A multi-physics solver for liquid-fueled fast systems based on the discontinuous Galerkin FEM discretization

• Published in: Progress in nuclear energy (New series) 2020-09, Vol.127, p.103427, Article 103427
• Main Authors: Tiberga, Marco, Lathouwers, Danny, Kloosterman, Jan Leen
• Format: Article
• Language: English
• Subjects: Computational fluid dynamics; Computer simulation; Coupling scheme; Discontinuous Galerkin FEM; Discretization; Finite element analysis; Finite element method; Galerkin method; Incompressible RANS; Molten salt fast nuclear reactors; Molten salt nuclear reactors; Multi-physics modeling; Nuclear reactors; Numerical analysis; Physics; SN transport; Steady state; Transient analysis
• ISSN: 0149-1970; 1878-4224
• DOI: 10.1016/j.pnucene.2020.103427

Performing accurate numerical simulations of molten salt reactors is challenging, especially in case of fast-spectrum designs, due to the unique physics phenomena characterizing these systems. The limitations of codes traditionally used in the nuclear community often require the development of novel high-fidelity multi-physics tools to advance the design of these innovative reactors. In this work, we present the most recent code developed at Delft University of Technology for multi-physics simulations of liquid-fueled fast reactors. The coupling is realized between an incompressible RANS model and an SN neutron transport solver. The models are implemented in two in-house codes, based on the discontinuous Galerkin Finite Element discretization, which guarantees high-quality of the solution. We report and discuss the results of preliminary simulations of the Molten Salt Fast Reactor at steady-state and during a Total Loss of Power transient. Results prove our code has capabilities for steady-state and transient analysis of non-moderated liquid-fueled reactors. •Novel multi-physics code for the analysis of liquid-fueled fast reactors.•Coupling between thermal-hydraulics (incompressible RANS) and neutronics (SN transport) models.•Discontinuous Galerkin FEM discretization for space and second-order BDF scheme in time.•Capabilities for 3D, full-core calculations.•Preliminary analysis of the Molten Salt Fast Reactor behavior at steady-state and during a Total Loss of Power transient.