Generation of SFR few-group constants using the Monte Carlo code Serpent

In this study, the Serpent Monte Carlo code was used as a tool for preparation of homogenized few-group cross sections for the 3D full core analysis of Sodium cooled Fast Reactors (SFR). Few-group group constants for two reference SFR cores were generated by Serpent and then employed by nodal diffusion code DYN3D in full core calculations. The DYN3D results were verified against the references full core Serpent Monte Carlo solutions. A good agreement between the reference Monte Carlo and nodal diffusion results was observed demonstrating the feasibility of using Serpent for generation of few-group constants for the deterministic SFR analysis.