Class 376/347 - REACTOR STRUCTURES

Subclass of Class 376 - Induced nuclear reactions: processes, systems, and elements
Definition: Subject matter comprising the combination of two or more
No. of patents: 31
Last issue date: 12/08/2009

Number	Title	Issue Date
7630470	Method for making a flat zirconium alloy product, resulting flat product and fuel, assembly component for nuclear power plant reactor made from said flat product A method of fabricating a zirconium alloy flat product, the method being characterized by: preparing or casting a zirconium alloy ingot containing at least 95% by weight of zirconium, and including the usual impurities and alloying elements; shaping said ingot in or...	12/08/2009
7616728	Nuclear reactor internals alignment configuration An alignment system that employs jacking block assemblies and alignment posts around the periphery of the top plate of a nuclear reactor lower internals core shroud to align an upper core plate with the lower internals and the core shroud with the core barrel. The d...	11/10/2009
7349518	Boiling water reactor core and fuel assemblies therefor A ratio of the number of fuel assemblies loaded on a core to the number of control rod drive mechanisms is 3 or more. The fuel assembly itself contains mixed oxides of a low enrichment concentration uranium oxide containing 3 to 8 wt % in the average enrichment conc...	03/25/2008
7206372	Methods of repairing leaking elongate hollow members in boiling water reactors In a method for sealing a hollow, elongate member within a reactor pressure vessel of a nuclear reactor, a section of the elongate member may be removed to separate the elongate member into an upper portion and a lower portion with an opening there between. The lowe...	04/17/2007
7054296	Wireless local area network (WLAN) technology and applications including techniques of universal frequency translation Frequency translation and applications of same are described herein, including wireless local area network (WLAN) applications such as IEEE Standard 802.11 WLANs. Such applications include, but are not limited to, frequency down-conversion, frequency up-conversion, ...	05/30/2006
6925138	Reactor core and method for operating nuclear reactor The present invention is to provide a reactor core that allows a nuclear plant to continuously operate for a long term period, for example 15 years or longer, without requiring any fuel exchange, reduces the duration and number of maintenance steps involved in regul...	08/02/2005
6813328	Nuclear reactor submerged high temperature spool pump A fluid pump utilizing a canned rotor and canned stator is provided. The fluid pump has increased insulative properties over past “spool-type” pumps and has an increased ability to cool the stator, making it suitable for high temperature applications. A nuclear ...	11/02/2004
6771731	Device for storage of hazardous material A device (10) for storage of hazardous material, especially heat-producing hazardous material, such as radioactive spent nuclear reactor fuel, comprises a substantially cylindrical reinforced concrete body (12) and has an axially elongate storage space...	08/03/2004
6577697	Field analysis of geological samples using delayed neutron activation analysis A system and method for rapidly analyzing elemental abundances in rock or soil samples (14) under field conditions. The system uses a portable neutron source (12) to allow neutron activation analysis of elements having identifiable radioactive decay chara...	06/10/2003
6501814	Dry radioactive substance storage facility A dry radioactive substance storage facility stores spent fuel assemblies from nuclear power plants. The facility comprises a structure having a storage room storing storage tubes containing spent fuel assemblies. An air inlet duct defining an air inlet p...	12/31/2002
6351511	Local repair of top guide in boiling water reactor by installation of cruciform beam An apparatus for reinforcing weakened portions of the top guide assembly in a boiling water reactor. The repair apparatus includes a cruciform lattice segment which reinforces the damaged or weakened region of the top guide beam lattice. This cruciform la...	02/26/2002
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 least two structural grids spaced apart from each other, the ...	08/07/2001
6183243	Method of using nuclear waste to produce heat and power A method of using nuclear waste material and exploiting heat generated by radioactive decay of said radioactive waste, comprising the steps of incorporating solid nuclear waste into glass, ceramic, or cementitious blocks, covering the blocks in heat absor...	02/06/2001
5987088	Precipitation hardening type single crystal austenitic steel, and usage the same In order to provide an austenitic single crystal stainless steel having preferable stress corrosion cracking resistance, strength, and irradiation induced embrittlement resistance so as to extend the life of a nuclear reactor core structure, which is used...	11/16/1999
5844957	Reactor core A reactor core for a boiling water nuclear reactor includes a plurality of fuel assemblies (40) with a plurality of vertical fuel rods (10) and possibly occasional vertical water-filled rods or channels (32, 48, 49, 50, 51) which are surrounded by a fuel ...	12/01/1998
5838751	Core plate repair using guide tube gap wedges A method and an apparatus for repairing a core plate having a cracked support structure. The method entails the step of providing a vertical compression load path between the core plate and one or more control rod guide tubes. This is accomplished by inst...	11/17/1998
5646970	Core plate repair using control rod guide tube load transfer collar A method and an apparatus for repairing a core plate having a cracked support structure. The method entails the step of providing a vertical compression load path between the core plate and one or more control rod guide tubes. This is accomplished by inst...	07/08/1997
5553107	Pressurized water reactor vessel with slotted support columns A pressurized water nuclear reactor pressure vessel has an upper core support plate with passageways for the passage of coolant, an upper support plate above the upper core support plate, and peripheral hollow support columns extending upwardly above the ...	09/03/1996
5483563	Cleaning process for enhancing the bond integrity of multi-layered zirconium and zirconium alloy tubing Zirconium or zirconium alloy components of a cylindrical shape are cleaned with an ice blasting process to produce a defect-free bondline in multi-layered tubing suitable for nuclear fuel cladding and the chemical processing industry. The ice blasting pro...	01/09/1996
4822558	Thimble guide extender for a nuclear power plant A sleeve-like sealing unit, particularly a thimble guide extender is adapted to be installed on and coaxially with a thimble guide mounted on a lower core plate of a nuclear reaction vessel and projects toward and terminates at a distance from an underfac...	04/18/1989
4778647	Vibration-damping extender for a thimble guide A thimble guide extender for use in a nuclear power plant shields the thimble from turbulence and absorbs vibration from it to reduce wear. The extender includes an extension element which is secured to the thimble guide, a spring bushing which is attache...	10/18/1988
4765947	Probe guide duct device for a nuclear reactor A device is provided concerning probe guide ducts for allowing a probe to pass for carrying out measurements on the coolant at the outlet of the assemblies (6) of a nuclear reactor (1). It comprises sleeves (9) through which pass upper columns (12) groupi...	08/23/1988
4689091	Process for producing zirconium-based alloy In a process for producing a zirconium-based alloy in which after the zirconium-based alloy is subjected to hot plastic working, it is subjected to cold plastic working and then to annealing and these steps are repeated at least twice, the present inventi...	08/25/1987
4476088	Latching devices and nuclear reactors incorporating such latching devices A latching device for use in nuclear reactors. The device is used to latch outer housing assemblies to the reactor core. The device contains a shear pin which does not break under normal loading imposed by movement of absorber rod assemblies, but which sh...	10/09/1984
4327443	Capillary liquid fuel nuclear reactor Capillary liquid fuel elements, created by the method of confining a liquid fuel in horizontal capillary troughs, are employed to create the core of a nuclear reactor to generate useful heat energy. The reactor incorporates the inherent advantages of a li...	04/27/1982
4302290	Nuclear reactor vessel head equipment support structure A head equipment support structure system (HESS) (10) particularly adapted to be cooperatively associated with a nuclear reactor vessel (12) for purposes of effecting a separation of the electrical cables (30) that are utilized in the head area of such a ...	11/24/1981
4199403	Seismic core shroud An improved core shroud for a nuclear reactor employs cylindrical bands that surround a coolant boundary and reinforce it by means of support members that engage the coolant boundary and the bands....	04/22/1980
4182652	Nuclear fuel element, core for nuclear reactor, nuclear fuel material The nuclear fuel material includes up to 1% of plutonium and the remainder enriched uranium of an enrichment necessary to achieve a desired fissile content. A typical nuclear fuel material includes 0.160% fissile plutonium or 0.216% total plutonium and 99...	01/08/1980
4125433	Fuel assembly for a nuclear fast neutron reactor A fuel assembly for a nuclear fast neutron reactor comprises a shroud having an upstream head piece and a downstream tail piece. The shroud houses fuel elements having portions filled with fissionable and raw materials and plenums serving as accumulation ...	11/14/1978
4093514	Method of bringing nuclear power plant to fractional electrical load conditions A method of bringing a nuclear power plant to fractional electric load conditions, which power plant comprises at least two nuclear reactors, at least one nuclear reactor being a breeder and both reactors transferring heat to the turbine working substance...	06/06/1978
4070241	Nuclear reactor removable radial shielding assembly having a self-bowing feature A removable radial shielding assembly for use in the periphery of the core of a liquid-metal-cooled fast-breeder reactor, for closing interassembly gaps in the reactor core assembly load plane prior to reactor criticality and power operation to prevent po...	01/24/1978

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Class 376/347 - REACTOR STRUCTURES