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| Number | Title | Issue Date |
| 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 |
| 7257185 | Fuel assembly and thimble screw of the same A fuel assembly includes a bottom nozzle set on a lower core plate of a nuclear reactor, a top nozzle with a hold down spring to urge the bottom nozzle against the lower core plate, guide thimbles which guide control rods, having passed through the top nozzle, towar... | 08/14/2007 |
| 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 |
| 6934350 | Core configuration for a nuclear reactor In an embodiment of the present invention, the core of a nuclear reactor includes a plurality of fuel cells and a plurality of large control rods. Each large control rod is about two times the width of a conventional control rod and includes four control rod blades ... | 08/23/2005 |
| 6934351 | Boiling water reactor fuel assembly An fuel assembly with a connection between a fuel channel and a lower tie plate to allow the fuel channel to be removed from an internal fuel rod assembly without the necessity of moving interior fuel rods during removal of the fuel channel. ... | 08/23/2005 |
| 6912264 | Fuel assembly A fuel element for a nuclear reactor has fuel rods with nuclear fuel guided through spacers. The spacers are equipped with devices that exert a swirling impulse upon a coolant flowing along the fuel rods. In order to present as little flow resistance as possible for... | 06/28/2005 |
| 6888911 | Method for preventing fretting damage to fuel rods, nuclear reactor fuel element, device for preventing fretting damage, and spacer in a fuel assembly of a nuclear reactor Transverse vibrations of the pellet columns included in the fuel rods of fuel elements are limited by elastically mounting the fuel rod jacket tubes in the mesh of spacer grids. When the fuel rods are supported in this way, flexural vibrations of a higher order occu... | 05/03/2005 |
| 6885722 | Fuel assembly A fuel assembly attains high burnup and increases reactor shut-down margin when loaded into a reactor core wherein a water gap width on a control rod side and a water gap width on a side opposite to the control rod side are almost equal to each other. The fuel assem... | 04/26/2005 |
| 6765979 | Fluid separation device for vent volumes of nuclear fuel bundles Separation devices are disposed in the vent volume above part-length rods and above one or more of the spacers above the upper ends of the part-length rods. The separation devices preferably comprise swirlers located above the lattice openings which would otherwise ... | 07/20/2004 |
| 6735268 | Fuel spacer/water rod capture apparatus and methods for boiling water nuclear reactors The spacer/water rod retention assembly includes a clip secured to the spacer having a slot perimetrically bounded both axially and laterally spaced portions of the clip. A resilient tab projects from one side portion into the slot. A water rod has a projecting tab ... | 05/11/2004 |
| 6735267 | Fuel assembly A fuel assembly in accordance with the present invention comprises a plurality of first fuel rods and a plurality of second fuel rods having a length shorter than a length of the first fuel rod, and these two kinds of fuel rods are arranged in a fuel rod array of 10... | 05/11/2004 |
| 6643350 | Fuel assembly A fuel assembly attains high burnup and increases reactor shut-down margin when loaded into a reactor core wherein a water gap width on a control rod side and a water gap width on a side opposite to the control rod side are almost equal to each other. The... | 11/04/2003 |
| 6600800 | Fuel element for a boiling water nuclear reactor In a boiling water fuel assembly, some of the fuel rods are shortened. It is necessary to establish a sufficiently high maximum power for transition to boiling. To optimize this power, spacers are at a constant distance at a bottom and are at a shorter di... | 07/29/2003 |
| 6598029 | Bidding for energy supply with request for service An auction service is provided that stimulates competition between energy suppliers (i.e., electric power or natural gas). A bidding moderator (Moderator) receives bids from the competing suppliers of the rate each is willing to charge to particular end u... | 07/22/2003 |
| 6516043 | Fuel assembly and reactor core and fuel spacer and channel box A fuel assembly includes a plurality of fuel rods placed in a square lattice array of 9-rows/9-columns and at least one water rod. In this fuel assembly, the fuel rod pitch of the plurality of fuel rods is in a range of 14.15 mm to 14.65 mm, and means for... | 02/04/2003 |
| 6516042 | Nuclear fuel assembly The invention relates to a fuel assembly for a boiling water reactor which is adapted, during operation of the reactor, to allow water to flow upwards through the fuel assembly while absorbing heat from a plurality of fuel rods, whereby part of the water ... | 02/04/2003 |
| 6510192 | Boiling water type nuclear reactor core and operation method thereof A boiling water type nuclear reactor core, in which a plurality of fuel assemblies, each enclosed in a channel box, are loaded and a plurality of control rods, each having control blades, are arranged between the channel boxes. Long blade control rods, ea... | 01/21/2003 |
| 6487266 | Siphon water rods A fuel bundle assembly for a boiling water nuclear reactor comprising a plurality of fuel rods having respective fuel columns therein, and arranged in an ordered array, extending between upper and lower support structures, the plurality of fuel rods enclo... | 11/26/2002 |
| 6434210 | Fuel assembly A fuel assembly attains high burnup and increases reactor shut-down margin when loaded into a reactor core wherein a water gap width on a control rod side and a water gap width on a side opposite to the control rod side are almost equal to each other. The... | 08/13/2002 |
| 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 |
| 6333957 | Tool kit for fabricating, inspecting and handling a nuclear fuel bundle A tool kit for adjusting the angular orientation of water rods about respective axes in a nuclear fuel bundle includes a washer wrench, socket, orientator wrenches, orientator gauges and an orientator cap. The washer wrench has opposed jaws having paralle... | 12/25/2001 |
| 6301321 | Compound water channel system for boiling water reactor fuel assemblies A new design concept of boiling water reactor fuel assembly water channels is disclosed. The new design utilizes parallel flow paths guided inside an outer conduit without reversing flow. The different flow paths discharge water into the coolant stream, w... | 10/09/2001 |
| 6285729 | Fuel spacer/water rod capture apparatus and methods for boiling water nuclear reactors The spacer/water rod retention assembly includes a clip secured to the spacer having a slot perimetrically bounded both axially and laterally spaced portions of the clip. A resilient tab projects from one side portion into the slot. A water rod has a proj... | 09/04/2001 |
| 6278757 | 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... | 08/21/2001 |
| 6236701 | Fuel assembly for a nuclear reactor A fuel assembly for a boiling water reactor comprising at least one rotary cell (13a-13d) which has fuel rods (4) arranged in a number of concentric rings with a substantially circular shape, and a steam conducting channel (17a-17d) arranged in the centre... | 05/22/2001 |
| 6226343 | Water rod in a fuel assembly of a boiling water nuclear reactor A water rod for a fuel assembly of a boiling water nuclear reactor has a first end and a second end, wherein at least one of the first and second ends is directly attachable to a tie plate of the fuel assembly without an end plug. The structure of the pre... | 05/01/2001 |
| 6205196 | Boiling water type nuclear reactor core and operation method thereof A boiling water type nuclear reactor core, in which a plurality of fuel assemblies, each enclosed in a channel box, are loaded and a plurality of control rods, each having control blades, are arranged between the channel boxes. Latitudinal long blade cont... | 03/20/2001 |
| 6181763 | Siphon water rods A fuel bundle assembly for a boiling water nuclear reactor comprising a plurality of fuel rods having respective fuel columns therein, and arranged in an ordered array, extending between upper and lower support structures, the plurality of fuel rods enclo... | 01/30/2001 |
| 6175606 | Filter for a nuclear fuel assembly A fuel assembly (1) for a boiling water nuclear reactor comprising a plurality of vertical fuel rods (3) which are arranged in spaced relationship between a bottom tie plate (6) and a top tie plate (5). The bottom tie plate (6) is provided with through-ho... | 01/16/2001 |
| 6148054 | Removable separation devices for nuclear fuel bundles A support rod 14 carrying one or more separation devices 12, e.g., swirlers, is releasably secured in a fuel bundle. The support rod and separation devices are sized to pass through openings in the spacers S otherwise containing full length fuel rods. The... | 11/14/2000 |
| 6141397 | 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 ... | 10/31/2000 |
| 6088420 | Reactor core In a reactor core, there is charged a number of fuel assemblies composed of a channel box and a fuel bundle disposed therein, in which fuel rods adjacent to each other are arranged so as to provide a triangular shape and a ratio of a coolant channel cross... | 07/11/2000 |
| 5995577 | Optimized steam vent locations for a nuclear fuel bundle A nuclear fuel bundle has full-length and part-length fuel rods, the latter defining vent volumes interspersed among the full-length fuel rods. The vent volumes afford critical power enhancement by efficiently transferring liquid to adjacent full-length f... | 11/30/1999 |
| 5949839 | Fuel assembly for a boiling water reactor A fuel assembly for a boiling water reactor where the fuel assembly during operation is arranged vertically in the core of the reactor. The fuel assembly comprises a plurality of vertical fuel rods (22) arranged in one or more fuel bundles, wherein at lea... | 09/07/1999 |
| 5914995 | Nuclear reactor fuel assembly A nuclear reactor fuel assembly includes a fuel assembly base, a fuel assembly head and mutually parallel fuel rods containing nuclear fuel and extending between the fuel assembly head and the fuel assembly base. A water tube having first and second open ... | 06/22/1999 |
| 5872826 | Fuel assembly channel box having burnable poison A channel box for a nuclear-reactor fuel assembly (MOX fuel assembly) containing plutonium, capable of properly controlling the excess reactivity without mixing neutron absorber or burnable poison into a fuel rod, and a channel box for a nuclear-reactor f... | 02/16/1999 |
| 5859888 | Part length fuel rod extension In a fuel bundle for a boiling water nuclear reactor comprising a plurality of fuel rods secured within an array and extending between upper and lower tie plates, and including at least one additional fuel rod extending from the lower tie plate but termin... | 01/12/1999 |
| 5859886 | Fuel assembly for a boiling water reactor A fuel assembly for a boiling water reactor comprises a bottom tie plate, a top tie plate, and a first and a second group of vertical fuel rods, each including a column of fuel pellets surrounded by a cladding tube. The second group of fuel rods has a sho... | 01/12/1999 |
| 5809101 | Handle unit for a fuel assembly in a nuclear reactor and fuel assembly having modified channel A fuel bundle assembly for a nuclear reactor includes a modified channel and a handle unit that improves pressure drop performance. With the modified channel, one approach is to vary the outside dimension of the fuel channel along the length of the channe... | 09/15/1998 |
| 5787140 | Handle assembly and channel for a nuclear reactor fuel bundle assembly A fuel bundle assembly for a nuclear reactor includes a modified channel that improves pressure drop performance and a handle assembly that includes structure for preventing a broken end plug from escaping the fuel bundle. In modifying the channel, one ap... | 07/28/1998 |
