| 摘要 |
A control rod drive for nuclear reactors in which the drive is actuated through a pressure medium that acts against a control piston associated with the rod and having a locking device which includes relatively movable latches that can be selectively engaged in detents in a guide tube for the piston. A second control piston is carried in axially spaced relationship to the control piston within the guide tube and has the same type of locking device. Means are provided within the guide tube to operatively interconnect the locking devices of the two control pistons in a sequential manner and to ensure that, during a movement of the drive in a direction to withdraw the control rod from the reactor, the latches of one locking device are engaged in an associated detent during a movement of the control piston crrrying the other locking device and this locking device is not disengaged until the latches of the other locking device are engaged in another detent. |
