[en] Design of a drive interlock device for nuclear reactor emergency protection, fuel recharging of which is carried out without a vessel seal failure, is described. To increase the reliability of the reactor recharging operations the interlock device is made in a form of a jaw clutch and a control sleeve installed between driven and driving elements of the mechanism of displacement of an intermediate rod with a gripper. The rod interlock occurs automatically. Application of the interlock jaw clutch in a drive allows one to obtain information on a rod position. The recharging control is simplified, and reliability of the recharging complex increases simultaneously