Superphénix Benchmark Part II: Transient Results

Abstract The paper presents a transient simulation phase of the new benchmark on large sodium fast reactor (SFR). This is devoted to modeling selected operational transients performed during startup tests French SFR Superphénix. Six were for analysis. specifications simplified thermal hydraulic model equipped with point kinetics reactivity data and boundary conditions are given in paper. developed contains necessary description primary system components, assumptions account expansion feedback from out-of-core structures, neutron parameters, power distribution, coefficients. neutronic input parameters obtained help Monte Carlo code serpent first related static characterization core. In this study, solution was three codes, namely, TRACE, SIM-SFR, ATHLET. numerical results, compared available experimental data, exhibit reasonable mutual agreement. Particular discrepancies between calculations experiments could not be fully resolved. Therefore, set recommendations achieving an improved agreement proposed. general, proposed can seen as effective tool validation cross comparisons codes applied safety analyses SFRs, including approbation comparison different features structures.