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dc.contributor.authorDouglass, Steven Jamesen_US
dc.date.accessioned2013-06-15T02:45:43Z
dc.date.available2013-06-15T02:45:43Z
dc.date.issued2012-03-30en_US
dc.identifier.urihttp://hdl.handle.net/1853/47612
dc.description.abstractA condensed multigroup formulation is developed which maintains direct consistency with the continuous energy or fine-group structure, exhibiting the accuracy of the detailed energy spectrum within the coarse-group calculation. Two methods are then developed which seek to invert the condensation process turning the standard one-way condensation (from fine-group to coarse-group) into the first step of a two-way iterative process. The first method is based on the previously published Generalized Energy Condensation, which established a framework for obtaining the fine-group flux by preserving the flux energy spectrum in orthogonal energy expansion functions, but did not maintain a consistent coarse-group formulation. It is demonstrated that with a consistent extension of the GEC, a cross section recondensation scheme can be used to correct for the spectral core environment error. A more practical and efficient new method is also developed, termed the "Subgroup Decomposition (SGD) Method," which eliminates the need for expansion functions altogether, and allows the fine-group flux to be decomposed from a consistent coarse-group flux with minimal additional computation or memory requirements. In addition, a new whole-core BWR benchmark problem is generated based on operating reactor parameters in 2D and 3D, and a set of 1D benchmark problems is developed for a BWR, PWR, and VHTR core.en_US
dc.publisherGeorgia Institute of Technologyen_US
dc.subjectNeutron transport theoryen_US
dc.subjectSubgroup decompositionen_US
dc.subjectCross section condensationen_US
dc.subjectConsistent multigroup methoden_US
dc.subject.lcshRadiative transfer
dc.subject.lcshTransport theory
dc.titleConsistent energy treatment for radiation transport methodsen_US
dc.typeDissertationen_US
dc.description.degreePhDen_US
dc.contributor.departmentNuclear Engineeringen_US
dc.description.advisorCommittee Chair: Rahnema, Farzad; Committee Member: Lubinsky, Doron; Committee Member: Morley, Tom; Committee Member: Petrovic, Bojan; Committee Member: Zhang, Dingkangen_US


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