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Multilevel-in-Space-and-Energy CMFD in VERA
Nuclear Science and Engineering  (IF1.381),  Pub Date : 2021-03-18, DOI: 10.1080/00295639.2021.1877503
L. R. Cornejo, B. S. Collins, S. G. Stimpson, A. M. Graham


For full-core modeling in the Virtual Environment for Reactor Analysis (VERA), the three-dimensional multigroup eigenvalue neutron transport problem is solved by MPACT. To improve the efficiency of MPACT, advancements have been made in the transport accelerator. Multilevel-in-energy and multilevel-in-space coarse mesh finite difference (CMFD) solvers were developed to improve the efficiency of the CMFD accelerator. In this paper a new multilevel-in-space-and-energy CMFD solver is developed with coarsening in both space and energy on every level. Several different strategies are investigated for coarsening groups in energy. Modified V-cycle and multiple-cycle algorithms are evaluated for solving the multilevel equations. The performance of these solvers is compared for typical full-core reactor physics problems.