Title page for ETD etd-05192014-134201

Type of Document Master's Thesis
Author Roskoff, Nathan J
Author's Email Address roskofnj@vt.edu
URN etd-05192014-134201
Title Implementation and Verification of the Subgroup Decomposition Method in the TITAN 3-D Deterministic Radiation Transport Code
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Alireza Haghighat Committee Chair
Leigh Winfrey Committee Member
Mark Pierson Committee Member
  • energy condensation
  • subgroup decomposition method
  • multigroup transport
  • neutron transport theory
Date of Defense 2014-05-07
Availability restricted
The subgroup decomposition method (SDM) has recently been developed as an improvement over the consistent generalized energy condensation theory for treatment of the energy variable in deterministic particle transport problems. By explicitly preserving reaction rates of the fine-group energy structure, the SDM directly couples a consistent coarse-group transport calculation with a set of fixed-source “decomposition sweeps” to provide a fine-group flux spectrum. This paper will outline the implementation of the SDM into the three-dimensional, discrete ordinates (SN) deterministic transport code TITAN. The new version of TITAN, TITAN-SDM, is tested using 1-D and 2-D benchmark problems based on the Japanese designed High Temperature Engineering Test Reactor (HTTR). In addition to accuracy, this study examines the efficiency of the SDM algorithm in a 3-D SN transport code.
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