Development of a general framework of resonance self-shielding treatment for broad-spectrum reactor lattice physics calculation

作     者：Zhang, Jinchao Zhang, Qian Zou, Hang Yu, Jialei Cao, Wei Wu, Shifu Qin, Shuai Zhao, Qiang Gilad, Erez 

作者机构：Harbin Engn Univ Fundamental Sci Nucl Safety & Simulat Technol Lab Harbin 150001 Peoples R China Zhejiang Univ Zhejiang Inst Modern Phys Dept Phys Lab Adv Nucl Energy Theory & Applicat Hangzhou 310027 Peoples R China Natl Univ Def Technol Sci & Technol Parallel & Distributed Proc Lab Changsha 410073 Peoples R China Natl Univ Def Technol Lab Digitizing Software Frontier Equipment Changsha 410073 Peoples R China Ben Gurion Univ Negev Unit Nucl Engn POB 653 IL-8410501 Beer Sheva Israel 

出 版 物：《NUCLEAR ENGINEERING AND TECHNOLOGY》 (Nucl. Eng. Technol.)

年 卷 期：2024年第56卷第10期

页      面：4335-4354页

核心收录：

基　　金：National Natural Science Foundation of China Project of Young Talents of China National Nuclear Corporation Science and Technology on Reactor System Design Technology Laboratory grant [K909002-05-FWHT-WU-20234160] 

主　　题：Broad-spectrum Fission spectrum Group structure Subgroup method 

摘      要：Some core designs integrate high-enriched fuel and moderator materials to enhance neutron utilization. This combination results in a broad spectrum within the system, posing challenges in resonance calculation. This paper introduces a general framework to realize resonance self-shielding treatment in broad-spectrum fuel lattice problems. The framework consists of three components. First, a new energy group structure is devised to support resonance calculation in the entire energy range and capture spectral transition and thermalization effects during eigenvalue calculation. Second, the subgroup method based on narrow approximation is selected as a universal method to perform resonance calculation. Finally, transport equations for each fissionable region are solved for neutron flux to collapse the fission spectrum. The proposed method is verified against fast, intermediate, and thermal spectrum pin cell problems and an assembly problem featuring a fast-thermal coupled spectrum. Numerical results affirm the accuracy of the proposed method in handling these scenarios, with eigenvalue errors below 154 pcm for pin cell problems and 106 pcm for the assembly problem. The verification results revealed that the proposed method enables accurate resonance self-shielding treatment for broad-spectrum problems.