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논문 기본 정보

자료유형
학술대회자료
저자정보
류승훈 (Korea Institute of Nuclear Safety) 설광원 (Korea Institute of Nuclear Safety)
저널정보
대한기계학회 대한기계학회 춘추학술대회 대한기계학회 창립 70주년 기념 학술대회
발행연도
2015.11
수록면
4,149 - 4,152 (4page)

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초록· 키워드

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Gas accumulation phenomena of the piping systems for nuclear power plants have occurred since beginning of commercial operation. Gas accumulation may cause diverse safety issues such as pump cavitation, water hammering and unexpected gas intrusion to reactor vessel. In this study, Large Break Loss of Coolant Accident (LBLOCA) with the presence of non-condensable gas in the piping of Safety Injection Tank (SIT) was analyzed by RELAP5 code. The accident condition was conservatively assumed as 100% double-ended guillotine break at the reactor coolant pump discharge leg. The gas transport phenomena in the primary loop were analyzed. The portion of transported gas into the upper head, fuel assembly and pressurizer was quantified in this analysis. The analysis results showed that the choking flow was changed and the safety injection flow rate through SIT was reduced as reactor pressure was increased. The cladding temperature during the Reflood phase was increased because the gas prohibited heat transfer from fuel cladding to adjacent coolant. We concluded that the presence of non-condensable gas in the SIT piping may influence heat transfer phenomena in the reactor vessel and increase the Reflood cladding temperature in the LBLOCA analysis.

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Abstract
1. 서론
2. 대형냉각재상실사고 해석
3. 결론
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UCI(KEPA) : I410-ECN-0101-2016-550-002161600