STUDY ON IN-VESSEL RETENTION-ANALYSIS OF IN-VESSEL RETENTION USING RISK ORIENTED ACCIDENT ANALYSIS METHODOLOGY-

摘要

In-Vessel Retention (IVR) is a potential means of mitigating the progression of a severe accident. Using IVR, molten core debris is stabilized by cooling the outer surface of the reactor vessel. In this study, failure probability of IVR to mitigate the progression of a severe accident has been comprehensively analyzed using the Risk-Oriented Accident Analysis Methodology (ROAAM).