可燃毒物布置方式的反应性波动特性研究

Research on Reactive Fluctuation Characteristics of Burnable Poison Arrangement

不同可燃毒物的布置方式可以控制整个燃耗寿期下的反应性波动并且可以提高燃耗深度。本工作在不同富集度下分析可燃毒物的布置方式对堆芯反应性的影响。并对堆芯keff在整个燃耗寿期下的变化趋势进行分析。结果表明1)含可燃毒物B和Gd的堆芯,采用16根可燃毒物棒的布置方式;含可燃毒物Er和Eu的堆芯,采用28根可燃毒物棒的布置方式;含可燃毒物231Pa、240Pu和241Am的堆芯,采用组件燃料棒中均含可燃毒物的布置方式。2)在14%富集度下选用240Pu作为可燃毒物;在40%、70%和97%富集度下选用B作为可燃毒物。

The arrangement of different burnable poisons can control the reactivity fluctuations throughout the burnup life and can achieve the deepest burnup depth.This work analyzes the reactivity fluctuation characteristics of different burnable poison arrangements under different enrichment levels.The change trend of k eff over the entire burn-in life is analyzed.The results show that:1.The core containing burnable poisons B and Gd can easily adopt the arrangement of 16 burnable poison rods;the core containing burnable poisons Er and Eu can easily adopt the arrangement of 28 burnable poison rods;the core containing burnable poisons of 231 Pa,240 Pu and 241 Am are easy to adopt the arrangement of burnable poisons in the fuel rods of the components.2.Select 240 Pu as combustible poison under 14%enrichment;select B as combustible poison under 40%,70%and 97%enrichment.