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| Number | Title | Issue Date |
| 7272204 | Method and apparatus for clamping a riser brace assembly in nuclear reactor An apparatus and method are provided which are designed to structurally replace welds that attach a riser brace assembly to a jet pump riser pipe. The riser brace assembly may include an upper clamp assembly, a lower clamp assembly, and a plurality of mechanical fas... | 09/18/2007 |
| 7023949 | Jet pump assembly repair method A BWR jet pump assembly has a wedge slidably mounted on a jet pump that is movable under the force of gravity to seat between a bracket and the jet pump in order to horizontally support the jet pump against vibrations. The wedge or the bracket is repaired in situ by... | 04/04/2006 |
| 6912263 | Method and device for feeding at least one steam generator of a pressurized-water nuclear reactor during periods of reactor shutdown At least one injector condenser (20) is used to supply secondary feedwater to the steam generator (1) during a phase in the course of which the temperature and the pressure of the coolant of the reactor coolant system (2) of the nuclear reactor ... | 06/28/2005 |
| 6876715 | Measurement system of torsion vibration for reactor internal pump Object of this invention is to provide an axial torsional vibration measurement device of the reactor internal pump capable of measuring the axial torsional vibration easily. The vibration detector 2 that detects vibration in the radial direction, and the sou... | 04/05/2005 |
| 6751281 | Measurement system of torsion vibration for reactor internal pump Object of this invention is to provide an axial torsional vibration measurement device of the reactor internal pump capable of measuring the axial torsional vibration easily. The vibration detector 2 that detects vibration in the radial direction, and the sou... | 06/15/2004 |
| 6595163 | High pressure steam water injector comprising an axial drain The steam injector is characteristic in its high pressure and improved start-up. It uses an axial drain (10) positioned in the centre of the neck (5) downstream from the mixing chamber (4) and inserted in the diffuser (7) for the purpose of narrowing the ... | 07/22/2003 |
| 6504888 | Apparatus and methods of flow measurement for a boiling water reactor internal pump A reactor pressure vessel (RPV) for a nuclear reactor that permits measurement of the flow through each reactor internal pump (RIP) is described. The reactor pressure vessel also includes at least one reactor internal pump that includes an impeller and a ... | 01/07/2003 |
| 6490331 | Jet pump spring wedge A remotely installable piping support device includes a pair of mating tapered wedge segments extending from lever arms connected with a spiral wound spring. The spring is machined integrally with the left lever arm and has a projecting center square driv... | 12/03/2002 |
| 6438192 | Jet pump slip joint seal A seal apparatus for a jet pump slip joint in a boiling water nuclear reactor pressure vessel, in an exemplary embodiment, includes a split seal ring and a segmented diaphragm spring engaging the split seal ring at an inner circumference of the diaphragm ... | 08/20/2002 |
| 6434208 | Jet pump beam lock A jet pump beam bolt locking assembly includes a locking sleeve having a plurality of ratchet teeth extending around the periphery of a base portion, and a lock plate having a beam bolt opening, and an integral beam spring arm having a plurality of ratche... | 08/13/2002 |
| 6320923 | BWR jet pump wedge keeper A locking device for use in restraining a jet pump downcomer of a nuclear reactor, including an upper jaw; a lower jaw placed in an opposing position below the upper jaw; and a tightening screw movably supporting the upper jaw and the lower jaw. When inst... | 11/20/2001 |
| 6108391 | Apparatus for performing jet pump riser pipe repairs Apparatus for supporting the lower elbow assembly of a jet pump in a reactor pressure vessel (RPV) of a nuclear reactor are described. The clamp apparatus includes a lower clamp element and an upper clamp element. The upper and lower elements are configur... | 08/22/2000 |
| 6052425 | Jet pump auxiliary wedge An auxiliary wedge apparatus configured to couple to the restrainer bracket of a jet pump assembly is described. In one embodiment, the auxiliary wedge apparatus includes a support block configured to couple to the restrainer bracket, and a wedge configur... | 04/18/2000 |
| 5943384 | Depressurization system for pressurized steam operated plant A depressurization system (1) for pressurized steam operated plant employing injection of cold water contained in a superelevated tank (5), said injection being triggered rapidly and in a manner independent of the magnitude of the damage and of the presen... | 08/24/1999 |
| 5896435 | Pressurized water supply device for a steam injector water source The injector (B) designed specifically to supply a steam generator (G) with water at high pressure when necessary, is supplied by steam that may originate from the generator itself, and by pressurized water from an ejector (C) supplied during the start up... | 04/20/1999 |
| 5796798 | Internal condenser vapor discharge system Internal condenser system for discharging vapor from a circuit into a tank or pool to reduce pressure in said circuit. The internal condensation conduit (47) comprises a diaphragm (52) just upstream of a cold liquid feed orifice (55); the jet of vapor passing ... | 08/18/1998 |
| 5661769 | Depressurising system for plants operating with pressurized steam A depressurizing system (1) for depressurizing plants, operating with pressurized steam and including a steam head (16), by injection of cold water under gravity from a reservoir (2) located at a higher level than the pressurized plant and connected there... | 08/26/1997 |
| 5610957 | Reactor core coolant flow rate control system for a BWR type nuclear power plant A reactor core coolant flow rate control system for a BWR type nuclear power plant in which electric power is generated by a turbine-driven generator driven by a steam turbine rotating under the work of a main steam generated from a cooling water recircul... | 03/11/1997 |
| 5398267 | Passive decay heat removal and internal depressurization system for nuclear reactors A jet condenser injects steam from a steam generator into a mixing tube, where it combines with coolant water from a heat exchanger. The steam completely condenses Upon mixing with the water because the ratio of the mass flow rate of water to that of stea... | 03/14/1995 |
| 5345484 | Feedwater nozzle and method of repair A nozzle includes a barrel being integral with a vessel and includes a first bore. A safe end is joined at one end to the barrel by a first weld and at an opposite end to an inlet pipe at a second weld. A first thermal sleeve is disposed inside the first ... | 09/06/1994 |
| 5262091 | Steam injector system A steam injector system comprises a plurality of steam injectors each being provided with with a check valve adapted for water supply, a check valve adapted for steam supply, a check valve adapted for overflow and a check valve adapted for discharge and t... | 11/16/1993 |
| 5135711 | BWR recirculation system A BWR coolant recirculation system includes a pump deck disposed in a downcomer and fixedly joined to a reactor pressure vessel and reactor core shroud. A plurality of circumferentially spaced reactor internal pumps (RIPs) are joined to the deck and opera... | 08/04/1992 |
| 5124115 | BWR series pump recirculation system A recirculation system is disclosed for driving reactor coolant water contained in an annular downcomer defined between a reactor vessel and a reactor core spaced radially inwardly therefrom. The system includes a plurality of circumferentially spaced pum... | 06/23/1992 |
| 5108695 | Ventilating system for an emergency feedwater enclosure in a nuclear power plant A ventilating system for an enclosure in a nuclear power plant is provided. The enclosure houses an emergency feedwater pump and its driver steam turbine. An eductor mounted in the enclosure is supplied with steam exhausting from the driver steam turbine.... | 04/28/1992 |
| 5082620 | BWR parallel flow recirculation system A recirculation system for a boiling water reactor includes a plurality of circumferentially spaced impeller-driven reactor internal pumps disposed in a downcomer for pumping a first portion of reactor coolant, and a plurality of circumferentially spaced ... | 01/21/1992 |
| 4905757 | Compact intermediate heat transport system for sodium cooled reactor An intermediate heat transport system is disclosed for providing steam generation from the secondary nonradioactive liquid sodium heat extraction loop from a sodium cooled nuclear reactor. The transport system includes a unitary module combining the steam... | 03/06/1990 |
| 4892463 | Rail mounted ejector The invention relates to an ejector to be placed in rooms which are inaccible to human beings. It comprises a casing with a diffuser bore, a head chamber, and a space for a working fluid including a lateral working fluid connection. The working fluid noz... | 01/09/1990 |
| 4879087 | Nuclear power plant Jet pumps and a feed water sparger are disposed in a reactor pressure vessel incorporating a core. A first feed water pipe supplies a portion of feed water to the jet pumps as their driving water. A second feed water pipe connected to the first feed water... | 11/07/1989 |
| 4844857 | Pressurized water reactors Pressurized water reactor with a primary circuit including therein a reactor pressure vessel, a steam generator and a main coolant pump, and with an auxiliary system having high pressure pumps for feeding water into the primary circuit, including a line e... | 07/04/1989 |
| 4699754 | Jet pump-drive system for heat removal The invention does away with the necessity of moving parts such as a check valve in a nuclear reactor cooling system. Instead, a jet pump, in combination with a TEMP, is employed to assure safe cooling of a nuclear reactor after shutdown. A main flow exis... | 10/13/1987 |
| 4687626 | Passive safety device for emergency steam dump and heat removal for steam generators in nuclear power reactors The present invention provides a passive safety device for dumping steam from the steam generator of a nuclear power reactor in case of emergencies. The device comprises a steam ejector immersed in a storage tank of coolant water, a conduit connecting the... | 08/18/1987 |
| 4526742 | Nuclear reactor plant A pressurized water nuclear reactor comprises a reactor vessel arranged in a pool made in the form of a pressure vessel, the pool being filled with a strongly neutron-absorbing liquid, for example borated water. The reactor vessel, in addition to being co... | 07/02/1985 |
| 4468172 | Jet pump plug A jet pump plug for a multi-nozzle jet pump is disclosed wherein the nozzles are accessible through a relatively small opening in the pump structure. The plug comprises a plurality of sections, each including a closure plate and a lever coupled thereto. E... | 08/28/1984 |
| 4444246 | Flash jet coolant circulation system The system removes heat from a vessel containing the source of heat, utilizing heat energy from water circulating through the vessel. The circulating water passes through a subcooler and into a convergent-divergent nozzle of a flash jet pump. Cooled water... | 04/24/1984 |
| 4440719 | Steam driven water injection The multistage injection of water into the pressure vessel of a nuclear reactor including the steam-driven injection of water using steam generated by the reactor, the stages of injection subject to the cooling of water heated by the steam, whereby the pr... | 04/03/1984 |
| 4347623 | Flash jet coolant pumping system The system removes heat from a vessel containing the source of heat, utilizing hot water heated by energy released in the vessel as the power supply. The hot water passes through a subcooler and a convergent-divergent nozzle of a flash jet pump where it i... | 08/31/1982 |
| 4285770 | Jet pump with labyrinth seal In a jet pump for a nuclear reactor a slip joint is provided between the mixer and diffuser sections thereof to facilitate jet pump maintenance and to allow thermal expansion. To limit leakage flow through the slip joint to a rate below that which causes ... | 08/25/1981 |
| 4212594 | Liquid feeding and mixing arrangement including an ejector thermal sleeve An improved arrangement for feeding a cool liquid into a pressure vessel and mixing the fed liquid with hot vessel-contained liquid includes an ejector thermal sleeve within an inlet nozzle. An upstream portion of the sleeve sealed to the nozzle surrounds... | 07/15/1980 |
| 4210614 | Passive containment system A containment system that provides complete protection entirely by passive means for the loss of coolant accident in a nuclear power plant and wherein all stored energy released in the coolant blowdown is contained and absorbed while the nuclear fuel is p... | 07/01/1980 |
| 4138318 | Nuclear reactor system of the fast type A nuclear reactor, preferably of the fast type, has a core surrounded by a breeding blanket which is composed of elements extending side by side with gaps therebetween so as to allow in certain conditions a leakage flow to adjust itself between the breedi... | 02/06/1979 |
