Matches 51 - 100 out of 303 < 1 2 3 4 5 6 7 >
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5610956 Fast reactor core  
A fast reactor core in which a coolant flows comprises a plurality of fuel assemblies each loaded with a fissionable material and a plurality of gas sealed assemblies disposed between the fuel...
5592522 Control rod for a nuclear reactor  
A generally cruciform-shaped control rod for a nuclear reactor is formed by vertical stiffeners laterally spaced one from the other and interconnected by horizontal stiffeners at their ends...
5592520 Latch handle for a control road in a nuclear reactor  
A window in the control rod for a nuclear reactor has flanges along its opposite sides. A latch handle has slots along its opposite sides. The latch handle is sized and configured such that in a...
5533076 Control rod absorber tube with interference fit and viscous dampening between the end plug and absorber rod  
A neutron-absorber control rod tube includes end plugs welded at opposite ends to the tube with each end plug having a bore opening into the interior of the tube. A hafnium rod is disposed inside...
5503893 Ultra-high performance carbon composites  
Method of fabricating a multi-ply carbon fibre fabric, preform or composite material from a layer of unidirectionally aligned carbon fibres of ultra-high modulus and a layer of low modulus carbon...
5416813 Moderator rod containing burnable poison and fuel assembly utilizing same  
A moderator rod provided with a burnable poison and disposed in a fuel assembly of a reactor core comprises an outer tube, an inner tube disposed in the outer tube, the outer and inner tubes...
5267286 Fuel assembly and reactor core  
A fuel assembly having a water cross or water rod arranged between the fuel rods, an inside of the water cross or water rod being divided into a coolant rising passage and a coolant lowering...
5247549 Control rod spacer pad  
A spacer pad for a nuclear control rod includes first and second halves each including a head and a shank. The shanks are configured for joining together the pad first and second halves, and the...
5232657 Metal hydride flux trap neutron absorber arrangement for a nuclear fuel storage body  
A flux trap neutron absorber arrangement for use in a fuel storage body between a pair of fuel storage cans which receive and store nuclear fuel assemblies includes separate pockets spaced from one...
5225151 Control rod for nuclear reactors  
In a control rod for nuclear reactors with elongated channels for boron carbide or other neutron-absorbing material which swells upon neutron irradiation, the neutron-absorbing material (20a), in...
5213756 Boiling water reactor with expanded core diameter  
An expanded reactor core capacity is achieved within the constraints imposed by the diametric extent of the current advanced boiling reactor (ABWR). This enhanced core capacity is achieved through...
5198183 Method and apparatus for close packing of nuclear fuel assemblies  
The apparatus of the present invention is a plate of neutron absorbing material. The plate may have a releasable locking feature permitting the plate to be secured within a nuclear fuel assembly...
5183626 Control cluster including demountable fuel for a nuclear fuel assembly  
For each of the demountable fuel rods (23), the end part of the protective tube (27), which end part is open towards the exterior, has a reduced diameter over a certain length and comprises at...
5167906 Apparatus for increasing fuel efficiency in nuclear reactors  
An apparatus for achieving increased fuel efficiency in a nuclear reactor wherein spectral shift is utilized to adjust for excess reactivity. This feature is achieved by stationary displacer rods...
5141711 Reconstitutable control assembly having removable control rods with detachable split upper end plugs  
A reconstitutable control assembly has a spider structure which supports control rods by detachable attachment joints. Each attachment joint includes a hollow connecting finger on the spider...
5124113 Nuclear reactor with improved efficiency  
The invention relates to a nuclear reactor with improved efficiency. The nuclear reactor comprises a massive partition (18) of material reflecting high energy neutrons at the circumference of the...
5100608 In-core nuclear instrumentation for fast breeder reactors  
In-core nuclear instrumentation for a fast breeder reactor includes a neutron flux measuring unit disposed in a control rod assembly, whereby it is possible to measure a change in in-core neutron...
5075069 Method and apparatus for increasing fuel efficiency in nuclear reactors  
A method and apparatus for achieving increased fuel efficiency in a nuclear reactor wherein spectral shift is utilized to adjust for excess reactivity. This feature is achieved by stationary...
5023044 Nuclear reactor control assembly  
An assembly for controlling the release of neutrons in a nuclear reactor having the core split into two halves. A disk assembly formed from at least two circular disks is positioned substantially...
5008068 Plant comprising a nuclear reactor, more particularly a control rod system for nuclear reactor plant  
The reactor core of the plant has tubular vertically movable control rods moved by a pressurized flowing coolant. Each control rod so extends around a tubular guide rod which is immobile relatively...
5006305 Device for guiding the control clusters of nuclear reactors  
Device for guiding nuclear reactor control clusters consisting of several absorbing rods including guide casings, associated respectively with the various control clusters, and, inside each casing,...
4988473 Self-latching reactivity-reducing device for use in on-site spent fuel assembly storage  
A self-latching reactivity-reducing device contains neutron absorbing material and is installable in a guide thimble of a spent fuel assembly for reducing the reactivity of the assembly to allow...
4971749 Nuclear excitation laser type intra-reactor neutron flux measuring system  
A nuclear excitation laser type intra-reactor neutron flux measuring system of this invention is comprised of a laser oscillator filled with a nuclear exciting gas such as 3 He, KrF or XeF,...
4938918 Element immersed in coolant of nuclear reactor  
The zirconium cladding of a coolant-displacement rod of a nuclear reactor is precollapsed in the zirconium oxide stack of pellets which supports the cladding. Current is conducted through the...
4928291 Control cluster provided with removable control elements for a nuclear fuel reactor  
Control cluster and method for the replacement of a control element in the control cluster comprising a plurality of arms and a plurality of control elements each comprising a shank for...
4902468 Control rod support having planar wear surfaces  
A control rod support for mounting within a rod guide of a pressure vessel has plural, parallel axial extending passageway openings therein for receiving corresponding control rods of a control rod...
4882123 Hafnium control rod for nuclear reactors  
A neutron absorbing control device for service in nuclear reactors utilizing fissionable fuel. The control device includes hafnium metal as the neutron absorbing material which is employed in a...
4874574 Control rod  
A control rod has blades each of which includes a neutron absorption region in which neutron absorbers each loaded to the core of a reactor from below and made of absorption nuclear chain type...
4873117 Stainless steel tubular element with improved wear resistance  
A sheath for a nuclear reactor control rod consists of chromium nickel stainless steel. It is protected against friction wear by nitridation over a depth of from 15 to 50 μm obtained by an...
4863672 Absorber rod  
An absorber rod for nuclear reactors with a pile of spherical fuel elements, which is inserted directly into the pile, in order to affect the prevailing neutron flux by absorber material located in...
4863678 Rod cluster having improved vane configuration  
A spider assembly for supporting a corresponding rod cluster in a pressurized water reactor vessel, through which the core outlet flow passes in a predetermined direction. Each spider assembly...
4861544 BWR control rod  
In a control rod for a nuclear reactor having a cruciform shape with four flat planar members, an improved membrane for safeguarding against crevice cracking corrosion is disclosed. Each of the...
4855100 Reconstitutable control rod spider assembly  
A reconstitutable control rod spider assembly includes a spider structure, control rods, and attachment joints for detachably fastening the control rods to the spider structure. Each attachment...
4853176 Hafnium stainless steel absorber rod for control rod  
In a control rod construction for moderating and controlling a reaction of a nuclear reactor, a control rod structure is disclosed in which hafnium is welded to stainless steel. Typically, the...
4832899 Mechanical spectral shift reactor  
The mechanical spectral shift reactor comprises a reactive core having fuel assemblies accommodating both water displacer elements and control rods for selectively changing the volume of...
4820475 Burnable absorber rod push out attachment joint  
A burnable absorber cluster assembly includes a support plate, a plurality of burnable absorber rods, and an improved attachment joint for detachably connecting an upper end of each of the absorber...
4820058 Control rod end plug with a stabilizing configuration  
A nuclear reactor includes a plurality of upstanding guide thimbles and a plurality of control rods received in the guide thimbles and supported for movement relative to the thimbles between...
4798699 Wear sleeve for a control rod end plug  
A nuclear reactor includes a plurality of upstanding guide thimbles and a plurality of control rods received in the guide thimbles and supported for movement relative to the thimbles between...
4778645 Pressurized water reactor having disconnectable two-piece drive rod assemblies, and related methods of assembly and maintenance operations  
Selectively and remotely disconnectable two-piece drive rod assemblies comprising elongated hub and drive rod portions interconnected by a selectively disconnectable coupling, connect rod clusters...
4762672 Fast breeder reactor  
In a fast breeder reactor provided with a core comprising a core region packed with a fissile material and a blanket region which surrounds the outside of said core region and most of which is...
4759896 Method and apparatus for improving flux reduction factors  
A method and apparatus is disclosed for reducing the exposure of pressure vessel welds to fast neutron fluxes. Localized peripheral core areas are provided with rod assemblies which may be made up...
4752440 Control rod for nuclear reactor  
A control rod for a nuclear reactor comprises a number of elongated absorber plates (13-16) which are each provided with a plurality of channels (18b), said channels extending substantially...
4751041 Burnable neutron absorber element  
A burnable, thermal neutron absorber element is provided with a zirconium alloy elongate container having sealed therein both a burnable absorber and the solid moderator material, zirconium...
4735767 Method and device for reducing the activity of a gas-cooled stacked-ball nuclear reactor  
A quenching element of the size and shape of a graphite nuclear fuel ball is introduced to the stacked balls of a stacked ball nuclear reactor core to release a neutron absorbing substance upon...
4728488 Wear resistant zirconium base alloy article for water reactors  
Slender water displacer rods for use in water reactors are provided with rings of a wear resistant coating spaced along the length of the rod. Each coating contains Cr 2 C 3 and is...
4725401 Element immersed in coolant of nuclear reactor  
A coolant-displacement rod for a nuclear reactor including a stack of zirconium-oxide pellets in cladding of ZIRCALOY-4 alloy. The outer surfaces of certain of the pellets spaced at intervals along...
4716016 Universal fuel assembly construction for a nuclear reactor  
The universal fuel assembly has a plurality of elongated corner posts extending longitudinally between and releasably and rigidly interconnecting top and bottom nozzles so as to form a rigid...
4711756 Control rod displacement  
In a nuclear reactor including a core, a plurality of control rods, a support supporting the control rods and movable for displacing the control rods in their longitudinal direction between a first...
4710340 Mechanical spectral shift reactor  
The mechanical spectral shift reactor provides a method and apparatus for controlling a nuclear reactor comprising inserting a plurality of reactor coolant displacer members into the reactor at the...
4698203 Gas-cooled nuclear reactor with a bed of spherical fuel elements  
Gas-cooled nuclear reactors include circulation systems for cooling gas to remove the heat generated in the reactor core. An improved arrangement includes a plurality of steam generators in a...
Matches 51 - 100 out of 303 < 1 2 3 4 5 6 7 >