西安脉冲堆氙、钐反应性分析

Analysis of Xenon and Samarium Reactivity for Xi'an Pulse Reactor

对西安脉冲堆裂变产物中毒进行了深入地分析研究。利用脉冲堆物理计算程序计算了西安脉冲堆在不同功率下停堆前后氙(135Xe)和钐(149Sm)反应性变化,得到氙毒和碘坑的计算值,并与实测值进行了比较。结果表明,理论计算值与实测值符合较好, 特别是碘坑值,二者只相差5.7×10-5。碘坑反应性值较小,不会影响启动,即西安脉冲堆停堆后,随时都可以安全启动。

The fission product poisoning of Xi'an pulse reactor is analysed deeply. At different power, the changes of reactivity of xenon and samarium before and after shutdown for Xi'an pulse reactor are calculated by using physical program. As well the results of calculations and measurements for xenon poison and iodine pit are compared in this paper. They are very similar, particularly, the difference of Iodine pit between them only is 5.7×105. Owing to the reactivity of Iodine pit is very small, so Xi'an pulse reactor can be started at any time after shutdown.