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| Number | Title | Issue Date |
| 7835483 | Steam separator, boiling water reactor and swirler assembly A steam separator comprises an outer main swirler and an inner auxiliary swirler which is smaller than the main swirler. The swirlers are provided so as to be concentric on the inner wall at the lower side of the first stage inner cylinder. In the steam separator, w... | 11/16/2010 |
| 7352838 | Reactor pressure vessel of a boiling water reactor and method for water vapor separation in a reactor pressure vessel of a boiling water reactor A pressure vessel of a reactor has a flow space between the reactor core and a separation device for separating water from water steam. The cross-section area of the flow section of the space expands upstream of the separation device. This makes it possible to pre-s... | 04/01/2008 |
| 7349518 | Boiling water reactor core and fuel assemblies therefor A ratio of the number of fuel assemblies loaded on a core to the number of control rod drive mechanisms is 3 or more. The fuel assembly itself contains mixed oxides of a low enrichment concentration uranium oxide containing 3 to 8 wt % in the average enrichment conc... | 03/25/2008 |
| 7215729 | Fuel assembly and nuclear reactor A resistance member (e.g., fuel holding portion of the lower tie plate) is provided at the lower end of the fuel assembly. Provision is made of a coolant ascending path in which said water rods have coolant inlet ports that are open in a region lower than the resist... | 05/08/2007 |
| 7191108 | Structured approach for risk-informing deterministic safety analyses A risk-informed method for safety analyses of nuclear power generating systems is provided. In an exemplary embodiment, the method includes ordering events by an initiating event frequency, defining an initiating event frequency threshold value, defining acceptance ... | 03/13/2007 |
| 7139360 | Use of boron or enriched boron 10 in UO The present invention provides a nuclear fuel assembly, where a boron-containing compound is used as a burnable poison and is distributed in a majority of the rods in the assembly. The assembly comprises a plurality of fuel rods, each fuel rod containing a plurality... | 11/21/2006 |
| 6980621 | Main steam system around nuclear reactor A main steam system around a nuclear reactor which comprises two main steam nozzles in a reactor pressure vessel, each of the main nozzles being disposed at a symmetrical position with respect to a plane parallel to steam outlet faces of steam dryers provided inside... | 12/27/2005 |
| 6781331 | Method and apparatus for regulating motor generator output A method and system of regulating an output voltage of a boiling water reactor nuclear reactor plant recirculation system motor generator are provided. The method includes sensing an alternator output voltage and transmitting an alternator output voltage signal to a... | 08/24/2004 |
| 6526115 | Supercritical-pressure water cooled reactor and power generation plant A supercritical pressure water cooled reactor comprising: a reactor vessel including: a shell part for containing sub-critical pressure coolant, and an end part for containing supercritical-pressure coolant which is separated from the sub-critical pressur... | 02/25/2003 |
| 6470062 | Nuclear fuel assembly A fuel assembly for a boiling water reactor which is designed to allow water, during operation of the reactor, to flow upwards through the fuel assembly while absorbing heat from a plurality of fuel rods, whereby part of the water is transformed into stea... | 10/22/2002 |
| 6343106 | Boiling water reactor and operation thereof In a nuclear reactor, in-core stability is improved, power density is increased, and an economical natural-circulation reactor (or partial forced-circulation reactor) is achieved. The reactor core has a void reactivity coefficient between -0.07 and -0.03%... | 01/29/2002 |
| 6337892 | Boiling water reactor core, boiling water reactor, and method of operating boiling water reactor In each of a number of fuel assemblies loaded in a core of a boiling water reactor, a fuel holding portion of a lower tie plate holds lower end portions a plurality of fuel rods and at least one water rod. The water rod includes a rising pipe opened to a ... | 01/08/2002 |
| 6091791 | Shroud attachment for a boiling water reactor A shroud attachment assembly which provides both structural support for the shroud and a seal between the shroud and shroud support is described. In one specific embodiment, the shroud attachment assembly includes a shroud flange formed integral with the ... | 07/18/2000 |
| 6035011 | Reactor core A reactor core for a boiling water nuclear reactor includes a plurality of fuel assemblies (40) with a plurality of vertical fuel rods (10) and possibly occasional vertical water-filled rods or channels (32, 48, 49, 50, 51) which are surrounded by a fuel ... | 03/07/2000 |
| 5844957 | Reactor core A reactor core for a boiling water nuclear reactor includes a plurality of fuel assemblies (40) with a plurality of vertical fuel rods (10) and possibly occasional vertical water-filled rods or channels (32, 48, 49, 50, 51) which are surrounded by a fuel ... | 12/01/1998 |
| 5659590 | Removable shroud and pump deck for a boiling water nuclear reactor In a pressure vessel of a nuclear reactor containing a core assembly enclosed within a core shroud, the core shroud spaced radially inwardly of a side wall of the pressure vessel with an annular pump deck located in an annular radial space between the cor... | 08/19/1997 |
| 5528641 | Fuel assembly A fuel assembly is provided with a coolant ascending path for making coolant rise and a water rod having a coolant descending path for conducting the coolant. A ratio of a flow area in a coolant inlet port of the smallest in coolant ascending path 13 on t... | 06/18/1996 |
| 5519744 | Removable shroud and pump deck for a boiling water nuclear reactor In a pressure vessel of a nuclear reactor containing a core assembly enclosed within a core shroud, the core shroud spaced radially inwardly of a side wall of the pressure vessel with an annular pump deck located in an annular radial space between the cor... | 05/21/1996 |
| 5426675 | Self-aligning seal system for maintenance service in nuclear reactor pressure vessels A self-aligning seal system for use in carrying out maintenance services in a nuclear fission reactor plant is disclosed. The self-aligning seal system enables an operator to block off openings in the lower portion of a water filled reactor pressure vesse... | 06/20/1995 |
| 5406597 | Boiling water reactor including split control rod drives A boiling water reactor includes a pressure vessel containing a reactor core, chimney, steam separator assembly, and steam dryer assembly therein, with the vessel being filled with reactor water to a normal water level through the steam separator assembly... | 04/11/1995 |
| 5392326 | Boiling water reactor A boiling water reactor comprises a reactor pressure vessel accommodated in a vertical fashion, a core disposed at a low portion in the reactor pressure vessel, a plurality of control rods to be inserted from an upper side of the core into the spaces betw... | 02/21/1995 |
| 5359634 | Reactor core for a boiling water nuclear reactor A reactor core for a boiling water nuclear reactor comprises a plurality of vertical fuel assemblies (40), each one containing a plurality of fuel rods (10, 10a, 10b) with enriched nuclear fuel material, which are arranged between a bottom tie plate (11) ... | 10/25/1994 |
| 5319689 | Compactable phase-separator assembly for dual-phase nuclear reactor A phase-separator assembly for a boiling-water nuclear reactor includes a steam-separator and a dryer. The steam separator and dryer are mechanically coupled so that relative vertical movement is permitted therebetween. The mechanical coupling limits this... | 06/07/1994 |
| 5295171 | Combined jet pump and internal pump rercirculation system A recirculation system for driving reactor coolant water in a downcomer within a reactor pressure vessel includes a jet pump disposed in the downcomer and having a suction inlet at the top thereof and an outlet at the bottom thereof. A reactor internal pu... | 03/15/1994 |
| 5267286 | Fuel assembly and reactor core A fuel assembly having a water cross or water rod arranged between the fuel rods, an inside of the water cross or water rod being divided into a coolant rising passage and a coolant lowering passage, and a control guide tube disposed inside the water cros... | 11/30/1993 |
| 5213755 | Low pressure coolant injection modification for boiling water reactors A conventional low pressure coolant injection system for boiling water reactors is provided. With the modification, the cross tie conduits and associated valves remain open between two LPCI divisions. On the occasion of an LOCA, the LPCI pumps are activat... | 05/25/1993 |
| 5213756 | Boiling water reactor with expanded core diameter An expanded reactor core capacity is achieved within the constraints imposed by the diametric extent of the current advanced boiling reactor (ABWR). This enhanced core capacity is achieved through the utilization of a scalloped shroud structure in conjunc... | 05/25/1993 |
| 5204053 | Bi-level fuel management method for boiling-water nuclear reactor Fuel management in a boiling-water nuclear reactor involves arranging fuel bundles in upper and lower matrices of the reactor core. During a refueling operation, some bundles in the upper matrix are removed and retired, while fresh bundles are inserted in... | 04/20/1993 |
| 5180547 | Boiling water reactor with staggered chimney A natural circulation boiling water reactor system comprises a reactor vessel enclosing a reactor core, for generating steam to drive a turbine which can drive a generator to generate electricity. The vessel includes a chimney for guiding the recirculatin... | 01/19/1993 |
| 5171522 | Fuel design for high power density forced circulation boiling water reactor A fuel bundle of square cross section and standard vertical dimension is disclosed. The fuel bundle includes a matrix of upstanding vertical rods, a lower tie plate for supporting the matrix of vertical rods and permitting the inflow of liquid moderator c... | 12/15/1992 |
| 5164155 | Fuel bundle with short and intermediate part length rods minimized for flow induced vibration risk and rod bow A fuel bundle having spacers optimally deployed is disclosed wherein the distance between the spacers varies along the length of the fuel bundle. The fuel bundle has a dense fuel rod array (preferably in the range of 10×10). It includes at least one part... | 11/17/1992 |
| 5162097 | Steam cooled nuclear reactor with bi-level core In accordance with the present invention, a nuclear reactor with a recirculating heat transfer fluid has a bi-level core which provides enhanced flexibility in fuel arrangement. The bi-level core includes two sets of fuel units, one set arranged on a firs... | 11/10/1992 |
| 5154880 | Nuclear fuel bundle with coolant bypass channel A fuel bundle for a natural-circulation boiling-water reactor includes at least one coolant bypass tube which is at least partially open at both its top and bottom and extends about 2/3 of the bundle height. Water within the bypass tube remains liquid. As... | 10/13/1992 |
| 5112570 | Two-phase pressure drop reduction BWR assembly design In a boiling water reactor having discrete bundles of fuel rods confined within channel enclosed fuel assemblies, an improved fuel design of bundles of fuel rods interior of the channels is disclosed. Specifically, partial length rods are utilized which e... | 05/12/1992 |
| 5106573 | BWR Natural steam separator A steam separator for a boiling water reactor includes a pressure vessel and a chimney spaced radiallly inwardly therefrom to define a downcomer therebetween for recirculating water, the chimney being disposed above a reactor core for channeling upwardly ... | 04/21/1992 |
| 5063020 | Steam-water separating construction for boiling water nuclear reactors A boiling water nuclear fission reactor is disclosed with a unique steam-water separating system. The steam-water separation means comprises an assemblage of open troughs positioned above the fuel core which reduces the amount of steam recycled through th... | 11/05/1991 |
| 5023047 | Nuclear reactor having an ascending cooling path much greater than the descending cooling path A fuel assembly has a water rod which consists of a coolant ascending path and a coolant descending path, the coolant ascending path opening below a fuel support of a lower tie plate, the coolant descending path opening above the fuel support and adapted ... | 06/11/1991 |
| 5019328 | Natural circulation type boiling light-water reactor A natural circulation type boiling light-water reactor comprises a pressure vessel, a reactor core disposed within said pressure vessel to heat light water so as to generate main steam, a steam outlet provided in a wall of said pressure vessel for drawing... | 05/28/1991 |
| 5017332 | Two-phase pressure drop reduction BWR assembly design In a boiling water reactor having discrete bundles of fuel rods confined within channel enclosed fuel assemblies, an improved fuel design of bundles of fuel rods interior of the channels is disclosed. Specifically, partial length rods are utilized which e... | 05/21/1991 |
| 5009838 | Internal pump for nuclear reactor A nuclear reactor internal pump has a pump shaft connected to a motor and rotatably passing through the bottom of a nuclear reactor pressure vessel, an impeller fitted to a front end portion of the pump shaft, a diffuser disposed on the downstream side of... | 04/23/1991 |
