Nuclear reactor internals and control rod handling device

Details Nuclear reactor internals and control rod handling device Nuclear reactor internals and control rod handling device

G - Physics

21

C

359/33

G21C 7/08 (2006.01) G21C 19/10 (2006.01)

Patent

CA 1134074

Abstract of the Disclosure A method and apparatus for removing, in an essentially continuous operation, the control rods and the upper guide structure from a nuclear reactor vessel during refueling. The apparatus includes a rigid frame which is secured to the upper guide structure after the vessel head is removed. A platform is vertically reciprocable within the frame and is adapted to engage and lift simultaneously all control rod drive shafts to a maximum elevation within the frame. A mechanical interface between the platform and the frame is provided so that continuation of the lifting force on the platform transfers the lift force to the frame whereby the upper guide structure is lifted out of the vessel. Automatically operated stop means are provided to lock the platform and rods in the maximum elevation within the frame in order to prevent accidental dropping of the rods during transfer of the upper guide structure and control rods to a temporary storage area.

323779

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