FIELD: liquid-coolant reactors, their shutdown during accidents involving disconnection of primary circuit pumps. SUBSTANCE: assembly sleeve has brake tube whose diameter is not less than outer diameter of bottom section of extension portion of rod whose side surface is artificially roughened. Distance from upper end of brake tube to upper end of holes in guide tube of sleeve equals total length of hinges, working portion, extension portion, and holes area of connecting portion of rod. Rod end is plugged, holes admitting coolant into it are made on side surface of extension portion above rough-surface area; orifice plate is installed in working portion. EFFECT: improved reliability. 5 cl, 1 dwg
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