Application of the Subgroup Decomposition Method (SDM) for Reactor Simulation

Nathan Roskoff, William Walters, Alireza Haghighat

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The performance of the TITAN-SDM algorithm for solving a reactor pressure vessel dosimetry problem is evaluated. Douglass and Rahnema recently developed the he subgroup decomposition method (SDM); a methodology which directly couples a consistent coarse-group transport calculation with a set of "decomposition sweeps" to provide a fine-group flux spectrum. The SDM has been implemented into the TITAN three-dimensional transport code and has been shown to accurately solve core criticality problems while significantly reducing computation time. This paper addresses the use of SDM for fixed-source problems. The VENUS-2 dosimetry benchmark problem is selected with an emphasis on fast neutron analysis; therefore, material cross sections are generated from the BUGLE-96 library considering neutron energies greater than 0.1 MeV. The accuracy and efficiency of TITAN-SDM is evaluated by comparison with a standard TITAN multigroup calculation.

Original languageEnglish (US)
Title of host publicationISRD 2014 - International Symposium on Reactor Dosimetry
EditorsAbdallah Lyoussi
PublisherEDP Sciences
ISBN (Electronic)9782759819294
StatePublished - Feb 3 2016
Event15th International Symposium on Reactor Dosimetry, ISRD 2014 - Aix en Provence, France
Duration: May 18 2014May 23 2014

Publication series

NameEPJ Web of Conferences
ISSN (Print)2101-6275
ISSN (Electronic)2100-014X


Other15th International Symposium on Reactor Dosimetry, ISRD 2014
CityAix en Provence

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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