MIT Libraries homeMIT Libraries logoDSpace@MIT

MIT
View Item 
  • DSpace@MIT Home
  • MIT Open Access Articles
  • MIT Open Access Articles
  • View Item
  • DSpace@MIT Home
  • MIT Open Access Articles
  • MIT Open Access Articles
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

On-the-fly doppler broadening of unresolved resonance region cross sections via probability band interpolation

Author(s)
Brown, Forrest B.; Walsh, Jonathan Alan; Forget, Benoit Robert Yves; Smith, Kord S.
Thumbnail
DownloadForget_On-the-fly doppler.pdf (323.7Kb)
OPEN_ACCESS_POLICY

Open Access Policy

Creative Commons Attribution-Noncommercial-Share Alike

Terms of use
Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/
Metadata
Show full item record
Abstract
In this work we present a scheme for computing temperature-dependent unresolved resonance region cross sections in Monte Carlo neutron transport simulations. This approach relies on the generation of equiprobable cross section magnitude bands on an energy-temperature mesh. The bands are then interpolated in energy and temperature to obtain a cross section value. This is in contrast to the typical procedure of pre-generating probability tables at all temperatures present in the simulation. As part of this work, a flexible probability table generation capability is integrated into the continuous-energy neutron transport code OpenMC [1]. Both single-level and multi-level Breit-Wigner formalisms are supported, as is modeling of the resonance structure of competitive reactions. A user-specified cross section band tolerance is enabled with batch statistics. Probability tables are generated for all 268 ENDF/B-VII.1 [2] isotopes that have an unresolved resonance region evaluation. Integral benchmark simulations of the Big Ten critical assembly show that, for a system that is sensitive to the unresolved resonance region, a temperature interval of ∼200 K around 293.6 K is sufficient to reproduce the keff value that is obtained with probability tables generated exactly at room temperature. A finer mesh of < 50 K is required to reproduce some cross section values at the common target relative difference of 0.1%
Date issued
2016-08
URI
http://hdl.handle.net/1721.1/109720
Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Journal
Proceedings of Physics of Reactors 2016 (PHYSOR 2016): Unifying Theory and Experiments in the 21st Century
Publisher
American Nuclear Society (ANS)
Citation
Walsh, Jonathan A. et al. "On-The-Fly Doppler Broadening of Unresolved Resonance Region Cross Sections via Probability Band Interpolation." Physics of Reactors 2016 (PHYSOR 2016): Unifying Theory and Experiments in the 21st Century, 1-5 May, 2016, Sun Valley Resort, Idaho, USA, American Nuclear Society, 2016.
Version: Author's final manuscript
ISBN
9781510825734

Collections
  • MIT Open Access Articles

Browse

All of DSpaceCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

My Account

Login

Statistics

OA StatisticsStatistics by CountryStatistics by Department
MIT Libraries homeMIT Libraries logo

Find us on

Twitter Facebook Instagram YouTube RSS

MIT Libraries navigation

SearchHours & locationsBorrow & requestResearch supportAbout us
PrivacyPermissionsAccessibility
MIT
Massachusetts Institute of Technology
Content created by the MIT Libraries, CC BY-NC unless otherwise noted. Notify us about copyright concerns.