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| Number | Title | Issue Date |
| 7302917 | Chemical cleaning of a steam generator during mode 5 generator shut down A Nuclear Steam Supply Stem (NSSS) Mode 5 Steam Generator Chemical Cleaning system is disclosed which applies chemical cleaning solvent (formulated to remove SG deposits) to the secondary side of the SG using primary side supplied heat during NSS Mode 5 shutdown to ... | 12/04/2007 |
| 7162981 | System for annulus tooling alignment with suction pickup in the stay dome on the secondary side of a steam generator A system is provided for delivering tooling, suction pickup, and alignment platforms to a stay dome region of a stem generator or the tube-free lane regions adjacent to the stay dome region and includes a suction device positioned in the stay dome region of a steam ... | 01/16/2007 |
| 7080888 | Dual nozzle hydro-demolition system A dual nozzle hydro-demolition system is mounted on a robot vehicle having a tower, with the robot vehicle and tower permitting the device to be positioned in any desired location on a vertical wall surface. The robot vehicle includes a plurality of tires and a moti... | 07/25/2006 |
| 7042966 | Method of estimating the signal-to-noise ratio in a telecommunications receiver and an application of the method to controlling a transmitter A method for estimating a signal-to-noise ratio, in particular digital, received by a radio communication receiver. The method includes estimating separately the signal and the noise and filtering (36, 44) separately the signal (Eb) and the noise (... | 05/09/2006 |
| 6950489 | Guide tube for an instrumentation lance extending into a pressure vessel, reactor pressure vessel, and a method for preventing the accumulation of particles outside the pressure vessel in a guide tube The invention relates to a guide tube especially for an instrumentation lance extending into a reactor pressure vessel. The guide tube includes a lower tube section and an upper tube section that extends into the interior of the reactor pressure vessel. In order to ... | 09/27/2005 |
| 6921515 | Apparatus for chemical decontamination In a chemical decontamination apparatus, a catalyst decomposition column in an upstream side of an ion exchange resin column and a hydrogen peroxide injection apparatus in a further upstream side, reduce the amount of waste products caused by a chemical decontaminat... | 07/26/2005 |
| 6718002 | Method and device for removing radioactive deposits A device and method for removing radioactive crud material deposited on surfaces of a nuclear fuel assembly in a nuclear plant is provided. The device comprises a container arranged to accommodate the nuclear fuel assembly, a first pumping means to pump a fluid, com... | 04/06/2004 |
| 6639962 | Preventive maintenance method and apparatus of a structural member in a reactor pressure vessel A preventive maintenance method and apparatus for a structural member in a reactor pressure vessel according to the present invention reduce a tensile residual stress on a surface of the structural member by impinging a water jet from a nozzle onto a plan... | 10/28/2003 |
| 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 |
| 6513462 | Descaling device for steam generator A scale removing device for removes scale adhering to the interior of a shell-and-tube-heat-exchanger-type steam generator. The scale removing device is provided with a flexible lance (58) holding a high-pressure water hose (91) movable with respect to a ... | 02/04/2003 |
| 6430249 | Polymer dispersants and methods of use in a nuclear steam generator A novel high-purity polymer dispersant and sludge conditioner added to the feedwater entering the secondary side of a nuclear steam generator for minimizing the accumulation of metal-oxide deposits within the nuclear steam generator during the continuing ... | 08/06/2002 |
| 6345083 | Preventive maintenance method and apparatus of a structural member in a reactor pressure vessel A preventive maintenance method and apparatus for a structural member in a reactor pressure vessel according to the present invention reduce a tensile residual stress on a surface of the structural member by impinging a water jet from a nozzle onto a plan... | 02/05/2002 |
| 6341151 | Preventive maintenance method and apparatus of a structural member in a reactor pressure vessel A preventive maintenance method and apparatus for a structural member in a reactor pressure vessel according to the present invention reduce a tensile residual stress on a surface of the structural member by impinging a water jet from a nozzle onto a plan... | 01/22/2002 |
| 6240155 | Preventive maintenance apparatus for structural members in a nuclear pressure vessel A method of performing maintenance on a structural member inside a reactor pressure vessel includes lowering an annular guide rail having a second lug until the guide rail rests on an upper flange of a core shroud provided inside the reactor pressure vess... | 05/29/2001 |
| 6058153 | Preventive maintenance apparatus for structural members in a nuclear pressure vessel A preventive maintenance apparatus for structural members inside a nuclear reactor pressure vessel includes a ring-shaped guide rail having a plurality of lugs which is placed on an upper flange of a core shroud provided inside a reactor pressure vessel. ... | 05/02/2000 |
| 6049580 | Apparatus for remote dismantling of irradiated structures The proposed installation comprises an abrasive liquid jet cutting module using a mobile nozzle (25) rotatable in all directions and which also supports a sensor (37) so that it can previously recognize the position or shape of the structure to be cut, a ... | 04/11/2000 |
| 6018557 | Methods and assemblies for cleaning a control rod guide in a nuclear reactor Methods and assemblies for cleaning a control rod guide tube in a nuclear reactor are described. An assembly, in accordance with one embodiment, includes a support housing and a flush tube. The support housing includes a bore extending between its first a... | 01/25/2000 |
| 5841826 | Method of using a chemical solution to dislodge and dislocate scale, sludge and other deposits from nuclear steam generators A method for dislodging and dislocating scale, sludge, corrosion and other deposits from heat transfer equipment surfaces, such as boiler and heat exchanger surfaces in steam generation systems, which are in contact with aqueous systems. This invention re... | 11/24/1998 |
| 5764717 | Chemical cleaning method for the removal of scale sludge and other deposits from nuclear steam generators An improved method for removing scale, sludge, corrosion and other debris and deposits from the interior of a heat exchanger vessel such as a nuclear steam generator, includes generating pressure pulses in a non-corrosive, strongly basic, amine-containing... | 06/09/1998 |
| 5742654 | Method and apparatus for enhancing removal of corrosion products from a nuclear reactor piping system Method and apparatus for enhancing removal of corrosion products from a nuclear reactor piping system. A reagent is supplied into a multi-part reactor piping system to react with the corrosion products therein. The corrosion products dissolve into the rea... | 04/21/1998 |
| 5570969 | Composite waterlance and cavity connection An improved composite waterlance and cavity connection is described where fiber reinforcements longitudinally extend through the body (24) of waterlance (10) and are inserted into a wedge shaped cavity at the top (18a) and bottom (18b) of a front manifold... | 11/05/1996 |
| 5553106 | Residual stress improving method for members in reactor pressure vessel Low temperature water in a low temperature water tank 12 installed outside a reactor pressure vessel 9 is pumped by a high pressure pump 15 and supplied through a conductor 17 under pressure. The supplied water is ejected, as a stream of cold water jet 8,... | 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 |
| 5467791 | Ultrasonic cleaning method and device therefor An ultrasonic cleaning device for cleaning a fuel assembly constituting an item to be cleaned, includes: a plurality of ultrasonic transducers which irradiate the outside of this item to be cleaned with ultrasonic waves from at least two directions; an ul... | 11/21/1995 |
| 5418824 | In situ inlet mixer cleaning system An apparatus for cleaning inlet mixers while they remain in their operating position within a nuclear reactor. A cleaning tool is inserted by remote control into the inlet mixer via a secondary inlet opening. Following insertion of the cleaning tool, the ... | 05/23/1995 |
| 5413168 | Cleaning method for heat exchangers An improved method for cleaning heat exchangers, wherein a first liquid containing a cleaning agent is used to remove substantially all of the accumulated sludge and deposits from the surfaces of the heat exchanger, and a second liquid containing a cleani... | 05/09/1995 |
| 5406595 | Device for sealing a lead-through A device for closing and sealing a lead-through (1), comprising means intended to open, clean and again close the lead-through. A cone (2) with a head (21), a rod-shaped part (22) and a sealing surface (23) arranged between said head and said rod-shaped p... | 04/11/1995 |
| 5388131 | Method and device for machining the internal surface of a tubular component and in particular an adaptor fixed to the vessel head of a pressurized water nuclear reactor A high-speed abrasive liquid jet is directed at the surface of the component (13) with an angle of incidence between 30° and 90°. The jet is moved so as to sweep over the internal surface of the component (13). At least two successive machining passes a... | 02/07/1995 |
| 5361286 | Method for in situ cleaning of inlet mixers A method for cleaning inlet mixers while they remain in their operating position within a nuclear reactor. A water-powered cleaning tool is inserted by remote control into the inlet mixer via a secondary inlet opening. Following insertion of the cleaning ... | 11/01/1994 |
| 5347557 | Apparatus for decontaminating radioactively contaminated surfaces An apparatus decontaminates a radioactively contaminated surface region of a pipe, connector or vessel being open at one end, with a dry mechanical blasting medium. The apparatus includes a processing bell to be mounted on the open end of the pipe, connec... | 09/13/1994 |
| 5341406 | Sliding lance guide flexible lance system A sliding lance guide flexible lance system (10) is attached to a hand hole (12) of a nuclear power plant steam generator by means of flange (14) of tilt module (16). A rail (18) extends from the tilt module (16) to a support stand (20) and is attached to... | 08/23/1994 |
| 5305361 | Method of and apparatus for water-jet peening A water jet peening method in which a pressurized water jet flow containing cavities is jetted through a nozzle having a velocity increasing orifice portion and a horn-like jetting hole formed continuously with the velocity increasing orifice portion to i... | 04/19/1994 |
| 5267283 | Nuclear reactor In addition to the metal-fiber filter and molecular sieve of a depressurization system for the containment vessel of a nuclear reactor, within an auxiliary equipment building adjacent the structure surrounding the containment vessel, at least one metal-fi... | 11/30/1993 |
| 5265129 | Support plate inspection device A device for inspecting the support plates and tube sheet of a nuclear steam generator. The device comprises a boom for extending into an access port of a steam generator and into a lane separating two rows of members, the boom being uprightable within th... | 11/23/1993 |
| 5259446 | Pressure pulse cleaning for adsorption tower distributors An on-line method and apparatus for dislodging deposits from the distributors (12) in an adsorption tower (10) thereby cleaning the tower (10) by causing a surge in a fluid to dislodge the blocked openings (14) of the distributors (12).... | 11/09/1993 |
| 5257296 | Steam generator chemical solvent mixing system and method A steam generator chemical solvent mixing system and method is provided. The chemical solvent mixing system includes a pump, having a discharge port fluidly connected to a discharge line and a suction port fluidly connected to a suction line. An upper lev... | 10/26/1993 |
| 5227127 | Filtered venting system for reactor containment vessel of nuclear power plant A filtered venting system located in association with a reactor containment vessel installed in a reactor building comprises a filter device disposed in the reactor building and including filter means, a first venting line disposed on an upstream side of ... | 07/13/1993 |
| 5217677 | Control rod drive assembly A control rod drive assembly includes a translatable drive tube joined to a control rod by a coupling having complementary screw threads. A purge flow is channeled between the screw threads to flush away debris therebetween for preventing galling of the t... | 06/08/1993 |
| 5205174 | Scavenger submersible visual and acoustical tank inspection system and method The present invention is an apparatus and method of preparing and inspecting a submerged surface of a fluid reservoir. The apparatus includes a chassis sized and shaped to provide an optimally low center of gravity, a propulsion system comprising two inde... | 04/27/1993 |
| 5194217 | Articulated sludge lance with a movable extension nozzle An improved articulated sludge lance with a retractable movable extension nozzle for cleaning a steam generator. The extension nozzle includes a flexible conduit adapted to be moved with a wire cable to place the nozzle in close proximity to a support pla... | 03/16/1993 |
