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자료유형
학술저널
저자정보
저널정보
한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제51권 제1호
발행연도
2019.1
수록면
45 - 53 (9page)

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Thermal-hydraulic passive safety systems (PSSs) are incorporated into many advanced reactor designs onthe bases of simplicity, economics and inherent safety nature. Several factors among which are thecritical parameters (CPs) that influence failure and reliability of thermal-hydraulic (t-h) passive systemsare now being explored. For simplicity, it is assumed in most reliability analyses that the CPs are independentwhereas in practice this assumption is not always valid. There is need to critically examine thedependency influence of the CPs on reliability of the t-h passive systems at design stage and in operationto guarantee safety/better performance. In this paper, two multivariate analysis methods (covariance andconditional subjective probability density function) were presented and applied to a simple PSS. Themethods followed a generalized procedure for evaluating t-h reliability based on dependency consideration. A passively water-cooled steam generator was used to demonstrate the dependency of theidentified key CPs using the methods. The results obtained from the methods are in agreement andjustified the need to consider the dependency of CPs in t-h reliability. For dependable t-h reliability, it isadvisable to adopt all possible CPs and apply suitable multivariate method in dependency considerationof CPs among other factors.

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