Study on Reactivity Disturbance Characteristics of SCO2 Reactor Assembly Caused by Burnable Poisons
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摘要: 为探究可燃毒物对超临界二氧化碳反应堆组件反应性扰动特性,以得出稳定安全的反应性控制方法。本文提出了2类7种不同的可燃毒物布置模型,通过研究不同可燃毒物装载下组件的反应性变化,针对不同布置得出了通过调节可燃毒物消耗速度的反应性控制方法:①通过混合棒的聚集排布;②在一定的排布形式以及装载量下可以通过调节H配比,可以很好地实现反应性控制,如采用10B丰度为3%的B4C可燃毒物装载,H配比为17.5时,反应性波动仅为2600pcm(1pcm=10−5)。得到了可燃毒物对超临界二氧化碳反应堆组件反应性扰动影响规律,提出了反应性控制方法。Abstract: In order to investigate the reactivity disturbance characteristics of supercritical CO2 reactor assemblies caused by burnable poisons and to obtain a stable and safe reactivity control method, this paper puts forward 7 different burnable poison arrangement models of 2 categories. By studying the reactivity changes of assemblies under different burnable poison loading, the reactivity control methods by adjusting the consumption rate of burnable poisons are obtained according to different arrangements: 1) through the aggregation arrangement of mixing rods; 2) the reactivity can be well controlled by adjusting the H-ratio under a certain arrangement form and loading quantity. For example, when B4C burnable poison with 10B enrichment of 3% is loaded with the H ratio of 17.5, the reactivity fluctuation is only 2600 pcm (1 pcm = 10−5). The influence of combustible toxicant on the reactivity perturbation of supercritical CO2 reactor assembly is obtained and the reactivity control method is proposed.
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Key words:
- Reactivity /
- Burnable poison /
- Supercritical CO2 /
- Gas-cooled reactors
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表 1 几种可燃毒物核素性质
Table 1. Burnable Poison Nuclide Properties
分类 类型一 类型二 类型三 可燃毒物 B4C Gd2O3 Er2O3 中子吸收体 10B 155Gd、157Gd 167Er 天然丰度/% 19.8 14.71、15.68 22.87 0.0253 eV吸收截面/10−28 m2 3839 60799、254070 647 共振吸收截面/10−28 m2 - 1447+100、700+20 2970+70 密度/( g·cm−2) 2.52 7.40 8.64 -
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