APOLLO3 calculation of BWR fuel assembly of a burn-up credit criticality benchmark

The article presents the results obtained by APOLLO3 on the Phase III-C benchmark problem. The paper demonstrates the capability of APOLLO3 to perform accurate burn-up calculations of a BWR assembly. The neutron transport equation is solved using the Method Of Characteristics in space with tracking data for angular discretization. The calculation also uses recently developed tools to automate input creation, validation, and post-treatment, such as ALAMOS and TriAGe. Then we presented a mesh convergence analysis through the study of the infinite multiplication factor k_∞, production, and absorption reaction rates. The comparison of our validation with two other participants highlights the quality of our results. Finally a comparison of our results among other benchmark participants is detailed despite the large dispersion of k_∞ published