TOAFEW-V Multigroup Cross-Section Collapsing Code and Library of 154-Group-Processed ENDF/B/V Fission-Product and Actinide Cross Sections

摘要

The ENDF/B-V cross sections of 237 fission-product and actinide nuclides have been processed at infinite dilution into 154 neutron energy groups at tempera¬tures of 300, 900, and 1200 K. Additional 154-group self-shielded actinide cross sections were calculated with Bondarenko background σ0 values as small as 1 barn. The production and content of the multigroup data library is described. The T0AFEW-V collapsing code, a modified version of the earlier T0AFEW code, is presented with instructions and examples of its use. The multi-group cross sections were produced using a typical light-water reactor spec¬trum. The group structure is sufficiently fine that collapse to few groups using an appropriate spectrum (e.g., LMFBR, CTR, etc.) is also accurate for alternate applications.