NEW REFERENCE APOLLO3~® CALCULATION SCHEME FOR SODIUM COOLED FAST REACTORS: FROM SUB-ASSEMBLY TO FULL-CORE CALCULATIONS

摘要

The new reactor analysis platform APOLLO3~® is under development at CEA and should replace the current ERANOS code system for Fast Reactor studies. APOLLO3~® proposes new solvers and advanced numerical methods to be used for all kinds of reactor concepts. At the same time, CEA is largely involved in the study of the ASTRID project and the CFV core. Thus, new calculation schemes for sodium fast reactor must be defined to predict the main neutronic parameters of this core. This paper presents our new reference calculation route called APOLLO3-SFR and its specificities. Each phase of the scheme is detailed and validated against continuous energy Monte Carlo calculations. Several improvements are foreseen, in particular the development and validation of a partial homogenization method with equivalence and an energy-collapsing procedure involving moments of the angular flux.