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地震リスク評価の信頼度向上のための建屋の感度解析

Sensitivity study on nuclear reactor building modeling for reliability enhancement of seismic risk assessment of NPP

西田 明美  ; 高田 毅士*  ; 村松 健*

Nishida, Akemi; Takada, Tsuyoshi*; Muramatsu, Ken*

本研究では、原子力施設のリスクマネジメントの基盤技術としての地震起因事象に関する確率論的地震リスク評価手法について、評価結果に伴う不確実さを定量化するための検討に取り組んでいる。これまでに、機器のフラジリティ評価における認識論的不確実さ評価のうち、建屋・地盤応答解析の認識論的不確実さ評価にかかわる検討として、モデルプラントを対象とする感度解析や応答解析を実施している。本稿では、特に建屋の感度検討の結果得られた知見について述べる。

This project, focusing on uncertainty assessment framework and utilization of expertise, and finally developing relevant computer codes to improve reliability of seismic probabilistic risk assessment (SPRA) and to promote its further use of the SPRA, develops methodology for quantification of uncertainty associated with final results from SPRA in the framework of risk management of NPP facilities. The following scopes are set. (1) Development of framework of probabilistic models for uncertainty quantification and Computer codes, (2) Aggregation of expert opinion on structure/equipment fragility estimation and development of implementation guidance on epistemic uncertainty (modeling uncertainty), (3) Study on applicability of SPRA to model plant. In this report, analytical results of seismic response analysis and sensitivity study for a model plant building are shown.

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