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Match Document Document Title
7616728 Nuclear reactor internals alignment configuration  
An alignment system that employs jacking block assemblies and alignment posts around the periphery of the top plate of a nuclear reactor lower internals core shroud to align an upper core plate...
7567645 Modular integrated head assembly  
A two-part integrated head assembly ( 100 ) is disclosed wherein the lower portion ( 110 ) attaches to, and is supported by, the reactor vessel closure head ( 90 ), and the upper portion ( 160 ) is...
7158605 Head assembly  
A head assembly for a reactor pressure vessel includes a removable closure head, an array of control rod drive mechanisms, a seismic support platform, a missile shield assembly and a cooling system...
7139359 Integrated head assembly for a nuclear reactor  
An integrated head assembly ( 100 ) is disclosed for a nuclear reactor. The preferred integrated head assembly includes a lift assembly ( 150 ) that supports the reactor vessel closure head ( 90 )...
6643349 Method of removing a large-sized apparatus from a reactor building of a nuclear plant  
In order to carry out a radioactivated reactor pressure vessel from a nuclear reactor building of a nuclear power plant, a first opening portion for carrying out the reactor pressure vessel is...
6639236 Radioactive material container  
A shielded rack loader makes use of a loading rack movable between a shielding structure and a storage tube. A shield plug seals the storage tube. A hoist moves the shield plug and the loading...
6618460 Integrated head assembly for a nuclear reactor  
An integrated head assembly ( 100 ) is disclosed for a nuclear reactor. The preferred integrated head assembly includes a lift assembly ( 150 ) that supports the reactor vessel closure head ( 90 )...
6594333 Thermal load reducing system for nuclear reactor vessel  
The present invention is used to reduce thermal load itself, being the cause to generate stress, which develops near liquid surface in a nuclear reactor wall and to contribute to further...
6570950 Nuclear plant containment with prefabricated component support structure  
A nuclear steam supply containment system employing prefabricated component supports that are surrounded by steel concrete forms and anchored to the floor liner of a nuclear containment. The...
6563900 Ring plate around openings in reinforced concrete containment vessel  
A reinforced concrete containment vessel in a nuclear reactor includes a cylindrical shell having a side wall. The side wall includes an opening and a plurality of reinforcing bars, at least one of...
6546066 Integrated head assembly for a nuclear reactor  
An integrated head assembly ( 100 ) is disclosed for a nuclear reactor. The preferred integrated head assembly includes a lift assembly ( 150 ) that supports the reactor vessel closure head ( 90 )...
6519308 Corrosion mitigation system for liquid metal nuclear reactors with passive decay heat removal systems  
A liquid metal nuclear reactor is described. The reactor includes a concrete reactor silo, and at least one primary vessel located in the reactor silo and coupled to a reactor shield deck. Each...
6492034 Heat shield  
In a heat shield ( 1 ), in particular for combustion chambers and for thermal fluid flow machines, the heat shield consists of a feltlike material ( 3 ) composed of compressed and sintered...
6452993 Method of carrying out large-sized apparatus  
When a radioactivated reactor pressure vessel is carried out from a nuclear reactor building of a nuclear power plant, a first opening portion for carrying out the reactor pressure vessel is...
6389094 Integral forged shroud flange for a boiling water reactor  
A forged upper shroud section which may be machined from a single piece rectangular cross-section ring forging and includes a circular flange and a cylindrical shell is described. Openings and...
6353651 Core catcher cooling by heat pipe  
A heat removal system for the under reactor pressure vessel area of a boiling water nuclear reactor system that provides both protection of the containment boundary from attack by molten core...
6327323 Multiple reactor containment building  
A nuclear power plant includes at least two reactor vessels enclosed within a single containment building. In a first embodiment, the reactor vessels and steam generators operate separately from...
6263037 Cutting zone for radioactive materials  
An enclosed cutting zone for use in a nuclear power plant. The cutting zone includes a cutting zone barrier and a transfer zone. The cutting zone includes a movable submergible upper rig, an upper...
6233300 Conical shaped seismic guide pins and mating openings  
A top guide to shroud head interface is described. In one embodiment, the interface includes a top guide that includes a flange that is configured to engage a corresponding flange of the shroud...
6195405 Gap structure for nuclear reactor vessel  
A gap forming structure for use with water cooled nuclear reactors is invented to prevent overheating and ultimately structurally failing of the lower head of a reactor vessel in a nuclear reactor...
6163588 Core plate and reactor internal pump differential pressure lines for a boiling water reactor  
A modular differential pressure measuring system for a boiling water nuclear reactor pressure vessel is described. The modular pressure differential system includes a plurality of pressure lines...
6133661 Rotating electric machine usable in radioactive environment  
The invention relates to a rotating electric machine including a coil of a wire having thereon an insulating coating comprising a polybenzimidazole. This rotating electric machine is stably...
6118838 Frame-held neutron-absorbing fuel rod assembly storage rack  
A nuclear fuel rod assembly storage rack comprises a rigid structure delimiting vacant spaces of square, cross-section and neutron-absorbing units also having a square cross-section prearranged...
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...
6067338 Reactor core shroud repair using thermally tensioned links to apply compression across shroud vertical seam weld  
An apparatus for repairing the core shroud of a nuclear reactor having one or more cracked vertical seam welds. The repair involves machining two holes in the shroud on opposing sides of the...
6064711 Flak jacket protective cover for spent nuclear fuel storage casks  
Spent nuclear fuel storage casks, particularly a protective and venting cover for such storage casks which are stored above ground. The protective and venting cover may be assembled from annular or...
6061415 Missile shield for a nuclear reactor pressure vessel  
An integrated head assembly for a nuclear reactor pressure vessel includes a closure head with CRDM assemblies extending upwardly from the head. A CRDM seismic support disposed above the closure...
6037517 Apparatus and method for treating waste materials which include charged particle emitters  
A reaction chamber (20) is charged with a reactant metal (18) which is heated to a molten state by a suitable heating arrangement (21). A field generating arrangement (17) generates a...
6021170 Nuclear reactor plant having a reactor pressure vessel with a core barrel and method for mounting the core barrel  
A nuclear reactor plant includes a reactor pressure vessel having a core barrel supported on a cylindrical holding structure fixed in the reactor pressure vessel. The core barrel has a lower part...
6009137 Mid-shroud joint for a boiling water reactor  
A mid-shroud joint which improves the replaceability of the shroud is described. In one embodiment, the shroud includes a core shroud and a lower shroud. A core plate support flange is clamped...
5925313 Aluminum base alloy containing boron and manufacturing method thereof  
There is provided an Al base alloy containing boron which is superior in mechanical properties such as strength, ductility or workability and the like and has a neutron absorbing capacity and an...
5828713 Replacement core shroud assembly for a boiling water reactor  
A method of replacing a boiling water reactor core shroud includes the steps of removing at least a portion of the existing core shroud from supporting structure in the reactor vessel, lowering a...
5802129 Mechanically joined replacement shroud for 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 pressure vessel wall, with an annular shroud...
5770534 Ceramic composition for absorbing electromagnetic waves and method for manufacturing the same  
A ceramic composition for absorbing electromagnetic waves and a method for manufacturing the same are disclosed. The composition comprises a raw powder comprising by weight between about 60% and...
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...
5742652 Head assembly  
An integrated head assembly for a nuclear reactor pressure vessel includes a closure head with CRDM assemblies extending upwardly from the head. A CRDM seismic support disposed above the closure...
5737378 Reactor shroud joint  
A shroud for a nuclear reactor is described. In one embodiment, the shroud includes first and second shroud sections, and each shroud section includes a substantially cylindrical main body having a...
5729581 Core shroud, in particular for cladding a reactor core in a boiling-water nuclear reactor and a method for repairing a core shroud  
Core shrouds are conventionally welded together from cylindrical parts and annular flanges, wherein cracks have recently occurred in the region of weld seams in reactors of the boiling-water type....
5715288 Integral head rig, head area cable tray and missile shield for pressurized water reactor  
In order to reduce the number of lifts which are required to remove the various equipment normally disposed above the reactor pressure vessel and to make way for refuelling or regular maintenance,...
5687206 Method of replacing a boiling water reactor core shroud  
A method of replacing a boiling water reactor core shroud includes the steps of removing at least a portion of the existing core shroud from supporting structure in the reactor vessel, lowering a...
5683216 Spring latching mechanisms for preventing relative movement of assembled components  
Spring latching mechanisms for preventing relative rotation or relative displacement of assembled components during operation of a nuclear reactor. The first type of mechanism prevents rotation of...
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...
5629963 Storage tank for a radioactive fissile material solution  
A storage tank for radioactive fissile material solutions. The tank comprises at least one cell containing a radioactive solution and a solid neutron-absorbing material while preventing any risk of...
5588031 Apparatus for reinforcing a reactor vessel core shroud  
An apparatus, which reinforces a shroud that is contained within a reactor vessel, is operable for reinforcement of the shroud in the event of cracking in the shroud. The apparatus comprises a...
5583899 Removable retrofit shroud for a boiling water nuclear reactor and associated method  
In a pressure vessel of a nuclear reactor containing a core assembly enclosed within a core shroud, the shroud spaced radially inwardly of a side wall of the pressure vessel, and an annular pump...
5580658 Copper-carbon composite material with graded function and method for manufacturing the same  
A function ally gradient composite material containing copper and carbon as main components and having a predetermined shape, in which the composition ratio of the copper to the carbon in the...
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...
5570402 Control rod housing support system with radiation shield rings  
A boiling water reactor control rod drive support system having radiation shields to protect persons working under the reactor vessel from radiation exposure and to limit the travel of a control...
5525408 Radiation - shielding material  
A radiation shielding element especially for use in the temporary shielding of ancillary equipment or apparatus in nuclear-powered steam raising installations, said element comprising a flexible...
5498825 Plutonium and nuclear toxic waste storage depot and method  
A method of removing radioactivity from the interior of a building by transporting radioactive material within a slurry, precipitating out or otherwise filtering out the then contaminated material...
Matches 1 - 50 out of 318 1 2 3 4 5 6 7 >