IVR策略下一回路晚期再注水压力风险分析

参考某百万千瓦级核电厂设计，针对堆内熔融物滞留（IVR）策略投入后晚期（即压力容器下封头已形成熔融池的情况下）可能的一回路再注水场景开展分析，研究晚期再注水的一回路压力响应。通过与不实施再注水事故工况的对比分析，综合评估实施再注水时间、再注水流量及严重事故泄压阀开启数量对一回路的压力影响，得到了各措施的影响规律，并针对严重事故管理策略提出建议。 

Risk Analysis of Late Reinjection Pressure in the Primary Circuit under IVR Strategy

Based on the design of a million-kilowatt nuclear power plant, this article analyzed the possible late primary circuit reinjection scenarios in severe accidents when the In-Vessel Retention (IVR) measure is taken (that is, when the lower head of the pressure vessel has formed a melting pool), and studied the primary circuit pressure respond to the late reinjection. Through the comparative analysis of the condition with no reinjection, the influence of reinjection time, reinjection flow and the opening number of pressure relief valves in serious accidents on the pressure of the primary circuit were comprehensively evaluated, the influence law of each measure was obtained, and suggestions were put forward for severe accident management strategies.