弥散颗粒系统双重非均匀性物理边界研究  

Research of Double-Heterogeneity Physical Boundary on Dispersed Particle-type Systems

作　　者：娄磊[1] 柴晓明[1] 姚栋[1] 李满仓[1] 陈亮[1] 刘晓黎[1] 张宏博 李司南 唐霄[1] 周楠 Lou Lei;Chai Xiaoming;Yao Dong;Li Mancang;Chen Liang;Liu Xiaoli;Zhang Hongbo;Li Sinan;Tang Xiao;Zhou Nan(Science and Technology on Reactor System Design Technology Laboratory,Nuclear Power Institute of China,Chengdu,610213,China)

机构地区：[1]中国核动力研究设计院核反应堆系统设计技术重点实验室,成都610213

出　　处：《核动力工程》2021年第S02期82-88,共7页Nuclear Power Engineering

基　　金：国家自然科学基金(1170051016)。

摘　　要：弥散颗粒系统由于双重非均匀性而无法用传统中子学计算程序描述,直接采用体积均匀化方法处理会带来反应性计算偏差。本文通过分析弥散颗粒燃料及不同类型弥散颗粒可燃毒物的体积均匀化反应性计算偏差及其与光学长度的关系,提出将计算偏差的影响因素整合为修正光学长度,提出了弥散颗粒系统双重非均匀性的物理边界,当修正光学长度大于10^(−4)时,体积均匀化方法的反应性计算偏差将大于100pcm(1pcm=10^(−5)),需要考虑弥散颗粒系统的双重非均匀性。Dispersed particle-type systems cannot be described with traditional neutronics calculation programs because of the double-heterogeneity(DH),and the direct use of Volumetric Homogenization Method(VHM)will bring reactivity calculation deviation.In this paper,by analyzing the calculation deviation of volumetric homogenization reactivity of dispersed particle fuel and different types of dispersed particle burnable poison and its relationship with optical length,it is proposed that the influence factors of calculation deviation shall be integrated into corrected optical length.The physical boundary of double-heterogeneity of dispersed particle-type system is proposed.When the corrected optical length is greater than 10^(-4),the reactivity calculation deviation of the volumetric homogenization method will be more than 100pcm,so the double-heterogeneity of the dispersed particle-type system needs to be taken into account.

关 键 词：弥散颗粒系统 双重非均匀性 物理边界 体积均匀化 反应性计算偏差 光学长度 修正光学长度 

分 类 号：TL32[核科学技术—核技术及应用]