HTR-10初装堆芯及过渡过程物理计算分析

Physics calculation and analysis for HTR 10 initial core and running in phase

选取石墨球与燃料球均匀混合作为１０ＭＷ高温气冷堆（ＨＴＲ－１０）的初始装料方案，利用高温堆物理模拟程序ＶＳＯＰ及二维ＳＮ程序，分析计算了初始装料时ＨＴＲ－１０堆芯进水反应性效应、控制棒及第二停堆系统反应性当量，研究了初装堆向平衡态过渡过程中的临界性、单球最大功率、最大比燃耗等变化情况。结果表明：ＨＴＲ－１０初装堆的进水反应性效应比平衡态小；控制棒及第二停堆系统反应性当量比平衡态的大。但是，初装堆冷态下反应性控制系统当量裕量比平衡态小；过渡过程中有效增殖因数在很小范围内变化，燃料最大比燃耗不超过１００ＧＷｄ／ｔ。

The homogenous mixture of spherical graphite and spherical fuel element is chosen as the initial core loading for 10 MW high temperature gas cooled reactor (HTR 10). Using the high temperature gas cooled reactor physics simulation code VSOP and the two dimensional SN code, the effects on reactivity due to water ingress and the reactivity equivalence of control rods and second reactor shutdown system were analyzed and calculated. For the running in phase from the initial core to the equilibrium state, the variable histories of the criticality, the peak power of single sphere, and the peak specific burnup of fuel were studied. The results show that: for HTR 10 initial core, the effect on reactivity due to the water ingress is less than that under equilibrium core; the reactivity equivalence of control rods and second reactor shutdown system is greater than that of equilibrium core, but under the cool state, the surplus of reactivity equivalence of control rod and second reactor shutdown system is less than that of equilibrium core; during the running in phase, the value of k eff (effective multiplication factor) varies within narrow range and the peak specific burnup of fuel does not exceed 100 GWd/t.