The capability of the numerical model to deal with the lead thermal–hydraulic phenomena and their shortcomings is discussed. The methodology of the ANSYS FLUENT model has been described in detail, and the results were compared with both the experimental data and the STAR-CCM + model. The models are benchmarked against the experimental data for both the steady-state and transient regimes. Simultaneously, two computational fluid dynamics (CFD) models of the SESAME stand were developed using ANSYS FLUENT and STAR-CCM + software. The SESAME stand experimental facility was assembled and operated at the Research Centre Rez (CVR) for the collection of thermal-hydraulic data on lead natural convection and solidification in a vessel type geometry. The computational activity was supported by an experimental campaign. An activity that is focused on the development of the numerical models that deal with lead thermal hydraulics and solidification was ongoing within the H2020 project SESAME. Lead freezing may lead to overheating of the fuel assemblies or other components in the primary circuits. ![]() ![]() The study of lead solidification in a lead-cooled fast reactor is critical for the safety analysis of the reactor. Lead-cooled fast reactors (LFRs) are being studied by the organisations in the Generation IV International Forum (GIF) due to molten lead’s good thermodynamic properties, nuclear sustainability and safety.
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