Abstract
Radial diffusion coefficient for a cylindrical cell is calculated by the P 3-approximation in one-group theory. Williams calculated the anisotropic diffusion coefficient in a cylindrical cell by the P 3-approximation. His calculation was, however, limited to the axial diffusion coefficient. Therefore we calculate the radial diffusion coefficient by using the cylindrical approximation introduced by Williams and by following the concise procedure of the P N -method by Davison. As an example of numerical calculation we treat a cell consisting of two different regions, a fuel rod and a surrounding moderator. Results from the present method are compared with those from the diffusion theory and from the collision probability method.
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