压水堆一回路冷却剂氚源计算影响因素分析

Analysis of Influence Factors on Tritium Source Calculation in Primary Coolant System for PWR

根据氚在反应堆一回路系统的产生和消减过程,建立氚源计算模型,采用保守计算方法和基于硼锂协调曲线的计算方法,对比硼、锂产氚量的差异,并分析释放份额、初始硼浓度、硼去除率、初始锂浓度对一回路氚源计算的影响。结果表明:两种计算方法对硼、锂产氚量的影响很大,保守方法和基于硼锂协调曲线的计算方法得到的硼、锂产氚量比值分别为1.39和2.04。氚活度随释放份额、初始硼浓度、锂浓度的增大而增大,随硼去除率的增大而减小。

Tritium has a long half-life period and has a great contribution to the collective dose,so it is receiving more and more attention in environmental impact assessment.In this paper,based on the mechanism of tritium production and reduction,the tritium source calculation model was established.The conservative calculation method and the boron-lithium coordination curve method were used to compare the differences of tritium produced by boron and lithium.The effect of tritium release fraction,initial boron concentration,boron removal rate and initial lithium concentration on the tritium source in primary coolant system was analyzed.The results showed that the two methods had a great influence on the amount of tritium produced by boron and lithium.The ratio of tritium produced by boron using the conservative method and the boron-lithium coordination curve method was 1.39,and that by lithium was 2.04.Tritium activity increased with the release fraction,initial boron concentration and lithium concentration increasing,and decreased as boron removal rate increased.