岷江试验堆低浓化后堆内反应性变化分析

Analysis for Core Reactivity of Reduced Enrichment MJTR

岷江试验堆(MJTR)使用低浓燃料后,堆芯装载发生变化。本文根据低浓化后各种堆芯参数的改变,分析计算了135Xe与149Sm这2种反应堆中最重要裂变产物的变化对堆芯反应性产生的影响,并给出额定工况运行与停堆后2种情况下的反应性变化曲线,使反应堆操纵人员了解毒物反应性的变化规律,以便于在实际运行中应对工况变化,保证反应堆正常安全运行。

After the use of low-enrichment fuel in MJTR, the loading of the core has been changed. The core parameters are used to calculate the change rule of 135 Xe and 149 Sm, and the effect on the core reactivity. Then the curves of core reactivity in nominal operating condition and shut down condition are given, which makes the operator understand the change rule of toxic reactivity and response to the change of working condition in actual operation and ensure the safe operation of the reactor.