分群结构对IHNI-1堆动态参数计算结果的影响研究

基于WIMS和CITATION程序的计算结果,编制了动态参数计算程序CKPWC(calculating kinetic parameters based on WIMS and CITATION),对医院中子照射器Ⅰ型堆(in-hospital neutron irradiator mark 1 reactor,IHNI-1)的动态参数计算进行了研究.首先使用WIMS计算出均匀化栅元截面以及69群通量,再使用CITATION进行四群扩散计算,最后编制动态参数计算程序,计算了IHNI-1动态参数(缓发中子有效份βeff和中子代时间Λ).经过比较研究发现,分群结构对动态参数的计算结果有很大的影响.给出了计算IHNI-1缓发中子份额和中子代时间的最佳四群分群结构.使用文章中的最佳分群结构思想对西安脉冲堆动态参数进行了验证计算,计算结果与设计值符合一致,说明给出的IHNI-1动态参数计算结果具有一定的可信性.

The effect of group structure on calculation of kinetic parameters of in-hospital neutron irradiator mark 1 reactor

The kinetic parameters of in-hospital neutron irradiator mark 1(IHNI-1) reactor,effective delayed neutron fraction and neutron generation time are calculated by CKPWC(calculating kinetic parameters based on WIMS and CITATION)program based on the calculated results of WIMS and CITATION.The cell homogenized cross section and 69-group flux density are calculated by WIMS.Flux density and adjoint flux density are obtained based on 4-group diffusion calculation using CITATION.The kinetic parameters are calculated by CKPWC based on the results of WIMS and CITATION.The analysis based on the calculation indicates that the energy group structure has a significant effect on the result of kinetic parameter.An appropriate energy group structure is given in this paper.To verify the accuracy of the method,Xi’an Pulsed Reactor is benchmarked and the result is corresponded to its design value.