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| Number | Title | Issue Date |
| 7751522 | Covering element for a reactor core of a nuclear installation, and nuclear reactor A covering element for a reactor core of a nuclear installation provides a secure and tight closure of the reactor core in an operating state and at the same time being simple and cost effective to produce. The covering element is easily disassemblable during mainte... | 07/06/2010 |
| 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 |
| 7342989 | Apparatuses and methods for mechanical shielding and cooling A transport or storage cask comprises a cask body, a modular thermal conducting and shielding system and a mechanical attachment. The modular thermal conducting and shielding system includes a modular fin and a modular neutron shield. The mechanical attachment retai... | 03/11/2008 |
| 7159737 | Internally cooled pressure containment apparatus A pressure containment apparatus includes a shell having a top end and a bottom end forming a pressure chamber. The pressure containment apparatus also includes a liner having an outside diameter larger than an inside diameter of the shell, wherein the liner is remo... | 01/09/2007 |
| 7145976 | Procedure and means for replacing and procedure for repairing a section of a pipe in the primary circuit of a nuclear reactor In a nuclear reactor, cooled by pressurized water, an apparatus is employed for replacing a section of a primary circuit primary pipe that interconnects first and second components of a primary circuit. The apparatus cuts out and removes a section of the primary pip... | 12/05/2006 |
| 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 |
| 7120219 | Reactor pressure vessel A reactor pressure vessel supports the flanges of a core barrel assembly and an upper support plate. These flanges have aligned holes for diverting inlet coolant water to the vessel head for cooling the head. The aligned holes have different cross-sectional areas fo... | 10/10/2006 |
| 7076017 | Apparatus and method for repairing reactor vessel cladding using a seal plate A seal plate for repairing damaged areas in a pressure vessel cladding includes a first side and an opposing second side and a sealing portion located on the second side, with the sealing portion circumscribing the seal plate. The seal plate also includes a seal lip... | 07/11/2006 |
| 6939521 | Fluoropolymer reactor with heat exchange jacket A reactor for fluorinating an organic compound comprising (a) an outer vessel; (b) a reactor vessel being disposed within said outer vessel to define an annular space, said reactor vessel at least partially comprising a fluoropolymer, said annular space being adapte... | 09/06/2005 |
| 6888909 | Reactor pressure vessel A reactor pressure vessel supports the flanges of a core barrel assembly and an upper support plate. These flanges have aligned holes for diverting inlet coolant water to the vessel head for cooling the head. The aligned holes have different cross-sectional areas fo... | 05/03/2005 |
| 6888908 | Reactor head with integral nozzles A reactor closure head assembly has guide tube nozzles which are integral with the reactor closure head. A dome-shaped forging having a concave surface is prepared with extra thickness equal to or greater than the desired nozzle height. Nozzles having bores therethr... | 05/03/2005 |
| 6885720 | Modular reactor containment system A compact metal containment vessel, for a boiling water nuclear reactor, includes in one exemplary embodiment, a bottom head, a removable top head, and a substantially cylindrical sidewall extending from the bottom head to the top head. The bottom head, top head and... | 04/26/2005 |
| 6810099 | Boiling water reactor nuclear power plant and its construction method The present invention provides a boiling water reactor nuclear power plant in which a reactor core support plate, upper grid plate, and a reactor core consisting of fuel assemblies supported by these plates are provided in the inner base portion of a nuclear reactor... | 10/26/2004 |
| 6795518 | Integral PWR with diverse emergency cooling and method of operating same Passive emergency cooling in response to a loss of coolant accident (LOCA) in a PWR, having an integral reactor pressure vessel incorporating the steam generators and housed in a small high pressure containment vessel, is provided by circulating cooling water throug... | 09/21/2004 |
| 6757351 | Modified large natural circulation reactor The present invention, in one form, is a natural circulation reactor having, in one embodiment, a layer of high aluminate cement concrete disposed between an uninsulated steel liner and a prestressed concrete reactor vessel. The prestressed concrete reactor vessel i... | 06/29/2004 |
| 6678345 | Reactor pressure vessel and process for temperature equalization in a reactor pressure vessel A reactor pressure vessel with an upper support plate, in which an equalization opening is provided as a bypass is described. A process for temperature equalization between an upper dome chamber above a support plate and a lower chamber below it is descri... | 01/13/2004 |
| 6519308 | Corrosion mitigation system for liquid metal nuclear reactors with passive decay heat removal systems A liquid metal nuclear reactor is described. The reactor includes a concrete reactor silo, and at least one primary vessel located in the reactor silo and coupled to a reactor shield deck. Each primary vessel is substantially surrounded by a containment v... | 02/11/2003 |
| 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 |
| 6426986 | Forged nozzle shell course for a pressure vessel A forged nozzle shell course for a pressure vessel includes shell course comprising at least one reinforcement portion extending radially outward from an outer surface of the shell course with each reinforcing portion including a nozzle having a radius. T... | 07/30/2002 |
| 6389094 | Integral forged shroud flange for a boiling water reactor A forged upper shroud section which may be machined from a single piece rectangular cross-section ring forging and includes a circular flange and a cylindrical shell is described. Openings and slots are machined into the flange to align and support the sh... | 05/14/2002 |
| 6233300 | Conical shaped seismic guide pins and mating openings A top guide to shroud head interface is described. In one embodiment, the interface includes a top guide that includes a flange that is configured to engage a corresponding flange of the shroud head. The top guide flange includes a plurality of frusto-con... | 05/15/2001 |
| 6188741 | Machined stub tube in a bottom head of a boiling water reactor An integral stub tube which simplifies the reactor pressure vessel fabrication process, provides a structural transition between the penetration and head, and facilitates future remote inspection of the attachment weld is described. In one embodiment, a s... | 02/13/2001 |
| 6061415 | Missile shield for a nuclear reactor pressure vessel An integrated head assembly for a nuclear reactor pressure vessel includes a closure head with CRDM assemblies extending upwardly from the head. A CRDM seismic support disposed above the closure head provides lateral support for the CRDM assemblies. The s... | 05/09/2000 |
| 5979222 | Pressure vessel adaptor for testing of undersea fiber optic systems A pressure testing apparatus can pressure test separately a first object having a width and a height and a second object having a width and a height. The first object can be, for example, a fiber optic repeater; the second object can be, for example, a fi... | 11/09/1999 |
| 5791107 | Building with a sealing element The invention pertains to a building, particularly in the context of a nuclear installation. The building is formed with an outer shell and an inner shell which form an intermediate space therebetween. A sealing element is disposed in the intermediate spa... | 08/11/1998 |
| 5721758 | Bottom head to shell junction assembly for a boiling water nuclear reactor A bottom head to shell junction assembly which, in one embodiment, includes an annular forging having an integrally formed pump deck and shroud support is described. In the one embodiment, the annular forging also includes a top, cylindrical shaped end co... | 02/24/1998 |
| 5706319 | Reactor vessel seal and method for temporarily sealing a reactor pressure vessel from the refueling canal A reactor vessel seal for temporarily sealing a reactor pressure vessel from a water-filled refueling canal above the reactor pressure vessel. The reactor vessel seal is installed in place of the removable reactor pressure vessel closure head for inspecti... | 01/06/1998 |
| 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 |
| 5563927 | Method of retarding irradiated nuclear vessel crack initiation and extensions An irradiated steel pressurized nuclear reactor pressure vessel 10 is provided with a crack initiation retarding and crack extension retarding reactor vessel integrity girdle 20 or 120 made up of shoes or links 22, with mechanical take up joints (26 to 34... | 10/08/1996 |
| 5544210 | Pressure vessel apparatus for containing fluid under high temperature and pressure A pressure vessel apparatus for containing fluid under high pressure and temperature including pressure surges caused by in-vessel explosions includes a vessel main body, a vessel top body and a vessel head. Elongated tendons interconnect the vessel main ... | 08/06/1996 |
| 5465280 | Pressure vessel apparatus Pressure vessel apparatus includes upper and lower pressure vessel housings maintained together under pressure by tendons. Bellows are connected to the pressure vessel housings in order to provide leaktight barriers, and to permit motion of the pressure v... | 11/07/1995 |
| 5442667 | Reactor pressure vessel with limited failure zones A reactor pressure vessel for a nuclear reactor includes an upper part and a lower part. At least the lower part has first subregions with a lesser wall thickness and second subregions with a greater wall thickness. The lesser wall thickness is selected f... | 08/15/1995 |
| 5359632 | Reactor vessel cavity seal plate A nuclear reactor vessel cavity seal plate. An annular support plate is positioned over the cavity between the reactor vessel and the shield structure and seal welded to the shield structure. Inner and outer support rings attached to the annular plate are... | 10/25/1994 |
| 5353320 | Reactor pressure vessel nozzle A nozzle for joining a pool of water to a nuclear reactor pressure vessel includes a tubular body having a proximal end joinable to the pressure vessel and a distal end joinable in flow communication with the pool. The body includes a flow passage thereth... | 10/04/1994 |
| 5278876 | Reactor pressure vessel vented head A head for closing a nuclear reactor pressure vessel shell includes an arcuate dome having an integral head flange which includes a mating surface for sealingly mating with the shell upon assembly therewith. The head flange includes an internal passage ex... | 01/11/1994 |
| 5230860 | Reactor vessel cavity seal plate A nuclear reactor vessel cavity seal plate. An annular support plate is positioned over the cavity between the reactor vessel and the shield structure. The inner diameter of the support plate rests freely upon the reactor vessel flange to allow movement o... | 07/27/1993 |
| 5229067 | Liquid metal cooled nuclear reactor A liquid metal cooled nuclear reactor for a nuclear power plant on the modular principle is disposed in a reactor cavern having cooling surfaces. A reactor tank contains a reactor core and one or more heat exchangers and primary pumps and is surrounded by... | 07/20/1993 |
| 5217681 | Special enclosure for a pressure vessel A prestressed pressure vessel safety enclosure is used as a pressure safety enclosure for a nuclear reactor pressure vessel or other primary system vessel containing fluid or gaseous material under high pressure, such as, steam generators, pressurizers an... | 06/08/1993 |
| 5211906 | Reactor containment vessel A pressure control chamber of a reactor containment vessel for receiving the atmosphere of the reactor containment vessel containing leakage steam developing in the event of an accident includes a pressure control pool, and a wet well disposed above the p... | 05/18/1993 |
| 5207977 | Reactor pressure vessel with forged nozzles Inlet nozzles for a gravity-driven cooling system (GDCS) are forged with a cylindrical reactor pressure vessel (RPV) section to which a support skirt for the RPV is attached. The forging provides enhanced RPV integrity around the nozzle and substantial re... | 05/04/1993 |
