Analysis of the ZPPR-15 Critical Experiments with ENDF/B-V.2 andENDF/B-VII.O Data

摘要

This paper presents the analysis results for the ZPPR-15 critical experiments. Using the ENDF/B-V.2 and ENDF/B-VII.O data, three loading configurations of the ZPPR-15 Phase A experiments were analyzed with the ANL code suite for a fast reactor neutronics analysis, including the recently updated MC2-2 code. For the VIM Monte Carlo analyses with 3-D as-built models, the ENDF/B-VII.O data improved the core multiplication factors by 0.21 to 0.37 %Ak, relative to the ENDF/B-V.2 data. With the plate heterogeneity effects taken into account by the SDX 1-D unit cell calculations, the DIF3D nodal transport solutions with the ENDF/B-V.2 data showed a good agreement for the core multiplication factors with the VIM Monte Carlo results to within 0.12 %Ak, but those with the ENDF/B-VII.O data showed relatively larger deviations. Sensitivity studies based on the RZ models with homogenized cells showed excellent agreement for the core multiplication factors between the deterministic and Monte Carlo calculations to within 0.1 %Ak for both ENDF/B data. These results indicate that the MC2-2 methods are adequate for generating the multigroup cross sections for a fast reactor analysis, but the SDX process to account for the heterogeneity effect needs to be improved for the ENDF/B-VII.O data.