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| Number | Title | Issue Date |
| 8045672 | Core spray sparger T-box attachment and clamp and method for clamping A core spray sparger T-box clamp for a sparger T-box in a shroud of a nuclear reactor pressure vessel, the sparger T-box clamp including: an anchor plate substantially aligned with a closed end of the T-box; a carrier plate slidably secured to an upper side the anch... | 10/25/2011 |
| 8045673 | Core spray sparger T-box clamp assemblies and methods of using thereof Example embodiments are directed to core spray sparger T-box repairs, specifically, to universal core spray sparger T-box weldless clamps having remote-friendly operation and methods of using universal core spray sparger T-box weldless clamps. Example embodiment cla... | 10/25/2011 |
| 7983377 | Emergency core cooling system having core barrel injection extension ducts An emergency core cooling system directly injects emergency core cooling water, which is supplied from a high-pressure safety injection pump or a safety injection tank for a pressurized light water reactor, into a reactor vessel downcomer. A pipe connector is comple... | 07/19/2011 |
| 7929657 | Pressurised water nuclear reactor vessel The invention relates to a pressurised water nuclear reactor vessel, comprising: an outer casing which comprises at least one cylindrical shell and a dished bottom head, a core support plate, a vessel bottom head s... | 04/19/2011 |
| 7724863 | Core spray sparger T-box clamp apparatus and method for installing the same A core spray sparger T-box attachment assembly for a nuclear reactor pressure vessel, wherein the pressure vessel includes a shroud, a sparger T-box penetrating the shroud, a plurality of sparger distribution header pipes coupled to the sparger T-box, and a downcome... | 05/25/2010 |
| 7623611 | Core spray apparatus and method for installing the same A core spray T-box attachment assembly for a core spray nozzle includes a primary cruciform wedge and a secondary cruciform wedge in contact with the primary cruciform wedge to form a cruciform wedge subassembly adapted for insertion within a bore of the core spray ... | 11/24/2009 |
| 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 |
| 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 |
| 7231333 | Method and arrangement for developing core loading patterns in nuclear reactors In the method, a set of limits applicable to a core may be defined, and a test core loading pattern design, to be used for loading the core, may be determined based on the limits. Reactor operation on at least a subset of the core may be simulated to produce a plura... | 06/12/2007 |
| 7218068 | Power source for re-circulation pump and method of controlling the same A variable-voltage variable-frequency power source for an electric motor that drives a re-circulation pump for a boiling water nuclear reactor. The power source has a semiconductor electric power converter and a speed controller for controlling the semiconductor ele... | 05/15/2007 |
| 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 |
| 7203263 | Core spray apparatus and method for installing the same A core spray T-box attachment assembly for a core spray nozzle includes a primary cruciform wedge and a secondary cruciform wedge in contact with the primary cruciform wedge to form a cruciform wedge subassembly adapted for insertion within a bore of the core spray ... | 04/10/2007 |
| 7032655 | Anti-vibration tube support A tube support device comprises an elongated strip inserted in a tube lane between the tubes of the tube bundle. Raised-tube-engaging zones are disposed in transverse rows across the strip at successive longitudinal locations along its length; these tube-engaging zo... | 04/25/2006 |
| 6950489 | Guide tube for an instrumentation lance extending into a pressure vessel, reactor pressure vessel, and a method for preventing the accumulation of particles outside the pressure vessel in a guide tube The invention relates to a guide tube especially for an instrumentation lance extending into a reactor pressure vessel. The guide tube includes a lower tube section and an upper tube section that extends into the interior of the reactor pressure vessel. In order to ... | 09/27/2005 |
| 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 |
| 6901128 | Foreign matter filter for fuel assembly in pressurized water reactor A foreign matter filter provided between a DFBN and a lower grid has two adjacent thin straps assembled into a lattice. The straps are equipped on the front and back sides with axially continuous protrusions. ... | 05/31/2005 |
| 6876713 | Filter and fuel assembly for a light-water nuclear reactor A filter for separating particles from cooling water in a nuclear plant of light water model. The filter has an inlet end (2) and an outlet end (3) and allow flowing through of the cooling water in a flow direction z from the inlet end to the outlet en... | 04/05/2005 |
| 6847695 | Nuclear fuel assembly lower tie-plate and method of its assembling A fuel assembly lower tie-plate with better performance in capturing linearly elongated foreign substances. The lower tie-plate has a screening plate positioned below the network section in the lower tie-plate cavity. The screening plate is arranged substantially ho... | 01/25/2005 |
| 6813327 | Core support for an F-lattice core of a boiling water nuclear reactor A core plate assembly for a nuclear reactor includes a plurality of support beams, a flat plate positioned on top of the support beams, a plurality of control rod guide tube openings arranged in staggered rows, and a plurality of fuel supports extending through the ... | 11/02/2004 |
| 6690758 | Perforated debris catcher for a nuclear fuel assembly A nuclear fuel assembly includes a fuel bundle resting on a lower tie plate. The lower tie plate includes a grid having raised bosses disposed in a rectilinear array for receiving the end plugs of the fuel rods and webs interconnecting the bosses. Between... | 02/10/2004 |
| 6672330 | Valve bonded with corrosion and wear proof alloy and apparatuses using said valve A valve is characterized by excellent corrosion and wear resistance and maintainability due to use of a bonding corrosion and wear proof alloy containing non-continuously distributed eutectic carbide on the sliding portions of various types of apparatuses... | 01/06/2004 |
| 6608880 | Reduced pressure drop debris filter bottom nozzle for a fuel assembly of a nuclear reactor A reduced pressure drop debris filter bottom nozzle for use in a fuel assembly of a nuclear reactor includes a plate member formed with a plurality of first flow holes and a plurality of second flow holes. The first flow holes are oblong in cross section ... | 08/19/2003 |
| 6567493 | Core spray sparger assembly A core spray sparger assembly for supplying coolant to a nuclear reactor. The nuclear reactor includes fuel assemblies, a top guide, coolant supply pipes and a shroud head. The core spray sparger assembly includes at least one coolant manifold, at least o... | 05/20/2003 |
| 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 |
| 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 |
| 6456682 | Core spray sparger T-box attachment with clamp A core spray sparger T-box attachment assembly for a nuclear reactor pressure vessel includes a downcomer pipe coupling and a sparger T-box clamp. The downcomer pipe coupling includes a cylindrical outer housing, a center portion, and a plurality of vanes... | 09/24/2002 |
| 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 |
| 6421406 | Core spray upper T-box to safe end attachment A T-box assembly includes a T-box housing, a thermal sleeve coupled to the T-box housing, a cruciform wedge, a spider threadedly engaging the thermal sleeve, and a draw bolt coupling the cruciform wedge and the spider. At least one spring washer is locate... | 07/16/2002 |
| 6385271 | Nuclear fuel assembly The present invention relates to a fuel assembly for a light-water reactor with a substantially square cross section wherein the fuel assembly comprises a plurality of fuel rods (4). The fuel rods (4) extend between a bottom tie plate (5) and a top tie pl... | 05/07/2002 |
| 6345084 | Apparatus and methods for replacing a core spray T-box/thermal sleeve in a nuclear reactor A T-box/thermal sleeve assembly replaces a damaged T-box/thermal sleeve in a core spray nozzle of a nuclear reactor. To replace the parts, the T-box and a portion of the extant thermal sleeve are removed from a location within the reactor vessel wall. The... | 02/05/2002 |
| 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 |
| 6332012 | Grid strap for a nuclear fuel assembly, and a grid including such straps A nuclear fuel assembly grid has a plurality of mutually interleaved straps forming an array of fuel rod receiving cells. Each strap is formed with regularly distributed slots for interleaving with other straps of the grid. The strap has dimples located b... | 12/18/2001 |
| 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 |
| 6229868 | Nuclear fuel assembly The present invention relates to a fuel assembly for a light-water nuclear reactor with a substantially square cross section which comprises fuel rods (4) extending between a bottom tie plate (16) and a top tie plate (17). A coolant is adapted, during ope... | 05/08/2001 |
| 6201847 | Core spray upper T-box to reactor vessel attachment A T-box assembly to facilitate attaching a core spray line to a reactor core spray nozzle safe end without welding is described. In one embodiment, the T-box assembly includes a T-box housing, a cruciform wedge, and a draw bolt. The T-box housing is confi... | 03/13/2001 |
| 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 |
| 6173028 | Apparatus for promoting intermixing of heated coolant streams in nuclear reactor An apparatus for promoting intermixing of heated fluid streams within a nuclear reactor vessel is implemented in such structural configuration and disposition as to be capable of not only promoting uniform temperature distribution of a heated fluid stream... | 01/09/2001 |
| 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 |
| 6049581 | Nuclear fuel assembly with an upper cap The top nozzle (6) of the fuel assembly includes a transverse adaptor plate (6a) penetrated by openings (8) for fastening the guide tubes (4) and by openings (9) for water to pass through. The water passage openings (9a) in the adaptor plate (6a) of the t... | 04/11/2000 |
| 5943385 | Nuclear fuel assembly having a transition piece providing a reduced flow resistance In order to reduce the flow resistance of a coolant flowing through a passage in a support plate of a boiling water reactor and entering a transition piece at a lower end of a fuel assembly resting on the support plate, a lower rim of the transition piece... | 08/24/1999 |
