坩埚式堆芯捕集器换热器力学特性分析
Mechanical Property Analysis of the Crucible-type Core Catcher Heat Exchanger
朱光昱 1简丽君 2郭超 1李春 1依岩1
作者信息
- 1. 生态环境部核与辐射安全中心,北京 100082
- 2. 中国核电工程有限公司,北京 100840;清华大学 工程物理系,北京 100084
- 折叠
摘要
基于田湾核电厂堆芯捕集器的设计参数,采用COMSOL软件搭建了一个多物理场耦合仿真模型,对核电厂严重事故初期阶段,坩埚式堆芯捕集器的运行情况进行了数值模拟研究.结果表明,当牺牲材料与堆芯熔融物混合后形成的熔融池温度超过 2 100K时,换热器底部钢壳会发生熔化,少量的熔化不会对堆芯捕集器的力学性能产生明显影响.此外,换热器竖直壁面中心区域会的热膨胀量较大,会对外部冷却流道造成明显的挤压.结合上述计算结果,对坩埚式堆芯捕集器的换热器设计提出了建议,为相关设备的研发奠定了基础.
Abstract
Based on the design of the core catcher in Tianwan NPP,a multi-physical coupling simulation model is built by the COMSOL software to simulate the operation of the crucible type core catcher in the initial stage of severe accidents in nuclear power plant.The results show that the bottom steel shell of the heat exchanger will melt.When the temperature of the corium formed by mixing the sacrificial material with the core melt exceeds 2100 K,a small amount of melting does not have a significant effect on the mechanical properties of the core catcher.In addition,the heat expansion in the central area of the vertical wall is very large,which will cause significant extrusion on the external cooling channel.Based on the above results,this paper proposes suggestions on the design of the crucible type core catcher and lays the foundation for the development of related equipment.
关键词
严重事故/堆芯捕集器/COMSOLKey words
Severe accident/Core catcher/COMSOL引用本文复制引用
基金项目
十三五核能开发科研第六批项目(科工二司[2020]1192号)
出版年
2024
NETL
NSTL
万方数据