HPR1000 is a Chinese Generation-III advanced nuclear power plant (NPP) technology. By largely considering feedback from other PWR NPPs at home and abroad and lessons learned from Fukushima nuclear accident, it implements an active-and-passive safety design philosophy with comprehensive counter-measures for severe accidents. HPR1000 design has been optimizing progressively as the demand of better cost-efficiency increasing, with the restriction of not reducing level of safety. The latest refinements include enhanced countermeasures against design basic conditions and severe accidents, redesign of a double-wall containment into a single-wall, and optimization of power supply configuration. Risk-informed design approaches are comprehensively implemented in the design and verification process. Particularly, Level 2 PSA is applied in the optimization of severe accident prevention and mitigation measures to avoid the extravagant redundancy of system configurations. HPR1000 preliminary level 2 PSA practices consider internal events of the reactor in the context of at-power and shutdown condition. Alternatives of configuration of severe accidents mitigation and prevention system was compared and its impact on the overall large release frequency (LRF) level was evaluated. Feasibility of a single-wall containment and its contribution to LRF was also investigated. The results showed that severe accident prevention and mitigation systems, such as active and passive cavity injection system, passive secondary side heat removal system, and passive containment heat removal system, perform well in reducing LRF and overall risk level of HPR1000 NPP. The internal event LRF is around 3\*10E-8/reactor-year, which meets the requirement of Chinese regulatory for new build NPP. Failure of reactor vessel and SGTR accident are among the top accidents that contribute most to LRF. As for the containment, the modified single-wall design does not apparently affect LRF compare to the double-wall. Internal events and equipment that contribute most to LRF was identified. Dominant sequences and cut sets are listed and reviewed. The level 2 PSA analysis results indicate that HPR1000 design is reliable with no major weaknesses.


Level 2 PSA Overview of HPR1000 Nuclear Power Plant

Division / Sponsors: 
Power Division & Nuclear Engineering Division (NED)

Power Conference
Paper Proceedings: https://asmedigitalcollection.asme.org/POWER/POWER2020/volume/83747

International Conference on Nuclear Engineering
Paper Proceedings: https://asmedigitalcollection.asme.org/ICONE/ICONE2020/volume/83761

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