DAVID DAUGHERTY
Pharmacy at 9 Ave, Pensacola, FL

4781883, Nov 1, 1988

Jul 17, 1987

7/075191

David A. Daugherty - Pensacola FL
Nicholas J. Georges - Pensacola FL
Harry E. Flanders - Pensacola FL
Octavio J. Machado - Pensacola FL

Westinghouse Electric Corp. - Pittsburgh PA

G21F 500

376272

A spent fuel storage cask for long-term storage of spent nuclear fuel following short-term storage in a pool of water. The cask includes a grid basket assembly, resembling a matrix of pigeonholes, for accommodating cells which in turn accommodate spent fuel assemblies. The grid basket assembly is formed by metal plates which transmit heat to channel sections affixed to the interior walls of the cask. The edges of the plates movably fit into the channel sections in order to permit radial movement of the grid basket assembly with respect to the walls of the cask as temperature changes. During storage the cask can be flooded with helium, which readily transmits heat through narrow gaps between the edges of the plates and the walls of the channel sections. Several embodiments of cells having material for moderating neutrons emitted from spent fuel assemblies are also enclosed, some of these embodiments permitting easy conversion of the cask for storing consolidated fuel rather than intact fuel assemblies.

4711758, Dec 8, 1987

Feb 21, 1985

6/703855

Octavio J. Machado - Pensacola FL
David A. Daugherty - Pensacola FL
Ronnie H. Andrews - Cantonment FL
Larry E. Efferding - Pensacola FL

Westinghouse Electric Corp. - Pittsburgh PA

G21C 1932, G21F 500

376272

A cask for storing spent nuclear fuel after removal from a pool of water includes a container with a cylindrical cavity and a basket which is inserted into the container. The basket includes disk-like grid assemblies which provide spent fuel storage slots and which are coaxially mounted at spaced-apart positions, each grid assembly having a diameter that is slightly less than the one above it. If fuel assemblies are to be stored, hollow cells are affixed to one of the grid assemblies and positioned in the others by heat-conducting wedges which permit the basket and cells to expand at different rates. Rings which project slightly into the interior of the container are provided on the container walls, each ring being positioned to be in alignment with the periphery of a corresponding grid assembly after the basket is inserted into the container. Like the grid assemblies, each ring has a diameter that is slightly less than the ring above it, and moreover the diameter of each ring is slightly greater than the diameter of the corresponding grid assembly. These stepped diameters reduce the possibility that the basket might become jammed during the insertion process due to slight misalignment of the basket.