The station blackout accident is clearly a very serious problem that jeopardizes the safety barrier of nuclear reactor and ascends the core integrity steeply. The dual-cooled annular fuel has been introduced to boost the generated power density and safety margins. The fuel is cooled both internally and externally by allowing the liquid to flow on inner and outer heated surfaces. The fuel peak temperature can be reduced substantially by decreasing the fuel rod cladding heat flux leading to an increment on the DNBR. In this paper, a dual cooled annular fuel a VVER-1000 is investigated in this accident scenarios. The deployment of portable pumps for injecting coolant to dual cooled annular fuel core to mitigate this accident is also considered. The effect of accident tolerant fuel rod cladding is also investigated. The RELAP5 model is used to model the annular fuel to perform the analysis. The results are compared to traditional solid fuel geometry.

车站停电事故显然是一个非常严重的问题，危及核反应堆的安全屏障，并急剧提高堆芯的完整性。引入了双冷却环形燃料以提高产生的功率密度和安全裕度。通过使液体在内部和外部加热表面上流动，可对燃料进行内部和外部冷却。通过减少导致DNBR增大的燃料棒包壳热通量，可以大大降低燃料峰值温度。在这种事故情况下，本文研究了双冷却环形燃料VVER-1000。还考虑了部署便携式泵，以将冷却剂注入双冷却环形燃料芯，以减轻这种事故。还研究了耐事故的燃料棒包层的效果。RELAP5模型用于对环形燃料建模以执行分析。将结果与传统的固体燃料几何形状进行比较。