Relative consistency of ENDF/B-IV and -V with fast-reactor benchmarks

The consistency of eleven selected fast-reactor and two neutron-field integral experiments with the ENDF/B-IV and -V libraries was examined by considering contributions to chi-square. Integral measurements least consistent with each given library were identified one at a time, and the particular cross sections which were significantly adjusted at each step were also identified. The results of this analysis demonstrate that, with respect to twelve out of the thirteen integral measurements considered, ENDF/B-V is a marked improvement over Version IV in the sense that (a) the integral data are significantly more consistent with Version V than with Version IV, (b) fewer cross sections need to be adjusted to achieve agreement between all the experimental data and the corresponding values calculated by Version V, and (c) the necessary adjustments are smaller.