Observatorio de I+D+i UPM

Memorias de investigación
Research Publications in journals:
Propagation of Cross-Section Uncertainties in Criticality Calculations in the Framework of UAM-Phase I Using MCNPX-2.7e and SCALE-6.1
Year:2013
Research Areas
  • Engineering
Information
Abstract
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.
International
Si
JCR
Si
Title
SCIENCE AND TECHNOLOGY OF NUCLEAR INSTALLATIONS
ISBN
1687-6075
Impact factor JCR
0,562
Impact info
Volume
2013
10.1155/2013/380284
Journal number
ID 380284
From page
0
To page
10
Month
SIN MES
Ranking
Participants
  • Autor: Carlos Javier Diez De la Obra (UPM)
  • Autor: Jose Javier Herrero Carrascosa (UPM)
  • Autor: Oscar Luis Cabellos De Francisco (UPM)
  • Autor: Juan Isidoro Seijas Martinez-Echevarria (UPM)
Research Group, Departaments and Institutes related
  • 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
S2i 2020 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)