Extension of the analytic nodal diffusion solver ANDES to triangular-Z geometry and coupling with COBRA-IIIc for hexagonal core analysis.

Lozano Montero, Juan Andrés and Jiménez Escalante, Javier and García Herranz, Nuria and Aragonés Beltrán, José María (2010). Extension of the analytic nodal diffusion solver ANDES to triangular-Z geometry and coupling with COBRA-IIIc for hexagonal core analysis.. "Annals of nuclear energy", v. 37 (n. 3); pp. 380-388. ISSN 0306-4549. https://doi.org/10.1016/j.anucene.2009.12.00.

Description

Title: Extension of the analytic nodal diffusion solver ANDES to triangular-Z geometry and coupling with COBRA-IIIc for hexagonal core analysis.
Author/s:
  • Lozano Montero, Juan Andrés
  • Jiménez Escalante, Javier
  • García Herranz, Nuria
  • Aragonés Beltrán, José María
Item Type: Article
Título de Revista/Publicación: Annals of nuclear energy
Date: January 2010
ISSN: 0306-4549
Volume: 37
Subjects:
Faculty: E.T.S.I. Industriales (UPM)
Department: Ingeniería Nuclear [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

In this paper the extension of the multigroup nodal diffusion code ANDES, based on the Analytic Coarse Mesh Finite Difference (ACMFD) method, from Cartesian to hexagonal geometry is presented, as well as its coupling with the thermal–hydraulic (TH) code COBRA-IIIc for hexagonal core analysis. In extending the ACMFD method to hexagonal assemblies, triangular-Z nodes are used. In the radial plane, a direct transverse integration procedure is applied along the three directions that are orthogonal to the triangle interfaces. The triangular nodalization avoids the singularities, that appear when applying transverse integration to hexagonal nodes, and allows the advantage of the mesh subdivision capabilities implicit within that geometry. As for the thermal–hydraulics, the extension of the coupling scheme to hexagonal geometry has been performed with the capability to model the core using either assembly-wise channels (hexagonal mesh) or a higher refinement with six channels per fuel assembly (triangular mesh). Achieving this level of TH mesh refinement with COBRA-IIIc code provides a better estimation of the in-core 3D flow distribution, improving the TH core modelling. The neutronics and thermal–hydraulics coupled code, ANDES/COBRA-IIIc, previously verified in Cartesian geometry core analysis, can also be applied now to full three-dimensional VVER core problems, as well as to other thermal and fast hexagonal core designs. Verification results are provided, corresponding to the different cases of the OECD/NEA-NSC VVER-1000 Coolant Transient Benchmarks.

More information

Item ID: 6762
DC Identifier: http://oa.upm.es/6762/
OAI Identifier: oai:oa.upm.es:6762
DOI: 10.1016/j.anucene.2009.12.00
Official URL: http://www.elsevier.com
Deposited by: Memoria Investigacion
Deposited on: 03 May 2011 08:54
Last Modified: 20 Apr 2016 15:56
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