Direct-coupled-ray method for design-oriented 3-D transport analysis. [LMFBR]

摘要

A fast three-dimensional design oriented transport method has been developed for the solution of both neutron and gamma transport problems. It combines a nodal approach with analytic integral transport to achieve relative speed and accuracy. An analytic solution is obtained for the angular flux in each of the 14 directions defined by the six faces and eight corners of a cubic mesh block. The scheme used to accommodate high order anisotropic scattering is based on the formulation of ray-to-ray scattering probabilities in an integral sense. A variable mesh approximation has also been introduced to provide greater flexibility. The details of a DCR ..-->.. P/sub 1/ conversion technique have been developed but not yet implemented. The DCR method, as implemented in the TRANS3 code, has been used in a number of LMFBR shielding applications. These included a 1-D deep penetration configuration and one-, two-, and three-dimensional representations of the lower axial shield of the Clinch River Breeder Reactor (CRBR). Comparisons with ANISN and DOT-III solutions indicated good to excellent agreement in most situations.