NEW REFERENCE APOLLO3® CALCULATION SCHEME FOR LIGHT WATER REACTORS – ANALYSIS OF THE BEAVRS BENCHMARK

In the past few years, developments in APOLLO3® deterministic code have mainly been devoted to Fast Reactor applications. this paper, we investigate possibility of using some these methods build an accurate two-step calculation scheme for commercial Pressurized Water Reactors, with application BEAVRS benchmark at hot zero power conditions cycle 1. Our objective is assess performances best “standard” currently possible and a starting point development improved transport solvers innovative schemes. At lattice level, show that subgroup method REL383 energy mesh, associated MOC flux calculation, provides results on different clusters 3x3 cells UOX MOX fuel, including heterogeneity center (guide-tube full water or common absorbers Ag-In-Cd B4C inserted, mixed uranium-gadolinium oxide fuel). These good confirmed assembly, rods out. core 20-group 3D calculations MINARET Sn solver performed cell level analyze Hot Zero Power (reactivity, map, control worths). Results are rather satisfactory, considering low computing cost, but map prediction needs be improved.