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자료유형
학술저널
저자정보
임승현 (경북대학교) 최인길 (한국원자력연구원) 양범주 (충북대학교) 곽신영 (한밭대학교)
저널정보
한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제53권 제3호
발행연도
2021.3
수록면
967 - 973 (7page)
DOI
https://doi.org/10.1016/j.net.2020.07.032

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In 2011, an earthquake and subsequent tsunami hit the Fukushima Daiichi Nuclear Power Plant, causingsimultaneous accidents in several reactors. This accident shows us that if there are several reactors onsite, the seismic risk to multiple units is important to consider, in addition to that to single units inisolation. When a seismic event occurs, a seismicefailure correlation exists between the nuclear powerplant’s structures, systems, and components (SSCs) due to their seismic-response and seismic-capacitycorrelations. Therefore, it is necessary to evaluate the multi-unit seismic risk by considering the SSCs’seismic-failure-correlation effect. In this study, a methodology is proposed to obtain the seismicresponse-correlation coefficient between SSCs to calculate the risk to multi-unit facilities. This coefficient is calculated from a probabilistic multi-unit seismic-response analysis. The seismic-response andseismic-failure-correlation coefficients of the emergency diesel generators installed within the units aresuccessfully derived via the proposed method. In addition, the distribution of the seismic-responsecorrelation coefficient was observed as a function of the distance between SSCs of various dynamiccharacteristics. It is demonstrated that the proposed methodology can reasonably derive the seismicresponse-correlation coefficient between SSCs, which is the input data for multi-unit seismic probabilistic safety assessment.

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