Abstract
There is more concern for the safety of NPPs in Taiwan after the Fukushima nuclear power plant (NPP) disaster occurred. Therefore, Taiwan Power Company developed an additional ultimate measure category, ultimate response guideline (URG), to prevent and mitigate Taiwan NPPs from encountering core damage for events beyond design basis. The main actions of URG are the depressurization and low pressure water injection of reactor and containment venting. Lungmen NPP is the first ABWR NPP in Taiwan. In this study, we focus on the thermal-hydraulic and fuel rod performance analysis for the URG study of Lungmen NPP. Therefore, TRACE/FRAPTRAN model of Lungmen NPP was developed in order to estimate the URG efficiency under Fukushima-like conditions. TRACE/FRAPTRAN analysis results show that the URG can keep the PCT below the criteria 1088.7 K under Fukushima-like conditions.