Effects of cross sections tables generation and optimization on rod ejection transient analyses

Sánchez-Cervera Huerta, Santiago and García Herranz, Nuria and Herrero Carrascosa, José Javier and Cuervo Gómez, Diana (2014). Effects of cross sections tables generation and optimization on rod ejection transient analyses. "Annals of Nuclear Energy", v. 73 (n. null); pp. 387-391. ISSN 0306-4549. https://doi.org/10.1016/j.anucene.2014.07.002.

Description

Title: Effects of cross sections tables generation and optimization on rod ejection transient analyses
Author/s:
  • Sánchez-Cervera Huerta, Santiago
  • García Herranz, Nuria
  • Herrero Carrascosa, José Javier
  • Cuervo Gómez, Diana
Item Type: Article
Título de Revista/Publicación: Annals of Nuclear Energy
Date: 2014
ISSN: 0306-4549
Volume: 73
Subjects:
Freetext Keywords: Neutronics-related uncertainties, Tabulated cross sections libraries, Interpolation errors, Optimized grid point distribution
Faculty: E.T.S.I. Industriales (UPM)
Department: Ingeniería Energética
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Best estimate analysis of rod ejection transients requires 3D kinetics core simulators. If they use cross sections libraries compiled in multidimensional tables,interpolation errors – originated when the core simulator computes the cross sections from the table values – are a source of uncertainty in k-effective calculations that should be accounted for. Those errors depend on the grid covering the domain of state variables and can be easily reduced, in contrast with other sources of uncertainties such as the ones due to nuclear data, by choosing an optimized grid distribution. The present paper assesses the impact of the grid structure on a PWR rod ejection transient analysis using the coupled neutron-kinetics/thermal-hydraulicsCOBAYA3/COBRA-TF system. Forthispurpose, the OECD/NEA PWR MOX/UO2 core transient benchmark has been chosen, as material compositions and geometries are available, allowing the use of lattice codes to generate libraries with different grid structures. Since a complete nodal cross-section library is also provided as part of the benchmark specifications, the effects of the library generation on transient behavior are also analyzed.Results showed large discrepancies when using the benchmark library and own-generated libraries when compared with benchmark participants’ solutions. The origin of the discrepancies was found to lie in the nodal cross sections provided in the benchmark.

Funding Projects

TypeCodeAcronymLeaderTitle
FP7323263NURESAFECOMMISSARIAT A L ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVESNUCLEAR REACTOR SAFETY SIMULATION PLATFORM

More information

Item ID: 35152
DC Identifier: http://oa.upm.es/35152/
OAI Identifier: oai:oa.upm.es:35152
DOI: 10.1016/j.anucene.2014.07.002
Official URL: http://www.sciencedirect.com/science/article/pii/S0306454914003296
Deposited by: Memoria Investigacion
Deposited on: 12 Jun 2015 14:57
Last Modified: 14 May 2019 11:39
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