Apparatus for installing and removing a control rod drive in a nuclear reactor

摘要

Apparatus for installing and removing a control rod drive from beneath the pressure vessel of a nuclear reactor, including an elevator carriage for carrying the control rod drive in a generally horizontal position and a single winch mounted on a cart for swinging the control rod drive between horizontal and vertical positions and for raising and lowering the drive when it is in a vertical position. A pneumatic cylinder provides the final lifting action for seating and removing the control rod drive. The lower end of the control rod drive is supported on the elevator cradle by a self-centering bearing which permits the horizontal position of the drive to be adjusted for final alignment with the drive housing. The pneumatic cylinder is mounted on a swinging arm which allows the cylinder to remain in axial alignment with the control rod drive as it is moved horizontally. The upper end of the control rod drive is retained on the elevator by a support roller which automatically swings out of the way and re-engages the drive as it is installed and removed. A pair of winch cables are employed for safety, and loading of the cables is equalized by interconnected hydraulic cylinders connected between the cables and the lower end of the elevator.