TY - CONF
CY - EEUU
ID - upm11961
UR - http://oa.upm.es/11961/
A1 - Herrero Carrascosa, José Javier
A1 - García Herranz, Nuria
A1 - Ahnert Iglesias, Carolina
Y1 - 2011///
N2 - 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.
PB - American Nuclear Society, ANS
TI - A proposed parameterization of interface discontinuity factors depending on neighborhood for pin-by-pin diffusion computations for LWR
M2 - Rio de Janeiro, Brasil
AV - public
T2 - International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering (M&C 2011
ER -