FIELD: nuclear power engineering; passive protection of thermal reactors. SUBSTANCE: device has rod arranged along coolant-channel axis and provided with bevel split joint in the form of trapezoidal projections and slots joined in pairs with ring placed around split joint and moving along rod, rod-mounted absorbing member, and actuating mechanism in the form of bellows mounted at one end on rod above split joint and at other end, on mentioned movable ring; bellows cavities communicate through damping space and valve with coolant path. EFFECT: enhanced operating reliability of protective device. 1 cl, 1 dwg, 1 app
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