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강상희,이상원,강현국 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.3
After the Fukushima Daiichi accident, there has been an increasing preference for passive safety featuresin the nuclear power industry. Some passive safety systems require limited active components to triggersubsequent passive operation. Under very serious accident conditions, passive safety features could berendered inoperable or damaged. This study evaluates (i) the performance and effectiveness of thepassive safety features of iPOWER (innovative Power Reactor), and (ii) whether a severe accident conditioncould be reached if the passive safety systems are damaged, namely the case of heat exchangertube rupture. Analysis results show that the reactor coolant system remains in the hot shutdown conditionwithout operator actions or electricity for over 72 h when the passive auxiliary feedwater systems(PAFSs) are operable without damage. However, heat exchanger tube rupture in the PAFS leads to coredamage after about 18 h. Such results demonstrate that, to enhance the safety of iPOWER, maintainingthe integrity of the PAFS is critical, and therefore additional protections for PAFS are necessary. Toimprove the reliability of iPOWER, additional battery sets are necessary for the passive safety systemsusing limited active components for accident mitigation under such extreme circumstances