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자료유형
학술저널
저자정보
저널정보
한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제52권 제5호
발행연도
2020.1
수록면
975 - 983 (9page)

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Since the Fukushima Daiichi accident in 2011, concerns for the safety of multi-unit Nuclear Power Plant(NPP) sites have risen. This is because more than 70% of NPP sites are multi-unit sites that have two ormore NPP units and a multi-unit accident occurred for the first time. After this accident, ProbabilitySafety Assessment (PSA) has been considered in many countries as one of the tools to quantitativelyassess the safety for multi-unit NPP sites. One of the biggest concerns for a multi-unit accident such asFukushima is that the consequences (health and economic) will be significantly higher than in the case ofa single-unit accident. However, many studies on multi-unit PSA have focused on Level 1 & 2 PSA, andthere are many challenges in terms of public acceptance due to various speculations without an engineeringbackground. In this study, two kinds of multi-unit Level 3 PSA for multi-unit site have beencarried out. The first case was the estimation of multi-unit risk with conservative assumptions toinvestigate the margin between multi-unit risk and QHO, and the other was to identify the effect of timedelays in releases between NPP units on the same site. Through these two kinds of assessments, weaimed at investigating the level of multi-unit risk and understanding the characteristics of risk in a multiunitcontext.

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