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7623612 Bi-alloy spacer grid and associated methods  
A bi-alloy spacer grid (BASG) is provided with grid straps and springs made using different zirconium alloys. The grid straps are made from a relatively low growth zirconium alloy, and the springs...
7577230 Fuel support and method for modifying coolant flow in a nuclear reactor  
Fuel supports for a nuclear reactor and methods of modifying fluid flow in a reactor using a fuel support. The fuel supports include a plurality of lumens and a plurality of fuel support apertures...
7561654 Nuclear fuel spacer assembly with debris guide  
In a fuel assembly for a nuclear reactor, a plurality of nuclear fuel rods and at least one fuel rod spacer assembly supporting the fuel rods in an organized array. The fuel rod spacer assembly...
7555093 Spacer for a fuel assembly of a boiling water reactor  
A spacer for a fuel assembly of a boiling water reactor has a frame formed of outer webs and inner webs disposed crosswise relative each other. Gills are disposed on the exterior of the outer webs....
7548602 Spacer grid with mixing vanes and nuclear fuel assembly employing the same  
A spacer grid having tunable mixing vanes for optimizing coolant flow is provided for a nuclear fuel assembly. The mixing vanes include an upper piece and a lower piece, which are coupled to a...
7469030 Spacer grid for a fuel unit in a nuclear reactor cooled by light water  
A spacer grid for a fuel assembly in a light-water-cooled nuclear reactor, for providing the transverse retention of a bundle of fuel rods in mutually parallel arrangements, having an array of...
7421056 Fuel assembly for a boiling water reactor  
A spacer for a fuel element of a boiling water reactor contains cells that are formed by inner partitions, which are disposed in a crisscross manner, and by outer partitions, which surround the...
7149273 Method of fabricating a nuclear reactor fuel assembly grid  
A method of fabricating a fuel assembly grid that includes providing a plurality of interconnected straps that form a lattice pattern, wherein the lattice pattern of the straps defines a plurality...
7085340 Nuclear reactor fuel assemblies  
A nuclear fuel assembly having a parallel array of elongated fuel elements supported between an upper and lower nozzle. Main support grids are substantially evenly spaced along the elongated...
6912264 Fuel assembly  
A fuel element for a nuclear reactor has fuel rods with nuclear fuel guided through spacers. The spacers are equipped with devices that exert a swirling impulse upon a coolant flowing along the...
6909766 Production method for a nuclear fuel assembly support grid and a nuclear fuel assembly support grid produced by the same  
One object of the present invention is to provide a production method for a nuclear fuel assembly support grid that improves the corrosion resistance of welded parts without impairing the...
6888911 Method for preventing fretting damage to fuel rods, nuclear reactor fuel element, device for preventing fretting damage, and spacer in a fuel assembly of a nuclear reactor  
Transverse vibrations of the pellet columns included in the fuel rods of fuel elements are limited by elastically mounting the fuel rod jacket tubes in the mesh of spacer grids. When the fuel rods...
6845138 Spacer grid with hybrid flow-mixing device for nuclear fuel assembly  
A spacer grid with hybrid flow-mixing devices for nuclear fuel bundle is made up of an intersection of a plurality of thin straps at right angles to form a plurality of cells for receiving and...
6819733 Fuel assembly and associated grid for nuclear reactor  
An improved grid for use in a fuel assembly of a nuclear reactor includes a plurality of straps that are interconnected with one another in a lattice fashion to define a plurality of cells, with...
6816563 Spacer and fuel assembly for a nuclear reactor  
The invention concerns a spacer and a fuel assembly for a nuclear reactor. The spacer has a plurality of cells ( 10 ) for holding elongated elements. The cells ( 10 ) are defined by a plurality of...
6807246 Lips-type multi-purposed nuclear fuel assembly spacer grid  
A lips-type multi-purposed spacer grid for supporting fuel rods within a nuclear fuel assembly is disclosed. In the spacer grid, the fuel rods are in contact with dimples and water strider-type...
6765979 Fluid separation device for vent volumes of nuclear fuel bundles  
Separation devices are disposed in the vent volume above part-length rods and above one or more of the spacers above the upper ends of the part-length rods. The separation devices preferably...
6744843 Side-slotted nozzle type double sheet spacer grid for nuclear fuel assemblies  
A side-slotted nozzle type double sheet spacer grid for nuclear fuel assemblies is disclosed. The spacer grid includes intersecting inner strips and four perimeter strips. Each inner strip has unit...
6728329 Fuel assembly  
A fuel assembly having a plurality of fuel rods arranged in a square lattice array. The fuel rods include a plurality of short-length fuel rods each having a fuel active length shorter than that of...
6721384 Spacer grid with side welding support and flow mixing vane for nuclear reactor fuel assembly  
A spacer grid for nuclear fuel assemblies is disclosed. This spacer grid has a plurality of side weld supports, that is, main supports, upper sub-supports and lower sub-supports, on its interlaced...
6714619 Spacer grid with double deflected vanes for nuclear fuel assemblies  
A spacer grid for use in a nuclear fuel assembly has double-deflected vanes that guide an axial flow of coolant around fuel rods and thereby generate swirl flow. The vanes each have a double bend...
6650723 Double strip mixing grid for nuclear reactor fuel assemblies  
A double strip mixing grid for nuclear reactor fuel assemblies is disclosed. This grid is fabricated by intersecting at right angles a plurality of double strips, each fabricated by welding two...
6608881 Duct-type spacer grid with swirl flow vane for nuclear fuel assembly  
A duct-type spacer grid for nuclear fuel assemblies is disclosed. In this spacer grid, a plurality of duct-shaped grid elements, individually having an octagonal cell, are closely arranged in...
6600800 Fuel element for a boiling water nuclear reactor  
In a boiling water fuel assembly, some of the fuel rods are shortened. It is necessary to establish a sufficiently high maximum power for transition to boiling. To optimize this power, spacers are...
6539073 Nuclear fuel bundle having spacers captured by a water rod  
Water rod segments are provided in a nuclear fuel bundle and releasably connected one to the other at joints within openings through the spacers. A lowermost water rod segment passes through a...
6526116 Nuclear fuel assembly with hydraulically balanced mixing vanes  
A support grid for laterally maintaining the relative position of elongated fuel elements within a fuel assembly for use within a core of a nuclear reactor. The grid is formed in the shape of a...
6519309 Pressurized water reactor fuel assembly spacer grid  
A spacer grid for PWR assemblies is characterized by curved flow channels between adjacent fuel rods and straight, essentially flat strips connecting opposite side plates of the spacer. The latter...
6516042 Nuclear fuel assembly  
The invention relates to a fuel assembly for a boiling water reactor which is adapted, during operation of the reactor, to allow water to flow upwards through the fuel assembly while absorbing heat...
6516043 Fuel assembly and reactor core and fuel spacer and channel box  
A fuel assembly includes a plurality of fuel rods placed in a square lattice array of 9-rows/9-columns and at least one water rod. In this fuel assembly, the fuel rod pitch of the plurality of fuel...
6507630 Cell flow diverter and flow diverter/vortex generator assembly for BWR spacers  
A flow diverter is provided for attachment to a spacer cell above a part-length fuel rod. The flow diverter includes a tubular base having a plurality of laterally projecting tabs extending in an...
6487266 Siphon water rods  
A fuel bundle assembly for a boiling water nuclear reactor comprising a plurality of fuel rods having respective fuel columns therein, and arranged in an ordered array, extending between upper and...
6470062 Nuclear fuel assembly  
A fuel assembly for a boiling water reactor which is designed to allow water, during operation of the reactor, to flow upwards through the fuel assembly while absorbing heat from a plurality of...
6421407 Nuclear fuel spacer grid with dipper vanes  
A nuclear fuel spacer grid, fabricated by intersecting a plurality of zircaloy or inconel grid strips and used for placing and supporting a plurality of elongated fuel rods within a nuclear fuel...
6415011 Spacer and a fuel assembly for a nuclear boiling water reactor  
The invention concerns a spacer ( 14 ) for a nuclear boiling water reactor. The spacer ( 14 ) comprises a plurality of cells ( 16 ) for holding or allowing elongated elements ( 12 ) to pass through...
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...
6332012 Grid strap for a nuclear fuel assembly, and a grid including such straps  
A nuclear fuel assembly grid has a plurality of mutually interleaved straps forming an array of fuel rod receiving cells. Each strap is formed with regularly distributed slots for interleaving with...
6278759 Spacer grid with multi-springs and dimple vanes for nuclear fuel assemblies  
A nuclear fuel spacer grid, fabricated by intersecting a plurality of grid strips and used for placing and supporting a plurality of elongated fuel rods within a nuclear fuel assembly, is...
6278758 Support grid for a nuclear reactor fuel assembly  
An improved support grid of a nuclear reactor fuel assembly is described. The support grid has a plurality of first and second straps which are assembled so as to form an eggcrate structure...
6272197 Coolant mixing grid for nuclear fuel assembly  
A fuel assembly for a nuclear reactor is described, the fuel assembly including: a plurality of fuel pins (12) extending substantially parallel to the axis of the assembly and to each other; at...
6236702 Fuel assembly spacer grid with swirl deflectors and hydraulic pressure springs  
A fuel assembly spacer grid including swirl deflectors respectively arranged at interconnections between interconnecting longitudinally and laterally-extending straps on upper ends of the...
6148054 Removable separation devices for nuclear fuel bundles  
A support rod 14 carrying one or more separation devices 12, e.g., swirlers, is releasably secured in a fuel bundle. The support rod and separation devices are sized to pass through openings in the...
6130927 Grid with nozzle-type coolant deflecting channels for use in nuclear reactor fuel assemblies  
A grid with coolant deflecting channels for used in nuclear fuel assemblies is disclosed. In the grid, two sets of intersecting grid strips are arranged in sets at right angles to each other prior...
5875224 Swirler attachment for a spacer of a nuclear fuel bundle  
A swirler is releasably attached to a spacer and lies in the opening through the spacer lying above a part-length fuel rod in a nuclear fuel bundle. Adjacent ferrules have upstanding tabs with...
5875223 Spacer for a nuclear fuel assembly and a nuclear fuel assembly  
A spacer for retaining and positioning elongated elements at one or a plurality of levels in a nuclear reactor fuel assembly comprises a grid structure of joined-together sleeve cells. A coolant is...
5862196 Fuel assembly and spacer for a nuclear reactor  
A spacer including a plurality of cells to retain and mutually fix parallel, elongated elements, extending through the cells, in a bundle in a fuel assembly for a nuclear reactor where a coolant is...
5790624 Mixing vane protecting flap  
A protection flap provided on mixing vanes of structural or mid-span mixer grids in order to eliminate or substantially reduce fretting of fuel rods retained by such grids. The flap is an extension...
5778035 Control of coolant flow in a nuclear reactor  
A nuclear fuel core in a pressurized-water reactor including fuel assemblies, each of which comprise a top tie plate; a bottom tie plate, the top tie plate and the bottom tie plate having...
5757874 Multi-spring strip spacer for nuclear fuel bundles  
The spacer comprises a plurality of strips interleaved with one another to form an eggcrate-type pattern defining essentially rectilinear cells for each fuel rod. Each strip includes a central body...
5666389 Fuel assembly and spacer for a nuclear reactor  
The invention relates to a fuel assembly (1) and a spacer (7) for a nuclear reactor wherein the spacer comprises a plurality of cells (9) for retaining and mutually fixing parallel elongated...
5638416 Fuel assembly  
An arrangement of fuel rod support members having dimples and springs is presented to prevent abrasive wear of the fuel rods caused by bouncing of the fuel rods against the supporting members...
Matches 1 - 50 out of 204 1 2 3 4 5 >