Abstract
A computer code package SUPKIT has been developed for the efficient evaluation of system reliability on the basis of fault-tree-analysis. SUPKIT calculates time-dependent system unavailability, evaluates component sensitivity to system failure and estimates the confidence bound of system unavailability, though it relies on the fundamental methodology of PREP-KITT used in “WASH1400 Reactor Safety Study”. The present report attempts to study the applicability of this calculation procedure as a numerical tool for the system reliability evaluation.In an application to a simplified ECCS, the obtained result is studied on the time-dependent behavior of minimal cut set and system unavailabilities, uncertainty propagation through minimal cut sets and component sensitivity to system unavailability.Our experience with SUPKIT recommends the research on the semi-automated fault-tree construction and more rough-and-ready method to estimate the confidence bound of system unavailability.
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