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6744842 Fuel assembly for a pressurized-water reactor  
A fuel assembly for a pressurized-water reactor includes fuel rods held in cells of spacers, control rod guide tubes, and a headpiece and a foot piece, by which it is fixed to upper and lower core...
6738447 High energy absorption top nozzle for a nuclear fuel assembly  
A high energy absorption top nozzle for a nuclear fuel assembly that employs an elongated upper tubular housing and an elongated lower tubular housing slidable within the upper tubular housing. The...
6370214 Radiation induced growth indication apparatus for pressurized water reactor nuclear fuel assemblies  
Apparatus for the determination of radiation induced growth due to burnup of a nuclear reactor fuel assembly in a reactor core.
6298108 Nuclear fuel rod with upward-shifted pellet stack and a device to realize same  
A new design concept of boiling water reactor fuel rod is disclosed. The new design is characterized by an upward shift in the location of the fuel pellet stack inside the fuel cladding. The...
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...
5249210 Method and a device for control of the coolant flow in the fuel assembly of a pressurized water reactor  
A method and a device for controlling the coolant flow to the fuel rods (1) in the fuel assembly of a pressurized-water reactor, fuel assembly including an elongated bundle of control rod guide...
5226633 Spring design for use in the core of a nuclear reactor  
A spring design particularly suitable for use in the core of a nuclear reactor includes one surface having a first material oriented in a longitudinal direction, and another surface having a second...
5223211 Zirconium based alloy plate of low irradiation growth, method of manufacturing the same, and use of the same  
A zirconium based alloy plate of low irradiation growth, containing not more than 5 wt % Sn and/or not more 5 wt % Nb, and the balance Zr of not less than 90 wt %. The alloy plate has a texture...
5200142 Nuclear fuel assembly top nozzle with improved peripheral hold-down assembly  
A fuel assembly has a top nozzle which includes a lower adapter plate and a plurality of guide structures thereon. The lower adapter plate has a peripheral edge. The guide structures are attached...
5186890 Reactor core of fast breeder reactor, components of same, and regulating method of coolant distribution of same  
A fuel containment containing nuclear fuel rods of a fuel assembly which will be loaded into a reactor core of a fast breeder reactor is formed narrow in width at middle portion of vertical...
5180549 Nuclear fuel assembly having double enclosure top nozzle subassembly  
A double enclosure top nozzle subassembly for a nuclear fuel assembly includes an upper structure having a top plate and an outer depending peripheral sidewall enclosure, a lower structure having a...
5133926 Extended burnup top nozzle for a nuclear fuel assembly  
A fuel assembly includes an array of fuel rods and guide thimbles disposed in laterally spaced relation to one another. The guide thimbles have upper ends extending above the upper ends of the fuel...
5066453 Nuclear fuel assembly coolant control  
An apparatus for controlling the flow of coolant through a nuclear fuel assembly, in which a coolant flow restrictor 26 having longitudinal ducts 30 is provided with plug members 48, 49, 50 of...
5037607 Reactor  
The present invention provides a structural component for constituting a reactor core comprising one and the other metallic members arranged adjacent to each other in a reactor, and reduction means...
4997621 Lower tie plate with stepped holes to control pressure drop and flow distribution  
An improved lower tie plate having increased fluid flow resistance is disclosed for use in a boiling water nuclear reactor. The fuel bundle includes the lower tie plate, an upper tie plate, and a...
4994234 Controlling coolant flow to nuclear fuel assemblies  
In a BWR- or PWR-type nuclear reactor, the fuel rods in the fuel assembly are cooled by a coolant flow which is pumped through the fuel core. Depending on the degree of burnup of the fuel rods, the...
4986959 Nuclear fuel assembly with expandable top nozzle subassembly  
An expandable top nozzle subassembly for a nuclear fuel assembly includes an upper structure having a top plate and a depending peripheral sidewall enclosure, a lower adapter plate disposed below...
4943409 Reactivity control in nuclear reactors  
To provide intrinsic reactor safety, the fuel sub-assemblies of a nuclear reactor core are provided with reactivity control mechanisms operable, in response to temperature rises above desired...
H000690 Device to allow for expansion of nuclear fuel assemblies  
An upper tie plate assembly for a nuclear reactor includes the usual tie plate having holes to receive the tie rod of the fuel assembly. A lower side member is welded to each side of the tie plate...
4859407 Nuclear reactor fuel assembly  
The invention relates to a fuel assembly for a nuclear reactor comprising a bundle of longitudinal fuel rods which are insertable into the fuel assembly and held together by spacers (1), consisting...
4828792 Nuclear fuel assembly with holding structure and hold down device  
A nuclear fuel assembly comprises a bundle of elongated fuel rods distributed at nodes of a regular lattice and a structure for retaining said fuel rods. The structure has a lower end piece, and...
4764340 Fuel assembly stress relieving fastener  
A device for relieving thermally induced stresses developed in a nuclear fuel assembly during reactor heatup is disclosed herein. The device generally comprises a stress relieving fastener capable...
4744942 Nuclear reactor spacer grid loading  
Spacer grids for a nuclear fuel assembly are arranged in superadjacent groups having grid springs and opposing dimples which contact a fuel rod passing through a cell of the spacer grid with a...
4716015 Modular nuclear fuel assembly design  
A modular component nuclear fuel assembly design in which sub-assembly fuel modules are joined together to form an integral fuel assembly. The invention permits a defective or damaged fuel assembly...
4684504 Bow resistant structural member for fuel assemblies in non-control rod locations of a nuclear reactor core  
A fuel assembly for use at non-control rod locations of a nuclear reactor core includes top and bottom nozzles and longitudinal structural members extending between and attached to the nozzles for...
4683117 Nuclear fuel assembly incorporating primary and secondary structural support members  
A fuel assembly includes top and bottom nozzles, elongated hollow control rod guide thimbles extending longitudinally between and rigidly interconnecting the top and bottom nozzles such that...
4678632 Nuclear fuel assembly grid with predetermined grain orientation  
Zirconium alloy or Zircaloy grid straps in a fuel assembly grid have predetermined texture (or grain orientation) to offset stress relaxation which occurs upon irradiation of the grid....
4678625 Method of straightening bowed irradiated fuel assemblies  
A method of straightening an irradiated fuel assembly having a plurality of control rod guide thimbles in which some of the guide thimbles are bowed and thus greater in length than other of the...
4671926 Fuel assembly for a nuclear reactor  
A fuel assembly for a boiling water reactor has a bundle of fuel rods consisting of a top tie plate and a bottom part which, together with a plurality of fuel rods, constitutes a rigid unit. The...
4663118 Flow channel to nozzle attachment for nuclear fuel assembly  
A flow channel-to-nozzle attachment for a nuclear fuel assembly wherein the flow channel and nozzle are formed of material having different thermal coefficients of expansion, the attachment...
4655995 Reversible BWR fuel assembly and method of using same  
A fuel assembly, particularly advantageous for use with a BWR, wherein the fuel bundle is adapted to be inserted into an envelope formed from a flow channel and a lower nozzle assembly. The fuel...
4637915 Nuclear reactor fuel assembly and method of forming same  
A nuclear fuel assembly, particularly advantageous for use in a pressurized water reactor, wherein each alternate fuel rod in the assembly is positioned with its fission gas plenum zone at the top...
4631167 Method for the production of a nuclear reactor assembly and assembly obtained by this method  
The invention relates to a method for producing an assembly, as well as to an assembly produced by this method. The foot of the assembly is butt welded to the hexagonal tube prior to the...
4631166 High utilization fuel assembly  
A nuclear fuel assembly for high utilization of the nuclear fuel is disclosed. Alternate fuel rod assemblies are axially shifted relative to each other to create zones of high hydrogen-to-uranium...
4587092 Nuclear reactor fuel assembly  
Water-cooled nuclear reactor fuel assembly of the type comprising two end pieces, respectively an upper end piece and a lower end piece, said end pieces having openings for the circulation of the...
4560532 Nuclear fuel assembly  
A nuclear fuel assembly includes and upper yoke, a base, an elongated, outer flow channel disposed substantially along the entire length of the fuel assembly and an elongated, internal, central...
4526744 Fuel assembly for a boiling water reactor  
A fuel assembly for a boiling water reactor comprises a plurality of fuel rods (2, 2'), which constitute four partial bundles and are surrounded by a fuel channel system (1) comprising one partial...
4454093 Fuel assembly with a water distribution channel  
A fuel assembly which comprises a plurality of subassemblies of fuel rods (12), which are each enclosed in a corresponding wall system (1), is provided at its upper end with a horizontal...
4364901 Anti-fly-off device  
The present invention relates to an anti-fly-off device for the fuel element of a nuclear reactor. This device, which is applicable to a nuclear reactor, comprises a plurality of sheathed fuel...
4130460 Fuel assembly for fast reactor  
A fuel assembly for a fast-neutron reactor comprises a shroud having an upstream end and a downstream end. The shroud houses fuel elements having portions filled with fissionable and raw materials,...
4119489 Method of using nuclear reactor fuel assembly  
A nuclear fuel assembly having a bundle of longitudinal fuel elements vertically disposed in a reactor vessel, an upper and a lower tie plate supporting the top and the bottom of the bundle of the...
4104120 Static fuel holddown system  
A holddown column for preventing upstream motion of nuclear-reactor fuel assemblies during operation of the reactor is disclosed. The holddown column is a composite of three concentric individual...
4097331 Coolant mass flow equalizer for nuclear fuel  
The coolant mass flow distribution in a liquid metal cooled reactor is enhanced by restricting flow in sub-channels defined in part by the peripheral fuel elements of a fuel assembly. This flow...
4078967 Holddown device for nuclear fuel assembly  
An apparatus for preventing "floating" of nuclear-reactor fuel assemblies due to hydraulic forces is disclosed. The apparatus uses a holddown column made of the same material as the core barrel....
4076586 Nuclear reactor of the pressurized water type  
In a pressurized water reactor, the pressure vessel contains a plurality of fuel wrappers of parallelepipedal section supported on a lower grid which carries projecting sleeves equal in number to...
4075058 Articulated fuel assembly  
An articulated fuel assembly for the core of a fast spectrum reactor comprising an elongated shroud enclosing a cluster of fuel pins, a support foot assembly supporting the fuel assembly in the...
4042456 Nuclear fuel string assembly  
A reactor fuel system has fuel pins secured to respective carrier rings as an inner sub-assembly and an outer sub-assembly for mutual telescoping relation, with radial spacing thimbles...
4030975 Fuel assembly for a nuclear reactor  
A nuclear reactor fuel assembly having an easily disassembled threaded connection between the end fitting and the control rod guide tubes. More specifically, the threaded connection is formed...
3966550 Reactor fuel assemblies  
An improved spacer grid for a nuclear fuel assembly comprising fuel rods in a matrix wherein each rod is adapted to be enclosed by a spacer "cell" for positioning thereof relative to adjacent rods...
3816247 NUCLEAR FUEL ASSEMBLY, ESPECIALLY FOR A FAST REACTOR  
The fuel assembly comprises at least one bundle of parallel fuel pins disposed on a uniform lattice within a pressure-resistant outer prismatic sleeve which has a polygonal cross-section and...
Matches 1 - 50 out of 100 1 2 >