基于ENDITS-2.1的CENDL-3.2临界基准检验  

Criticality Benchmark Test of CENDL-3.2 Based on ENDITS-2.1

作　　者：吴海成[1] 张环宇[1] WU Haicheng;ZHANG Huanyu(China Nuclear Data Center,China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]中国原子能科学研究院中国核数据中心,北京102413

出　　处：《原子能科学技术》2024年第6期1271-1279,共9页Atomic Energy Science and Technology

摘　　要：中国评价核数据库CENDL-3.2于2020年6月正式发布,并在ND2019上介绍了基于系统化宏观检验工具包ENDITS-1.0的临界基准检验结果。为更广泛测试新评价数据库的临界计算准确度并为将来的评价数据改进提供反馈,中国核数据中心发展了ENDITS-2.1,并用其中2237个来自国际核临界安全手册ICSBEP2006的临界基准实验对国际最新版本的评价核数据库进行了临界基准检验。利用趋势分析方法和统计卡方对检验计算结果进行了分析,确定了获得改进的临界系统和评价数据,确认CENDL-3.2较CENDL-3.1有明显改进,临界计算准确度达国际领先水平。最后,结合对灵敏核素相关统计卡方的分析以及皮尔逊卡方检查,提出了CENDL-3.2库高优先级待改进核素清单,确定了CENDL库需要优先改进235,238U、239,240Pu、232Th等16种核素的核反应数据。The Chinese Evaluated Nuclear Data Library CENDL-3.2 was officially released in June 2020,and the criticality benchmark test results based on the Evaluated Nuclear Data Integral Testing System ENDITS-1.0 were introduced on the ND2019 meeting.At that time,the criticality benchmark test results showed that the CENDL-3.2 library gave the best results compared with ENDF/B-Ⅷ.0,JENDL-4.0 and JEFF-3.3 libraries.In order to further evaluate the quality of the CENDL-3.2 library and provide feedback for future evaluation data improvement,the ENDITS-2.1 was developed with 2237 criticality benchmark experiments adopted from the ICSBEP2006.The CENDL-3.2 library was tested with the extended benchmark test suit and the results were compared with those based on the latest international evaluation nuclear data libraries,including ENDF/B-Ⅷ.0,JEFF-3.3 and JENDL-5.0 libraries,and also compared with the results calculated with the CENDL-3.1 and CENDL-NP-1.3 libraries.During the validation,the ACE libraries for fast neutron were generated with the NJOY 2016 code with the same processing parameters,and the ACE library for thermal neutrons all shared the ENDF/B-Ⅷ.0 library.Firstly,all the benchmark test results were analyzed using the statistical chi-squares and the normalized chi-square values based on ENDITS-1.0 and 2.1 were compared.It was confirmed again by the validation results based on the ENDITS-2.1 that the accuracy of the criticality calculation of the CENDL-3.2 was significantly improved compared with the old version.The chi-square decreases from 14.81 to 8.39 which is a little better than that of ENDF/B-Ⅷ.0 library,which means the accuracy of the criticality calculations for the CENDL-3.2 library reaches the international leading level.At the meantime,one may notice that the critical calculation accuracy ranking of each evaluation library based on the ENDITS-1.0 is consistent with the ranking based on the ENDITS-2.1,which indicates that the selection of benchmark experiments in ENDITS is well representative.Secondly,

关 键 词：评价核数据 临界基准检验 ENDITS-2.1 CENDL-3.2 

分 类 号：TL329.3[核科学技术—核技术及应用] O571[理学—粒子物理与原子核物理]