Application of quadruple range quadratures to three-dimensional model shielding problems

Joshua J. Jarrell, Marvin L. Adams, Joel M. Risner

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

A widely used numerical method for discretizing the direction variable in the transport equation is the discrete ordinates technique. Here, we test various discrete ordinates quadrature sets on two three-dimensional (3-D) (X-Y-Z) shielding problems: the doglegged void neutron model and the pool critical assembly model. Commonly used quadrature sets, including the standard level symmetric sets and double Gauss-Chebyshev sets, produce significant ray effects associated with material discontinuities in both models. Abu-Shumays designed the quadruple range (QR) sets specifically for these types of problems and showed that they perform well in two-dimensional X-Y geometry. Here, we show that compared to more commonly used quadrature sets, the 3-D QR sets substantially reduce ray effects associated with material discontinuities in 3-D X-Y-Z discrete ordinates calculations.

Original languageEnglish
Pages (from-to)424-430
Number of pages7
JournalNuclear Technology
Volume168
Issue number2
DOIs
StatePublished - Nov 2009
Externally publishedYes

Keywords

  • Angular quadrature
  • Ray effects
  • Shielding

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