Behavior and distribution of nuclides in the fluoride volatility process of uranium containing molten salt fuel

Coupled Computational Fluid Dynamics and Computational Thermodynamics Simulations for Chemically Reacting Flows with Phase Transformations: A Fluoride Volatility Process Example

“…Five simulation Cases presented in this work are based on the experiments made by Sun et al (2019Sun et al ( , 2022 and the understanding of experimental conditions must be stated so that boundary and initial conditions can be understood. The molten salt system, temperature, and viscosity used in each Case are summarized in Table 1.…”

“…The molten salt system, temperature, and viscosity used in each Case are summarized in Table 1. The FVP experiment modelled in this study is part of the first step (Fluorinationsorption step) and the full chemical process can be found in the studies of Sun et al (2019Sun et al ( , 2022. The first step being modelled is illustrated in Fig.…”

“…The specific dimensions of the sealed crucible and volume of the molten salt mixture were obtained by private communication with the authors of Sun et al (2019Sun et al ( , 2022. The sealed crucible used in the experiment has a circular cross-section measuring 5 cm in diameter and 10 cm in height.…”

“…The formation of some gaseous species may be unrealistic during the FVP of the selected salt system, as an example, the formation of gaseous U, UF 3 , UF 4 and UF 5 is not expected. At the same time, no information about their formation was highlighted by Sun et al (2022), for this reason, they were not selected from the JRCMSD. This way, UF 4 can only be calculated to be vaporized as UF 6 , which makes intuitive sense.…”

“…The vaporization rate of UF 4 depends on the specific salt system being used and how temperature and viscosity factors may either delay or expedite the process. The results obtained will be compared with already available experimental data (Sun et al, 2019(Sun et al, , 2022 to provide inputs for code validation. Results can also serve as input for designing the fuel treatment unit of the conceptual Molten Salt Fast Reactor (MSFR) (Tiberga et al, 2020;Di Ronco et al, 2020a,b;Caruggi et al, 2022;Di Ronco et al, 2022), which is currently being studied by the Horizon 2020 Euratom Severe Accident Modeling and Safety Assessment for Fluid-fuel Energy Reactors (SAMOSAFER) project (Horizon 2020Euratom, 2023.…”