The Dilution Dependency of Multigroup Uncertainties
The propagation of nuclear data uncertainties through reactor physics calculation has received attention through the Organization for Economic Cooperation and Development—Nuclear Energy Agency’s Uncertainty Analysis in Modelling (UAM) benchmark. A common strategy for performing lattice physics uncer...
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| Format: | Article |
| Language: | English |
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Wiley
2014-01-01
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| Series: | Science and Technology of Nuclear Installations |
| Online Access: | http://dx.doi.org/10.1155/2014/306406 |
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| author | M. R. Ball C. McEwan D. R. Novog J. C. Luxat |
| author_facet | M. R. Ball C. McEwan D. R. Novog J. C. Luxat |
| author_sort | M. R. Ball |
| collection | DOAJ |
| description | The propagation of nuclear data uncertainties through reactor physics calculation has received attention through the Organization for Economic Cooperation and Development—Nuclear Energy Agency’s Uncertainty Analysis in Modelling (UAM) benchmark. A common strategy for performing lattice physics uncertainty analysis involves starting with nuclear data and covariance matrix which is typically available at infinite dilution. To describe the uncertainty of all multigroup physics parameters—including those at finite dilution—additional calculations must be performed that relate uncertainties in an infinite dilution cross-section to those at the problem dilution. Two potential methods for propagating dilution-related uncertainties were studied in this work. The first assumed a correlation between continuous-energy and multigroup cross-sectional data and uncertainties, which is convenient for direct implementation in lattice physics codes. The second is based on a more rigorous approach involving the Monte Carlo sampling of resonance parameters in evaluated nuclear data using the TALYS software. When applied to a light water fuel cell, the two approaches show significant differences, indicating that the assumption of the first method did not capture the complexity of physics parameter data uncertainties. It was found that the covariance of problem-dilution multigroup parameters for selected neutron cross-sections can vary significantly from their infinite-dilution counterparts. |
| format | Article |
| id | doaj-art-7ba05f1bf80346b79544a11f95836649 |
| institution | Kabale University |
| issn | 1687-6075 1687-6083 |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Science and Technology of Nuclear Installations |
| spelling | doaj-art-7ba05f1bf80346b79544a11f958366492025-02-03T01:12:19ZengWileyScience and Technology of Nuclear Installations1687-60751687-60832014-01-01201410.1155/2014/306406306406The Dilution Dependency of Multigroup UncertaintiesM. R. Ball0C. McEwan1D. R. Novog2J. C. Luxat3McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4L8, CanadaMcMaster University, 1280 Main Street West, Hamilton, ON, L8S 4L8, CanadaMcMaster University, 1280 Main Street West, Hamilton, ON, L8S 4L8, CanadaMcMaster University, 1280 Main Street West, Hamilton, ON, L8S 4L8, CanadaThe propagation of nuclear data uncertainties through reactor physics calculation has received attention through the Organization for Economic Cooperation and Development—Nuclear Energy Agency’s Uncertainty Analysis in Modelling (UAM) benchmark. A common strategy for performing lattice physics uncertainty analysis involves starting with nuclear data and covariance matrix which is typically available at infinite dilution. To describe the uncertainty of all multigroup physics parameters—including those at finite dilution—additional calculations must be performed that relate uncertainties in an infinite dilution cross-section to those at the problem dilution. Two potential methods for propagating dilution-related uncertainties were studied in this work. The first assumed a correlation between continuous-energy and multigroup cross-sectional data and uncertainties, which is convenient for direct implementation in lattice physics codes. The second is based on a more rigorous approach involving the Monte Carlo sampling of resonance parameters in evaluated nuclear data using the TALYS software. When applied to a light water fuel cell, the two approaches show significant differences, indicating that the assumption of the first method did not capture the complexity of physics parameter data uncertainties. It was found that the covariance of problem-dilution multigroup parameters for selected neutron cross-sections can vary significantly from their infinite-dilution counterparts.http://dx.doi.org/10.1155/2014/306406 |
| spellingShingle | M. R. Ball C. McEwan D. R. Novog J. C. Luxat The Dilution Dependency of Multigroup Uncertainties Science and Technology of Nuclear Installations |
| title | The Dilution Dependency of Multigroup Uncertainties |
| title_full | The Dilution Dependency of Multigroup Uncertainties |
| title_fullStr | The Dilution Dependency of Multigroup Uncertainties |
| title_full_unstemmed | The Dilution Dependency of Multigroup Uncertainties |
| title_short | The Dilution Dependency of Multigroup Uncertainties |
| title_sort | dilution dependency of multigroup uncertainties |
| url | http://dx.doi.org/10.1155/2014/306406 |
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