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INVE_MEM_2011_103442.pdf
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INVE_MEM_2011_103442.pdf
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Herrero Carrascosa
José Javier

García Herranz
Nuria

Ahnert Iglesias
Carolina
A proposed parameterization of interface discontinuity factors depending on neighborhood for pinbypin diffusion computations for LWR
American Nuclear Society, ANS
byncnd
pub
 nuclear
 industrial
public
There exists an interest in performing full core pinbypin 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 pinbypin IDF requires the knowledge of the heterogeneous neutron flux distribution, which depends on the boundary conditions of the pincell 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 pinbypin interface discontinuity factors is to calculate reference values using zeronetcurrent boundary conditions and to synthesize afterwards their dependencies on the main neighborhood variables. In such way the factors can be accurately computed during finemesh diffusion calculations by correcting the reference values as a function of the actual environment of the pincell in the core. In this paper we propose a parameterization of the pinbypin 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.
published
2011
EEUU
International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering (M&C 2011
Rio de Janeiro, Brasil
08/05/2011  12/05/2011
conference
Industriales
Ingenieria_Nuclear
TRUE
Proceedings of International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering (M&C 2011