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核技术  2014 

球床氟盐冷却高温堆中6Li摩尔浓度对冷却剂温度反应性系数影响的研究

DOI: 10.11889/j.0253-3219.2014.hjs.37.090605, PP. 90605-90605

Keywords: 无限球床,6Li摩尔含量,宏观吸收截面,四因子,温度反应性系数

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Abstract:

球床氟盐冷却高温反应堆作为第四代反应堆,选用2LiF-BeF2做冷却剂。2LiF-BeF2中含有微观吸收截面很大6Li核素,其摩尔含量会对冷却剂的温度反应性系数造成影响,因此研究6Li摩尔含量对冷却剂温度反应性系数的影响十分必要。本文以无限球床为计算模型,利用SCALE6(StandardizedComputerAnalysesforLicensingEvaluation)对不同6Li摩尔含量的冷却剂温度反应性系数进行研究。分析结果表明,当冷却剂中6Li摩尔含量占Li元素总量的0.005%时,冷却剂中6Li和7Li的宏观吸收截面大致相当;随着6Li摩尔含量的增大,冷却剂的温度反应性系数由负向正转变,并逐渐增大;基于四因子公式的分析表明,引起冷却剂的温度反应性系数由负变正的主要因素为热中子利用系数的变化。

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