Integral Data Testing of ENDF/B-VII.1 Files - Success Stories and Need to Improve Stories

We review the results of ENDF/B-VII.1 cross section data testing with International Criticality Safety Benchmark Evaluation Project (ICSBEP) benchmark assemblies. Comparisons with the previous, ENDF/B-VII.0, file are made, noting where the new data perform better and also noting areas of continuing weakness that require further experimental and theoretical work.