IVR策略下一回路晚期再注水压力风险分析

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

Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, 610213, China

摘要: 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。
- 严重事故 /
- 堆内熔融物滞留（IVR） /
- 一回路注水
Abstract: 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.
- Severe accident /
- In-Vessel Retention (IVR) /
- Primary circuit injection

图 1 方案1压力容器内压力

Figure 1. Pressure in Pressure Vessel for Scheme 1

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图 2 方案1下封头熔融物质量

Figure 2. Mass of Lower Head Melt for Scheme 1

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图 3 方案1下封头熔融池整体温度

Figure 3. Overall Temperaure of Lower Head Melting Pool for Scheme 1　　　　　　

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图 4 方案1下封头内气体温度

Figure 4. Gas Temperature of Lower Head for Scheme 1

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图 5 方案 a~g压力容器内压力示意图

Figure 5. Schematic Diagram of Pressure in Pressure Vessel of Schemes a~g

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表 1 方案a~g的压力容器内压力峰值

Table 1. Pressure Peak of Pressure Vessel of Schemes a~g

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表 2 方案d1~d4的压力容器内压力峰值

Table 2. Pressure Peak of Pressure Vessel of Schemes d1~d4

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表 3 方案d、方案d5的压力容器内压力峰值

Table 3. Pressure Peak of Pressure Vessel of Scheme d/d5

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