Creation of problemdependent Dopplerbroadened cross sections in the KENO Monte Carlo code
In this paper, we introduce a quick method for improving the accuracy of Monte Carlo simulations by generating one and twodimensional cross sections at a userdefined temperature before performing transport calculations. A finite difference method is used to Dopplerbroaden cross sections to the desired temperature, and unitbase interpolation is done to generate the probability distributions for double differential twodimensional thermal moderator cross sections at any arbitrarily userdefined temperature. The accuracy of these methods is tested using a variety of contrived problems. In addition, various benchmarks at elevated temperatures are modeled, and results are compared with benchmark results. Lastly, the problemdependent cross sections are observed to produce eigenvalue estimates that are closer to the benchmark results than those without the problemdependent cross sections.
 Authors:

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 Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
 Univ. of Tennessee, Knoxville, TN (United States)
 Publication Date:
 Grant/Contract Number:
 AC0500OR22725
 Type:
 Accepted Manuscript
 Journal Name:
 Annals of Nuclear Energy (Oxford)
 Additional Journal Information:
 Journal Name: Annals of Nuclear Energy (Oxford); Journal Volume: 88; Journal ID: ISSN 03064549
 Publisher:
 Elsevier
 Research Org:
 Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
 Sponsoring Org:
 USDOE National Nuclear Security Administration (NNSA)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 97 MATHEMATICS AND COMPUTING; 42 ENGINEERING; 99 GENERAL AND MISCELLANEOUS; Monte Carlo; Doppler broadening; Thermal scattering; KENO; SCALE
 OSTI Identifier:
 1286860
 Alternate Identifier(s):
 OSTI ID: 1358752
Hart, Shane W. D., Celik, Cihangir, Maldonado, G. Ivan, and Leal, Luiz C.. Creation of problemdependent Dopplerbroadened cross sections in the KENO Monte Carlo code. United States: N. p.,
Web. doi:10.1016/j.anucene.2015.10.011.
Hart, Shane W. D., Celik, Cihangir, Maldonado, G. Ivan, & Leal, Luiz C.. Creation of problemdependent Dopplerbroadened cross sections in the KENO Monte Carlo code. United States. doi:10.1016/j.anucene.2015.10.011.
Hart, Shane W. D., Celik, Cihangir, Maldonado, G. Ivan, and Leal, Luiz C.. 2015.
"Creation of problemdependent Dopplerbroadened cross sections in the KENO Monte Carlo code". United States.
doi:10.1016/j.anucene.2015.10.011. https://www.osti.gov/servlets/purl/1286860.
@article{osti_1286860,
title = {Creation of problemdependent Dopplerbroadened cross sections in the KENO Monte Carlo code},
author = {Hart, Shane W. D. and Celik, Cihangir and Maldonado, G. Ivan and Leal, Luiz C.},
abstractNote = {In this paper, we introduce a quick method for improving the accuracy of Monte Carlo simulations by generating one and twodimensional cross sections at a userdefined temperature before performing transport calculations. A finite difference method is used to Dopplerbroaden cross sections to the desired temperature, and unitbase interpolation is done to generate the probability distributions for double differential twodimensional thermal moderator cross sections at any arbitrarily userdefined temperature. The accuracy of these methods is tested using a variety of contrived problems. In addition, various benchmarks at elevated temperatures are modeled, and results are compared with benchmark results. Lastly, the problemdependent cross sections are observed to produce eigenvalue estimates that are closer to the benchmark results than those without the problemdependent cross sections.},
doi = {10.1016/j.anucene.2015.10.011},
journal = {Annals of Nuclear Energy (Oxford)},
number = ,
volume = 88,
place = {United States},
year = {2015},
month = {11}
}