Development of the IPRO-ZONE for internal fire probabilistic safety assessment

Fire probabilistic safety assessment (PSA) analysts have been manually determining fire-induced component failure modes and modeling them into PSA logics. These are time-consuming tasks, and may be difficult as they require a lot of information and many events should be modeled. KAERI has been developing the IPRO-ZONE (interface program for constructing zone effect table) to facilitate fire PSA works for identifying and modeling fire-induced component failure modes, and to construct a one-top fire event PSA model. A one-top fire event PSA model is automatically constructed with the output of the IPRO-ZONE, the AIMS-PSA, and internal event one-top PSA model. The output of the IPRO-ZONE includes information on fire scenarios, fire propagation areas, equipment failure modes affected by a fire, internal PSA basic events corresponding to fire-induced equipment failure modes, and the fire events to be modeled. This paper introduces the IPRO-ZONE, and its application results to fire PSAs for Ulchin Unit 3 and SMART (System-integrated Modular Advanced Reactor).