The criticality of cuboidal arrays of subcritical uranium-metal com¬ponents is explored with the KENO Monte Carlo code. A sufficient number of critical experiments is described and calculated with the code using the Hansen-Roach cross-section sets to adequately verify the use of this combination to examine array conditions of interest to nuclear critica-lity safety. The magnitudes of changes in array reactivity associated with a number of safety considerations, usually compensated by arbitrary safety factors, are presented. Among these is a △keff of about 4％ associated with the rearrangement of the units in an array from a square to a triangular pattern together with the necessary adjustment in the lattice cell size.
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