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STRUCTURAL ANALYSIS APPROACH FOR RISK ASSESSMENT UNDER BDBE
https://nied-repo.bosai.go.jp/records/4807
https://nied-repo.bosai.go.jp/records/48078f66ee79-57dd-458a-9439-4ba15ba9b7e7
Item type | researchmap(1) | |||||||||||||||
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公開日 | 2023-03-30 | |||||||||||||||
タイトル | ||||||||||||||||
言語 | en | |||||||||||||||
タイトル | STRUCTURAL ANALYSIS APPROACH FOR RISK ASSESSMENT UNDER BDBE | |||||||||||||||
言語 | ||||||||||||||||
言語 | eng | |||||||||||||||
著者 |
Naoto Kasahara
× Naoto Kasahara
× Izumi Nakamura
× Hideo Machida
× Koji Okamoto
× Takuya Sato
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抄録 | ||||||||||||||||
内容記述タイプ | Other | |||||||||||||||
内容記述 | Based on the lessons learned from the Fukushima nuclear power plant accident, it is recognized the importance of the risk assessment and mitigation for failure consequences to avoid catastrophic failure of pressure equipment during severe accidents (SA) and excessive earthquake. The objectives of structural design (from the first layer to the third layer of the defense-in-depth) is strength confirmation under assumed loading conditions. On the other hand, ones of risk assessment and mitigation (the forth layer of the defense in-depth) is prediction of realistic failure scenarios. Through investigation of failure locations and modes of main components under both severe accident and excessive earthquake, different failure modes from DBE(Design Basis Events) were identified for BDBE(Beyond Design Basis Events). To clarify these modes, the failure mechanisms were studied with some strength experiments. For most of failure modes, their dominant parameters are inelastic strain rather than stress. So that large scale inelastic analysis methods were studied and extended to very high temperature and large strain. By using above results, this paper has proposed the new structural analysis approach for risk assessment under BDBE. This is the extension of "design by analysis" concept. However it is clearly different from design approach from next viewpoints. (1) Additional failure modes to design condition Such additional failure modes induced by excessive loadings are considered for as local failure, creep rupture, creep buckling, ratcheting collapse and so on. (2) Identification of dominant failure modes Design codes require conservative evaluation against all of assumed failure modes. On the other hand, risk assessment needs adequate failure scenarios, where failure locations, modes and their order are important. For that reason, dominant failure modes have to be identified. To identify dominant modes, failure mode map concept was proposed. (3) Best estimation To estimate realistic accident phenomena, the best estimation is required. Therefore, dominant strength parameters and criteria without safety margins should be adopted. Through strength mechanism investigations, plastic and creep strain are recognized as more dominant parameters than stress for many failure modes. So that realistic inelastic analyses are recommended for BDBE. |
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言語 | en | |||||||||||||||
書誌情報 |
en : PROCEEDINGS OF THE ASME PRESSURE VESSELS AND PIPING CONFERENCE, 2016, VOL 3 巻 PVP2016-63416,, 号 V003T03A086, 発行日 2017 |
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出版者 | ||||||||||||||||
言語 | en | |||||||||||||||
出版者 | AMER SOC MECHANICAL ENGINEERS | |||||||||||||||
DOI | ||||||||||||||||
関連識別子 | 10.1115/PVP2016-63416 |