Calculation of Accurate Hexagonal Discontinuity Factors for PARCS

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In this study we derive a methodology for calculating discontinuity factors consistent with the Triangle-based Polynomial Expansion Nodal (TPEN) method implemented in PARCS for hexagonal reactor geometries. The accuracy of coarse-mesh nodal methods is greatly enhanced by permitting flux discontinuities at node boundaries, but the practice of calculating discontinuity factors from infinite-medium (zero-current) single bundle calculations may not be sufficiently accurate for more challenging problems in which there is a large amount of internodal neutron streaming. The authors therefore derive a TPEN-based method for calculating discontinuity factors that are exact with respect to generalized equivalence theory. The method is validated ... continued below

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Pounders. J., Bandini, B. R. , Xu, Y, and Downar, T. J. November 1, 2007.

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  • Bettis Atomic Power Laboratory
    Publisher Info: Bettis Atomic Power Laboratory (BAPL), West Mifflin, PA
    Place of Publication: West Mifflin, Pennsylvania

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In this study we derive a methodology for calculating discontinuity factors consistent with the Triangle-based Polynomial Expansion Nodal (TPEN) method implemented in PARCS for hexagonal reactor geometries. The accuracy of coarse-mesh nodal methods is greatly enhanced by permitting flux discontinuities at node boundaries, but the practice of calculating discontinuity factors from infinite-medium (zero-current) single bundle calculations may not be sufficiently accurate for more challenging problems in which there is a large amount of internodal neutron streaming. The authors therefore derive a TPEN-based method for calculating discontinuity factors that are exact with respect to generalized equivalence theory. The method is validated by reproducing the reference solution for a small hexagonal core.

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  • 2007 RELAP5 International User's Group Seminar (IRUG), Idaho Falls, ID

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  • Report No.: B-T-3711
  • Grant Number: AC11-98PN38206
  • Office of Scientific & Technical Information Report Number: 923321
  • Archival Resource Key: ark:/67531/metadc898963

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  • November 1, 2007

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

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  • Feb. 20, 2017, 2:17 p.m.

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Pounders. J., Bandini, B. R. , Xu, Y, and Downar, T. J. Calculation of Accurate Hexagonal Discontinuity Factors for PARCS, article, November 1, 2007; West Mifflin, Pennsylvania. (digital.library.unt.edu/ark:/67531/metadc898963/: accessed September 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.