Neighborhood-corrected interface discontinuity factors for multi-group pin-by-pin diffusion calculations for LWR

Herrero Carrascosa, José Javier and García Herranz, Nuria and Cuervo Gómez, Diana and Ahnert Iglesias, Carolina (2012). Neighborhood-corrected interface discontinuity factors for multi-group pin-by-pin diffusion calculations for LWR. "Annals of Nuclear Energy", v. 46 ; pp. 106-115. ISSN 0306-4549. https://doi.org/10.1016/j.anucene.2012.03.022.

Description

Title: Neighborhood-corrected interface discontinuity factors for multi-group pin-by-pin diffusion calculations for LWR
Author/s:
  • Herrero Carrascosa, José Javier
  • García Herranz, Nuria
  • Cuervo Gómez, Diana
  • Ahnert Iglesias, Carolina
Item Type: Article
Título de Revista/Publicación: Annals of Nuclear Energy
Date: August 2012
Volume: 46
Subjects:
Freetext Keywords: Interface discontinuity factor; Pin-by-pin computations; Environment effect; ACMFD
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

Performing three-dimensional pin-by-pin full core calculations based on an improved solution of the multi-group diffusion equation is an affordable option nowadays to compute accurate local safety parameters for light water reactors. Since a transport approximation is solved, appropriate correction factors, such as interface discontinuity factors, are required to nearly reproduce the fully heterogeneous transport solution. Calculating exact pin-by-pin discontinuity factors requires the knowledge of the heterogeneous neutron flux distribution, which depends on the boundary conditions of the pin-cell as well as the local variables along the nuclear reactor operation. As a consequence, it is impractical to compute them for each possible configuration; however, inaccurate correction factors are one major source of error in core analysis when using multi-group diffusion theory. An alternative to generate accurate pin-by-pin interface discontinuity factors is to build a functional-fitting that allows incorporating the environment dependence in the computed values. This paper suggests a methodology to consider the neighborhood effect based on the Analytic Coarse-Mesh Finite Difference method for the multi-group diffusion equation. It has been applied to both definitions of interface discontinuity factors, the one based on the Generalized Equivalence Theory and the one based on Black-Box Homogenization, and for different few energy groups structures. Conclusions are drawn over the optimal functional-fitting and demonstrative results are obtained with the multi-group pin-by-pin diffusion code COBAYA3 for representative PWR configurations.

More information

Item ID: 15205
DC Identifier: http://oa.upm.es/15205/
OAI Identifier: oai:oa.upm.es:15205
DOI: 10.1016/j.anucene.2012.03.022
Official URL: http://www.sciencedirect.com/science/article/pii/S0306454912001016
Deposited by: Memoria Investigacion
Deposited on: 03 Dec 2013 19:05
Last Modified: 21 Apr 2016 15:12
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