다수기의 확률론적 지진안전성 평가를 위한 지진손상 상관계수의 적용
Feasibility Study of Seismic Probabilistic Risk Assessment for Multi-unit NPP with Seismic Failure Correlation
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초록
후쿠시마 원전사고 발생으로 다수기의 지진안전성에 관한 연구의 필요성이 부각되었다. 한 부지에 건설된 원자력발전소의 경우 유사한 지진응답을 보이기 때문에 적게나마 원자력발전소 SSCs간의 지진손상에 대하여 상관성이 존재하므로 합리적 지진안전성 평가를 위하여 지진손상 상관성을 고려하여야 한다. 본 연구에서는 쌍둥이 호기의 필수전원상실사건에 대하여 확률론적 지진안전성 평가를 수행하였다. 적절한 지진손상 상관계수를 도출하기 위하여 확률론적 지진응답해석을 수행하여 적용하였다. External EventMensuration System 프로그램을 활용하여 다수기의 필수전원상실사건의 고장수목을 구성하여 지진취약도 및 지진리스크를 분석하였다. 또한 SSCs간의 지진손상 상관성을 완전독립 및 완전종속으로 고려하여 비교 분석을 수행하였다.
Abstract
The 2011 East Japan Earthquake caused accidents at a number of nuclear power plants in Fukushima, highlighting the need for astudy on the seismic safety of multiple NPP (Nuclear Power Plant) units. In the case of nuclear power plants built on a site that shows asimilar seismic response, there is at least a correlation between the seismic damage of structures, systems, and components (SSCs) ofnuclear power plants. In this study, a probabilistic seismic safety assessment was performed for the loss of essential power events oftwin units. To derive an appropriate seismic damage correlation coefficient, a probabilistic seismic response analysis was performed. Using the external event mensuration system program, we analyzed the seismic fragility and seismic risk by composing a failure tree ofmultiple loss of essential power events. Additionally, a comparative analysis was performed considering the seismic damage correlationbetween SSCs as completely independent and completely dependent.
참고문헌 (12)
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