issues and Solution for Safe and Rational Decommissioning of Nuclear Power Plants
第17回
原子力規制検査の効率的運用および検査官の能力向上等に関する 調査研究 その1
著者:
江藤 淳二,杉野 弘樹,小野寺 将規,藤山 翔乃,中島 清,義澤 宣明,鈴木 清照,(三菱総研)
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Regarding the nuclear regulatory inspection system that came into effect in April 2020, the authors conducted a questionnaire and interview surveys with NRA staff involved in inspection work for the purpose of improving inspection capability and efficient operation of inspections. As a result of the investigation, it became clear that the inspector's conceptual understanding of nuclear regulatory inspection has permeated. In particular, it was confirmed that the understanding of the four concepts of nuclear...
英字タイトル:
Research on the efficient operation of nuclear regulatory inspections and the improvement of inspectors' abilities Part1
第17回
原子力規制検査の効率的運用および検査官の能力向上等に関する 調査研究 その2
著者:
杉野 弘樹,江藤 淳二,小野寺 将規,藤山 翔乃,中島 清,義澤 宜明,鈴木 清照,(三菱総研)
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Regarding the nuclear regulatory inspection system that came into effect in April 2020, we conducted a questionnaire survey and interview survey with NRA staff involved in inspection activities for the purpose of improving inspection competence and efficient operation of inspection system. As a result of the survey, it became clear that the inspectors' understanding of the concept of nuclear regulatory inspection system was pervasive, while improvements related to the improvement of the inspector's competen...
英字タイトル:
Research on the efficient operation of nuclear regulatory inspection system and inspectors' capabilities Part 2
第16回
火災防護に関する米国の検査事項事例を用いた安全重要度評価ガイド(試運用版)の試行
著者:
江藤 淳二,中島 清,(三菱総研)
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Preparations related to details of forming the inspection system and trials Phase1 and Phase 2 will be implemented for the full startup in 2020. As the problems obtained in the trial operation, the lack of understanding for the risk-informed / performance-based inspection and the screening of the findings became apparent. Therefore, in this paper, with the aim of contributing to the development of the market price for evaluation, we conducted a trial of Significance Determination Process (SDP) using the US ...
英字タイトル:
Application of guide (trial operation version) about Significance Determination Process (SDP)for inspection findings about fire protection in United States
第15回
軽水炉コンクリート構造物の照射劣化予測手法の開発に係る研究計画
著者:
滝沢 真之,鈴木 清照,江藤 淳二,河合 理城,藤山 翔乃,(三菱総研),丸山 一平,(名古屋大),紺谷 修,澤田 祥平,石川 俊介,(鹿島建設)
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A new research program of irradiation effects on LWR concrete member has been started since 2017. The previous research results indicate the reference level of neutron irradiation degradation on concrete should be set at 1 x 1019 n/cm2 which is one order of magnitude lower than the conventional reference level used in Japan. Several issues remain after the previous research and the objectives for clarifying the issues are set in the new project which is scheduled for five and half years. And international c...
英字タイトル:
The Research Plan on Development of Evaluation Method of LWR Concrete Irradiation Effect