Matches 101 - 150 out of 303 < 1 2 3 4 5 6 7 >
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4687621 Nuclear fuel assembly with improved spectral shift-producing rods  
An improved spectral shift-producing rod in a fuel assembly of a nuclear reactor has an elongated hollow tubular body with a pair of end plugs attached to its opposite ends to hermetically seal the...
4687631 Top nozzle mounted reusable fastener device in a reconstitutable nuclear fuel assembly  
A reusable fastener device includes an attachment nut and a retainer housing mounted to the adapter plate of the fuel assembly top nozzle and removable with the top nozzle upon reconstitution of...
4684499 Burnable absorber rod releasable latching structure  
A fuel assembly with a top nozzle having an adapter plate, at least one guide thimble connected to the adapter plate, and a burnable absorber rod disposed within the guide thimble, includes a...
4684498 Guide thimble captured locking tube in a reconstitutable fuel assembly  
In a reconstitutable fuel assembly, a top nozzle attaching structure for mounting the top nozzle adapter plate in releasable locking engagement upon the guide thimble upper end portions includes...
4683107 Method and device for replacing neutron absorber rods  
Neutron absorber rods are mounted with their upper ends in bores formed in a mounting device and the absorber rods are movable within guide tubes of a nuclear reactor fuel assembly. A holding...
4676948 Nuclear reactor control rod  
A control rod for a nuclear reactor wherein plates of neutron absorbing material (e.g. hafnium) are used in the upper portion thereof and tubes containing a different neutron absorbing material...
4671927 Nuclear fuel rod containing a hybrid gadolinium oxide, boron carbide burnable absorber  
A nuclear fuel rod contains nuclear fuel pellets that have incorporated therein a hybrid burnable absorber that affects a moderation of the burn-out rate of the system containing the rod. The...
4666639 Process for the production of spherical fuel elements  
To produce spherical fuel or absorber elements for high temperature reactors a mixture of coated nuclear fuel or absorber particles and graphite molding composition is molded into spheres,...
4664878 Light water moderator filled rod for a nuclear reactor  
A non-boron moderator filled rod for a nuclear reactor fuel assembly has a tubular body with a pair of end plugs sealing the opposite ends thereof and defining a chamber within the body. A liquid...
4652424 Extended life nuclear control rod  
A control rod for a nuclear fuel assembly has structures formed of boron carbide mounted inside it. The boron carbide structures are provided deformable members between them which will deform at...
4642216 Control rod cluster arrangement  
A control rod assembly arrangement is disclosed for a light water nuclear reactor. Absorber rods are combined with stainless steel rods to achieve a more homogeneous poison distribution effect...
4640813 Soluble burnable absorber rod for a nuclear reactor  
A soluble burnable absorber rod for a nuclear reactor fuel assembly has a tubular body with a pair of end plugs sealing the opposite ends thereof and defining a chamber within the body. A neutron...
4631165 Boiling water reactor control rod  
A boiling water nuclear power reactor includes an improved control rod associated with each of its clusters of fuel assemblies. The control rod has an elongated central stem defining a...
4626404 Annular burnable absorber rod  
An annular burnable absorber rod which minimizes the displacement of cooling water from a nuclear reactor core is disclosed. The rod is constructed from a pair of concentric tubes providing a...
4624826 Control rod velocity limiter  
A velocity limiting device providing greater resistance to motion through a fluid in one direction than in the opposite direction. The device includes a toroidally shaped control member having a...
4617170 Assembly for a core of a nuclear reactor  
An element for a core of a nuclear reactor, includes a square grid assembly formed of a plurality of spacers distributed over the length of the element, structural elements interconnecting the...
4610893 Method of manufacturing an absorber plate for a boiling water reactor  
An absorber plate designed to be located in a gap between fuel rod bundles in the core of a boiling water reactor is manufactured by anchoring a burnable neutron-absorbing material to at least one...
4609521 Complementary shutdown device for an undermoderated nuclear reactor  
A complementary shutdown device for an undermoderated nuclear reactor, comprising, inside certain arrays (3) of the core, guide tubes (7) of which the cross-section is at least equal to the sum of...
4609524 Nuclear reactor component rods and method of forming the same  
A nuclear reactor component such as a fuel rod, burnable absorber rod, or neutron absorber rod, comprising a hermetically sealed metallic tube containing a solid material such as a nuclear fuel,...
4581201 Flexible control rod for a nuclear reactor  
A flexible control rod for a nuclear reactor is built up of first, second, third and fourth absorber wings which are arranged in a cruciform configuration. Each wing is divided into a number of...
4576787 Burnable absorber assembly  
Elongated tubular elements containing burnable absorber material are clustered in an array to provide a burnable absorber assembly for insertion within one or more guide thimbles of a fuel assembly...
4568515 Control system for a small fission reactor  
A system for controlling the reactivity of a small fission reactor includes an elongated, flexible hollow tube in the general form of a helical coiled spring axially positioned around and outside...
4486384 Fuel assembly for a nuclear reactor  
Fuel assembly for a nuclear reactor having a bundle of fuel rods of circular cross section extending parallel to one another and disposed at positions forming a raster, including a guide tube for a...
4481164 Reactivity control assembly for nuclear reactor  
Reactivity control assembly for nuclear reactor comprises supports stacked above reactor core for holding control rods. Couplers associated with the supports and a vertically movable drive shaft...
4474728 Neutron absorber pellets with modified microstructure  
An improved annular burnable poison pellet of aluminum oxide-boron carbide (Al 2 O 3 --B 4 C) adapted for positioning in the annular space of concentrically disposed zircaloy tubes. Each tubular...
4462957 Sliding mechanism  
A sliding mechanism comprising two members maintained in sliding contact with each other, wherein one of the members (which may be a pin) is formed of an alloy consisting essentially of, by weight,...
4460540 Burnable poison rod for a nuclear reactor fuel assembly  
A burnable poison rod for use in a nuclear reactor fuel assembly which includes concentrically disposed rods having an annular space therebetween which extends the full length of the rods. The...
4431603 Self-actuated device  
A self-actuated device, of particular use as a valve or an orifice for nuclear reactor fuel and blanket assemblies, in which a gas produced by a neutron induced nuclear reaction gradually...
4400347 Absorber member for mounting in the lattice of a boiling water reactor  
An elongated absorber plate, which is stationarily mounted in a gap between two fuel assemblies in a reactor core, comprises a plurality of absorber channels which are filled with a burnable...
4400346 Control rods  
A control rod to be arranged in a nuclear reactor core comprises a body of a control rod, control rod guide rollers, pins connected to the guide rollers, and fixing members directly welded to the...
4381283 Control component structure  
A technique is provided for engaging and disengaging burnable poison rods from the spider in a fuel assembly. The cap on the end of each of the burnable poison rods is provided with a shank that is...
4367196 Neutronic reactor  
A nuclear reactor includes an active portion with fissionable fuel and neutron moderating material surrounded by neutron reflecting material. A control element in the active portion includes a...
4342284 Process for the coating of particles for the production of fuel and/or absorbing elements for nuclear reactors and apparatus therefor  
Fuel, fertile material and/or absorber material containing particles for fuel and/or absorber elements in nuclear reactors are coated by a process comprising introducing thermally cleavable gases...
4342722 Control rod for a nuclear reactor  
A control rod having a center of thermal neutron absorbing material is provided specifically for use within the core of a nuclear reactor, extending through the central zone of maximum flux...
4325785 Method and apparatus for measuring the reactivity of a spent fuel assembly  
An accurate determination of whether the reactivity of individual spent fuel assemblies exceeds a threshold value is made while each assembly is being transferred from the reactor core to the fuel...
4314885 Industrial technique  
A technique is provided for engaging and disengaging burnable poison rods from the spider in a fuel assembly. The cap on the end of each of the burnable poison rods is provided with a shank that is...
4311560 Stabilizing device for control rod tip  
A control rod having a spring device on its lower end for eliminating oscillatory contact of the rod against its adjacent guide tube wall. The base of the device is connected to the lower tip of...
4304631 Control component retainer  
A retainer to provide supplemental holddown force for a control component assembly latched into a fuel assembly of a nuclear reactor. Upon failure of latching mechanism the retainer precludes the...
4292132 Hydraulically centered control rod  
A control rod suspended to reciprocate in a guide tube of a nuclear fuel assembly has a hydraulic bearing formed at its lower tip. The bearing includes a plurality of discrete pockets on its outer...
4285769 Control cell nuclear reactor core  
A method and arrangement for operating a boiling water nuclear reactor and fuel assembly designs for such reactor wherein the reactor is operated with uniquely located control rods that serve the...
4246068 Boiling reactor with direct feed water input to the fuel boxes  
Boiling reactor comprising a reactor vessel and a moderator tank arranged therein which surrounds a reactor core with a plurality of vertically arranged fuel boxes. A moderator tank space located...
4235673 Chip sleeve for nuclear fuel elements  
Means for preventing chip penetration of fractured ceramic fuel into the cladding of a fast spectrum nuclear reactor fuel element is disclosed. Included in the fuel element external to the pellet...
4227967 Method and apparatus for reducing the power level in a nuclear reactor during temperature transient  
Apparatus for reducing the power level in a nuclear reactor during a transient increase in temperature of the primary coolant. The apparatus includes a neutron absorber and a thermally elongatable...
4204909 Temperature sensitive self-actuated scram mechanism  
A self-actuated mechanism within a safety assembly in a liquid metal nuclear reactor comprising sensor fuel pins located in a reactor coolant flow path, a sensor bulb containing NaK located near...
4192714 Reactor safety method  
This invention relates to safety means for preventing a gas cooled nuclear reactor from attaining criticality prior to start up in the event the reactor core is immersed in hydrogenous liquid. This...
4187145 Hydraulic latch scram release mechanism  
A poison bundle release mechanism within a safety assembly of a liquid metal nuclear reactor. A baffle consisting of a plate with recesses in fluid communication with low pressure coolant is formed...
4172762 High exposure control rod finger  
A nuclear reactor control rod containing a stack of B 4 C absorber pellets in which the pellets in the lower end have a radius smaller than that of the other pellets and are wrapped with a sleeve...
4155808 Nuclear fuel rod inspection structure  
A typical embodiment of the invention provides a fitting for stabilizing the burnable poison rods and the like within a nuclear reactor fuel element. An illustrative orifice rod assembly fitting is...
4088534 Casing for the fuel elements of a water-cooled nuclear reactor  
The casing is made up of a number of identical compartments of prismatic shape in which are placed vertically either one or a number of fuel element bundles which are not secured to the casing, the...
4086132 Combined fuel assembly and thimble plug gripper for a nuclear reactor  
A combined fuel assembly and thimble plug gripper for raising and lowering a fuel assembly into a nuclear reactor core, and for lifting and lowering a thimble plug assembly into the fuel assembly,...
Matches 101 - 150 out of 303 < 1 2 3 4 5 6 7 >