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Report No.
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Diffusion coefficients for LMFBR cells calculated with MOC and Monte Carlo methods

Van Rooijen, W. F. G.*; Chiba, Go

The present work discusses the calculation of the diffusion coefficient of a lattice of hexagonal cells, with both "sodium present" and "sodium absent" conditions. Calculations are performed in the framework of lattice theory. Unlike the classical approaches, our heterogeneous leakage model allows the calculation of diffusion coefficients under all conditions, even if planar voids are present in the lattice. Equations resulting from this model are solved using the method of characteristics (MOC). Independent confirmation of the MOC result comes from Monte Carlo calculations, in which the diffusion coefficient is obtained without any of the assumptions of lattice theory. It is shown by comparison to the Monte Carlo results that the MOC solution yields correct values of the diffusion coefficient under all conditions, even in cases where the classic calculation of the diffusion coefficient fails.

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Category:Nuclear Science & Technology

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