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Influence of an SN solver in a fine-mesh neutronics/thermal- hydraulics framework

Klas Jareteg (Institutionen för teknisk fysik, Nukleär teknik) ; Paolo Vinai (Institutionen för teknisk fysik, Nukleär teknik) ; Christophe Demazière (Institutionen för teknisk fysik, Nukleär teknik) ; Srdjan Sasic (Institutionen för tillämpad mekanik, Strömningslära)
PHYSOR 2014: The Role of Reactor Physics toward a Sustainable Future (2014)
[Konferensbidrag, refereegranskat]

In this paper a study on the influence of a neutron discrete ordinates (SN) solver within a fine-mesh neutronic/thermal-hydraulic methodology is presented. The methodology consists of coupling a neutronic solver with a single-phase fluid solver, and it is aimed at computing the two fields on a three-dimensional (3D) sub-pin level. The cross-sections needed for the neutron transport equations are pre-generated using a Monte Carlo approach. The coupling is resolved in an iterative manner with full convergence of both fields. A conservative transfer of the full 3D information is achieved, allowing for a proper coupling between the neutronic and the thermal-hydraulic meshes on the finest calculated scales. The discrete ordinates solver is benchmarked against a Monte Carlo reference solution for a two-dimensional (2D) system. The results confirm the need of a high number of ordinates, giving a satisfactory accuracy in keff and scalar flux profile applying S16 for 16 energy groups. The coupled framework is used to compare the SN implementation and a solver based on the neutron diffusion approximation for a full 3D system of a quarter of a symmetric, 7x7 array in an infinite lattice setup. In this case, the impact of the discrete ordinates solver shows to be significant for the coupled system, as demonstrated in the calculations of the temperature distributions.

Nyckelord: coupled neutronics/thermal-hydraulics, discrete ordinates method, fine-mesh, sub-pin cross-section generation



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Denna post skapades 2015-01-19. Senast ändrad 2015-09-02.
CPL Pubid: 210967

 

Institutioner (Chalmers)

Institutionen för teknisk fysik, Nukleär teknik (2006-2015)
Institutionen för tillämpad mekanik, Strömningslära (2005-2017)

Ämnesområden

Energi
Teknisk fysik

Chalmers infrastruktur

C3SE/SNIC (Chalmers Centre for Computational Science and Engineering)

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