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학술저널
저자정보
저널정보
한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제49권 제2호
발행연도
2017.1
수록면
373 - 379 (7page)

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Seismic probabilistic safety assessments are used to help understand the impact potentialseismic events can have on the operation of a nuclear power plant. An importantcomponent to seismic probabilistic safety assessment is the seismic hazard curve whichshows the frequency of seismic events. However, these hazard curves are estimatedassuming a normal distribution of the seismic events. This may not be a strong assumptiongiven the number of recorded events at each source-to-site distance. The use of a normaldistribution makes the calculations significantly easier but may underestimate or overestimatethe more rare events, which is of concern to nuclear power plants. This papershows a preliminary exploration into the effect of using a distribution that perhaps morerepresents the distribution of events, such as the t-distribution to describe data. Theintegration of a probability distribution with potentially larger tails basically pushes thehazard curves outward, suggesting a different range of frequencies for use in seismicprobabilistic safety assessments. Therefore the use of a more realistic distribution resultsin an increase in the frequency calculations suggesting rare events are less rare thanthought in terms of seismic probabilistic safety assessment. However, the opposite wasobserved with the ground motion prediction equation considered.

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