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A two-dimensional modal method for spatial rehomogenization of nodal cross sections and discontinuity-factor correction. / Gamarino, Matteo; Dall'Osso, Aldo; Lathouwers, Danny; Kloosterman, Jan Leen.

In: Annals of Nuclear Energy, Vol. 125, 2019, p. 157-185.

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@article{284752917543461f9e0484b4c6af7702,
title = "A two-dimensional modal method for spatial rehomogenization of nodal cross sections and discontinuity-factor correction",
abstract = "We propose a two-dimensional (2-D) modal approach for spatial rehomogenization of nodal cross sections in light water reactor analysis. This algorithm aims to synthesize the variation in the 2-D intranodal distributions of the few-group flux and directional net currents between the core environment and the infinite-lattice approximation. Assembly discontinuity factors are also corrected. The method is validated on a broad set of pressurized-water-reactor benchmark problems. Its accuracy is assessed on both nodal quantities and the reconstructed pin-by-pin flux and power distributions. We show that the errors in the effective multiplication factor and assembly-averaged fission power significantly decrease compared to the calculation with infinite-medium homogenization parameters. In most cases, an improvement is also found at the pin level. A thorough discussion follows, which addresses the use of the 2-D neutron current information to compute the transverse-leakage distribution for the transverse-integrated nodal equations, the potential dual application of the method for rehomogenization and dehomogenization, and the quantification of the contributions of various environmental effects (spatial, spectral, and cross energy-space) to homogenization errors.",
keywords = "Homogenization, Nodal methods, Pin-power reconstruction, Spatial effects, Transverse leakage",
author = "Matteo Gamarino and Aldo Dall'Osso and Danny Lathouwers and Kloosterman, {Jan Leen}",
year = "2019",
doi = "10.1016/j.anucene.2018.10.012",
language = "English",
volume = "125",
pages = "157--185",
journal = "Annals of Nuclear Energy",
issn = "0306-4549",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - A two-dimensional modal method for spatial rehomogenization of nodal cross sections and discontinuity-factor correction

AU - Gamarino, Matteo

AU - Dall'Osso, Aldo

AU - Lathouwers, Danny

AU - Kloosterman, Jan Leen

PY - 2019

Y1 - 2019

N2 - We propose a two-dimensional (2-D) modal approach for spatial rehomogenization of nodal cross sections in light water reactor analysis. This algorithm aims to synthesize the variation in the 2-D intranodal distributions of the few-group flux and directional net currents between the core environment and the infinite-lattice approximation. Assembly discontinuity factors are also corrected. The method is validated on a broad set of pressurized-water-reactor benchmark problems. Its accuracy is assessed on both nodal quantities and the reconstructed pin-by-pin flux and power distributions. We show that the errors in the effective multiplication factor and assembly-averaged fission power significantly decrease compared to the calculation with infinite-medium homogenization parameters. In most cases, an improvement is also found at the pin level. A thorough discussion follows, which addresses the use of the 2-D neutron current information to compute the transverse-leakage distribution for the transverse-integrated nodal equations, the potential dual application of the method for rehomogenization and dehomogenization, and the quantification of the contributions of various environmental effects (spatial, spectral, and cross energy-space) to homogenization errors.

AB - We propose a two-dimensional (2-D) modal approach for spatial rehomogenization of nodal cross sections in light water reactor analysis. This algorithm aims to synthesize the variation in the 2-D intranodal distributions of the few-group flux and directional net currents between the core environment and the infinite-lattice approximation. Assembly discontinuity factors are also corrected. The method is validated on a broad set of pressurized-water-reactor benchmark problems. Its accuracy is assessed on both nodal quantities and the reconstructed pin-by-pin flux and power distributions. We show that the errors in the effective multiplication factor and assembly-averaged fission power significantly decrease compared to the calculation with infinite-medium homogenization parameters. In most cases, an improvement is also found at the pin level. A thorough discussion follows, which addresses the use of the 2-D neutron current information to compute the transverse-leakage distribution for the transverse-integrated nodal equations, the potential dual application of the method for rehomogenization and dehomogenization, and the quantification of the contributions of various environmental effects (spatial, spectral, and cross energy-space) to homogenization errors.

KW - Homogenization

KW - Nodal methods

KW - Pin-power reconstruction

KW - Spatial effects

KW - Transverse leakage

UR - http://www.scopus.com/inward/record.url?scp=85055901488&partnerID=8YFLogxK

U2 - 10.1016/j.anucene.2018.10.012

DO - 10.1016/j.anucene.2018.10.012

M3 - Article

AN - SCOPUS:85055901488

VL - 125

SP - 157

EP - 185

JO - Annals of Nuclear Energy

JF - Annals of Nuclear Energy

SN - 0306-4549

ER -

ID: 47405356