Abstract
The SCALE-XSProc multigroup (MG) cross section processing procedure, which is based on the CENTRM pointwise (PW) slowing-down calculation, is the primary procedure for processing problem-dependent self-shielded MG cross sections and scattering matrices for neutron transport calculations. Recently, significant reactivity bias and reaction rate differences were observed compared with continuous energy Monte Carlo calculations for various prismatic and pebble-type fuels with tristructural isotropic particles in high-temperature gas-cooled reactors. Error sources for these issues were determined, and five areas for improvement were identified and addressed in the SCALE-XSProc MG cross section processing: (1) 10 eV thermal cutoff energy for the free gas model, (2) on-the-fly adjustments to the thermal scattering matrix, (3) normalization of PW neutron flux, (4) improvement of self-shielded cross sections at the epithermal energy range, and (5) improvement of double heterogeneity capabilities.
| Original language | English |
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| Title of host publication | Proceedings of the International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering, M and C 2021 |
| Publisher | American Nuclear Society |
| Pages | 2342-2349 |
| Number of pages | 8 |
| ISBN (Electronic) | 9781713886310 |
| DOIs | |
| State | Published - 2021 |
| Event | 2021 International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering, M and C 2021 - Virtual, Online Duration: Oct 3 2021 → Oct 7 2021 |
Publication series
| Name | Proceedings of the International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering, M and C 2021 |
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Conference
| Conference | 2021 International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering, M and C 2021 |
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| City | Virtual, Online |
| Period | 10/3/21 → 10/7/21 |
Funding
This research was supported by the US Nuclear Regulatory Commission Office of Research. This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan). This research was supported by the US Nuclear Regulatory Commission Office of Research. Notice: This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan).
Keywords
- XSProc
- double heterogeneity
- high-temperature gas-cooled reactors