Analysis of the coolant reactivity coefficients of FHRs with 6Li contents of coolant

SUN Jianyou; ZOU Yang; YAN Rui; ZHU Guifeng; LI Guangchao; CHEN Liang; LI Dongcang; XU Hongjie

doi:10.11889/j.0253-3219.2014.hjs.37.090605

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Analysis of the coolant reactivity coefficients of FHRs with 6Li contents of coolant

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- Analysis of the coolant reactivity coefficients of FHRs with 6Li contents of coolant
- NUCLEAR TECHNIQUES Vol. 37, Issue 9, Article number: 090605(2014)
- 作者机构：
  
  1. 中国科学院上海应用物理研究所嘉定园区,上海,201800
  2. 兰州大学核科学与技术学院,兰州,730000
  3. 中国科学院核辐射与核能技术重点实验室,上海,201800
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2014.hjs.37.090605
  CLC：
- Published：09 September 2014
- 稿件说明：
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SUN Jianyou, ZOU Yang, YAN Rui, et al. Analysis of the coolant reactivity coefficients of FHRs with 6Li contents of coolant[J]. Nuclear techniques, 2014, 37(9): 090605
DOI：

SUN Jianyou, ZOU Yang, YAN Rui, et al. Analysis of the coolant reactivity coefficients of FHRs with 6Li contents of coolant[J]. Nuclear techniques, 2014, 37(9): 090605 DOI： 10.11889/j.0253-3219.2014.hjs.37.090605.

摘要

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 (Standardized Computer Analyses for Licensing Evaluation)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。

Abstract

Background: The 6Li in the coolant 2LiF-BeF2 of Fluoride-Salt-Cooled High Temperature Reactors

one type of generation IV

has a large microscopic thermal neutron absorption cross section. Purpose: The impact of 6Li concentration on the coolant temperature reactivity coefficient of Fluoride-Salt-Cooled High Temperature Reactors is reached. Methods: The coolant temperature reactivity coefficient was performed for Fluoride-Salt-Cooled High Temperature Reactors with different 6Li molar compositions of 2LiF-BeF2 as coolants by using the computer codes KENO in SCALE6 (Standardized Computer Analyses for Licensing Evaluation). Results: The neutron absorptive capability of 6Li in the coolant equals to that of 7Li when the 6Li mole content is 0.005%. The results are given that the coolant temperature reactivity coefficient is changing from negative value to positive value with increasing of the 6Li molar compositions of 2LiF-BeF2. Conclusion: Based on the analysis of the four factor formula

it can be concluded that the change of the thermal utilization coefficient mainly accounts for the increase of coolant temperature coefficient of reactivity.Cited

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