MEASUREMENTS OF PARAMETERS LEADING TO p$sub 2$$sub 8$, f, AND /epsislon/ IN LIGHT WATER MODERATED 4.48% AND 2.73% ENRICHED LATTICES

As part of the Yankee and the Relgian Reactor-3 Critical Experiments program, measurements were made of the parameters leading to p, f, and epsilon in a light-water moderated heterogeneous reactor with slightly enriched UO/sub 2/ fuel rods clad in stainless steel. Measurements were made using 4.48 and 2.73% enriched fuel with lattice pitches of 0.470 and 0.435 in. The individual UO/sub 2/ sintered pellets, in the fuel rods, had a diameter of 0.300 in. and a length of 0.600 in. The 4.48 and 2.73% fuel rods conthined 90 and 80 pellets, respectively. The stainless steel cladding was 0.305 in. ID and 0.347 in. OD for the 4.48% enriched fuel, and 0.306 in. ID and 0.338 in. OD in the case of 2.73% enrichment. The measurements were performed using a higher fuel enrichment than used previously at Rettis and elsewhere for similar experiments, thus uncovering a large unexplored rarge of enrichments (auth)