Matches 1 - 50 out of 234 1 2 3 4 5 >
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7551705 Fuel assembly top nozzle repair sleeve and method for repairing a fuel assembly  
A method and device to repair nuclear fuel assembly structural defects in the top nozzle to guide thimble connection, wherein the device includes a repair sleeve comprising tendons configured to...
7290319 Methods for installing a fuel pellet locking retainer in a nuclear fuel rod  
A method for installing a locking retainer in a tube to maintain internal components within the tube under compression comprising the steps of: a) providing an elongated retainer spring having...
6934351 Boiling water reactor fuel assembly  
An fuel assembly with a connection between a fuel channel and a lower tie plate to allow the fuel channel to be removed from an internal fuel rod assembly without the necessity of moving interior...
6721381 Seal arrangement for in-core instrument housing  
A seal arrangement for providing a seal between a nuclear reactor in-core instrument housing and an instrument contained within the housing includes a lower seal assembly surrounding an outer...
6697448 Neutronic fuel element fabrication  
This disclosure describes a method for metallurgically bonding a complete leak-tight enclosure to a matrix-type fuel element penetrated longitudinally by a multiplicity of coolant channels. Coolant...
6668034 Method of inspecting an operation of sealed closure by welding the end of a filling channel traversing the upper plug of a nuclear fuel rod  
A method of inspecting an operation of sealed closure by welding an end opening of a filling channel axially traversing an upper plug for closing the cladding of a fuel rod for a nuclear reactor,...
6665363 Method of inspecting the welding of a sealed closure plug of a nuclear reactor fuel element  
Before welding, the plug and the sleeve of the fuel rod being in the welding position at the welding station, the sleeve and the plug of the fuel rod are rotated about their common axis with the...
6644915 Nuclear power station primary pump  
There is provided a nuclear power station primary pump of the type comprising a drive shaft for rotating a wheel, a heat exchanger, a thermal barrier cover comprising a peripheral skirt provided at...
6347130 Fuel assembly with short fuel units  
A fuel assembly for a boiling water reactor comprising a plurality of fuel units, stacked on top of each other, each of which comprising a plurality of fuel rods extending vertically between a top...
6310931 Device and method for locking rods in a bottom tie plate of a fuel assembly  
The present invention relates to a fuel assembly (1) and a method therefor. The fuel assembly is intended for a light-water cooled nuclear reactor and comprises a first and a second locking member...
6212250 Fuel element closure method  
A method for providing a leak-tight metal enclosure to a fuel matrix penetrated by coolant channels, wherein the mutually contacting surfaces of said metal enclosure and said fuel matrix are...
6104773 Fuel rod for a nuclear reactor  
A fuel rod for a nuclear reactor includes a metal cladding tube being filled with nuclear fuel and having ends, an outer surface, and a longitudinal axis. A metal seal plug is welded to one of the...
6014418 Fuel rod for light water reactor and method for manufacturing the same  
A fuel rod for a light water reactor comprises a cladding tube which comprises a zirconium alloy having a composition including 0.6 to 2.0% by weight of Nb, 0.5 to 1.5% by weight of Sn, 0.05 to...
5949839 Fuel assembly for a boiling water reactor  
A fuel assembly for a boiling water reactor where the fuel assembly during operation is arranged vertically in the core of the reactor. The fuel assembly comprises a plurality of vertical fuel rods...
5943385 Nuclear fuel assembly having a transition piece providing a reduced flow resistance  
In order to reduce the flow resistance of a coolant flowing through a passage in a support plate of a boiling water reactor and entering a transition piece at a lower end of a fuel assembly resting...
5878100 Fuel assembly for a boiling water reactor  
A fuel assembly for a boiling water reactor comprises a plurality of first full-length fuel rods arranged in an orthogonal lattice, wherein each fuel rod is included in two rows of fuel rods...
5748691 Apparatus and methods for sealing end plugs for nuclear fuel rods  
End plugs for nuclear fuel rods are provided with a spot weld along the interior end face of the end plugs to seal any streamer openings or passages along the axis of the end plugs, thereby...
5619546 Resistance temperature detector nozzle mechanical clamp  
A fluid tight mechanical clamp for creating a compressed graphite seal between a resistance temperature detector nozzle and a NSSS piping hot or cold leg pipe is provided which includes a split...
5608768 Threaded fuel rod end plugs and related method  
In a fuel bundle assembly for a nuclear reactor wherein a plurality of fuel rods and tie rods extend between upper and lower tie plates and wherein some of the fuel rods are partial length fuel...
5602885 Automated girth weld inspection of nuclear fuel rods  
The girth welds joining the end plugs and the hollow tubes of nuclear fuel rods are inspected automatically using a technique that averages reflectance values, compares the reflectance values to...
5600694 Nuclear fuel upper end fitting quick disconnect joint  
A fuel assembly for use in a pressurized water nuclear reactor includes an assembly having guide tubes joined at their upper ends to posts having heads against which is biased a holddown plate...
5586155 Narrow access scanning positioner for inspecting core shroud in boiling water reactor  
A method and an apparatus for inspecting a core shroud by remote operation. The apparatus is a robotic scanning device which can be installed in the narrow space between the core shroud and the jet...
5581588 Insulated protective coating doped with a noble metal for mitigation of stress corrosion cracking  
A method for mitigating crack initiation and propagation on the surface of metal components in a water-cooled nuclear reactor. An electrically insulating coating doped with a noble metal is applied...
5577081 Method of forming grids for nuclear fuel assembly and grids formed by same method  
A method of forming a nuclear fuel assembly grid, as well as the resulting grid itself, are disclosed. In the formation of the grid, formed straps having slits are prepared, arranged into a grid...
5555280 Process and device for producing a leakproof protective coating on a surface of a nuclear reactor component  
The surface of the component (1, 2) to be protected is scanned, a jet of semitransferred arc plasma (17) into which a metal powder is introduced. The process can be applied to the production of a...
5533077 Method for preventing scratches on fuel rods during fuel bundle assembly  
An improved method for assembling bundles of nuclear fuel rods which reduces damage to the fuel cladding surface as the fuel rods are passed through an array of spacers. In particular, the...
5526388 Debris resistant fuel rod sleeve  
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...
5490189 Nuclear fuel assembly debris filter  
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...
5436944 Device and method for monitoring the internal surface of a tubular piece  
The device includes a first tubular support (11) carrying on its outside surface means for fixing to a handling tool, a second tubular support (18) mounted coaxially inside the first support (11)...
5425071 Loading nuclear fuel pellets into cladding tubes  
An end plug is inserted into the end of a nuclear fuel pin cladding tube after loading mixed oxide fuel pellets into the tube from a containment area. During the pellet loading operation, a...
5374800 Method for welding of fuel rod  
A resistance welding method for a fuel rod is presented in which the gas seal opening is closed with a sealing material of the same composition as the end plug material. The method enable to...
5345488 Nuclear fuel rod having concave weld across pressurization hole in end plug  
A TIG welding system for controlling the weld shape for the seal welding of a small pressurization hole in the end plug of nuclear fuel rods. The controlled shape of the seal weld enables improved...
5317612 Use of shape memory alloys in fuel pellet holddown springs  
A composite holddown spring for applying an axial force to a fuel pellet stack in a nuclear reactor fuel rod. The composite holddown spring comprises a shape-memory alloy spring portion and a...
5303277 Process for fabricating fuel rod and end plug therefor  
A process is presented for fabricating a fuel rod including an elongated fuel tube, a lower end plug for sealing one of the openings, and an upper end plug for sealing an opposite opening. The...
5282233 Low pressure drop easy load end cap  
A low pressure drop easy load fuel assembly rod end cap 40 for pressurized water reactor fuel assembly rods 10 has a solid Zircaloy radiused tip 42. The tip 42 blends into a longitudinal profile...
5280508 Partial length rod upper end plug and grapples therefor  
A part length fuel rod tip and group of tip grasping tools is set forth for the removal, inspection and replacement of part length fuel rods from a fuel bundle having a part length rods...
5251247 Method of sealing a fuel rod by welding  
The invention relates to a method of sealing a fuel rod (1) after pressurization with helium. The method comprises supplying helium to the fuel rod via a fill hole (3) provided through the plug...
5245640 Nuclear fuel rod end plug pressurization hole inspection apparatus  
To inspect the integrity of pressurization holes in nuclear fuel rod final end plugs, quality assurance apparatus includes an adapter providing a test chamber into which an end plug is inserted....
5219517 Fuel assembly for a boiling water nuclear reactor  
A fuel assembly for a boiling water nuclear reactor contains a plurality of vertical fuel rods, which are arranged between a bottom tie plate and a top tie plate in a surrounding vertical casing...
5174948 Transitory fuel rod guidance system  
A removable and reusable cap for fuel rod ends to prevent grid damage during loading permits fuel end configurations to match utility's special tooling for fuel assembly repair and reconstitution....
5167909 Lower connector of a fuel assembly of a nuclear reactor cooled by light water  
The lower connector (10) comprises a transverse element (12) having a box-shaped structure. The transverse element (12) comprises a reticular structure (13) resistant to bending and limited...
5164156 Method of controlling weld chamber purge and cover gas atmosphere  
A method of controlling the gas atmosphere in a welding chamber includes detecting the absence of a fuel rod from the welding chamber and, in response thereto, initiating the supplying of a flow of...
5158740 Fuel rod end plug welding method  
A trepan is provided in a flat end face of an end plug about an external opening of an axial bore through the end plug. The trepan includes an annular groove encircling the external opening and an...
5132077 Lower end fitting  
An improved lower end fitting (L.E.F.) having a bell mouth type of flow jet diffuser decrease pressure drop 10-15%, more evenly distributes flow and adds strength. It includes neutron thimble flux...
5069865 Method of forming a gripper cavity in a fuel rod end plug  
A method of forming a gripper cavity in a nuclear fuel rod end plug includes the basic steps of providing an end plug blank having an internal bore of substantially uniform diameter that opens at...
5068083 Dashpot construction for a nuclear reactor rod guide thimble  
A dashpot in a control rod guide thimble for a nuclear fuel assembly includes a lower tubular portion of an elongated main tube of the guide thimble, an auxiliary hollow tube inserted in the lower...
5061436 Gas cooled nuclear fuel element  
A gas cooled nuclear fuel element having a particle fuel retention device which acts as a passive restraint in the event of failure of hot frit. A particle fuel retention device is positioned...
5043134 Fuel rod gripper end cap for minimizing impact with grid cell dimples  
An end cap is mounted on a fuel rod gripper to cover the end portions of fingers thereon to minimize impacts with grid cell dimples. The fingers are defined by circumferentially-spaced and...
5033511 Device for the pressure-sealed obturation of a portion of a primary duct of a pressurized-water nuclear reactor  
The device for pressure-sealed obturation comprises a flexible tubular casing (22) having an open end along the perimeter of which the casing constitutes an inflatable toric seal (30) and a base...
5022437 Hollow plug for blocking a heat exchanger tube  
A hollow plug for blocking a heat exchanger tube includes an expansion zone expanded into a frictional connection with the heat exchanger tube. An outer surface in the expansion zone has a first...
Matches 1 - 50 out of 234 1 2 3 4 5 >