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Development and Testing of ENDF/B-VI.8 and ENDF/B-VII.0 Coupled Neutron-Gamma Libraries for SCALE 6 (NUREG/CR-6990, ORNL/TM-2008/047)

Publication Type
Technical Report

New coupled neutron-gamma shielding libraries have been developed for use with the SCALE (Standardized Computer Analyses for Licensing Evaluation) code system. Two libraries have been generated based on the Evaluated Nuclear Data File/B Version VI (ENDF/B-VI) Release 8 (ENDF/B-VI.8) and ENDF/B-VII Release 0 (ENDF/B-VII.0) cross-section evaluations. Both libraries were generated using 200 neutron and 47 gamma groups. The neutron group structure is identical to the 199-group VITAMIN-B6 structure except an additional neutron group has been added to extend the top energy boundary to 20 MeV. In addition to the' "fine-group" libraries, a "broad-group" ENDF/B-VII.0 library has been generated using a 27 neutron and 19 gamma group structure. In addition to the coupled cross-section library development, new shielding codes Monaco and MAVRIC (Monaco with Automated Variance Reduction using Importance Calculations) have been developed for SCALE. This report documents the ENDF/B-VI.8 and ENDF/B-VII.0 cross-section library development and the benchmark testing of the new libraries with the new SCALE shielding transport codes Monaco and MAVRIC.