Proceedings of the International scientific and practical conference ―Toronto Congress of Advanced Research‖ (April 20-22, 2026) / Publisher website: www.naukainfo.com. – Toronto, Canada, 2026. - 174 p.

163 was proposed in [8] to use a jet-directing curtain, which is capable of separating the warm waters discharged into the pond from the waters of the lower layer of the pond, which enter the water intake structures. This makes it possible to separate the flow not only vertically but also horizontally. As calculations have shown [9, 10], the jet- guiding structure, which reaches the reservoir bottom, separates the water flows at the spillway and intake, thereby improving the thermal operating conditions of the Tashlyk cooling reservoir. The temperature difference between the spillway and intake reaches several degrees. Technical and economic calculations [11, 12] indicate that the implementation of the after-cooling system project is equivalent to commissioning a power unit of a thermal power plant with a capacity of up to 100 MW. Reconstruction of the technical water supply system of the South-Ukrainian NPP will completely eliminate the need for unloading the power units during the summer period due to insufficient cooling capacity of the reservoir. This means that additional losses in electricity generation will be minimized. The purpose of the work is to identify the features of formation and kinematic characteristics of jet and vortex flows near the flexible screen web of a model of a jet- directing structure for improving the cooling conditions of nuclear power plant reactors. Materials and methods. According to the results of numerous simulations and project documentation, the jet control structure (screen) will be located at a distance (80-140) m from the eastern part of the Tashlyk reservoir-cooler. The depth at the location of the screen varies depending on the relief of the bottom from 1 m to 15.2 m. The average depth in the fenced part is equal to (4.4-10.4) m. The distance from the flow control structure to the opposite bank of the reservoir is (1170-1700) m. The vertical screen is made for the entire depth of the flow to the bottom of the reservoir [13]. Currently, the Tashlyk Reservoir is operating under severe thermal regime conditions. In the hot summer months, its cooling capacity decreases. The necessary volume of water of the required temperature is not enough for the operation of all