【摘要】 氟盐冷却球床高温反应堆(Pebble Fluoride-Salt-Cooled High Temperature Reactors,PB-FHR)的冷却剂温度反应性系数与其堆芯活性区的几何尺寸有直接关系,研究选取7Li摩尔含量为99.995%的2Li F-Be F2做冷却剂,对冷却剂温度反应性系数与PB-FHR的堆芯活性区体积的关系进行定量分析。利用SCALE5.1软件对不同堆芯活性区体积的PB-FHR的冷却剂温度反应性系数进行了研究。分析结果表明:堆芯活性区体积越大的PB-FHR,冷却剂温度反应性系数越趋于正值,堆芯活性区体积越小的PB-FHR,冷却剂温度反应性系数越趋于负值。基于四因子公式的分析表明,逃脱共振俘获的概率、不泄漏概率和热中子利用系数在不同堆芯活性区体积的PB-FHR内的差异是影响冷却剂温度反应性系数差异的主要原因。更多还原

【Abstract】 Background:The coolant temperature reactivity coefficient(CTRC) of the pebble fluoride-salt-cooled high temperature reactors(PB-FHR) is closely related to the core volume.Purpose:The relationship between the core volume of PB-FHR with 2Li F-Be F2(7Li concentration:99.995%) as coolant and the CTRC values are quantitatively analyzed.Methods:The CTRCs of FHR with different core volumes were calculated with the computer code KENO in SCALE5.1.Results:CTRC increases from negative to positive as the core volume increases from 2 m3 to an infinite value.Conclusion:Based on the analysis of the four factor formula,the different CTRC values with variant core volume can be attributed to the influence of the leakage probability,non-leakage probability and thermal utilization factor.更多还原