A Cumulative migration method for computing rigorous transport cross sections and diffusion coefficients for LWR lattices with Monte Carlo
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Forget_A cumulative migration.pdf
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Author(s)
Liu, Zhaoyuan
Smith, Kord S.
Forget, Benoit Robert Yves
Date Issued
May 2016
Journal
Physics of Reactors 2016 (PHYSOR 2016): Unifying Theory and Experiments in the 21st Century
Publisher
American Nuclear Society
Citation
Liu, Zhaoyuan, Kord Smith and Benoit Forget. "A Cumulative migration method for computing rigorous transport cross sections and diffusion coefficients for LWR lattices with Monte Carlo." Physics of Reactors 2016 (PHYSOR 2016): Unifying Theory and Experiments in the 21st Century (1-5 May 2016)
Version
Author's final manuscript
Abstract
A new method for computing homogenized assembly neutron transport cross sections and diffusion coefficients that is both rigorous and computationally efficient is proposed in this paper. In the limit of a homogeneous hydrogen slab, the new method is equivalent to the long-used, and only-recently-published CASMO transport method. The rigorous method is used to demonstrate the sources of inaccuracy in the commonly applied “out-scatter” transport correction. It is also demonstrated that the newly developed method is directly applicable to lattice calculations performed by Monte Carlo and is capable of computing rigorous homogenized transport cross sections for arbitrarily heterogeneous lattices. Comparisons of several common transport cross section approximations are presented for a simple problem of infinite medium hydrogen. The new method has also been applied in computing 2-group diffusion data for an actual PWR lattice from BEAVRS benchmark.
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
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DOI of Published Version
http://www.proceedings.com/30896.html
