Class 376/904 - Moderator, reflector, or coolant materials

Subclass of Class 376 - Induced nuclear reactions: processes, systems, and elements
Definition: Subject matter wherein a specific moderator or coolant material
No. of patents: 31
Last issue date: 05/18/2004

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Number	Title	Issue Date
6738446	System and method for radioactive waste destruction A method for transmuting spent fuel from a nuclear reactor includes the step of separating the waste into components including a driver fuel component and a transmutation fuel component. The driver fuel, which includes fissile materials such as Plutonium239	05/18/2004
6674830	Nuclear reactor plant The subject of the present invention is to provide a nuclear reactor plant of which is a direct cycle nuclear reactor using a carbon dioxide as a coolant such that a heat evacuation for liquefying coolant is reduced while a compressive work is reduced by ...	01/06/2004
6625248	Process for the treatment of radioactive graphite A process for the treatment of radioactive graphite which includes the following steps: (i) reacting the radioactive graphite at a temperature in the range of from 250° C. to 900° C. with superheated steam or gases containing water vapor to form hydroge...	09/23/2003
5976066	Neutron capture therapies In one embodiment there is provided an application of the 10 B(n,଱)7 Li nuclear reaction or other neutron capture reactions for the treatment of rheumatoid arthritis. This application, called Boron Neutron Capture Synovectomy (...	11/02/1999
5949840	Neutron guide A neutron guide in which lengths of cylindrical glass tubing have rectangular glass plates properly dimensioned to allow insertion into the cylindrical glass tubing so that a sealed geometrically precise polygonal cross-section is formed in the cylindrica...	09/07/1999
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 fibre comprising the steps of: arranging in superimposed re...	04/02/1996
4950449	Inhibition of radioactive cobalt deposition in water-cooled nuclear reactors Deposition of radioactive cobalt on the interior surfaces of a water-cooled nuclear reactor and intergranular stress corrosion cracking are inhibited or substantially prevented by the continuous injection of zinc oxide to the reactor water. The zinc oxide...	08/21/1990
4941159	Low neutron fluence nuclear reactor internals A new design for nuclear reactor internals resulting in reduced fast neutron leakage to the reactor vessel. The first step of the two-stage process reflects high energy or fast neutrons back into the core, by placement of a reflector made of tungsten, sta...	07/10/1990
4830818	Ceramic installations A gas-cooled high temperature reactor having a core filled with spherical fuel elements is provided comprising a graphite side reflector including at least one nose-like projection comprised of a plurality of graphite nose stones stacked one upon the othe...	05/16/1989
4777016	Fuel assembly A fuel assembly including a channel box, upper and lower tie plates, fuel rods inserted in the channel box and held at upper and lower end portions by the upper and lower tie plates, a water rod disposed among the fuel rods and spacers for keeping the fue...	10/11/1988
4759900	Inhibition of radioactive cobalt deposition in water-cooled nuclear reactors Deposition of radioactive cobalt on the interior surfaces of a water-cooled nuclear reactor is inhibited or substantially prevented by the continuous injection of zinc oxide to the reactor water. The zinc oxide may be prepared in the form of a paste, a sl...	07/26/1988
4756869	Method of storing spent nuclear fuel elements For safety in storage and transport of nuclear fuel elements outside a nuclear reactor core, they are provided with a coating of a neutron-absorbing substance from a liquid phase, e.g. by immersion, spraying or pouring, utilizing a melt, a solution or imm...	07/12/1988
4756874	Minimization of radioactive material deposition in water-cooled nuclear reactors In water-cooled nuclear reactors where zinc is added to the water to remove or lessen the accumulation of radioactive cobalt, radioactivity arising from the zinc itself as a result of neutron capture is lessened or eliminated entirely by modifying the iso...	07/12/1988
4755350	Thermionic reactor module with thermal storage reservoir A thermionic energy conversion system assembly is described which comprises a fissionable nuclear fuel which surrounds a cylindrical arrangement of thermionic emitter electrodes which surround corresponding collector electrodes, which in turn surround a c...	07/05/1988
4730663	Passive cooling arrangement A passive cooling arrangement includes a primary hot-cooling circuit and a econdary convection cooling circuit. A condenser is arranged in the lower region of the convection cooling circuit. This condenser is provided for the medium of the hot-cooling circ...	03/15/1988
4645641	Process and installation to secure a prestressed concrete pressure vessel surrounded by a reactor protection building against excessive pressure and to prevent the release of activity to the environment A process and an installation for the securing against excessive pressure in a prestressed concrete pressure vessel of a gas cooled high temperature reactor and for the prevention of activity release into the environment. The process comprises three steps...	02/24/1987
4525186	Method for producing isotopically enriched helium-4 and use of same as nuclear reactor coolant Isotopically enriched helium-4, that is, helium-4 which is low in helium-3, is useful as a nuclear reactor coolant. It is produced from liquefied natural gas source helium by distilling helium-3 therefrom. The coolant is preferably enriched in hydrogen up...	06/25/1985
4464330	Apparatus for irradiating a continuously flowing stream of fluid An apparatus for irradiating a continuously flowing stream of fluid is diosed. The apparatus consists of a housing having a spherical cavity and a spherical moderator containing a radiation source positioned within the spherical cavity. The spherical mod...	08/07/1984
4435184	Method of recovering boric acid from waste-water concentrates of nuclear plants A waste-water concentrate containing boric acid together with chemical residues and radionuclides, especially from a nuclear power plant, is treated to recovering boric acid which can be recycled to the plant. According to the invention, the practically n...	03/06/1984
4382907	Liquid metal cooled nuclear reactor The nuclear boiler comprises at least one heat exchanger located externally of the reactor vessel in order to effect heat exchange between the liquid metal coolant in the form of liquid and water to be vaporized and superheated together with a main storag...	05/10/1983
4353864	Pressure regenerator A rotary steam boiler comprises a rotatable member mounted in a housing including heating means. The rotatable member comprises a shaft with a plurality of axially extending ducts arranged about the shaft and a plurality of pipes each having opposite ends...	10/12/1982
4344911	Fluidized wall for protecting fusion chamber walls Apparatus for protecting the inner wall of a fusion chamber from microexplosion debris, x-rays, neutrons, etc. produced by deuterium-tritium (DT) targets imploded within the fusion chamber. The apparatus utilizes a fluidized wall similar to a waterfall co...	08/17/1982
4343761	Heat transport system A falling bed of ceramic particles receives neutron irradiation from a neutron-producing plasma and thereby transports energy as heat from the plasma to a heat exchange location where the ceramic particles are cooled by a gas flow. The cooled ceramic part...	08/10/1982
4304634	Method for producing isotopically enriched helium-4 and use of same as nuclear reactor coolant Isotopically enriched helium-4, that is, helium-4 which is low in helium-3, is useful as a nuclear reactor coolant. It is produced from liquefied natural gas source helium by distilling helium-3 therefrom. The coolant is preferably enriched in hydrogen up...	12/08/1981
4303553	Neutron-protection heat insulating material A neutron protection thermal insulating material is obtained by adding a boron compound and, if necessary, a hydrous compound, to chrysotile asbestos fibers. To form the material, the asbestos is opened with the use of a surface active agent in the presen...	12/01/1981
4166003	Nuclear core and a reflector assembly therefor A nuclear core including a reflector assembly cooling arrangement utilizing a combination of forced and natural convection cooling. Forced convection cooling is achieved by using a low pressure gradient to drive coolant through the reflector assembly. Nat...	08/28/1979
4123328	Utilization of heavy elements in thermal and epithermal reactors Increases in reactivity can be obtained in thermal and epithermal reactors by utilization of heavy elements in selected locations in the reactors. These increases can result in economic gains, for example, in reduction in the amounts of heavy water needed...	10/31/1978
4111747	Packed rod neutron shield for fast nuclear reactors A fast neutron nuclear reactor including a core and a plurality of vertically oriented neutron shield assemblies surrounding the core. Each assembly includes closely packed cylindrical rods within a polygonal metallic duct. The shield assemblies are less ...	09/05/1978
4101375	Isotopically enriched helium-4 Isotopically enriched helium-4, that is to say, helium-4 which is low in helium-3, is useful as a nuclear reactor coolant. It is produced from liquefied natural gas source helium by removing helium-3 therefrom....	07/18/1978
4050252	Ocean nuclear power equipment A temperature differential power plant is combined with a nuclear power plant and employs the temperature differential between hot water discharged from cooling the nuclear reactor, steam obtained from the nuclear reactor, and cold water taken in from an ...	09/27/1977
3971699	Neutronic reactor 1. The method of operating a water-cooled neutronic reactor having a graphite moderator which comprises flowing a gaseous mixture of carbon dioxide and helium, in which the helium comprises 40-60 volume percent of the mixture, in contact with the graphite...	07/27/1976

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Class 376/904 - Moderator, reflector, or coolant materials