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

Sánchez-Cervera Huerta, Santiago; García Herranz, Nuria; Herrero Carrascosa, José Javier y 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.

Descripción

Título: Effects of cross sections tables generation and optimization on rod ejection transient analyses
Autor/es:
  • Sánchez-Cervera Huerta, Santiago
  • García Herranz, Nuria
  • Herrero Carrascosa, José Javier
  • Cuervo Gómez, Diana
Tipo de Documento: Artículo
Título de Revista/Publicación: Annals of Nuclear Energy
Fecha: 2014
Volumen: 73
Materias:
Palabras Clave Informales: Neutronics-related uncertainties, Tabulated cross sections libraries, Interpolation errors, Optimized grid point distribution
Escuela: E.T.S.I. Industriales (UPM)
Departamento: Ingeniería Energética
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

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.

Más información

ID de Registro: 35152
Identificador DC: http://oa.upm.es/35152/
Identificador OAI: oai:oa.upm.es:35152
Identificador DOI: 10.1016/j.anucene.2014.07.002
URL Oficial: http://www.sciencedirect.com/science/article/pii/S0306454914003296
Depositado por: Memoria Investigacion
Depositado el: 12 Jun 2015 14:57
Ultima Modificación: 12 Jun 2015 14:57
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