对CANDU燃料组件结构的一维瞬态辐射程序开发与验证

Development and Verification of a One Dimensional Transient Radiation Code for CANDU Fuel Assembly

在气冷CANDU式燃料组件之中,辐射换热也是不容忽视的一部分。特别是在出现了系统失压/失流事故时,辐射换热将会成为保证燃料安全的主要冷却手段。本文中针对CANDU式压力管编制了针对压力管几何条件下的一维辐射换热瞬态程序。程序中采用将燃料元件棒转化为同心圆环的方式简化辐射角的计算,并加入了隔层辐射模型,使模型更加贴近实际。采用分别将程序中的几个模块的计算结果与CFX计算结果对比的方式来达到程序验证的目的,验证结果显示程序RHTPB具有良好的表现,能够满足于反应堆安全计算的需要。

In the Gas-cooled CANDU kind fuel assemble,radiation heat transfer cannot be ignore.Expertly during the LOFA accidents,with no convection heat transfer,the radiation heat transfer will become the main force to ensure the safety of the reactor.This paper developed a one dimensional transient radiation code to calculate the radiation heat transfer in CANDU fuel assembly.The code assumes that the fuel element rings can be lumped into several circular rings,which can simplify the calculation of radiation angle factors.And with the purpose of making the models closer to the actual situation,radiation between next nearest neighbor layers is also considered in addition to that between nearest neighbor layers.The radiation model,transient radiation calculation and steady radiation calculation of the code RHTPB are verified by comparing with result of CFX,respectively.The result shows that the code has good performance in transient radiation calculation,and can satisfies the need of nuclear industry.