CFR600乏组件转换桶内氩气空间三维传热数值模拟

Three-dimensional Heat Transfer Numerical Simulation of Argon Space in CFR600 Spent Subassembly Transfer Pot

利用商业计算流体力学程序STAR-CCM+,对中国示范快堆(CFR600)乏组件转换桶内的氩气空间及相关结构部件进行数值模拟计算,验证分析正常工况和事故工况下的预埋件的热工设计。研究结果表明,正常工况下预埋件的温度峰值满足设计限值要求,但预埋件的温度分布存在一定程度的不均匀性,并且当发生事故工况时温度分布的差异性明显增大。钠液面通过辐射换热和对流换热共同对设备构件产生影响,其中辐射换热起主要作用。对于钠液面辐射换热的主要决定因素为钠液面的发射率。本工作为乏组件转换桶的正常运行及安全分析提供了技术准备。

The argon space and related structural components of the spent subassembly transfer pot of the China Demonstration Fast Reactor(CFR600) was investigated by computational fluid dynamics program STAR-CCM+, and the thermal design of the concrete was verified at normal conditions or accident conditions. The research results show that the maximum temperature of concrete under normal condition meets the design limit requirements, but the temperature distribution of concrete is not uniform in the circumferential direction, and the temperature distribution become non-uniformly highly at accident conditions. The radiation heat transfer and convection heat transfer together affect the components of the equipment, in which the radiation heat transfer plays a major role. The emissivity of sodium surface is the main determinant of radiation heat transfer. The results provide technical preparation for operation and safety analysis of spent subassembly transfer pot.