Effect of Check Valve on Consequences of Coolant Pump Rotor Seizure Accident for EPR Reactor
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摘要: 分析计算欧洲先进压水堆(EPR)反应堆主泵卡轴事故,并对比在主泵出口安装止回阀和没有安装止回阀模型的卡轴事故安全分析。结果表明,在EPR主泵卡轴事故中,止回阀可增加模型堆芯进口流量约4%,有利于堆芯的冷却。止回阀可显著地提高堆芯最小偏离泡核沸腾比(DNBR),降低堆芯偏离泡核沸腾(DNB)份额,降低包壳温度约14℃。模型分析结果表明,在主泵卡轴事故工况下,主泵出口安装止回阀可更好地维持堆芯的完整性。Abstract: Counter current flow phenomenon would appear during reactor coolant pump rotor seizure accident.Present work analyzes the coolant pump rotor seizure accident for European Pressurized Reactor（EPR）.The accident safety analysis results of model with check valve and without check valve are compared.It can be found that the check valve can increase the core inlet flow rate of model about 4%.The increasing of coolant flow rate is beneficial to the reactor core cooling.Check valve can increase the minimum departure from nucleate boiling ratio（DNBR）,reduce the departure from nucleate boiling（DNB） fraction and the fuel rod cladding temperature about 14℃ during coolant pump rotor seizure accident.The analyses results show that the model with check valve can maintain the integrity of nuclear fuel rod effectively during reactor coolant pump rotor seizure accident.
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Key words:
- Nuclear reactor /
- Coolant pump rotor seizure accident /
- Safety analysis /
- Check valve
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