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| Number | Title | Issue Date |
| 8031826 | Neutron absorber consisting of refractory metal infused with discrete neutron absorber The present invention provides a gray rod control assembly (GRCA) containing an improved neutron absorber comprised of a porous matrix of refractory metal infused with a neutron absorbing metal or metal alloy for a nuclear reactor. The reactor has a plurality of fue... | 10/04/2011 |
| 7873137 | Reactivity control arrangement and fast reactor A fast reactor including a reactivity control assembly including a reactor shutdown rod and neutron absorbers, a reactor shutdown rod drive mechanism, and units of neutron absorber drive mechanism. The reactor shutdown rod drive mechanism causes an inner extension t... | 01/18/2011 |
| 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 edge portion with a recess, which comprises outlets for said channel... | 01/13/2009 |
| 7469029 | 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 (2) comprises a free edge portion with a recess (7) which comprises a plurality of outlets, arranged in a row, for channels (3), which are ar... | 12/23/2008 |
| 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 the rod cladding, a rod internal arrangement configured in the internal... | 12/02/2008 |
| 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 its top end and by a bottom end plug at its bottom end and has a sup... | 09/09/2008 |
| 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 substantially transverse support grids, and a plurality of guide thim... | 08/12/2008 |
| 7295646 | Method for producing a coating for absorption of neutrons produced in nuclear reactions of radioactive materials The invention relates to a method for producing a coating for absorption of neutrons produced in nuclear reactions of radioactive material which can be applied in an economically feasible and simple manner, increases the effectivity of absorption, enables greater va... | 11/13/2007 |
| 7286626 | Neutron absorbing coating for nuclear criticality control A neutron absorbing coating for use on a substrate, and which provides nuclear criticality control is described and which includes a nickel, chromium, molybdenum, and gadolinium alloy having less than about 5% boron, by weight. ... | 10/23/2007 |
| 7222775 | Process for the metallization and/or brazing with a silicon alloy of parts made of an oxide ceramic unable to be wetted by the said alloy The invention relates to a process for the metallization with a silicon alloy melting at a temperature T1 of certain zones of the surface of a part made of an oxide ceramic unable to be wetted by the said alloy, the said process comprising, in succession, a step of ... | 05/29/2007 |
| 7139352 | Reactivity control rod for core A reactivity control rod adapted to be used in a reactor core of a fast reactor and disposed at a substantially central portion of the reactor core for controlling a reactivity therein. The reactivity control rod includes a wrapper tube surrounded by a plurality of ... | 11/21/2006 |
| 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 |
| 6914955 | Heat exchanger tube support structure A support plate for retaining tube array spacing within a heat exchanger tube and shell structure. The support plate having a plurality of individual tube receiving apertures formed therein. Each aperture has at least three inwardly protruding members and bights are... | 07/05/2005 |
| 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, each of the sheaths having a U-shaped cross section; and each of the ... | 04/19/2005 |
| 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 coincides with the radial direction of the control rod and the... | 11/23/2004 |
| 6813327 | Core support for an F-lattice core of a boiling water nuclear reactor A core plate assembly for a nuclear reactor includes a plurality of support beams, a flat plate positioned on top of the support beams, a plurality of control rod guide tube openings arranged in staggered rows, and a plurality of fuel supports extending through the ... | 11/02/2004 |
| 6741669 | Neutron absorber systems and method for absorbing neutrons A neutron absorber system for a nuclear fuel storage rack includes a neutron absorber, which is adapted to attach to a plurality of cell walls of a cell of the nuclear fuel storage rack. The neutron absorber is adapted to elastically deform to cause the attaching. A... | 05/25/2004 |
| 6735266 | 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, each of the sheaths having a U-shaped cross section; and each of the ... | 05/11/2004 |
| 6728328 | Safety control circuit for a neutronic reactor A neutronic reactor comprising an active portion containing material fissionable by neutrons of thermal energy, means to control a neutronic chain reaction within the reactor comprising a safety device and a regulating device, a safety device including means definin... | 04/27/2004 |
| 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 falling speed limiter mounted on a axially lower portion of ... | 11/25/2003 |
| 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 fixed to the tie rod and the blade. The method includes a fi... | 11/11/2003 |
| 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 every stepwise driving of a control rod cluster and which can... | 10/21/2003 |
| 6631176 | Fuel assembly A fuel assembly for a pressurized water reactor having control rod guide thimbles (5) each having a dashpot (12) for protecting against flexural deformation which may impair insatiability of a control rod. The fuel assembly includes, a plurality of contro... | 10/07/2003 |
| 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 hafnium secured to the bottom plug by a purely mechanical connectio... | 09/02/2003 |
| 6574295 | Boiling water type nuclear reactor use control rod In order to provide a boiling water type nuclear reactor use control rod with a guide use roller which improves corrosive environment at a clearance in the guide use roller and suppresses a generation of stress corrosion cracking while maintaining sliding... | 06/03/2003 |
| 6510192 | 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 arranged between the channel boxes. Long blade control rods, ea... | 01/21/2003 |
| 6506483 | Ceramic fiber debond coatings Non-oxide debond coated reinforcing fibers that are resistant to oxidation at temperatures above about 1200° C. are described. The debond coatings are non-hygroscopic, and exhibit debond performance equal to or better than the prior art such coatings. Th... | 01/14/2003 |
| 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 a central part (4) and four absorber blades (3) extending ... | 10/22/2002 |
| 6442227 | Sleeve assembly for nuclear fuel racks A sleeve assembly for refurbishing a fuel rack having cells in which fresh or spent nuclear fuel assemblies may be stored, in which the cells have elongate rack walls extending from a rack base plate and the rack base plate has flow holes communicating wi... | 08/27/2002 |
| 6411668 | Guide tube of a nuclear reactor fuel assembly A tubular blank (22) is rolled on a mandrel (14) in a pilgrim rolling mill. In a first rolling stage, a first part of the blank (22) is rolled on a first part (18, 19) of the mandrel (14), with a reduction of the outside diameter of the blank (22) to the ... | 06/25/2002 |
| 6409440 | Method for cutting a piece of sheet metal used to hold a layer of neutron-absorbing material on a wall of an atomic fuel assembly storage rack cell The present invention relates to a method for refurbishing an atomic fuel assembly storage rack the partitions (10) of which include a layer (14) of neutron-absorbing material between a wall (16) and a more or less rectangular piece of sheet metal (18) we... | 06/25/2002 |
| 6396893 | Apparatus and method for adjusting the weight of a velocity limiter for a control rod of a nuclear reactor The control rod includes an upper absorber section and a lower velocity limiter comprised of a socket, a vane, a transition piece and a set of fins. To adjust the weight of the control rod, lighter and heavier sets of fins, as well as lighter and heavier ... | 05/28/2002 |
| 6333955 | Control rod and manufacturing method for the control rod To reduce the manufacturing processes of a control rod and shorten the time required for manufacturing a control rod, for the lower part support member 7, the thin parts 11A and 11B are formed in the neighborhood of each of the left and right sides of the... | 12/25/2001 |
| 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 disposed in rows. The device includes an elongated outer membe... | 12/04/2001 |
| 6301320 | Nuclear fuel assembly having MOX rods and MOX-gadolinia rods Nuclear fuel assembly configurations are provided for mixed oxide fuels. Neutron poisons are provided within the MOX of certain fuel rods in the fuel assembly, those fuel rods being preferentially grouped towards the periphery of the fuel assembly. In thi... | 10/09/2001 |
| 6246741 | Fuel assembly A fuel assembly for a pressurized water reactor having control rod guide thimbles (5) each having a dashpot (12) for protecting against flexural deformation which may impair insertability of a control rod The fuel assembly includes, a plurality of control... | 06/12/2001 |
| 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.... | 06/12/2001 |
| 6226341 | Safety device for a neutronic reactor A neutronic reactor comprising an active portion containing material fissionable by neutrons of thermal energy, means to control a neutronic chain reaction within the reactor comprising a safety device and a regulating device, a safety device including me... | 05/01/2001 |
| 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 arranged between the channel boxes. Latitudinal long blade cont... | 03/20/2001 |
| 6167104 | Pressurized water reactor fuel assembly with a guide tube and method for producing the guide tube A pressurized water reactor fuel assembly with a guide tube and a method for producing a guide tube for control elements are provided. Such guide tubes in pressurized water nuclear reactors which are composed of zirconium alloys (zircaloy-2 and zircaloy-4... | 12/26/2000 |
