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논문 기본 정보

자료유형
학술저널
저자정보
유선오 (한국원자력안전기술원) 김만웅 (한국원자력안전기술원)
저널정보
한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제53권 제10호
발행연도
2021.10
수록면
3,236 - 3,246 (11page)
DOI
https://doi.org/10.1016/j.net.2021.04.007

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초록· 키워드

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Lessons learned from the Fukushima Daiichi nuclear power plant accident directed that multiple failuresshould be considered more seriously rather than single failure in the licensing bases and safety casesbecause attempts to take accident management measures could be unsuccessful under the high radiationenvironment aggravated by multiple failures, such as complete loss of electric power, uncontrollable lossof coolant inventory, failure of essential safety function recovery. In the case of the complete loss ofelectric power called station blackout (SBO), if there is no mitigation action for recovering safety functions, the reactor core would be overheated, and severe fuel damage could be anticipated due to thefailure of the active heat sink. In such a transient condition at CANDU-6 plants, the seal failure of theprimary heat transport (PHT) pumps can facilitate a consequent increase in the fuel sheath temperatureand eventually lead to degradation of the fuel integrity. Therefore, it is necessary to specify the regulatoryguidelines for multiple failures on a licensing basis so that licensees should prepare the accident management measures to prevent or mitigate accident conditions. In order to explore the efficiency ofimplementing accident management strategies for CANDU-6 plants, this study proposed a realistic accident analysis approach on the SBO transient with multiple-failure sequences such as seal failure of PHTpumps without operator's recovery actions. In this regard, a comparative study for two PHT pump sealfailure modes with and without coolant seal leakage was conducted using a best-estimate code toprecisely investigate the behaviors of thermal-hydraulic parameters during transient conditions. Moreover, a sensitivity analysis for different PHT pump seal leakage rates was also carried out to examine theeffect of leakage rate on the system responses. This study is expected to provide the technical bases to theaccident management strategy for unmitigated transient conditions with multiple failures

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