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B&W Fuel Company Patents
Assignee:
B&W Fuel Company
Address:
Lynchburg, VA
No. of patents:
22
Patents:












Patent Number Title Of Patent Date Issued
5570400 On line sipping air delivery system October 29, 1996
An on-line sipping air delivery system that propels bubbles across the entire surface of the fuel assembly. A pump delivers liquid through an aspirator located near the bottom of the fuel handling mast. Liquid flow through a venturi in the aspirator causes a drop in pressure inside the
5526388 Debris resistant fuel rod sleeve June 11, 1996
A debris resistant fuel rod sleeve that is received over the lower end of a fuel rod. The sleeve extends above the top of the lowermost spacer grid. Openings are spaced apart around the circumference of the sleeve to correspond to the location of hard stops in the spacer grid. The hard
5490189 Nuclear fuel assembly debris filter February 6, 1996
A nuclear fuel assembly debris filter. Each fuel rod has a ring attached to the lower end cap. The rings are shaped and sized to define a space between the lower end cap and ring such that the space serves to trap, or filter, debris before it reaches the elevation of the fuel cladding. T
5461647 Drive tool for upper end fitting locking arrangement October 24, 1995
A tool for use with an integral reusable locking arrangement between the guide tubes and upper end fitting in a nuclear fuel assembly. A positioner on the tool locates the tool on the upper end fitting grillage and aligns a wrench on the tool with projections on a spring collar used in t
5438598 Combined lower end fitting and debris filter August 1, 1995
A combined lower end fitting and debris filter for a nuclear fuel assembly is provided that does not require multiple parts, welding, brazing, mechanical fasteners, drilling or EDM operations to form the coolant flow holes. The lower end fitting and debris filter are cast as a single wor
5416811 PWR reload fuel assembly May 16, 1995
An upper end fitting for a nuclear fuel assembly that eliminates the problem of free standing fuel assemblies leaning out of range of the lead in provided when installing the reactor upper internals structure. The outer dimensions of each upper end fitting in the fuel assembly are larger
5406599 Spacer grid cell fixture system April 11, 1995
A weld fixture for receiving and aligning the fuel rod contact points of a nuclear fuel bundle spacer grid. Two plates are provided with intersecting unequally spaced slots that define polygons on one side of each plate. Both plates have bores therethrough substantially at the slot i
5398264 Grid welding fixture for a spacer grid March 14, 1995
A modular grid welding fixture for a spacer grid that facilitates full grid laser welding of a spacer grid in one setup. The modular design allows for partial implementation of each weld type. A base plate is used for mounting to the positioning/rotational plate of the welding system. A
5367548 Guide tube retainer November 22, 1994
An integral reusable locking arrangement between the guide tube and upper end fitting of a reconstitutable fuel assembly that eliminates all loose fastener components at the reactor site. A retainer sleeve is fabricated as an addition to or part of the upper end sleeve of the guide tube
5361287 Nuclear fuel assembly lower end fitting November 1, 1994
A nuclear fuel assembly lower end fitting. Two plates each having a network of diagonal and lateral ribs in conjunction with hubs for the guide thimble hole pattern are provided. The pitch between ribs corresponds to one-half of the fuel rod pitch. This allows for the fuel rods to be
5361283 Guide tube retainer November 1, 1994
An integral, reusable locking arrangement between the guide tube assembly and upper end fitting of a reconstitutable fuel assembly that eliminates all loose fastener components at the reactor site. A retainer sleeve is fabricated to cooperate with the upper end sleeve of the guide tube
5339341 Mid span mixer grid August 16, 1994
A mixer grid for a nuclear reactor fuel assembly has a plurality of strips arranged in interlocking rows and columns defining a plurality of cells. A stopper is fixed to each corner of each cell for both directing coolant flow, providing coolant mixing and providing a smooth contact surf
5299245 Spacer grid for a nuclear fuel assembly March 29, 1994
A spacer grid for a nuclear fuel assembly. A plurality of metal strips are interleaved on edge to define a plurality of individual cells. Each cell is sized to receive a single nuclear fuel rod. A series of projections, grid mixing vanes, extend from one edge of each metal strip and are
5272742 Upper end fitting December 21, 1993
An upper end fitting for a nuclear fuel assembly. A main body portion that is square in section has a base rigidly attached thereto. A combined pedestal and holddown spring assembly received in the main body portion is formed from leaf springs attached together by a bolt and nut. The lea
5271049 Grid key for interior grid cells December 14, 1993
A grid key for interior grid cells. A rectangular main body portion is bent near the middle at approximately a 90 degree angle. Two tabs that are flush with the main body portion extend outward in opposite directions from one end and along a portion of the length of the main body portion
5180540 Fuel rod consolidation structure January 19, 1993
A nuclear fuel rod consolidation structure. A storage canister has a grid structure positioned in its interior. The grid structure is provided with a plurality of hexagonally shaped individual cells in a triangular pitch array. This provides nearly a two to one consolidation ratio. The g
5135707 Fuel rod alignment template August 4, 1992
A fuel rod alignment template and method for loading fuel rods in a nuclear fuel assembly. Front and rear guide plates are provided with a plurality of holes corresponding to cells in the fuel assembly to be loaded. The guide plates are rigidly connected together by connecting rods that
5124116 Grid key for exterior grid cells June 23, 1992
A grid key and method for keying exterior grid cells in a nuclear fuel assembly. The grid key has a main body portion having first and second ends and is bent at approximately a 45 degree angle near the first end. Two tabs extend outward from the first end at a right angle to the main
5094802 Nuclear fuel assembly debris filter March 10, 1992
A nuclear fuel assembly with a debris filter. The lower end fitting of the fuel assembly has a stamped plate attached thereto that serves as a debris filter immediately upstream of the fuel rods. The stamped plate is provided with a plurality of flow holes in a size and pattern that
5061437 Grid key for exterior grid cells October 29, 1991
A grid key and method for keying exterior grid cells in a nuclear fuel assembly. The grid key has a main body portion having first and second ends and is bent at approximately a 45 degree angle near the first end. Two tabs extend outward from the first end at a right angle to the main
5037605 Nuclear fuel assembly debris filter August 6, 1991
A nuclear fuel assembly with a debris filter. The lower end fitting of the fuel assembly has a stamped plate attached thereto that serves as a debris filter immediately upstream of the fuel rods. The stamped plate is provided with a plurality of flow holes in a size and pattern that
5009839 Nuclear fuel assembly bottom nozzle plate April 23, 1991
A bottom nozzle plate for a fuel assembly in a nuclear reactor. The bottom nozzle plate is formed from a rigid substantially square plate having legs adapted to be positioned on the lower core plate of the reactor for supporting the fuel assembly above coolant inlet openings in the core

 
 
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