CENDL-3.1铜的检验和改进

介绍了利用屏蔽基准实验OKTAVIAN以及核临界安全手册(ICSBEP)中的临界基准实验对CENDL-3.1铜的伞套中子评价数据进行的宏观检验.在屏蔽基准检验中,除了中子和γ泄漏谱上发现了由非弹性散射截面造成的与实验测量结果的分歧,计算结果与实验符合相当好.在快中子谱临界基准检验中,装置HMF072、HMF073和PMF013的keff的计算结果高出实验值大约2%,严重偏离实验结果.针对HMF072装置的灵敏度分析显示,该分歧的产生主要是由于全截面在0.1～1.3 MeV能区的评价不当引起的.在对0.1～1.3 MeV的全截面进行修正后,临界检验的结果获得了明显改善.

Benchmark testing and improvement for copper evaluation of CENDL-3.1

The validation of n + Cu evaluation for CENDL-3. 1 is performed with the shielding benchmark OKTAVIAN and criticality benchmarks from ICSBEP. For shielding benchmark, generally good results are obtained based on the present evaluations, except for some discrepancy caused by inelastic scatting cross sections found in the analysis of the neutron and gamma leakage current. For fast criticality benchmarks, the predictions of the k_(eff)-value results are quite poor. Overestimation the C/E values of the k_(eff) for about 2% have been found in the calculations of benchmark HMF072, HMF073 and PMF013. Sensitivity analysis performed with the case HMF072 shows the bias of k_(eff) is mainly caused by the total cross section around 0. 1～1. 3 MeV. After small modifications done to the total cross section, much better prediction of the k_(eff) values has been achieved.