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7560687 |
Polarized neutron guide
A polarized neutron guide for separating neutrons into polarized neutrons while minimizing loss of the neutrons is provided. The polarized neutron guide includes a body, the first space and the...
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7477719 |
Control rod and a control rod blade for a boiling water reactor
The present invention relates to a control rod blade for a boiling water reactor. The control rod blade comprises a plurality of channels, which are arranged to receive an absorber material, a free...
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7460632 |
Control rod absorber stack support
An absorber rod for a nuclear reactor having a rod cladding defining an internal volume, the rod cladding having an upper end and a lower end, an upper end fitting positioned in the upper end of...
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7424085 |
Cluster for adjusting a nuclear reactor core reactivity, absorber rod of the cluster and method for protecting the absorber rod against wear
A control cluster for a pressurized water nuclear reactor comprising a bundle of neutron-absorbing rods each of which comprises a metal tube called cladding which is sealed off by a top end plug at...
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7412021 |
Advanced gray rod control assembly
An advanced gray rod control assembly (GRCA) is for a nuclear reactor. The reactor has a plurality of fuel assemblies each including numerous elongated fuel rods supported in an organized array by...
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6882696 |
Control rod for boiling water reactor and method for manufacturing the same
A tie rod having a cruciform cross section is provided with steps for fixing sheaths at tips of cruciform arms of the tie rod; the tips of each of sheaths are fitted onto the steps of the tie rod,...
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6823035 |
Control rod
A control rod ( 2 ) for boiling water reactor comprising four absorber blades ( 6, 7, 8, 9 ) which form an orthogonal cross with a cruciform centre ( 10 ). The width of the absorber blades...
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6654438 |
Control rod for boiling water reactor, unit for control rod and production method of control rod
A control rod for a BWR according to the present invention comprises a first unit composed of a tie rod, a handle mounted on an axially upper portion of the tie rod and a lower support member or...
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6647082 |
Manufacturing method and device of control rods for nuclear reactors
A method for manufacturing a control rod of a nuclear reactor, the control rod having a blade including neutron absorbers and a sheath, a tie rod for fixing the blade, a handle and a lower-blade...
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6636580 |
Control rod for nuclear reactor
A control rod for a nuclear reactor has a structure which is capable of suppressing expansion of a reduced-diameter portion of a neutron absorber in a radial direction under shocks applied upon...
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6614869 |
Absorber rod for nuclear reactor control cluster
The absorber rod comprises cladding ( 12 ) of stainless steel closed by plugs ( 14, 16 ) and containing a column of absorber pellets ( 24 ) e.g. of boron carbide. It also has an end bar ( 26 ) of...
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6470061 |
Control rod for nuclear reactor
The invention relates to a control rod for a boiling water reactor. The control rod comprises a top piece and a bottom piece between which an absorber part is arranged. The absorber part comprises...
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6327322 |
Interlock assembly for burnable poison rod transfer device
A transfer device for moving a poison rod assembly between fuel cells in a nuclear fuel storage facility coupleable to an overhead crane. The poison rod assembly has a plurality of poison rods...
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6299950 |
Fireproof impact limiter aggregate packaging inside shipping containers
The invention is a product and a process for making a fireproof, impact limiter, homogeneous aggregate material for casting inside a hazardous material shipping container, or a double-contained...
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6285728 |
Control rod for nuclear reactor
A control rod for a nuclear reactor is composed of a center structural member, a plurality of wings each composed of a sheath member of long plate structure having a U-shaped cross section and...
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6246740 |
SIC-composite material sleeve and process for producing the same
A cylindrical thin-wall sleeve including an SiC fiber-reinforced SiC composite material (SiC/SiC), which has a porosity of 40% or less and a wall thickness of 5 mm or less.
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6226340 |
Hermaphroditic absorber loading for higher worth control rods
A hermaphroditic absorber exploits the inherent spatial change in the neutron spectrum within a lumped poison mass in a thermal reactor neutron flux field. The hermaphroditic absorber (poison mass)...
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6205196 |
Boiling water type nuclear reactor core and operation method thereof
A boiling water type nuclear reactor core, in which a plurality of fuel assemblies, each enclosed in a channel box, are loaded and a plurality of control rods, each having control blades, are...
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6137854 |
Reactor control rod and method of manufacturing the same
There is provided a reactor control rod which is capable of suppressing an excessive frictional force acting on passive state oxide films formed on the surfaces of neutron absorber elements, and...
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6026136 |
Seed-blanket reactors
Seed-blanket type nuclear reactor cores are employed to burn thorium fuel with conventional reactor fuels, including nonproliferative enriched uranium, and weapons or reactor grade plutonium. In a...
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5883931 |
Control rod for a nuclear reactor having mounting structures for replacing/rearranging/inverting absorber tubes
A control rod includes four panels in cruciform section each containing a plurality of absorber tubes. The absorber tubes are mounted between upper and lower mounting structures having generally...
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5754608 |
Control cluster for a nuclear reactor
The control cluster is usable for power regulation and for load following. It comprises a spider from which are suspended rods containing a column of neutron-absorbing material. The...
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5742655 |
Neutron-absorbent control cluster for a nuclear reactor
A control cluster for a water cooled and moderated nuclear reactor, comprises a spider and rods suspended from the spider. Each rod contains neutron-absorbing material. In a lower portion of each...
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5742651 |
Method of increasing depletion capacity of a control rod for a nuclear reactor
The control rod for a nuclear reactor includes a plurality of wings each having segments of neutron absorbing material exposed along the length of the rod. During refueling, the segments of neutron...
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5719912 |
Control rod for a nuclear reactor
The control rod includes a plurality of elongated tubes containing neutron-absorbing material in a planar array to form wings on opposite sides of a central axis of the control rod. Each tube is...
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5706318 |
Rectangular absorber tube for a control rod in a nuclear reactor
A control rod for a nuclear reactor incorporates a plurality of neutron absorber tubes containing neutron absorbing materials. The absorber tubes are substantially rectangular inside and outside,...
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5610959 |
Hafnium doped replacement rod for nuclear fuel reconstitution
A replacement rod for insertion into a nuclear fuel assembly to replace a fuel rod containing a neutron absorbing, fissile fuel, includes Hafnium sufficient to substantially replace the neutron...
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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...
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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...
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5276718 |
Control blade for nuclear reactor
In a field of commercial nuclear reactors, a control blade, which is inserted into and withdrawn from the core of a nuclear reactor so as to start/shut-down the operation thereof and to control the...
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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...
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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...
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5180544 |
Control blade for nuclear reactor
In the field of commercial nuclear reactors, there is an increasing demand for long-life control blades in order to meet the requirements of higher economy and reduction in the disposal of...
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5164153 |
Control rod assembly for a boiling water reactor
A control rod assembly for a boiling water reactor comprises a tie-rod of a cross-shaped section, and four sheaths. Each of the sheaths is of a U-shaped section and mounted to the respective arms...
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5064607 |
Hybrid nuclear reactor grey rod to obtain required reactivity worth
Hybrid nuclear reactor grey rods are described, wherein geometric combinations of relatively weak neutron absorber materials such as stainless steel, zirconium or INCONEL, and relatively strong...
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4941158 |
Nuclear reactivity control configuration
A neutron flux control component for a nuclear reactor. Thin, overlapping segments of highly neutron absorbing material are positioned in the core of a reactor. The self-shielding overlapping...
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4888150 |
Control rod for nuclear reactors
A control rod for a nuclear reactor comprising a number of absorber plates (13-16) which are connected to each other along a center line on the control rod and which are each provided with a...
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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...
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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...
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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...
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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...
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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...
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4836977 |
Standardized reduced length burnable absorber rods for a nuclear reactor
A cluster of standardized reduced length burnable absorber rods include a plurality of middle rod sections having a multiplicity of different axial lengths and containing burnable absorber material...
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4820478 |
Nuclear reactor control rod with uniformly changeable axial worth
A control rod for use in a nuclear reactor core to provide xenon compensation includes an elongated inner cylindrical member and an elongated outer cylindrical member surrounding the inner member....
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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...
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4762673 |
Burnable poison rod for use in a nuclear reactor
A burnable poison rod for use in a nuclear reactor comprises a metallic tube with upper and lower closure means, a neutron absorber positioned within the cladding and a neutron moderating spacer...
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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...
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4720624 |
Non-uniform resistance heating tubes
This is a non-uniform resistance heating tube constituting a simulated nuclear fuel cluster in a heat transfer test facility for nuclear reactor. This resistance heating tube has a fixed outside...
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4699756 |
Full length control rod employing axially inhomogeneous absorber materials for zero reactivity redistribution factor
A neutron absorber control rod for use in a fuel assembly of a nuclear reactor includes an elongated hollow tubular member having opposite ends and a hermetically sealed chamber defined therein...
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4687627 |
Water displacer rod with hollow annular support pellets having sealed internal voids
An improved water displacer rod includes an elongated hollow thin-walled tube with a pair of end plugs attached to opposite ends of the tube to hermetically seal the tube and a plurality of support...
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