A proposed parameterization of interface discontinuity factors depending on neighborhood for pin-by-pin diffusion computations for LWR

Herrero Carrascosa, José Javier and García Herranz, Nuria and Ahnert Iglesias, Carolina (2011). A proposed parameterization of interface discontinuity factors depending on neighborhood for pin-by-pin diffusion computations for LWR. In: "International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering (M&C 2011", 08/05/2011 - 12/05/2011, Rio de Janeiro, Brasil.

Description

Title: A proposed parameterization of interface discontinuity factors depending on neighborhood for pin-by-pin diffusion computations for LWR
Author/s:
  • Herrero Carrascosa, José Javier
  • García Herranz, Nuria
  • Ahnert Iglesias, Carolina
Item Type: Presentation at Congress or Conference (Unspecified)
Event Title: International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering (M&C 2011
Event Dates: 08/05/2011 - 12/05/2011
Event Location: Rio de Janeiro, Brasil
Title of Book: Proceedings of International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering (M&C 2011
Date: 2011
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

There exists an interest in performing full core pin-by-pin computations for present nuclear reactors. In such type of problems the use of a transport approximation like the diffusion equation requires the introduction of correction parameters. Interface discontinuity factors can improve the diffusion solution to nearly reproduce a transport solution. Nevertheless, calculating accurate pin-by-pin IDF 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. An alternative to generate accurate pin-by-pin interface discontinuity factors is to calculate reference values using zero-net-current boundary conditions and to synthesize afterwards their dependencies on the main neighborhood variables. In such way the factors can be accurately computed during fine-mesh diffusion calculations by correcting the reference values as a function of the actual environment of the pin-cell in the core. In this paper we propose a parameterization of the pin-by-pin interface discontinuity factors allowing the implementation of a cross sections library able to treat the neighborhood effect. First results are presented for typical PWR configurations.

More information

Item ID: 11961
DC Identifier: http://oa.upm.es/11961/
OAI Identifier: oai:oa.upm.es:11961
Deposited by: Memoria Investigacion
Deposited on: 18 Dec 2012 18:33
Last Modified: 21 Apr 2016 11:09
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