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| Number | Title | Issue Date |
| 7245689 | Nuclear reactor internal structure In a nuclear reactor internal structure, generation and promotion of object-downstream separating vortices are suppressed so that coolant uniformly flows in a reactor core and pressure loss of flow of the coolant is reduced so that the flow of the coolant is stabili... | 07/17/2007 |
| 6928133 | Pressurized light water reactor having flow converting grooves for emergency core cooling water A direct vessel injection-type pressurized light water reactor (DVI-PLWR), in which an emergency core cooling water (ECC) is directly injected into a downcomer of a reactor vessel, is disclosed. In order to reduce the ratio of ECC bypass from the downcomer to a brok... | 08/09/2005 |
| 6445758 | Internal structure of nuclear reactor with coolant flow stabilizing facility Within an upper plenum of a nuclear reactor, a portion of a heated coolant flows radially outward from a central portion of a core barrel (30) towards outlet nozzles (12) in a region of an upper core plate (21) extending outside of an outer periphery of t... | 09/03/2002 |
| 5940463 | In-vessel structure for fast reactors An in-vessel structure for a top-entry type fast reactor wherein a core is positioned in the interior of a reactor vessel, an upper core structure being provided above the core, a coolant passing through a cold leg piping inserted from an upper portion of... | 08/17/1999 |
| 5790619 | Drain system for a nuclear power plant A drain system for a shutdown cooling system of a pressurized water reactor type of a nuclear power plant (10) has an increased flow rate in the drain pipe (28) and drain pump (33). The hot leg (18) connected drain pipe has a vaned vortex breaker (30) mou... | 08/04/1998 |
| 5245639 | Core barrel flow hole plug and installation method therefor A plug assembly for plugging the flow hole of a core support barrel employs an offset arm for securing the plug to the core support barrel above the flow hole and the adjacent thermal shield. The disclosed embodiments do not require the cutting of an acce... | 09/14/1993 |
| 5198185 | Nuclear reactor flow control method and apparatus Method and apparatus for improving coolant flow in a nuclear reactor during accident as well as nominal conditions. The reactor has a plurality of fuel elements in sleeves and a plenum above the fuel and through which the sleeves penetrate. Holes are prov... | 03/30/1993 |
| 5120493 | Forced-circulation reactor with enhanced natural circulation A forced-circulation boiling-water reactor includes bypass check valves between a downcomer and a core inlet plenum. When the recirculation pumps are operating at full capacity, there is a maximum pressure differential from the downcomer to the core inlet... | 06/09/1992 |
| 5093075 | Upper internal nuclear reactor equipments including a flow separation device Upper internals for a pressurized nuclear reactor include an assembly for collecting the coolant leaving the core and a separating device. The device has guides for the control clusters and their drive shafts, a lower plate formed with passages for the co... | 03/03/1992 |
| 5075073 | Foreign object separator for a reactor cooling system A nuclear reactor includes a spaced sidewall and a core shroud defining a flow passage for channeling a coolant. A foreign object separator includes an arcuate endwall extending from the sidewall, with the core shroud including an intermediate portion spa... | 12/24/1991 |
| 4973444 | Nuclear reactor installations In a liquid metal cooled fast neutron nuclear reactor plant, surfaces (12) which are immersed in the flowing liquid metal and are vulnerable to liquid metal temperature fluctuations are provided with fins (20) defining cavities (22) for at least temporari... | 11/27/1990 |
| 4960561 | Nuclear reactor lower internals Lower internals for a reactor--typically a PWR--having a pressure vessel containing a core cooled by an upward flow of coolant and a core support include a shell defining a coolant volume between the support plate and the lower part of the vessel. The she... | 10/02/1990 |
| 4879089 | Liquid metal cooled nuclear reactors In a liquid metal cooled fast breeder nuclear reactor of the pool type, the hot and cold pools (13, 19) are separated by an intermediate plenum (24) which, under steady state conditions, encloses a volume of substantially stagnant liquid metal to form a t... | 11/07/1989 |
| 4849162 | Modular radial neutron reflector Modular neutron reflector assemblies removably insertable into the irregular space in a nuclear reactor between a generally cylindrical array of square fuel assemblies comprising the core and the cylindrical core barrel surrounding the core, include an el... | 07/18/1989 |
| 4842813 | Nuclear reactor having a longitudinally elongated vessel Nuclear reactor having upper internal equipments and lower internal equipments with probe guiding means including probe guide ducts for slidably guiding flexible elongated probes into the core. The upper internal equipments include a plenum chamber for co... | 06/27/1989 |
| 4834937 | Fluid flow-restricting seals or baffles A baffle (12) is provided for the gaps between a pair of surfaces (10, 14). The baffle has a lantern configuration and comprises a number of spring steel foils (15) arranged in side-by-side relation with overlap between adjacent foils. Each foil (15) is o... | 05/30/1989 |
| 4793966 | Nuclear reactor A nuclear reactor in which rupture by fatigue of the components of the control-rod assemblies is precluded. The fatigue is caused by the vibration of the components or cavitation under the action of the coolant flowing at a high velocity transversely to t... | 12/27/1988 |
| 4788032 | Nuclear reactor with flow guidance in the upper internals A nuclear reactor has a pressure resistant vertical vessel with inlet and outlet pipes situated at the same horizontal level. It also includes internals having a barrel supporting the core and defining with the vessel a down flow path for the coolant from... | 11/29/1988 |
| 4788033 | Calandria A calandria for use in conducting the hot coolant of a nuclear reactor transversely. The calandria includes an upper plate and a lower plate which support tubes. The plates and tubes are enclosed in a shell which extends above the upper plate and has a su... | 11/29/1988 |
| 4786464 | Cover plug of the core of a fast neutron nuclear reactor The cover plug (4) comprises a cylindrical barrel (8), a support plate (10), a group of vertical tubes (12) for the control rods and for the instrumentation of the core, an apertured transverse plate (28) fixed to the lower end of the barrel (8) and a tra... | 11/22/1988 |
| 4786465 | Method for converting a downward flow of bypass coolant to an upward flow A method for converting a vertically downward flow of bypass coolant through coolant flow holes in a core barrel and former plates in a nuclear reactor to a vertically upward flow. Coolant flow holes are provided in the normally solid top former plate by ... | 11/22/1988 |
| 4786461 | Reactor internals hold down spring Disclosed is a reactor internals hold down spring and upper head region cooling passage. The hold down spring utilizes a plurality of stacks of Belleville spring washers to provide spring load and deflection capability to hold down the reactor vessel inte... | 11/22/1988 |
| 4784825 | Method and apparatus for preventing and repairing vibrational damage to nuclear fuel rods The fuel rods located in areas of a nuclear reactor core where water jetting damage to the rods can occur are secured together by a clip, in order to change the mass subject to fretting damage. The change of mass changes the amplitude of the induced fuel ... | 11/15/1988 |
| 4770840 | Spectral shift light water nuclear reactor For operating a PWR with spectral shift during all combustion cycles and with undermoderation during some cycles only, the reactor structure is designed for receiving either one of two types of fuel assemblies, having the same geometry. All fuel assemblie... | 09/13/1988 |
| 4759904 | Pressurized water reactor having improved calandria assembly A calandria assembly is received within the pressure vessel of a nuclear reactor system, at an elevation corresponding to the level of the outlet nozzles of the vessel, and receives pressurized coolant traveling in an axial flow direction within the vesse... | 07/26/1988 |
| 4759898 | Fast neutron nuclear reactor having an improved core cover plug In a liquid metal-cooled fast neutron nuclear reactor which has a vessel sealed by a horizontal slab on which is suspended a core cover plug, the lower part of said plug comprises a deflecting grid, optionally duplicated by a thermal protection grid. Each... | 07/26/1988 |
| 4752441 | Modular former for inner barrel assembly of pressurized water reactor An array of plural rod guides each housing therewithin corresponding pluralities of rods, as disposed in parallel axial relationship within the cylindrical sidewall of the inner barrel assembly of a pressurized water reactor, defines a plurality of periph... | 06/21/1988 |
| 4734250 | Concentric pipe loop arrangement for pressurized water nuclear reactors A pipe loop arrangement for the closed primary system of a nuclear reactor. The heated reactor coolant flows through a horizontally positioned hot leg pipe while the return flow cooled reactor coolant flows through a cold leg pipe concentrically mounted w... | 03/29/1988 |
| 4731220 | Neutron reflector Metallic reflector units supported solely by the core barrel substantially fill the annular spaces between the vertically spaced former plates which traverse the irregular space between the fuel assembly array and the core barrel in a pressurized water re... | 03/15/1988 |
| 4717527 | Fuel assembly A fuel assembly for a pressurized water nuclear reactor incorporating fluid moderator spectral shift control means. During the first part of the fuel cycle when there is excess reactivity, neutron moderation may be decreased by replacing a portion of the ... | 01/05/1988 |
| 4716012 | Reactor internals loose parts strainer An upwardly convex resilient annular strainer, fixed to the secondary core support base plate in a PWR, bends to remain in contact with the lower hemispherical head section of the pressure vessel as the gap between the internals and the lower hemispherica... | 12/29/1987 |
| 4716013 | Nuclear reactor Failure of the control-rod assemblies, particularly the control-rod guides and the WDRC's, by transverse flow of coolant through these members is prevented by directing the flow through a calandria above the guides. To avoid a high pressure drop in the co... | 12/29/1987 |
| 4711760 | Nuclear reactor incorporating locking device for threaded bolt connections An improved nuclear reactor wherein the bolted connections between the baffle plates and baffle former and the baffle former and the core barrel are provided with a noval locking device that prevents loosening of the bolted connections. The locking device... | 12/08/1987 |
| 4707331 | Top end support for water displacement rod guides of pressurized water reactor A top end support for rod guides disposed in closely spaced, parallel axial relationship within an inner barrel assembly of a pressurized water reactor vessel includes, in telescoping relationship, a generally cylindrical support having an end closure wit... | 11/17/1987 |
| 4701299 | Modular lining for adapting the containment to the core of a pressurized water nuclear reactor A modular lining for adapting the containment to the core of a pressurized water nuclear reactor, consisting of juxtaposed modular blocks (5) placed between the core containment (1) and the outer surface of the core (3). Arranged between the adjacent face... | 10/20/1987 |
| 4683108 | Locking screw apparatus and method for underwater remote replacement An apparatus and method for under water remote replacement of the screws which secure together first and second structures in the internal region of a nuclear reactor core, wherein the screws are received and counterbored screw bores in the first structur... | 07/28/1987 |
| 4681728 | Nuclear reactor A nuclear reactor including, in the upper internals, a guide structure capable of effectively accommodating and guiding without binding the large number of neutron-absorber rods included in modern reactors of improved efficiency. The neutron-absorber rods... | 07/21/1987 |
| 4664879 | Guide tube flow restrictor A guide tube flow restrictor for use on an upper guide tube housing support plate of a nuclear reactor, for guiding of a control rod drive shaft through an aperture in the support plate and restriction of flow of coolant therethrough, has an outer ring se... | 05/12/1987 |
| 4661306 | Fluid moderator control system reactor internals distribution system Apparatus is disclosed for introducing a low neutron moderating fluid into the reactor vessel of a spectral shift pressurized water nuclear reactor and for distributing the moderating fluid through the lower core support plate into the fuel assemblies in ... | 04/28/1987 |
| 4659539 | Nuclear reactor To preclude failure of components of control-rod assemblies or of unprotected control rods (WDRC's) a calandria is provided above the upper internals. The calandria includes hollow tubes through which the drive rods for the various control rods pass and w... | 04/21/1987 |
