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| Number | Title | Issue Date |
| 6580085 | Transport container for nuclear fuel assemblies A transport container for nuclear fuel assemblies, of right prismatic shape, which has an external envelope and an internal structure defining at least one housing for receiving and holding a fuel assembly.... | 06/17/2003 |
| 6542567 | Grid for nuclear fuel assembly and a strap for such a grid At regular intervals, the grid strap has formed therein notches for assembly with transverse straps. Between at least some pairs of notches, it has a rod-holding spring comprising two resilient strips cut out from the plane wall of the strap and integral ... | 04/01/2003 |
| 6430247 | Method and system for monitoring at least one operating parameter of the core of a nuclear reactor Neutron flux is measured using a subset of detectors (8) selected from a set of detectors (8) introduced into fuel assemblies (2) of the core (1) to obtain measurement signals, the number n of detectors (8) of the subset being at most equal to 15% of the ... | 08/06/2002 |
| 6419387 | Method and device for the inspection of a material by thermal imaging A heating zone (22) and a detection zone (23) at the surface (1a) of a part (1) are displaced in such a way as to carry out the scanning of the surface (1a) and a flux radiated in the detection zone (23) is detected by using a line of detectors (21) which... | 07/16/2002 |
| 6400786 | Process and device for monitoring at least one operating parameter of the core of a nuclear reactor During operation of the nuclear reactor, at specified time intervals, a neutron flux is measured using a set of neutron flux detectors which are fixed and arranged in the core (1) of the nuclear reactor, the maximum number n of detectors (8) being 15% of ... | 06/04/2002 |
| 6343874 | Method for the inspection of a part by thermal imaging The scanning of a surface of a part is carried out by a means of imparting heat to at least one heating zone at the surface of the part. This occurs by relative displacement of the part and of the means of imparting heat. A detector is used to sense the f... | 02/05/2002 |
| 6302064 | Steam generator comprising a flow distribution baffle The flow distribution baffle (14) is placed inside the bundle wrapper (7) of the steam generator, at its lower part,-near the steam generator tube plate. Passing through the flow distribution baffle (14) are openings (17, 18) for the passage of tubes of t... | 10/16/2001 |
| 6221286 | Nuclear fuel having improved fission product retention properties A nuclear fuel based on UO2, ThO2 and/or PuO2 having improved retention properties for fission products. The fuel comprises a metal such as Cr or Mo able to trap oxygen in order to form an oxide having a free formation ent... | 04/24/2001 |
| 6193145 | Method for joining two parts of different kinds by heterogeneous butt welding, and uses thereof An end portion of each of two parts is machined and the machined end portion of the parts are arranged in facing positions to form a welding bevel extending in a longitudinal direction between the parts, whereafter a filler metal is deposited into the wel... | 02/27/2001 |
| 6173680 | Steam generator comprising an improved feedwater supply device The steam generator comprises a cylindrical outer jacket (2) arranged with its axis vertical, a bundle wrapper (4) arranged coaxially with respect to the outer jacket and a space (9) in which feed water can flow between the bundle wrapper (4) and the oute... | 01/16/2001 |
| 6080960 | Method for joining two parts by heterogeneous welding and use thereof The machined ends of two parts (2, 4) are arranged in facing positions to form a welding bevel (6) between the parts (2, 4). A series of layers of filler metal are deposited one on top of the other in the welding bevel (6) in a direction thereof correspon... | 06/27/2000 |
| 6051972 | Eddy current inspection of tubes with magnetic saturation by a concentrated magnet generated magnetic field The apparatus enables eddy current inspection of a metal tube having a thin layer on its outside face with magnetic or electrical characteristics that are different from those of the metal in-depth. The apparatus comprises a measurement head having a meas... | 04/18/2000 |
| 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 |
| 6047474 | Method of manufacturing a bimetallic turbine blade and use thereof A receiving cavity having a simple geometrical shape is machined in a metallic block having a simple geometrical shape made of a first metallic material. A member made of the second material is made and fixed into the cavity to produce a composite bimetal... | 04/11/2000 |
| 6033493 | Process for coating a passivatable metal or alloy substrate with an oxide layer, and fuel assembly cladding and guide tubes and spacer grid coated with an oxide layer Surface preoxidation of the substrate is carried out by bringing the substrate into contact with an oxidizing gas excited by a cold plasma, the substrate being situated in the flowing afterglow of the cold plasma used to excite the oxidizing element and b... | 03/07/2000 |
| 6002736 | Dismountable fuel assembly of a nuclear reactor cooled by light water The fuel assembly includes an arrangement for quickly fixing the guide thimble into an opening passing through the adaptor plate of a dismountable nozzle of the assembly. This arrangement includes at least two bearing stops inside the opening of the nozzl... | 12/14/1999 |
| 5999585 | Nuclear fuel having improved fission product retention properties A nuclear fuel based on UO2, ThO2 and/or PuO2 having improved retention properties for fission products. The fuel comprises a metal such as Cr or Mo able to trap oxygen in order to form an oxide having a free formation ent... | 12/07/1999 |
| 5948356 | Process for high-pressure sterilization of products A semi-continuous process for high-pressure sterilization of a liquid or solid product, in which the sterilization of successive volumes of the product is performed by compressing the product at high pressure in a variable treatment chamber of generally t... | 09/07/1999 |
| 5940464 | Tube for a nuclear fuel assembly, and method for making same A zirconium alloy tube for forming the whole or the outer portion of a nuclear fuel pencil housing or a nuclear fuel assembly guide tube. The zirconium alloy contains 0.8-1.8 wt. % of niobium, 0.2-0.6 wt. % of tin and 0.02-0.4 wt. % of iron, and has a car... | 08/17/1999 |
| 5889832 | Nuclear reactor control cluster having removable rods The control cluster has a spider constituted by a hub connectable to a drive shaft. Fins radiate from a bottom portion of the hub and provided with vertical fingers distributed in a regular array. It also includes rods provided with plugs that are releasa... | 03/30/1999 |
| 5887045 | Zirconium alloy tube for a nuclear reactor fuel assembly, and method for making same A tube of zirconium-based alloy for constituting all or a portion of a cladding or guide tube for a nuclear fuel assembly. The tube is made of an alloy containing, by weight, 1.0-1.7% of tin, 0.55-0.80% of iron, 0.20-0.60% total of chromium and/or vanadiu... | 03/23/1999 |
| 5852644 | Guide tube for a nuclear fuel assembly A control rod guide tube for a nuclear reactor fuel assembly consists of several mutually portions of zirconium-based alloy. They define a passage that is narrow in a bottom portion of the tube. The guide includes a top length extending over at least 70% ... | 12/22/1998 |
| 5852642 | Method and apparatus for inspecting the geometry of a guide tube The apparatus is for internal inspection of a guide tube of a nuclear fuel assembly and measurement of deformations of a zone of smaller diameter in a terminal portion of the tube. The apparatus has a stick whose distal portion presents, in succession, st... | 12/22/1998 |
| 5852645 | Fuel assembly with consumable poison, and a method of operating a reactor The fuel assembly for a pressurized water reactor comprises rods distributed at the nodes of a square array and containing the fuel material. Some of the rods have a first mass concentration of gadolinium lying in the range 5% to 12%. Four to twelve addit... | 12/22/1998 |
| 5848363 | Process and device for treatment of an aqueous effluent containing an organic load In order to treat an aqueous acid effluent resulting from the decontamination of a component of a nuclear power station, the effluent containing an organic load comprising an organic reducing agent and nitrate ions and at least one oxidizing compound is i... | 12/08/1998 |
| 5844958 | Dismountable fuel assembly of a nuclear reactor cooled by light water The fuel assembly includes an arrangement for quickly fixing the guide thimble into an opening passing through the adaptor plate of a dismountable nozzle of the assembly. This arrangement includes at least two bearing stops inside the opening of the nozzl... | 12/01/1998 |
| 5835547 | Method and apparatus for inspecting the rods of a nuclear reactor control cluster The apparatus for inspecting the rods of a cluster insertable in the core of a nuclear reactor comprises a body provided with sliding guide means for rods in m different orientations of the cluster, m being a submultiple of the number n of rods in the clu... | 11/10/1998 |
| 5833767 | Method for cleaning a tube plate of a heat exchanger from inside the bundle of the heat exchanger At least two pivoting jets (55a, 55b, 55c) of cleaning liquid, each directed between two successive lines of tubes substantially perpendicular to the rows of tubes, are sent, in succession, from locations situated inside the bundle of the steam generator,... | 11/10/1998 |
| 5828711 | Sealing device for an instrumentation column A sealing device comprising a supporting assembly (9) containing sealing members (16) supporting the instrument column (5), and an assembly (17, 18) for lifting the instrument column (5) in sealing engagement with the supporting members (16). The sealing ... | 10/27/1998 |
| 5812624 | Core of a pressurized water nuclear reactor and top nozzle of a fuel assembly of the core Each of the square top nozzles (26) of the fuel assemblies of the core includes four locating openings (40) in the vicinity of the vertices of the nozzle. The set of locating pins (35) of the upper core plate (32) includes four pins at each of the positio... | 09/22/1998 |
| 5805651 | Device for measuring at least one physical parameter inside the core of a nuclear reactor The measurement device includes a means (18) for leaktight passage of a measurement conduit (20), produced in the form of a thimble, and an element (25) for connecting the end of the measurement conduit (20) to a smooth cylindrical extension element. The ... | 09/08/1998 |
| 5802128 | Device for recovery of fluid contained in the coolant circuit of a nuclear reactor The recovery device includes a first tank containing a volume of water open in the inner space of the safety containment and a closed second tank isolated from the inner space of the safety containment. The second tank is smaller than the first tank, and ... | 09/01/1998 |
| 5802130 | Zirconium-based alloy tube for a nuclear reactor fuel assembly A tube for constituting all or part of a cladding or guide tube for a fuel assembly is made from an alloy containing, by weight, 0.4% to 0.6% of tin, 0.5% to 0.8% of iron, 0.35% to 0.50% of vanadium, and 0.10% to 0.18% of oxygen, 100 ppm to 180 ppm of car... | 09/01/1998 |
| 5788934 | Process and machine for high-pressure sterilization of products A high-pressure sterilization apparatus for the implementation of a semicontinuous process for high-pressure sterilization of a liquid or solid product, in which the sterilization of successive volumes of the product is performed by compressing the produc... | 08/04/1998 |
| 5782255 | Method and device for cleaning a tube plate of a heat exchanger from inside the bundle of the heat exchanger At least two pivoting jets (55a, 55b, 55c) of cleaning liquid, each directed between two successive lines of tubes substantially perpendicular to the rows of tubes, are sent, in succession, from locations situated inside the bundle of the steam generator,... | 07/21/1998 |
| 5771266 | Device for joining together two plates of the baffle assembly of the core of a nuclear reactor The device (15) for joining together a first plate (7) and a second plate (8)of the baffle assembly, which are located substantially at right angles, includes a screw (16) engaged in a housing consisting of an opening (18) passing through the first plate ... | 06/23/1998 |
| 5754611 | Method and device for measuring at least one characteristic length on a fuel rod arranged at the periphery of a nuclear fuel assembly An eddy-current probe (10) is moved in the axial direction of the clad of the rod (1), a first position of the probe (10) is determined in the axial direction, for which a signal from the probe is representative of the presence of the internal surface of ... | 05/19/1998 |
| 5751778 | Method for captively attaching a guide cone of tubular shape and a thermal sleeve of an adaptor passing through the head of the vessel of a nuclear reactor The method comprises providing an annular cavity in an internal part of a tapped bore of the guide cone, screwing the tapped bore of the guide cone onto the threaded end of the thermal sleeve and expanding at least part of the end of the thermal sleeve ra... | 05/12/1998 |
| 5748689 | Sealing device for an instrumentation column penetrating the head of the vessel of a nuclear reactor inside an adapter The instrumentation column (5) comes to bear via a bearing surface and a sealing gasket (16) inside a bearing element including a tubular length (8) and a closure cover (11) joined together by screwed assembly means. The tubular length (8) and the cover (... | 05/05/1998 |
| 5742655 | Neutron-absorbent control cluster for a nuclear reactor A control cluster for a water cooled and moderated nuclear reactor, comprises a spider and rods suspended from the spider. Each rod contains neutron-absorbing material. In a lower portion of each rod, the material is a metal neutron absorber. In an upper ... | 04/21/1998 |
