Abstract
The thermal utilization factor is calculated in the diffusion approximation for a lattice of thick cylindrical fuel blocks. It is shown that when the lattice possesses sufficient symmetry (when similar blocks are located at the vertices of a hexagon, a square, or an equilateral triangle) the method of equivalent cells is a sufficiently good approximation even if the blocks are very close together. The solutions are given in a form such that nondiffusion corrections may be introduced.
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