Abstract
Reactor vessel depressurization is an important measure before an accident sequence progresses to the point of vessel bottom head penetration failure under high-pressure condition. The passive depressurization systems can depressurize the reactor coolant system to prevent or to mitigate the effects of direct containment heating instead of the safety/relief valves (SRV) if SRV is inoperable or it is stuck in the closed position. The sensitivity analysis performed with SAMPSON code in this study demonstrated that the passive depressurization system with an optimized leakage area and failure condition is more efficient in managing a severe accident.
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