Effect of Energy Group Structure on a Stylized European Pressurized Reactor (EPR) For Criticality Analysis

摘要

This paper investigates the effect of energy group structure on a stylized MCNP model of the European Pressurized Reactor (EPR). A benchmark of the EPR was previously developed purely for validation of transport methods. This study evaluates the cross sections generated by the lattice depletion code HELIOS for the EPR benchmark. This paper describes the generation of problem-specific multi-group cross sections in 2-, 4-, 8-, and 47-group structures with HELIOS, as well as initial results from assembly level MCNP calculations to evaluate the effect of group-collapsing. The paper also discusses the possible propagation of errors from the cross sections in whole-core calculations.