可燃毒物对超临界二氧化碳反应堆组件反应性扰动特性研究

Study on Reactivity Disturbance Characteristics of SCO_(2) Reactor Assembly Caused by Burnable Poisons

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。

In order to investigate the reactivity disturbance characteristics of supercritical CO_(2)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 CO_(2)reactor assembly is obtained and the reactivity control method is proposed.