HFETR碘坑后沿启堆临界棒位的估算

本文研究高通量工程试验堆(HFETR)在碘坑内启动反应堆的问题。首先根据反应堆在碘坑内启堆时碘(135I)和氙(135Xe)浓度随时间变化关系推导出了氙毒引入的反应性随时间变化的解析表达式;接着针对HFETR某炉段进行研究,并结合冷却剂温度效应、燃耗及停堆前的棒位,给出估算碘坑后沿启动反应堆的临界棒位的方法;最后基于MATLAB软件开发用于估算碘坑后沿启动反应堆的临界棒位的程序。

Estimation of Critical Rod Position along the Start-up Reactor after the Iodine Pit of HFETR

In this paper,the start-up of high flux engineering test reactor(HFETR)in iodine pit is studied.Firstly,the analytical expression of the reactivity of xenon with time was deduced according to the timedependent relationship between the concentration of iodine(135 I)and xenon(135 Xe)when the reactor was started in the iodine pit;Then,a furnace section of HFETR is studied,combined with the coolant temperature effect,fuel consumption and the rod position before shutdown,the method of estimating the critical rod position of the start-up reactor along the back of iodine pit is given;Finally,the program for estimating the critical rod position of the start-up reactor along the back of iodine pit is developed based on MATLAB software.