Class 376/400 - With core bypass means (e.g., passage along core barrel or through shield structure)

Subclass of Class 376 - Induced nuclear reactions: processes, systems, and elements
Definition: Subject matter wherein the flow path or pattern of the altered
No. of patents: 33
Last issue date: 05/07/2002

Number	Title	Issue Date
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
5623526	Method and apparatus for repair of nuclear reactor shroud In order to support a shroud against bending, shear, stress and torsion, straps which are preferably formed of the same material as the shroud, are placed in strategic positions with respect to cracks or the like type of weaknesses which have been detecte...	04/22/1997
5574760	Method and apparatus for supporting a shroud in a nuclear reactor In order to eliminate the need to weld, drill or otherwise machine a shroud structure which is used to surround a plurality of fuel assemblies in a nuclear reactor, a plurality of upper hanger rods interconnect a structure above the shroud to a support ri...	11/12/1996
5319692	Nuclear reactor reflector A nuclear reactor reflector is disclosed that comprises a stack of reflector blocks with vertical water flow passages to cool the reflector. The interface between blocks is opposite support points for reactor fuel rods. Water flows between the reflector a...	06/07/1994
5263069	Pressurized water reactor with solid partitioning A pressurized water reactor has a solid reflector formed of a stack of rings each completely surrounding the reactor core, whose internal periphery matches the external contour of the core. Keys fixed to the casing project into vertical grooves formed in ...	11/16/1993
5257295	Core baffling device for nuclear reactors A partitioning device is provided which can be used in a pressurized water nuclear reactor. It occupies the space between the prismatic shaped core of the reactor, and a cylindrical casing and comprises vertical partitioning plates surrounding the core an...	10/26/1993
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
5061435	High-temperature reactor High temperature reactor with residual-heat transfer system comprises a cooling gas intake at the bottom and cooling gas outlet at the top so that a cooling gas can flow from the bottom to the top through the reactor core. In order to assure reliable heat...	10/29/1991
4997620	Process and device for limiting the intensity of parasitic jets of cooling water in a pressurized-water nuclear reactor During a shutdown of the reactor, a device for partially closing off (27) the openings (26) of the reinforcements (6) located below the upper reinforcement (6a) is introduced through the opening (25) of the upper reinforcement (6a) of the partitioning of ...	03/05/1991
4941159	Low neutron fluence nuclear reactor internals A new design for nuclear reactor internals resulting in reduced fast neutron leakage to the reactor vessel. The first step of the two-stage process reflects high energy or fast neutrons back into the core, by placement of a reflector made of tungsten, sta...	07/10/1990
4925624	Pressurized water nuclear reactor with solid partitioning A pressurized water nuclear reactor with solid partitioning comprises a core formed by assemblies of prismatic shape disposed side by side inside a vertical cylindrical casing. A space between the core and the casing receives a solid partitioning structur...	05/15/1990
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
4820476	System and method for plugging the core barrel of a nuclear reactor An improved plugging system for plugging chamfered flow ports of small diameters in the core barrel of a pressurized water nuclear reactor is disclosed herein. The system is comprised of improved core barrel plugs that are telescopically contractible to f...	04/11/1989
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
4764339	High flux reactor A high flux reactor is comprised of a core which is divided into two symetric segments housed in a pressure vessel. The core segments include at least one radial fuel plate. The spacing between the plates functions as a coolant flow channel. The core segm...	08/16/1988
4751043	Radial neutron reflector A radial neutron reflector is disclosed for a light water nuclear reactor. The irregular space between the core periphery and the core barrel surrounding the core is filled with a structure comprising material other than hydrogen such as zirconia or stain...	06/14/1988
4675152	Nuclear reactor with core partitioning by bracing rods and plates A nuclear reactor with juxtaposed prismatic fuel assemblies cooled by the flow of a liquid in a cylindrical jacket. A partitioning of the core between the peripheral assemblies and the jacket is constituted by rods parallel to the assemblies, guided later...	06/23/1987
4649609	Apparatus and process for providing an alternate coolant path in the core of a nuclear reactor Both an apparatus and process for providing a coolant flow path in the top former plate of the core of a nuclear reactor are disclosed. The apparatus of the invention generally comprises an elongated tool support member having a tool mounting means for de...	03/17/1987
4576778	Core barrel plug The invention comprises a core barrel plug capable of being remotely installed in a port of a core barrel of a pressurized water nuclear reactor for converting the reactor from a by-pass downflow configuration to a by-pass upflow configuration. The plug c...	03/18/1986
4560531	Device for partitioning off the core of a nuclear reactor A device for partitioning off the core of a nuclear reactor, including transverse plates (17) attached to the envelope (8) of the core and arranged transversely with respect to the fuel assemblies (5), and second plates (19) extending in the longitudinal ...	12/24/1985
4462956	Apparatus for partitioning off the core of a nuclear reactor with removable elements Apparatus for partitioning off the core of a nuclear reactor constituted by a set of boxes (8, 9, 10, 11) each comprising at least two plates (12-13, 14-15, 27-29, 28-30) rigidly assembled at right angles and disposed in the longitudinal direction of the ...	07/31/1984
4187147	Recirculation system for nuclear reactors A recirculation system for use in pressurized water nuclear reactors to increase the output temperature of the reactor coolant, thereby achieving a significant improvement in plant efficiency without exceeding current core design limits. A portion of the ...	02/05/1980
4158605	Nuclear core baffling apparatus Apparatus for baffling the flow of reactor coolant fluid into and about the core of a nuclear reactor. The apparatus includes a plurality of longitudinally aligned baffle plates with mating surfaces that allow longitudinal growth with temperature increase...	06/19/1979
4111747	Packed rod neutron shield for fast nuclear reactors A fast neutron nuclear reactor including a core and a plurality of vertically oriented neutron shield assemblies surrounding the core. Each assembly includes closely packed cylindrical rods within a polygonal metallic duct. The shield assemblies are less ...	09/05/1978
4082608	Cooling of pressurized water nuclear reactor vessels The improvement of pressurized water nuclear reactor vessels comprising flow dividers providing separate and distinct passages for the flow of core coolant water from each coolant water inlet, the flow dividers being vertically disposed in the annular flo...	04/04/1978
4080255	Horizontal baffle for nuclear reactors A horizontal baffle disposed in the annulus defined between the core barrel and the thermal liner of a nuclear reactor thereby physically separating the outlet region of the core from the annular area below the horizontal baffle. The horizontal baffle pre...	03/21/1978
4080257	Baffle-former arrangement for nuclear reactor vessel internals A baffle-former arrangement for the reactor vessel internals of a nuclear reactor. The arrangement includes positioning of formers at the same elevations as the fuel assembly grids, and positioning flow holes in the baffle plates directly beneath selected...	03/21/1978
4048011	Fast nuclear reactor The herein proposed fast nuclear reactor comprises a vessel, a liquid metal coolant filling said vessel, the side wall of which is cylindrical in shape and has its axis disposed in a horizontal plane. The vessel accommodates a core and heat exchangers wit...	09/13/1977
4039377	Nuclear boiler In a pressurized-water reactor (PWR), the top flange of the pressure vessel is penetrated by nozzles connected to vertical primary heat-exchangers which are located outside the vessel and above the level of connection. The heat exchangers and the primary ...	08/02/1977
4038136	Support structure for the lateral neutron shield system of a fast reactor core A hexagonal ring structure whose internal contour conforms to the external contour of the reactor core rests on the periphery of the reactor diagrid and is constituted by a plurality of layers of metallic plates. The layers are maintained in relative posi...	07/26/1977
4030972	Fluidly driven control rod A fluid driven actuator for a neutron absorber in a nuclear reactor is of the piston and cylinder type. The actuator is located above the reactor core. Means are provided for alternately opening and closing a by-pass fluid flow path or passage through or ...	06/21/1977
4001079	Thermal baffle for fast-breeder reacton A liquid-metal-cooled fast-breeder reactor includes a bridge structure for separating hot outlet coolant from relatively cool inlet coolant consisting of an annular stainless steel baffle plate extending between the core barrel surrounding the core and th...	01/04/1977

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Class 376/400 - With core bypass means (e.g., passage along core barrel or through shield structure)