Criticality Calculations of BeO—Moderated Enriched Uranium Systems

Criticality calculations have been performed on a series of unreflected BeO—U assemblies made at the Lawrence Radiation Laboratory. The calculations were done with the one-dimensional, multigroup diffusion code ZOOM. In addition to determining the general reliability of the code input constants, studies were made of U-foil self-shielding corrections and the Be(n, 2n) reaction.