Abstract: 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.

Abstract: A storage rack for nuclear fuel assemblies is located in the pool and formed of grids, each grid formed of fixedly connected cross members. Four separate grids are used with each of the four grids horizontally restrained by adjacent walls in a manner which restrains forces perpendicular to each wall but permits sliding in response to forces parallel to each wall. Each of the grids are supported at locations between the grids, by members which slidably support the grids. The support members are further slidably supported on a central column.