Abstract
This study presents uncertainty and sensitivity analyses of the delayed neutron fraction of light water reactor and sodium-cooled fast reactor fuel assemblies. For these analyses, the sampling-based XSUSA methodology is used to propagate cross section uncertainties in neutron transport and depletion calculations. Cross section data is varied according to the SCALE 6.1 covariance library. Since this library includes nu-bar uncertainties only for the total values, it has been supplemented by delayed nu-bar uncertainties from the covariance data of the JENDL-4.0 nuclear data library. The neutron transport and depletion calculations are performed with the TRITON/NEWT sequence of the SCALE 6.1 package. The evolution of the delayed neutron fraction uncertainty over burn-up is analysed without and with the consideration of delayed nu-bar uncertainties. Moreover, the main contributors to the result uncertainty are determined. In all cases, the delayed nu-bar uncertainties increase the delayed neutron fraction uncertainty. Depending on the fuel composition, the delayed nu-bar values of uranium and plutonium in fact give the main contributions to the delayed neutron fraction uncertainty for the LWR fuel assemblies. For the SFR case, the uncertainty of the scattering cross section of U-238 is the main contributor.
Original language | English |
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Title of host publication | ND 2016 |
Subtitle of host publication | International Conference on Nuclear Data for Science and Technology |
Editors | Peter Siegler, Wim Mondelaers, Arjan Plompen, Franz-Josef Hambsch, Peter Schillebeeckx, Stefan Kopecky, Jan Heyse, Stephan Oberstedt |
Publisher | EDP Sciences |
ISBN (Electronic) | 9782759890200 |
DOIs | |
State | Published - Sep 13 2017 |
Externally published | Yes |
Event | 2016 International Conference on Nuclear Data for Science and Technology, ND 2016 - Bruges, Belgium Duration: Sep 11 2016 → Sep 16 2016 |
Publication series
Name | EPJ Web of Conferences |
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Volume | 146 |
ISSN (Print) | 2101-6275 |
ISSN (Electronic) | 2100-014X |
Conference
Conference | 2016 International Conference on Nuclear Data for Science and Technology, ND 2016 |
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Country/Territory | Belgium |
City | Bruges |
Period | 09/11/16 → 09/16/16 |
Funding
This work is supported by the German Federal Ministry for Economic Affairs and Energy.