Abstract:
To solve the overestimation of
keff in the thermal criticality experiment using CENACE-1.0 data library, the evaluated nuclear data library CENDL-NP-1.0 were validated with several kinds of thermal criticality benchmarks. By analyzing the trends and the relativities among the
keff results, it is found that the direct contributions to the overestimation of
keff calculation results for the metal thermal installation with high uranium enrichment are the(n,f),(n,γ) cross sections and the nubar of 235 U in thermal energy region.