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| Number | Title | Issue Date |
| 7430266 | Procedure and means for replacing and procedure for repairing a section of a pipe in the primary circuit of a nuclear reactor Marking of the cuts which have to be made, cutting of the section at two ends, removal of the section which has to be replaced, bevelling of the joint ends of the parts remaining after the section has been cut out from the pipe, adjustment of a new or replacement se... | 09/30/2008 |
| 7206372 | Methods of repairing leaking elongate hollow members in boiling water reactors In a method for sealing a hollow, elongate member within a reactor pressure vessel of a nuclear reactor, a section of the elongate member may be removed to separate the elongate member into an upper portion and a lower portion with an opening there between. The lowe... | 04/17/2007 |
| 7203263 | Core spray apparatus and method for installing the same A core spray T-box attachment assembly for a core spray nozzle includes a primary cruciform wedge and a secondary cruciform wedge in contact with the primary cruciform wedge to form a cruciform wedge subassembly adapted for insertion within a bore of the core spray ... | 04/10/2007 |
| 7139356 | Procedure and means for replacing and procedure for repairing a section of a pipe in the primary circuit of a nuclear reactor Marking of the cuts which have to be made, cutting of the section at two ends, removal of the section which has to be replaced, bevelling of the joint ends of the parts remaining after the section has been cut out from the pipe, adjustment of a new or replacement se... | 11/21/2006 |
| 6834092 | Method of repairing leaking elongate hollow members in boiling water reactors The method facilitates sealing a control rod drive (CRD) housing to a stub tube in a reactor pressure vessel of a nuclear reactor, if any cracks develop proximate a heat affected zone of the stub tube at a CRD housing re-attachment weld. The method includes cutting ... | 12/21/2004 |
| 6421406 | Core spray upper T-box to safe end attachment A T-box assembly includes a T-box housing, a thermal sleeve coupled to the T-box housing, a cruciform wedge, a spider threadedly engaging the thermal sleeve, and a draw bolt coupling the cruciform wedge and the spider. At least one spring washer is locate... | 07/16/2002 |
| 6345084 | Apparatus and methods for replacing a core spray T-box/thermal sleeve in a nuclear reactor A T-box/thermal sleeve assembly replaces a damaged T-box/thermal sleeve in a core spray nozzle of a nuclear reactor. To replace the parts, the T-box and a portion of the extant thermal sleeve are removed from a location within the reactor vessel wall. The... | 02/05/2002 |
| 6201847 | Core spray upper T-box to reactor vessel attachment A T-box assembly to facilitate attaching a core spray line to a reactor core spray nozzle safe end without welding is described. In one embodiment, the T-box assembly includes a T-box housing, a cruciform wedge, and a draw bolt. The T-box housing is confi... | 03/13/2001 |
| 5892806 | Pressure tube spacer A spacer for maintaining a pressure tube in spaced relation with a caland tube of a nuclear reactor. The spacer comprising a split ring adapted to be disposed about the outer surface of said pressure tube. The ring has a central annular body portion with... | 04/06/1999 |
| 5796797 | Method for sealing a stub tube in a nuclear reactor A method for sealing cracks adjacent stub tube attachment welds in a reactor pressure vessel of a nuclear reactor is described. The reactor pressure vessel includes at least one stub tube through which a control rod housing extends. The control rod housin... | 08/18/1998 |
| 5793829 | Protective sleeve A protective sleeve includes an outer member and an inner member slidable within the outer member. The outer member has a tubular portion with a first end and a second end, and an attachment assembly is located at the first end of the tubular portion. The... | 08/11/1998 |
| 5785361 | Feedwater nozzle thermal sleeve A thermal sleeve for insertion into a feedwater nozzle bore of a reactor pressure vessel for a nuclear reactor is described. In one embodiment, the sleeve includes a substantially cylindrical main body and a substantially cylindrical interference ring. Th... | 07/28/1998 |
| 5725331 | Process for installating a tight crossing in the wall of a cell A tight crossing to ensure a high efficiency seal between the interior (1) and the exterior (2) of a high activity cell. The crossing comprises a sleeve (6) placed in the wall (3), a guide tube (11) placed within the sleeve (6) and a support flange (12) p... | 03/10/1998 |
| 5640434 | Miniaturized nuclear reactor utilizing improved pressure tube structural members The present invention relates to a miniaturized nuclear utilizing improved pressure tube structural members. More particularly, the present invention relates to a new miniaturized nuclear reactor utilizing novel structural members that are used to support... | 06/17/1997 |
| 5600689 | Method and apparatus for repairing boiling water reactor shrouds utilizing tie-rods with multiple longitudinal members A method and apparatus for repairing nuclear reactor core shrouds includes applying vertical compressive forces to the shroud in situ to urge opposed ends of the shroud toward one another using a plurality of tie-rods, each including a plurality of coaxia... | 02/04/1997 |
| 5591940 | Protective sleeve A protective sleeve includes a sleeve body and a cover, each having a generally semi-cylindrical cross-section. The cover includes a groove along its longitudinal edges for receiving a silicone chord sealing gasket. The sleeve body has a short cylindrical... | 01/07/1997 |
| 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 |
| 5461648 | Supercritical water oxidation reactor with a corrosion-resistant lining A supercritical water oxidation reactor includes a vessel with an interior urface, two cooling sections, a heat exchanger, an oxygenating section, a pump, and a trap. The interior surface of the vessel has a corrosion-resistant, artificial ceramic or diamo... | 10/24/1995 |
| 5386443 | Self-expanding waterproof cover for crane hook In order to provide a relatively inexpensive water-tight telescopic enclosure which can extend automatically upon demand, a tubular extension piece is reciprocally mounted on a container-like hook box structure. A tube seal which interconnects the hook bo... | 01/31/1995 |
| 5377242 | Method and system for emergency core cooling A nuclear reactor and emergency core cooling system. A nuclear reactor is provided with a cylinder around the core barrel that defines an annular channel therebetween. An injection nozzle is provided through the reactor vessel for delivery of emergency co... | 12/27/1994 |
| 5357547 | Vibration dampener for dampening vibration of a tubular member Vibration dampener for dampening vibration of a tubular member, such as an instrumentation tube of the type found in nuclear reactor pressure vessels. The instrumentation tube is received in an outer tubular member, such as a guide thimble tube. The vibra... | 10/18/1994 |
| 5282232 | Nuclear reactor upper internal equipment with cluster guide devices Upper internals for a nuclear reactor comprise an upper core plate and a plate which supports cluster guides tubes connecting the two plates together. The cluster guides project above the support plate. A bottom wall of the support plate is situated at a ... | 01/25/1994 |
| 5215707 | Instrument thimble tube shroud An instrument thimble tube shroud is disclosed which has a central cup surrounding an instrument thimble tube to prevent fluid flow about the thimble tube from causing excessive vibration and wear. A plurality of arms extend radially from the cup and have... | 06/01/1993 |
| 5196160 | Nuclear reactor head and process for obtaining same A process for improving nozzles extending substantially vertically through openings in the head of a nuclear reactor and which are circumferentially welded to the head through a weld lying on an inner surface of the head and on the adjacent outer surface ... | 03/23/1993 |
| 5170899 | Waterproof cover for crane hook A watertight cover for the hook, hook block and cables of a crane comprises a hook box, of a size to receive the hook, fixed to a first cover member, which is of a size to receive the hook block. A second cover member is telescopically carried on the firs... | 12/15/1992 |
| 5135708 | Method of injection to or near core inlet In order to supply emergency coolant directly to the core inlet of a nuclear reactor, a separate and distinct channel is located within the reactor vessel. This channel flows downward along the perimeter of the core barrel and discharges its emergency coo... | 08/04/1992 |
| 5091140 | Method of replacing a heater nozzle in a nuclear reactor pressurizer A replacement heater sleeve for nuclear reactor coolant system pressurizer and method for replacing a damaged original heater nozzle. The original heater and heater nozzle are removed from the pressurizer and the original bore is enlarged. An outer sleeve... | 02/25/1992 |
| 5037604 | Coffer dam for temporary shielding of reactor vessel internals A cylindrical coffer dam assembly is described for use in temporary shielding personnel from nuclear reactor stored internals' radiation. The coffer dam is made up of substantially equal segments small enough to pass through the equipment hatch of the rea... | 08/06/1991 |
| 4986112 | Composite pressure vessel for a nuclear environment A pressure vessel for fluids containing hydrogen and subjected to a neutron flux. The vessel comprises an inner sealing layer and an outer load bearing layer. The inner sealing layer is composed of a material having a radiation induced diametral deformati... | 01/22/1991 |
| 4983351 | Top head penetration, hydro-ball in-core instrumentation system A hydro-ball in-core instrumentation system employs detector strings each comprising a wire having radiation sensitive balls affixed diametrically at spaced positions therealong and opposite tip ends of which are transportable by fluid drag through interi... | 01/08/1991 |
| 4975241 | Wear-reduction-sleeve for thimbles A wear-reduction-sleeve for in-core-instrumentation thimbles of a pressurized water nuclear reactor having bottom mounted instrumentation to curtail flow induced excitation and increase support contact area in the region of thimble length which extends th... | 12/04/1990 |
| 4917853 | Pipe for supporting and positioning measuring devices in the core of a nuclear reactor The outer tubular shroud (14) of the measuring pipe (10) comprises a plurality of internally machined spacers (30), each intended to receive a set of measuring devices (32). The spacers (30) are connected by successive lengths of flexible tubing. The oute... | 04/17/1990 |
| 4888149 | Wear-reduction-shield for thimbles A wear-reduction-shield (40) for use between the core plate (24) and lower end fitting (26) of a pressurized water reactor (10) to reduce excessive wear of in-core-instrumentation thimbles (30) due to flow induced vibrations and resist fuel assembly tippi... | 12/19/1989 |
| 4848408 | Multi-layer compensator with spacers arranged between the layers Multi-layer compensator with spacers arranged between the layers and with the spacers having the shape of flat strips distributed parallel to the longitudinal axis of the compensator over the circumference, with a gap between spacers.... | 07/18/1989 |
| 4840096 | Device for machining chamfers on a free of a pipe The chamfering device comprises a frame to be centered and fixed coaxially within the pipe. A tool and its support are mounted concentrically around the frame and are movable along and about the axis in both translation and rotation by drive motors, and i... | 06/20/1989 |
| 4834935 | Feedwater sparger assembly A feedwater sparger assembly, and more particularly a thermal sleeve device, to prevent relatively cold feedwater from contacting the vulnerable surfaces of a feedwater nozzle in a boiling water nuclear reactor. Inner and outer concentric tubular thermal ... | 05/30/1989 |
| 4826217 | Apparatus and method for sealing a tube joint A joint between a pair of coaxial tubes which extend into a pressure vessel from a surface is sealed using a sleeve-like housing which surrounds the joint to be sealed. An upper fluid-tight seal is formed between the longer of the tubes and the housing. A... | 05/02/1989 |
| 4822558 | Thimble guide extender for a nuclear power plant A sleeve-like sealing unit, particularly a thimble guide extender is adapted to be installed on and coaxially with a thimble guide mounted on a lower core plate of a nuclear reaction vessel and projects toward and terminates at a distance from an underfac... | 04/18/1989 |
| 4801425 | Nuclear power plant having a metallic reactor pressure vessel A nuclear power plant includes a concrete biological shield, a metallic reactor pressure vessel surrounded by the concrete biological shield, coolant connector pieces connected to the reactor pressure vessel, coolant lines connected to the coolant connect... | 01/31/1989 |
| 4796653 | Method of enhancing residual compressive stress in double metallic tubes A method of enhancing residual compressive stress in a horizontal double metallic pipe which includes an outer pipe and an inner pipe fitted into the outer pipe. Cooling water is introduced into both the inner pipe and an annular space defined between the... | 01/10/1989 |
