NE Seminars

Thursday, April 1, 2004

• Hikaru Hiruta, Ph.D. Candidate, Department of Nuclear Engineering, NC State University
• ``Spatially Consistent Coarse-Mesh Discretization of the Low-Order Quasidiffusion Equations for Solving Reactor-Physics Problems"
• Abstract:
  
  The modern computational methodology for reactor physics calculations is based on single-assembly transport calculations with reflective boundary conditions that generate homogenized few-group data, and core-level coarse-mesh diffusion calculations that evaluate a large-scale behavior of the scalar flux. Recently, an alternative approach based on the low-order equations of the quasidiffusion (QD) method has been developed in order to account accurately for complicated transport effects in full-core calculations. This approach is combined with single-assembly transport calculations that use special albedo boundary conditions which enable one to simulate efficiently effects of an unlike neighboring assembly on assembly's group data.

  In this talk, we will present our recent efforts of the development of spatially consistent coarse-mesh discretization method for the 2D low-order quasidiffusion equations for the full-core calculations. The coarse-mesh solution generated by this method preserves a number of spatial polynomial moments of the fine-mesh transport solution over coarse cells. The proposed method reproduces accurately the complicated large-scale behavior of the transport solution within assemblies.

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