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Propagation of Cross-Section Uncertainties in Criticality Calculations in the Framework of UAM-Phase I Using MCNPX-2.7e and SCALE-6.1
Año:2013
Áreas de investigación
  • Ingenierías
Datos
Descripción
In the framework of the OECD/NEA project on Benchmark for Uncertainty Analysis in Modeling (UAM) for Design, Operation, and Safety Analysis of LWRs, several approaches and codes are being used to deal with the exercises proposed in Phase I, ?Specifications and Support Data for Neutronics Cases.? At UPM, our research group treats these exercises with sensitivity calculations and the ?sandwich formula? to propagate cross-section uncertainties. Two different codes are employed to calculate the sensitivity coefficients of ?eff to cross sections in criticality calculations: MCNPX-2.7e and SCALE-6.1. The former uses the Differential Operator Technique and the latter uses the Adjoint-Weighted Technique. In this paper, the main results for exercise I-2 ?Lattice Physics? are presented for the criticality calculations of PWR.These criticality calculations are done for a 15 × 15 TMI fuel assembly at four different states: HZP-Unrodded, HZP-Rodded, HFP-Unrodded, and HFP-Rodded. The results of the two different codes above are presented and compared. The comparison proves a good agreement between SCALE-6.1 and MCNPX-2.7e in ?eff uncertainty that comes fromthe sensitivity coefficients calculated by both codes. Differences are found when the sensitivity profiles are analysed, but they do not lead to differences in the ?eff uncertainty. 1. Introduction As stated in the Introduction of [1], ?This benchmark project (. . .) responds to the needs of estimating confidence bounds for the results from simulations and analysis in real applications.? Phase I deals with the neutronics cases. (i) Exercise I-1. Cell Physics focused on the derivation of the multigroup microscopic cross section libraries and their uncertainties. (ii) Exercise I-2. Lattice Physics focused on the derivation of the few-group macroscopic cross section libraries and their uncertainties. (iii) Exercise I-3. Core Physics focused on the core steady state stand-alone neutronics calculations and their uncertainties.
Internacional
Si
JCR del ISI
Si
Título de la revista
SCIENCE AND TECHNOLOGY OF NUCLEAR INSTALLATIONS
ISSN
1687-6075
Factor de impacto JCR
0,562
Información de impacto
Volumen
2013
DOI
10.1155/2013/380284
Número de revista
ID 380284
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Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Fusión Nuclear Inercial y Tecnología de fusión
  • Centro o Instituto I+D+i: Instituto de Fusión Nuclear
  • Departamento: Ingeniería Nuclear
  • Departamento: Señales, Sistemas y Radiocomunicaciones