Interest has been aroused in recent years in the reliability assessment of passive systems, being developed by suppliers, industries, utilities and research organisations, aiming at plant safety improvement and substantial simplification in its implementation. The present study is concerning Passive Systems designed for Decay Heat Removal relying upon natural circulation which foresee, for the most part, a condenser immersed in a cooling pool. This is in order to identify and rank by importance the potential hazards related to passive system equipment and operation which may critically affect the safety or availability of the plant. More specifically the content of the paper reports the analysis of the Isolation Condenser system foreseen for the advanced Boiling Water Reactors for removal of the excess sensible and core decay heat by natural circulation during isolation transients.
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