Development and preliminary verifiation of multi-group cross section libraries for PWR shielding design using discrete ordinate method

A broad-group coupled neutron/photon (47n+20 γ) cross section library, formatted in ANISN format, dedicated to PWR shielding design, were generated based on the latest evaluation library ENDF/B-VIII.0. The broad-group library was produced by the NJOY, PUFF-IV and SCALE6.1 program. Firstly, a fine-group library was produced using the NJOY99 nuclear data processing system for the generation of the nuclide cross section data files in GENDF format, and then the SMILER module of PUFF-IV was used for the conversion of GENDF format into the AMPX format. Secondly, the neutron resonance self-shielding and temperature effects of the fine-group library are treated using the Bondarenko method by the BONAMI module of SCALE6.1. Finally, the broad-group library was generated by collapsing the fine-group library through the MALOCS and ALPO module of SCALE6.1. The OECD/NEA PWR benchmark was used to validate the new library processed in this paper. Calculation results show that the processing method for the multi-group library proposed in this paper and the multi-group library developed in this paper are correct, which meets the engineering requirement of shield design. (authors)