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Class 376/427 - In solid moderator block


Subclass of Class 376 - Induced nuclear reactions: processes, systems, and elements
Definition: Subject matter wherein the structure for attenuating neutron
No. of patents: 33
Last issue date: 08/22/2006


NumberTitleIssue Date
7094614In-situ monitoring of chemical vapor deposition process by mass spectrometry
A method and apparatus are provided for controlling a CVD process used to deposit films on semiconductor substrates wherein the by-products of the reaction are measured and monitored during the reaction preferably using mass spectrometry and the results used to calc...
08/22/2006
6665366Monobloc fuel element and boiling water and fast spectrum nuclear reactor using such elements
A single piece fuel element and fast spectrum boiling water reactor using such a single piece fuel element. The single piece fuel element is formed from coated fissile particles embedded in a matrix made from a material such as SiC that is inert to all fi...
12/16/2003
6233299Assembly for transmutation of a long-lived radioactive material
A new transmutation assembly permits an efficient transmutation of a long-lived radioactive material (long-lived FP nuclides such as technetium-99 or iodine-129) which was produced in the nuclear reactor. Wire-type members of a long-lived radioactive mate...
05/15/2001
5805657Nuclear fuel elements made from nanophase materials
A nuclear reactor core fuel element is composed of nanophase high temperature materials. An array of the fuel elements in rod form are joined in an open geometry fuel cell that preferably also uses such nanophase materials for the cell structures. The par...
09/08/1998
5724398Nuclear fuel elements
A nuclear fuel element for use in a gas cooled nuclear reactor, such as a Magnox reactor, has a plurality of fuel pin supports defining an element axis passing through the supports. Suspended between the supports are a plurality of fuel pins formed by a s...
03/03/1998
5410578Nuclear propulsion rocket
A nuclear propulsion reactor. A pressure vessel is provided with a reactor core that is surrounded by a radial reflector. Nuclear fuel elements in the core are formed from a hexagonal housing made from a high performance moderator and having a plurality o...
04/25/1995
5192495Sic barrier overcoating and infiltration of fuel compact
Nuclear fuel compacts, containing thousands of individually coated fuel particles in a carbonaceous matrix, are provided with an overcoating of silicon carbide which can be readily inspected for defects. This overcoating helps retain fission products with...
03/09/1993
5094804Nuclear fuel elements and method of making same
A nuclear fuel element for a high temperature gas nuclear reactor that has an average operating temperature in excess of 2000° C., and a method of making such a fuel element. The fuel element is characterized by having fissionable fuel material localized...
03/10/1992
5089219Gas cooled nuclear fuel element
A gas cooled nuclear fuel element. A cylindrical tube having an open lower end contains nuclear fuel disks stacked one upon the other to define an annular space between the tube and disks. An upper and a lower end fitting in the tube support the stack of ...
02/18/1992
5015437Graphite core blocks for high temperature gas-cooled reactor
A reactor core for a gas-cooled reactor, which core is composed of a plurality of prismatic bodies (2) of graphite containing nuclear fuel and having a top wall, a bottom wall and a plurality of vertically extending side walls, each graphite body (2) bein...
05/14/1991
4759911Gas cooled nuclear fuel element
A gas cooled nuclear fuel element. A plurality of progressively sized rigid porous cylinders nested together in coaxial alignment are provided with varying quantities of nuclear fuel to enhance the power density while remaining within temperature limitati...
07/26/1988
4704248High performance fuel element with end seal
A nuclear fuel element comprising an elongate block of refractory material having a generally regular polygonal cross section. The block includes parallel, spaced, first and second end surfaces. The first end surface has a peripheral sealing flange formed...
11/03/1987
4569820Nuclear reactor core and fuel element therefor
The present invention relates to a nuclear reactor core and fuel elements therefore. Stackable fuel elements, having the usual coolant holes machined therethrough, are formed with grooves along their vertical extent for alignment with similar grooves on a...
02/11/1986
4547334Low exchange element for nuclear reactor
A flow exchange element is presented which lowers temperature gradients in fuel elements and reduces maximum local temperature within high temperature gas-cooled reactors. The flow exchange element is inserted within a column of fuel elements where it ser...
10/15/1985
4522781Integral nuclear fuel element assembly
An integral nuclear fuel element assembly utilizes longitudinally finned fuel pins. The continuous or interrupted fins of the fuel pins are brazed to fins of juxtaposed fuel pins or directly to the juxtaposed fuel pins or both. The integrally brazed fuel ...
06/11/1985
4271101Process for the production of spherical-shaped fuel elements for high temperature reactors
Nearly isotropic spherical fuel elements of high strength and high heavy metal content for gas cooled high temperature reactors consisting of a fissile and fertile fuel material containing nucleus and a fuel free shell are prepared by preliminarily compre...
06/02/1981
4113563Fuel arrangement for high temperature gas cooled reactor
A fuel arrangement for a high temperature gas cooled reactor including fuel assemblies with separate directly cooled fissile and fertile fuel elements removably inserted in an elongated moderator block also having a passageway for control elements....
09/12/1978
4093682Process for the production of block-shaped fuel elements for high temperature reactors
Block fuel element for high temperature reactors are produced by hot molding of a granulated graphite material consisting of natural graphite powder, synthetic graphite powder, phenolformaldehyde binder resin and stearic acid as a lubricant together with ...
06/06/1978
4092498Neutronic reactor
A graphite-moderated, water-cooled nuclear reactor including a plurality of rectangular graphite blocks stacked in abutting relationship in layers, alternate layers having axes which are normal to one another, alternate rows of blocks in alternate layers ...
05/30/1978
4086133Nuclear reactor core refueling method
A method for refueling a nuclear reactor core inside a pressure vessel is described. The method is used with a core which has at least one region comprised of a plurality of layers, each layer being comprised of a plurality of individual fuel elements wit...
04/25/1978
4076775Block fuel elements for high temperature power reactors
Block fuel elements are prepared according to application Ser. No. 218,244 of Jan. 17, 1972, and now abandoned, from isotropic graphite granulates and coated fuel particles solely by pressing and without any mechanical processing. The cooling channels are...
02/28/1978
4060454Nuclear fuel element and method for making same
A nuclear fuel element and a method for making the fuel element are described. The fuel element comprises a graphite block in which elongated holes are filled with nuclear fuel. The nuclear fuel in each of the holes comprises a plurality of fuel rod segme...
11/29/1977
4040902Method for axially shuffling fuel elements in a nuclear reactor
A method for axially shuffling fuel elements in a nuclear reactor is disclosed wherein column vacancies are created in a manner to allow substantially lateral transfer of a selected number of fuel elements from another adjacent column to a vacated column,...
08/09/1977
4036920Process for the preparation of fuel kernels
A process for the preparation fuel kernels for coated particle fuels for use in a high temperature gas-cooled reactor comprising granulating a blend of ଲ-1,4-glucan powder, a fissile metal compound such as a thorium, uranium or plutonium compound an...
07/19/1977
4021298Conversion of coal into hydrocarbons
Hydrocarbons are formed of coal and water. The water is converted or dissociated separately into hydrogen and oxygen in a first chemical reactor by thermochemical and/or electrolytic processing. The resulting hydrogen is then reacted with the coal in a se...
05/03/1977
4017567Process for the production of block fuel elements for gas cooled high temperature power reactor
Molded block fuel elements having an isotropic structure useful for gas cooled high temperature power reactors are prepared by first producing an isotropic graphite granulate of high density with a definite porosity from a molding powder and then hot pres...
04/12/1977
4013760Process for the production of isotropic pyrolytic carbon particles
Graphite or carbon molded articles of high isotropy and high heat conductivity, especially useful for high temperature reactor fuel elements are prepared by pressing a mixture of a binder and a powdery carbon filler which consists partially or wholly of p...
03/22/1977
4004973Neutronic reactor
A graphite-moderated nuclear reactor includes channels between blocks of graphite and also includes spacer blocks between adjacent channeled blocks with an axis of extension normal to that of the axis of elongation of the channeled blocks to minimize chan...
01/25/1977
4000039Fuel elements for high temperature reactors having special suitability for reuse of the structural graphite
There are prepared fuel elements for high temperature reactors from which the fuel zone can be removed from the structural graphite after the burnup of the fissile material has taken place so that the fuel element can be filled with new fuel and again pla...
12/28/1976
3992258Coated nuclear fuel particles and process for making the same
An improved nuclear fuel particle comprises (a) a generally spherical low density kernel of a fissile element having a void volume of at least 40 percent of the physical volume of the kernel in order to accommodate fission gases generated during the use o...
11/16/1976
3988397Pressed block fuel elements for gas cooled high temperature power reactors and processes for their production
Block fuel elements for high temperature power reactors that can be reprocessed simply are prepared in which the feed and breed zones are connected with the graphite matrix directly and without transition. They are disposed separately from each other in s...
10/26/1976
3985844Process for the production of prismatic graphite molded articles for high temperature fuel elements
Prismatic graphite molded objects for high temperature fuel elements are prepared by producing the outer geometry and the holes for cooling channels and for receiving fuel and fertile materials in the formation of the carbon object....
10/12/1976
3968007Neutronic reactor construction
1. A neutronic reactor comprising a moderator including horizontal layers formed of horizontal rows of graphite blocks, alternate layers of blocks having the rows extending in one direction, the remaining alternate layers having the rows extending transve...
07/06/1976
 
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