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Mikityuk, Konstantin (author), Ferreira, Miguel (author), Hatala, Branislav (author), Kloosterman, J.L. (author), Šípová, Monika (author)Five Euratom projects launched since 2017 in support of the development of ESNII/Generation-IV reactor systems are briefly presented in the paper in terms of key objectives, results, and recommendations for the future. These projects focus on various aspects of the following ESNII/Generation-IV systems: Sodium Fast Reactor, Gas Cooled Fast...review 2023
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Kaaks, B.J. (author), Rohde, M. (author), Kloosterman, J.L. (author), Lathouwers, D. (author)We present a discontinuous Galerkin method for melting/solidification problems based on the “linearized enthalpy approach,” which is derived from the conservative form of the energy transport equation and does not depend on the use of a so-called mushy zone. We use the symmetric interior penalty method and the Lax–Friedrichs flux to...journal article 2023
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Alsayyari, F.S. (author), Tiberga, M. (author), Perko, Z. (author), Kloosterman, J.L. (author), Lathouwers, D. (author)In this paper, we present a reduced-order modeling approach to study the Molten Salt Fast Reactor (MSFR). Our approach is nonintrusive and based on the proper orthogonal decomposition method. We include adaptivity in selecting the sampling points both in time and parameter space. Steady-state and transient analysis were both performed using...journal article 2021
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Mastromarino, S. (author), Rook, R. (author), de Haas, D.W. (author), Verschuur, D.J. (author), Rohde, M. (author), Kloosterman, J.L. (author)A method based on ultrasonic wave propagation is applied for the determination of the viscosity of low viscous liquids. A waveguide is used to remotely transmit the ultrasonic waves from a shear piezoelectric transducer into the liquid. At the solid-liquid interface, a guided wave mode, the shear mode, is used to extract the liquid viscosity....journal article 2021
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Alsayyari, F.S. (author), Perko, Z. (author), Tiberga, M. (author), Kloosterman, J.L. (author), Lathouwers, D. (author)We present an approach to build a reduced-order model for nonlinear, time-dependent, parametrized partial differential equations in a nonintrusive manner. The approach is based on combining proper orthogonal decomposition (POD) with a Smolyak hierarchical interpolation model for the POD coefficients. The sampling of the high-fidelity model to...journal article 2021
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Alsayyari, F.S. (author), Tiberga, M. (author), Perko, Z. (author), Lathouwers, D. (author), Kloosterman, J.L. (author)We use a novel nonintrusive adaptive Reduced Order Modeling method to build a reduced model for a molten salt reactor system. Our approach is based on Proper Orthogonal Decomposition combined with locally adaptive sparse grids. Our reduced model captures the effect of 27 model parameters on k<sub>eff</sub> of the system and the spatial...journal article 2020
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Tiberga, M. (author), Lathouwers, D. (author), Kloosterman, J.L. (author)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...journal article 2020
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Tiberga, M. (author), Hennink, A. (author), Kloosterman, J.L. (author), Lathouwers, D. (author)Accurate methods to solve the Reynolds-Averaged Navier-Stokes (RANS) equations coupled to turbulence models are still of great interest, as this is often the only computationally feasible approach to simulate complex turbulent flows in large engineering applications. In this work, we present a novel discontinuous Galerkin (DG) solver for the...journal article 2020
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Gamarino, M. (author), Dall'Osso, Aldo (author), Lathouwers, D. (author), Kloosterman, J.L. (author)In reactor core nodal analysis, the dependence of few-group, homogenized cross sections on the local physical conditions (i.e., the thermal-hydraulic state and material composition) is commonly represented via multivariate interpolation in parameterized libraries. In this paper, we propose a novel approach to model the spectral effects of...journal article 2019
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Bertocchi, F. (author), Rohde, M. (author), Kloosterman, J.L. (author)The core of a Liquid Metal Fast Breeder Reactor (LMFBR) consists of cylindrical fuel rods that are wrapped by a helicoidally-wound wire spacer to enhance mixing and to prevent damage by fretting. It is known that the liquid metal close to the rod is forced to follow the wires, and that liquid metal further away from the rod crosses the wires ...journal article 2019
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Gamarino, M. (author), Dall'Osso, Aldo (author), Lathouwers, D. (author), Kloosterman, J.L. (author)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....journal article 2019
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Bertocchi, F. (author), Rohde, M. (author), Kloosterman, J.L. (author)Gap vortex streets characterise many industrial applications involving rod bundle flows, such as heat exchangers and nuclear reactors. These structures, known as gap vortex streets, may excite the structural components of the bundle to resonance, leading to fretting and fatigue. This work aims to measure these coherent structures and the...journal article 2019
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Alsayyari, F.S. (author), Perko, Z. (author), Lathouwers, D. (author), Kloosterman, J.L. (author)Large-scale complex systems require high fidelity models to capture the dynamics of the system accurately. The complexity of these models, however, renders their use to be expensive for applications relying on repeated evaluations, such as control, optimization, and uncertainty quantification. Proper Orthogonal Decomposition (POD) is a...journal article 2019
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Preliminary investigation on the melting behavior of a freeze-valve for the Molten Salt Fast ReactorTiberga, M. (author), Shafer, Devaja (author), Lathouwers, D. (author), Rohde, M. (author), Kloosterman, J.L. (author)This paper focuses on the freeze-plug, a key safety component of the Molten Salt Fast Reactor, one of the Gen. IV nuclear reactors that must excel in safety, reliability, and sustainability. The freeze-plug is a valve made of frozen fuel salt, designed to melt when an event requiring the core drainage occurs. Melting and draining must be...journal article 2019
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Tiberga, M. (author), Lathouwers, D. (author), Kloosterman, J.L. (author)Numerical simulations of fast MSRs constitute a challenging task. In fact, classical codes employed in reactor physics cannot be used, and new dedicated multi-physics tools must be developed, to capture the unique features of these systems: the strong coupling between neutronics and thermal-hydraulics due to the use of a liquid fuel, the...conference paper 2019
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Gamarino, M. (author), Dall'Osso, Aldo (author), Lathouwers, D. (author), Kloosterman, J.L. (author)Modeling spectral effects due to core heterogeneity is one of the major challenges for current nodal analysis tools, whose accuracy is often deteriorated by cross-section homogenization errors. AREVA NP recently developed a spectral rehomogenization method that estimates the variation of the assembly-averaged neutron flux spectrum between...journal article 2018
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Tiberga, M. (author), Shafer, Devaja (author), Lathouwers, D. (author), Kloosterman, J.L. (author)This paper focuses on the freeze-plug, a key safety component of the Molten Salt Fast Reactor, one of the six Generation IV nuclear reactors that must excel in safety, reliability, and sustainability. The freeze-plug is a valve made of frozen fuel salt, designed to melt when an event requiring the core drainage occurs. It must melt passively,...conference paper 2018
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Gamarino, M. (author), Dall'Osso, Aldo (author), Lathouwers, D. (author), Kloosterman, J.L. (author)Nodal diffusion is currently the preferred neutronics model for industrial reactor core calculations, which use few-group cross-section libraries generated via standard assembly homogenization. The infinite-medium flux-weighted cross sections fail to capture the spectral effects triggered in the core environment by nonreflective boundary...journal article 2018
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Silva Pinto Wahnon, S. (author), Ammirabile, L. (author), Kloosterman, J.L. (author), Lathouwers, D. (author)The demonstrated technological feasibility of Sodium-cooled Fast Reactors (SFRs) makes them stand out among the other reactor concepts proposed by Generation IV International Forum (GIF) for short-term deployment. The availability of reliable computational tools in support of safety analyses and plant simulations under complex transient...journal article 2018
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Bertocchi, F. (author), Rohde, M. (author), Kloosterman, J.L. (author)The enhancement of heat transfer from fuel rods to coolant of a Liquid Metal Fast Reactor (LMFR) decreases the fuel temperature and, thus, improves the safety margin of the reactor. One of the mechanisms that increases heat transfer consists of large coherent structures that can occur across the gap between adjacent rods. This work...journal article 2018
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