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核燃料施設の事故影響評価手法に関する調査,3; 放射線分解水素爆発事象の事故影響評価手法に関する基礎的データ

Research on consequence analysis method for probabilistic safety assessment of nuclear fuel cycle facilities, 3; Fundamental data for consequence evaluation of the radiolytically generated hydrogen gas explosion

石田 倫彦 ; 林 芳昭*; 上田 吉徳*; 吉田 一雄 

Ishida, Michihiko; Hayashi, Yoshiaki*; Ueda, Yoshinori*; Yoshida, Kazuo

原子力発電施設を対象としたリスク情報活用が実用段階を迎えるなか、核燃料施設のリスク情報活用に資する核燃料施設の特徴を踏まえた確率論的安全評価(PSA: Probabilistic Safety Assessment)の確立が望まれている。こうした状況を踏まえ、核燃料施設事故影響評価手法調査専門委員会では、平成16年度より日本原子力研究開発機構からの受託業務として、核燃料施設のPSA手法のうち、特に事故時の影響評価のための解析手法に重点をおいてPSAに適用可能な解析手法について調査検討を実施してきた。本報では、再処理施設における放射線分解水素ガスの爆発事象に着目し、事故シナリオ検討及び事故影響評価に関する調査結果を紹介する。

A special committee of "Research on the analysis methods for accident consequence of nuclear fuel cycle facilities (NFCF)" was organized by the Atomic Energy Society of Japan (AESJ) under the entrustment of Japan Atomic Energy Agency (JAEA) for a research on the state-of-the-art of consequence analysis method for Probabilistic Safety Assessment (PSA) of NFCF such as fuel reprocessing and fuel fabrication facilities. The objectives of this research is to obtain the basic useful information related for establishing the quantitative performance requirement and for risk-informed regulation through qualifying issues needed to be resolved for applying PSA to NFCF. In this technical report, it was summarized that the research result about basic experimental data related to the consequence of the radiolytically generated hydrogen gas explosion postulated in the radioactive solution reserve tank caused by the loss of dilution air supply.

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