Chord length sampling correction analysis for dispersion fuel in Monte Carlo simulation  

作　　者：Zhao-Yu Liang Ding She Yu-Tong Wen Lei Shi 

机构地区：[1]Institute of Nuclear and New Energy Technology(INET),Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education,Tsinghua University,Beijing 100084,China

出　　处：《Nuclear Science and Techniques》2024年第4期57-64,共8页核技术（英文）

基　　金：supported by the CNNC Youth Research Project。

摘　　要：Dispersion fuels,knowned for their excellent safety performance,are widely used in advanced reactors,such as hightemperature gas-cooled reactors.Compared with deterministic methods,the Monte Carlo method has more advantages in the geometric modeling of stochastic media.The explicit modeling method has high computational accuracy and high computational cost.The chord length sampling(CLS)method can improve computational efficiency by sampling the chord length during neutron transport using the matrix chord length?s probability density function.This study shows that the excluded-volume effect in realistic stochastic media can introduce certain deviations into the CLS.A chord length correction approach is proposed to obtain the chord length correction factor by developing the Particle code based on equivalent transmission probability.Through numerical analysis against reference solutions from explicit modeling in the RMC code,it was demonstrated that CLS with the proposed correction method provides good accuracy for addressing the excludedvolume effect in realistic infinite stochastic media.

关 键 词：Stochastic media Monte Carlo Chord length sampling Excluded-volume effect Chord length correction 

分 类 号：TL329.2[核科学技术—核技术及应用] TL352