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Study of a fine-mesh 1:1 Computational Fluid Dynamics – Monte Carlo neutron transport coupling method with discretization uncertainty estimation

2020; Elsevier BV; Volume: 148; Linguagem: Inglês

10.1016/j.anucene.2020.107718

1873-2100

Tiago Augusto Santiago Vieira, Graiciany de Paula Barros, Daniel Campolina, Vitor Vasconcelos, André Augusto Campagnole dos Santos,

Nuclear Engineering Thermal-Hydraulics

In this work, a fine-mesh 1:1 Computational Fluid Dynamics (CFD) – Monte Carlo Neutron Transport (MC) coupled calculations for a IPR-R1 TRIGA MARK I fuel pin was performed. The proposed methodology allowed the simulation of the fuel pin behavior in steady-state for different meshes and the evaluation of the discretization uncertainty. Comparison between mesh-based and Constructive Solid Geometry (CSG) MC simulations was performed. An extended Grid Convergence Index (GCI) method was applied to quantify numerical discretization uncertainty for keff, temperature and power density profiles. Serpent Nuclear Code was used for neutronics simulations, while OpenFOAM was used for thermal–hydraulics calculations. The proposed coupling method was proved convergent. This coupling method did not produce a smooth power density profiles. In order to achieve high-quality profiles, neutronic noise reduction procedure was performed. The results were encouraging, nevertheless, the methodology should be employed on the study of problems with increased complexity for further assessment.