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| Number | Title | Issue Date |
| 6662759 | Temporary plug cover for hole or port in steam generator of nuclear power plant A temporary cover is plugged into an open handhole or inspection port in a steam generator or another pressure vessel of a nuclear power plant after bolted covers are removed for maintenance inside the generator or vessel. The temporary cover may be locke... | 12/16/2003 |
| 6594333 | Thermal load reducing system for nuclear reactor vessel The present invention is used to reduce thermal load itself, being the cause to generate stress, which develops near liquid surface in a nuclear reactor wall and to contribute to further improvement of safety. A partition member (5) is arranged above a co... | 07/15/2003 |
| 6351510 | Nuclear plant A nuclear power plant comprising a casing which encloses a primary space, a reactor vessel arranged in the primary space, and a reactor core provided in the reactor vessel. The plant further comprises an upper space provided above the casing. The reactor ... | 02/26/2002 |
| 5577085 | Boiling water reactor with compact containment and simplified safety systems A nuclear reactor having a pressure vessel which is open at the top. The open top of the pressure vessel is closed by a steel dome. A containment, which is open at the top, extends upward from and is joined to the top of the pressure vessel and has an ope... | 11/19/1996 |
| 5513227 | Readily disconnectable nozzle arrangement for use with a nuclear reactor In order to reduce the time and difficulty of disassembling a seal arrangement in a cramped radioactive environment, a nozzle assembly hub is provided with a step bore which receives a seal arrangement, a compression collar, and a retaining nut which pres... | 04/30/1996 |
| 5426676 | Extrusion-resistant seal assembly Extrusion-resistant seal assembly for sealing a gap defined between a first structure spaced-apart from a second structure, which first structure and second structure may be an annular first flange and an annular second flange belonging to an instrumentat... | 06/20/1995 |
| 5406596 | Device for the sealed clamping against a support surface of an instrumentation column The device includes a removable supporting end piece (26) which comes to rest on the top end part of a support assembly (21) fixed to the end of a port adapter of the head of the vessel of a nuclear reactor, and a pressure plate (28) including an odd numb... | 04/11/1995 |
| 5377235 | Control rod canopy seal positioning and welding system A system is directed for remotely securing a canopy seal about a broken omega seal site between the control drive mechanism and the adapter tube of a nuclear reactor vessel so as to contain any radioactive leakage therebetween. The system includes a stalk... | 12/27/1994 |
| 5094809 | Device for the obturation and retention of a sealed closure plug of a steam generator tube The device comprises a threaded rod (11a) capable of being screwed into the threaded bore (10') traversing the core (10) and solid, at one of its ends, with a blocking element (11b) the external diameter of which is greater that the diameter of the rod (1... | 03/10/1992 |
| 4784561 | Device for the remote feeding of cylindrical pieces to an automatic machine, such as a machine plugging the tubes of a steam generator of a pressurized-water nuclear reactor The feed device comprises a housing (10) of sufficient size to contain a cylindrical piece (15), equipped with a removable cover (20), through which passes a nozzle (24) connected to a compressed-air distribution source (25, 26). A flexible pipe (11) is f... | 11/15/1988 |
| 4756879 | Core cover plug of a liquid metal-cooled nuclear reactor Core cover plug for a liquid metal-cooled nuclear reactor. It comprises a structure constituted in part by suspension elements fixed to the lower plate of the small rotary plug, and in part by control rod sleeve elements and a conical deflecting plate position... | 07/12/1988 |
| 4746485 | Rotating shielded crane system A rotating, radiation shielded crane system for use in a high radiation test cell, comprises a radiation shielding wall, a cylindrical ceiling made of radiation shielding material and a rotatable crane disposed above the ceiling. The ceiling rests on an a... | 05/24/1988 |
| 4712015 | Shields for nuclear reactors A roof shield for a nuclear reactor comprises a normally fixed radially outer portion, a radially inner portion rotatable about a vertical axis, and a connection between the inner and outer portions which permits relative angular movement between the port... | 12/08/1987 |
| 4705661 | Fast neutron nuclear reactor equipped with a central handling cell and a boxed slab A fast neutron nuclear reactor having a vessel filled with liquid metal and sealed in its upper part by a box slab having a central opening in which is placed a plug-cover-core overhanging the core of the reactor. The central opening is surmounted by a ce... | 11/10/1987 |
| 4698199 | Retractable duct connectors in a nuclear reactor In a nuclear reactor of the type in which the vault has a roof in which inner and outer rotatable shields are mounted, coolant is supplied to the roof and shields via duct penetrations which extend in the plane of rotation and can be brought into alignmen... | 10/06/1987 |
| 4587081 | Slab for closing the vessel of a fast neutron nuclear reactor Slab for closing a fast neutron nuclear reactor, comprising a first central annular part (10) the diameter of which is substantially equal to the diameter of the reactor vessel (5) and a second peripheral annular part (11) connected to the first part (10)... | 05/06/1986 |
| 4464334 | Fast neutron nuclear reactors The invention relates to a nuclear reactor cooled by a liquid metal contained in a vessel obturated by upper closing means, said latter essentially being constituted by a slab and rotating plugs. The upper closing means comprise at least one circuit for c... | 08/07/1984 |
| 4401619 | Nuclear reactor sealing system A liquid metal-cooled nuclear reactor sealing system. The nuclear reactor includes a vessel sealed at its upper end by a closure head. The closure head comprises at least two components, one of which is rotatable; and the two components define an annulus ... | 08/30/1983 |
| 4348354 | Semi-modular heat exchanger for nuclear reactors Heat exchanger of a nuclear reactor, whose vessel is sealed by a slab, the exchanger being of the type which has within a vertically axed outer ferrule a plurality of heat exchange modules with substantially straight tubes, each of the said modules having... | 09/07/1982 |
| 4341732 | Nuclear reactor dip seal Arrangements for sealing cover gas from the clearance spaces among primary vessel head structure components in a liquid metal cooled fast breeder nuclear reactor including a dip seal having a trough and blade respectively suspended from adjacent head stru... | 07/27/1982 |
| 4330370 | Seal and bearing arrangement for use in a nuclear reactor A combination seal and bearing arrangement for use in a nuclear reactor including a vessel and vessel cover is disclosed herein. The vessel cover itself includes at least one rotatable plug which serves to perform certain position related functions within... | 05/18/1982 |
| 4299662 | Connecting apparatus for limited rotary or rectilinear motion Apparatus for providing connection between two members movable in a horizontal plane with respect to each other in a rotary or linear fashion. The apparatus includes a set of horizontal shelves affixed to each of the two members, vertically aligned across... | 11/10/1981 |
| 4288292 | Connecting apparatus for limited rotary of rectilinear motion (II) Apparatus for providing connection between two members having relative movement in a horizontal plane in a rotary or linear fashion. The apparatus includes a set of vertical surfaces affixed to each of the members, laterally aligned across a selected vert... | 09/08/1981 |
| 4236971 | Apparatus for sealing a rotatable shield plug in a liquid metal nuclear reactor An apparatus for sealing a rotatable shield plug in a nuclear reactor having liquid metal coolant. The apparatus includes a dip-ring seal adapted to provide a fluid barrier between the liquid metal and the atmosphere and to permit rotation of the shield p... | 12/02/1980 |
| 4230526 | Liquid sodium dip seal maintenance system A system for spraying liquid sodium onto impurities associated with liquid dip seals of nuclear reactors. The liquid sodium mixing with the impurities dissolves the impurities in the liquid sodium. The liquid sodium having dissolved and diluted the impuri... | 10/28/1980 |
| 4214903 | Bismuth-tin-indium alloy Disclosed is a bismuth-tin-indium alloy consisting essentially of 53 to 76 weight % of bismuth, 22 to 35 weight % of tin and 2 to 12 weight % of indium. This alloy has excellent sealing property and oxidation resistance, and is suitable particularly to th... | 07/29/1980 |
| 4200172 | Radiation shielded movable work station apparatus Described is a movable work station apparatus including travelling-hoist supported tools and a vertically and rotarywise movable frame-carried radiation-shielded enclosure, or gondola, for working personnel involved in tube-bundle-replacement tasks perfor... | 04/29/1980 |
| 4192558 | Self-lubricating bearing A bearing with a lubricant reservoir that is capable of being refilled when the bearing and reservoir are submerged in a lubricant pool. The lubricant reservoir supplies lubricant to the bearing while the bearing allows a small amount of lubricant to leak... | 03/11/1980 |
| 4181572 | Closure head for a nuclear reactor A closure head for a nuclear reactor includes a stationary outer ring integral with the reactor vessel with a first rotatable plug disposed within the stationary outer ring and supported from the stationary outer ring by a bearing assembly. A sealing syst... | 01/01/1980 |
| 4135973 | Core disruptive accident margin seal Apparatus for sealing the annulus defined within a substantially cylindrical rotatable riser assembly and plug combination of a nuclear reactor closure head. The apparatus comprises an inflatable sealing mechanism disposed in one portion of the riser asse... | 01/23/1979 |
| 4116766 | Ultrasonic dip seal maintenance system A system for removing impurities from the surfaces of liquid dip seals and or wetting the metal surfaces of liquid dip seals in nuclear components. The system comprises an ultrasonic transducer that transmits ultrasonic vibrations along an ultrasonic probe... | 09/26/1978 |
| 4115193 | Nuclear reactor pressure vessel support system A support system for nuclear reactor pressure vessels which can withstand all possible combinations of stresses caused by a postulated core disrupting accident during reactor operation. The nuclear reactor pressure vessel is provided with a flange around ... | 09/19/1978 |
| 4113564 | Core disruptive accident margin seal An apparatus for sealing the annulus defined between a substantially cylindrical rotatable first riser assembly and plug combination disposed in a substantially cylindrical second riser assembly and plug combination of a nuclear reactor system. The appara... | 09/12/1978 |
| 4083718 | Bismuth-tin-indium-lead alloy Disclosed is a bismuth-tin-indium-lead alloy consisting essentially of 28 to 72 weight % of bismuth, 25 to 52 weight % of tin, 2 to 12 weight % of indium and 1 to 8 weight % of lead. This alloy has excellent sealing property and oxidation resistance, and ... | 04/11/1978 |
| 4080254 | Plug-to-plug gas transfer system A system for conducting a fluid from one component to another component of a nuclear reactor wherein at least one such component is a rotatable closure head plug capable of movement relative to the other component. The conducting system utilizes the annul... | 03/21/1978 |
| 4078969 | Core disruptive accident margin seal An apparatus for sealing the annulus defined between a substantially cylindrical rotatable first riser assembly and plug combination disposed in a substantially cylindrical second riser assembly and plug combination of a nuclear reactor system. The appara... | 03/14/1978 |
| 4071402 | Nuclear reactor apparatus A lifting, rotating and sealing apparatus for nuclear reactors utilizing rotating plugs above the nuclear reactor core. This apparatus permits rotation of the plugs to provide under the plug refueling of a nuclear core. It also provides a means by which p... | 01/31/1978 |
| 4069099 | Nuclear reactor fuel transfer system A system for transferring fuel assemblies between a nuclear reactor core and a fuel transfer area while the fuel assemblies remain completely submerged in a continuous body of coolant. The system comprises an in-vessel transfer machine and a valve capable... | 01/17/1978 |
| 4050987 | Rotating plug bearing and seal A bearing and seal structure for nuclear reactors utilizing rotating plugs above the nuclear reactor vessel. The structure permits lubrication of bearings and seals of the rotating plugs without risk of the lubricant draining into the reactor vessel below... | 09/27/1977 |
| 4026763 | Liquid-metal dip seal with pneumatic spring An improved liquid-metal dip seal for sealing the annulus between rotating plugs in the reactor vessel head of a liquid-metal fast-breeder nuclear reactor has two legs of differing widths communicating under a seal blade; the wide leg is also in communica... | 05/31/1977 |
