The lead-coolant flow in the core elements of the BREST-OD-300 reactor is formed at the ingress into the shank portion [lower-end caps] of the elements by a distributing manifold and by the subsequent redistribution in the active sections of the FA through the perforated lateral surface of the shanks. The flow of lead into the distributing manifold arrives from a pressurized ring-shaped descending canal where the lead level is maintained by primary-loop circulation pumps. To model the flow in the descending canal and the distributing and redistributing manifolds, the Bauman Moscow State Technical University engineered and created a scale model of a fragment of a pressurized chamber and core with modeling scale 1.5. The scale model includes 48 elements of the core. The coolant is air. The velocity was measured in characteristic areas of the canal and manifold using a pressure probe and the sensor of a thermo-anemometer, the flow in the distributing manifold was visualized with a tracer fed into the flow, the flow rate was determined at the ingress into the shanks and imitators of the active sections of different fuel assemblies, the experiments were analyzed, and the factors forming the hydrodynamics of the flow in the manifolds and the distribution of the coolant flow through fuel assemblies were ranked.
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Translated from Atomnaya Énergiya, Vol. 133, No. 1, pp. 21–29, July, 2022.
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Dragunov, Y.G., Lemekhov, V.V., Sapozhnikov, I.S. et al. Modeling of the Coolant Flow Distribution Over the Elements of a BREST-OD-300 Reactor Core. At Energy 133, 20–29 (2022). https://doi.org/10.1007/s10512-023-00967-8
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DOI: https://doi.org/10.1007/s10512-023-00967-8