Three-dimensional neutron transport with novel local-global coupling

E. E. Lewis, M. A. Smith, G. Palmiotti

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

2 Scopus citations


A new approach for coupling lattice and whole core neutron transport calculations, which was previously applied to two-dimensional problems, is generalized to three-dimensions. The method eliminates the need for spatial homogenization of cross sections at the pin-cell or fuel assembly level. This is accomplished by expressing the interface conditions for heterogeneous pin-cell sized response matrices as spherical harmonic expansions. The expansions are partitioned into low and high order moments, and reflective conditions applied to the high order moments. This results in response matrices of greatly decreased dimension that partially decouple periodic lattice effects from global flux gradients. The method is implemented as modifications to the three-dimensional variational nodal code VARIANT, and applied to a MOX fuel assembly with partially inserted control rods as specified in the OECD/NEA C5G7 benchmark.

Original languageEnglish (US)
Title of host publicationInternational Conference on the Physics of Reactors 2008, PHYSOR 08
PublisherPaul Scherrer Institut
Number of pages6
ISBN (Print)9781617821219
StatePublished - 2008
EventInternational Conference on the Physics of Reactors 2008, PHYSOR 08 - Interlaken, Switzerland
Duration: Sep 14 2008Sep 19 2008

Publication series

NameInternational Conference on the Physics of Reactors 2008, PHYSOR 08


OtherInternational Conference on the Physics of Reactors 2008, PHYSOR 08

ASJC Scopus subject areas

  • Nuclear Energy and Engineering
  • Nuclear and High Energy Physics


Dive into the research topics of 'Three-dimensional neutron transport with novel local-global coupling'. Together they form a unique fingerprint.

Cite this