Application of homogenization techniques for inflow transport approximation on light water reactor analysis

• 作者: Xiang Xiao Kan Wang Tong-Rui Yang Yi-Xue Chen
• 来源期刊: 核技术（英文版）
• 年，卷（期）: 2022,（1）
• 所属期刊栏目: NUCLEAR ENERGY SCIENCE AND ENGINEERING
• 页码范围: 67-80
• 页数: 14页
• 语种: 英文

摘要

The transport cross-section based on inflow transport approximation can significantly improve the accuracy of light water reactor (LWR) analysis,especially for the treatment of the anisotropic scattering effect.The previous inflow transport approximation is based on the moderator cross-section and normalized fission source,which is approximated using transport theory.Although the accuracy of reactivity is increased,the Po flux moment has a large error in the Monte Carlo code.In this study,an improved inflow transport approximation was introduced with homogenization techniques,applying the homoge-nized cross-section and accurate fission source.The numerical results indicated that the improved inflow transport approximation can increase the Po flux moment accuracy and maintain the reactivity calculation precision with the previous inflow transport approximation in typical LWR cases.In addition to this investigation,the improved inflow transport approximation is related to the temperature factors.The improved inflow transport approximation is flexible and accurate in the treatment of the anisotropic scattering effect,which can be directly used in the tem-perature-dependent nuclear data library.