The Suppression of Energy Discretization Errors in Multigroup Transport Calculations

Larsen, Edward

Battelle Energy Alliance, LLC

关键词: 73 Nuclear Physics And Radiation Physics;   

DOI  :  10.2172/1087139
RP-ID  :  ID14517/09-839
RP-ID  :  AC07-05ID14517
RP-ID  :  1087139

美国|英语

来源: UNT Digital Library

【 摘 要 】

The Objective of this project is to develop, implement, and test new deterministric methods to solve, as efficiently as possible, multigroup neutron transport problems having an extremely large number of groups. Our approach was to (i) use the standard CMFD method to "coarsen" the space-angle grid, yielding a multigroup diffusion equation, and (ii) use a new multigrid-in-space-and-energy technique to efficiently solve the multigroup diffusion problem. The overall strategy of (i) how to coarsen the spatial and energy grids, and (ii) how to navigate through the various grids, has the goal of minimizing the overall computational effort. This approach yields not only the fine-grid solution, but also coarse-group flux-weighted cross sections that can be used for other related problems.