基于溶液实验的堆芯物理多群常数库临界基准检验方法  

Criticality Benchmarking Method of Core Physical Multi-groupConstant Library Based on Solution Experiment

作　　者：陈莹 吴海成[1] 温丽丽[1] 吴小飞[1] 肖越 唐辉 CHEN Ying;WU Haicheng;WEN Lili;WU Xiaofei;XIAO Yue;TANG Hui(China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]中国原子能科学研究院,北京102413

出　　处：《原子能科学技术》2024年第5期1069-1075,共7页Atomic Energy Science and Technology

基　　金：核数据重点实验室基金(JCKY20231C153-3)。

摘　　要：堆芯物理多群常数库为反应堆计算程序的中子学计算提供多群截面数据以及燃耗数据,是反应堆物理计算的重要前提。目前国际上对多群数据库的验证通常将待验证的多群数据库耦合组件计算程序通过对临界基准实验进行模拟计算的方式来进行,各组件计算程序由于几何处理方法的局限无法对球形装置进行建模,因此尚未有基于球形临界基准实验对多群常数库进行基准检验的方法。本文提出了一种裸球形实验装置的模型建立方法,大幅增加临界基准检验使用的基准实验选择范围,同时基于国际核临界安全手册(ICSBEP2006)挑选了不同能谱指标下的49个铀、钚溶液实验对中国核数据中心研制的堆芯物理多群常数库进行临界基准检验,并给出了不同能谱指标下基准实验的参考结果范围。本文结果可扩大堆芯物理多群常数库基准检验规模和覆盖范围,有助于高保真堆芯物理计算程序准确性的进一步提升。The calculation of neutron physics in nuclear reactors is the most basic research content in the design and safety analysis of nuclear reactor systems,and the accuracy and confidence of the calculation results directly affect the evaluation of the safety and economy of nuclear reactors.The core physics multi-group constant library provides cross-section data and burn-up data for the calculation of neutron physics of nuclear reactors,which is the basis and guarantee of reactor physical calculation,and the accuracy of multi-group constant data in the core physics library directly affects the accuracy of reactor physical calculation and reactor design.At present,the international verification of multi-group constant library is usually carried out by simulating the critical experiments of the multi-group constant library coupling lattices calculation codes to be verified.The critical experiments in the International Handbook on Nuclear Criticality Safety(ICSBEP)are an important means to verify the accuracy and reliability of the nuclear library and neutron transport calculation codes,and the uranium and plutonium solution experiments with pure nuclide content and sensitive 1H/235 U ratio under different spectral indexes in the ICSBEP are very suitable for verifying the data of the scattering cross section,the capture cross section of 1H,and the fission spectrum and absorption cross section of the 235 U,238 U,239 Pu,240 Pu and other nuclide thermal energy points in the multi-group constant library.The critical experiments in ICSBEP are all three-dimensional experiments,and the two-dimensional modeling of the three-dimensional experimental setup is one of the keys to the verification of the multi-group constant library of core physics,and the accuracy of the model directly affects the accuracy of the verification results.Due to the limitations of the geometric processing method,the calculation code of each component cannot model the spherical device,so there is no benchmark method for the multi-group constant library b

关 键 词：多群常数库 国际核临界安全手册 溶液实验 临界基准检验 

分 类 号：TL329.3[核科学技术—核技术及应用]