Neutronic analysis of SFR core with HELIOS-2, Serpent, and DYN3D codes

► Applicability of the HELIOS-2 for the analysis of SFR lattices was investigated. ► Recommendations for the modifications to the HELIOS-2 methodology are given. ► SFR core was simulated with multi-group nodal diffusion code DYN3D. ► Few-group constants were generated by HELIOS-2 and Serpent. ► DYN3D results were verified with full-core Monte-Carlo solution.