FIELD: hydraulic construction. SUBSTANCE: as a hydroelectric pumped storage power plant 5 operates in turbine mode, water from basin 11 of an upstream reservoir enters a downstream reservoir and then in water passage. Basin 11 is refilled with water through sluice window 13 from middle-deep water layer of basin 10 having water temperature approximately equal to those of reservoir 8. Radioactive elements which enters basin 10, settle as sediment 27 and are accumulated ahead of ground dam 16. Fish grid 14 prevents the radioactive contamination of water passage through fish. EFFECT: increased efficiency of operation. 3 cl, 4 dwg
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