Verification of the procedure to generate the homogenized multi group cross section for VHTR fuel block using McCARD

McCARD/CAPP code system for designing Very High Temperature Gas Cooled Reactor (VHTR) core has been developed in the Korea Atomic Energy Research Institute (KAERI). McCARD/CAPP code system carry out a neutronic analysis for VHTR through the generation of a homogenized cross section using McCARD (Monte Carlo Code for Advanced Reactor Design) and the few group diffusion analysis using CAPP (Core Analyzer for Pebble and Prismatic type VHTRs). The previous procedure using HELIOS has the limits of not considering the axial heterogeneity and the double heterogeneity which is the unique characteristics of VHTR fuel block. However, McCARD based on Monte Carlo Method has the function of handling the double heterogeneity. In addition, Seoul National University (SNU) recently implemented the module to generate the multi-group cross section table-sets into McCARD. Thus, in this study, we carried out the verification calculations of the procedure to generate the homogenized multi-group cross section for VHTR fuel block using McCARD and investigated the feasibility of the McCARD/CAPP code system