中国实验快堆堆坑在丧失外电源事故下的温度分布数值模拟

摘要

堆坑是中国实验快堆(CEFR)的重要组成部分,它采用通风冷却的方法来降低堆坑混凝土温度,防止其温度过高、脱水而导致支撑堆容器的力学性能降低.本文对丧失外电源事故下的堆坑内部温度分布进行了二维数值模拟,采用Jones-Launder的k-ε低Reynolds数湍流模型.得到了堆坑温度场、保温层外壁和混凝土内壁在竖直方向的温度分布、混凝土内壁最高位置温度随时间的变化,为CEFR运行提供参考.%Reactor pit is the important component of CEFR.The pit concrete is cooled by the ventilation in order to avoid concrete high temperature and then dehydration.That leads to concrete strength deterioration and cannot support the reactor vessel.This paper studied the two-dimension numerical simulation of reactor pit temperature distribution in the accident of power supply failure.The Jones-Launder low-Reynoldsnumber k-ε turbulent model is accepted.The temperature distribution of reactor pit,the temperature distribution of the outer insulation wall and inner concrete wall in the vertical direction and the change of inner concrete wall temperature in the highest spot with the time are obtained.These solutions are useful to the operation of CEFR.