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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...
7558360 Core catcher cooling  
An assembly includes a base grid configured to be disposed below a pressure vessel and spaced vertically above a floor of a containment vessel to define a sump therebetween. The assembly further...
7532699 Nuclear facility and method for operating a nuclear facility  
A nuclear facility contains a flood tank, which is provided for holding a cooling liquid, a condensation chamber, and an overflow device, which leads from the flood tank to the condensation chamber...
7492851 Clamp for feedwater sparger end bracket assemblies and method of preventing separation of feedwater sparger end bracket assemblies  
A constrained feedwater sparger end bracket assembly comprises a boiling water reactor vessel, a feedwater sparger including a conduit within the vessel, a feedwater sparger end bracket assembly...
7245688 Cooling system  
This invention relates to a nuclear reactor plant which includes a nuclear heat source ( 12 ), and a cooling system ( 10 ). The cooling system ( 10 ) includes at least two cooling circuits ( 26 ),...
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...
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...
6895068 Method for providing a pressurized fluid  
In order, in a pressure accumulator, to generate a required operating pressure of a fluid situated in the pressure accumulator, a heater device is provided, disposed in an upper region of the...
6865244 Device and method for cooling a reactor pressure vessel of a boiling water reactor plant  
In order to allow a reliable and passive external cooling of a reactor pressure vessel of a boiling water reactor, outside the reactor pressure vessel a differential-pressure measurement pipe is...
6839396 Control device for a cooling circuit  
Control device for a cooling circuit which enables a pressure tank of a reactor to be cooled even when a serious failure occurs, without having to resort to the use of external energy. One or more...
6781331 Method and apparatus for regulating motor generator output  
A method and system of regulating an output voltage of a boiling water reactor nuclear reactor plant recirculation system motor generator are provided. The method includes sensing an alternator...
6618461 Systems and methods to enhance passive containment cooling system  
A nuclear reactor containment cooling system includes a containment vessel having a drywell and a wetwell, a cooling condenser submerged in a cooling pool of water located outside the containment...
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...
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...
6481757 Core spray system attachment assemblies  
A core spray sparger for use in a nuclear reactor pressure vessel. The core spray sparger includes a plurality of core spray lines, a coupling apparatus, a bracket assembly, and an end clamp...
6477220 Flexible penetration attachment for strainers  
A flexible penetration attachment for BWR wet-well strainers is provided that causes a suction pipe to communicate with liquid in the wet-well through an aperture in a wet-well wall. The...
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...
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...
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...
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...
6311897 Passive pulse generator and method for activating a fitting with a passive pulse generator  
A passive pulse generator can be connected to a line in order to activate a safety fitting in a nuclear power plant. The line can be closed by a closure element. In the event of a temperature...
6293593 Collar clamp assembly for repairing core spray piping  
A collar clamp assembly is disclosed for repairing and providing a temporary seal around leaking pipe coupling areas of an internal core spray system of a nuclear reactor. The clamp assembly...
6243432 Modified passive containment cooling system for a nuclear reactor  
Modified passive containment cooling systems for cooling a reactor core of a boiling water nuclear reactor are described. The reactor core is positioned in a reactor pressure vessel which is...
6236700 Downcommer coupling apparatus and methods  
Downcommer coupling apparatus and methods for replacing a core spray line downcommer pipe coupled to a shroud T-box are described. In one embodiment, the coupling apparatus includes a wedge flange,...
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...
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...
6160863 Variable speed pump for use in nuclear reactor  
A nuclear reactor coolant system includes a primary coolant circuit connected to a secondary coolant circuit. A desired amount of coolant is bled from the primary circuit to the secondary circuit...
6131962 Core spray line coupling apparatus and methods  
Coupling apparatus and methods for replacing a core spray line downcomer pipe coupled to a shroud T-box are described. In one embodiment, the coupling apparatus includes a seal ring, a mating...
6097778 Gravity driven suction pump system, methods, and apparatus  
A gravity driven suction pump for a nuclear reactor condenser is described. The gravity driven suction pump is utilizes the potential energy of the condenser condensate to move condensible and...
6069930 Modified passive containment cooling system for a nuclear reactor  
Modified passive containment cooling systems for cooling a reactor core of a boiling water nuclear reactor are described. The passive containment cooling system (PCCS), in one form, includes a vent...
6026138 Method and device for safeguarding the discharge of residual heat from a reactor of a nuclear power station  
A method for safeguarding discharge of residual heat from a nuclear power station reactor upon a lowered filling level in a primary circuit of a reactor cooling system, includes initially shutting...
6000731 Assemblies and methods for coupling piping to a safe end of a nuclear reactor  
Thermal sleeve assemblies for connecting a core spray line to a reactor safe end without welding. In one embodiment the thermal sleeve assembly includes a t-box junction, a thermal sleeve and a...
5943384 Depressurization system for pressurized steam operated plant  
A depressurization system (1) for pressurized steam operated plant employing injection of cold water contained in a superelevated tank (5), said injection being triggered rapidly and in a manner...
5930319 Nuclear reactor with a core melt propagation space provided with a coolant conduit leading to a coolant reservoir  
A nuclear reactor includes a propagation space for core melt. The propagation space has a coolant conduit leading to a coolant reservoir and a device which opens in a temperature-dependent manner....
5912936 Pipe connector assembly  
Pipe connector assembly for replacing a core spray line in a nuclear reactor without field cutting, measuring, or welding such line. In one embodiment, the pipe connector assembly includes a first...
5901192 Core spray line riser apparatus and methods  
Core spray line riser repair apparatus and methods for axially restraining a reactor core spray line riser to a T-box are described. In one embodiment, the repair apparatus includes a sleeve, a...
5898748 Vacuum breaker valve assembly  
Breaker valve assemblies for a simplified boiling water nuclear reactor are described. The breaker valve assembly, in one form, includes a valve body and a breaker valve. The valve body includes an...
5896431 Systems and methods for preventing steam leakage between a drywell and a wetwell in a nuclear reactor  
Systems, methods, and apparatus for preventing steam leakage between a drywell and a wetwell in a nuclear reactor are described. In accordance with one embodiment of the present invention, the...
5839192 Method and apparatus for repairing cracked core spray supply piping in a boiling water reactor  
An apparatus for repairing cracked core spray supply piping in a boiling water reactor vessel includes a pair of clamps extending circumferentially around the piping on opposite sides of a crack...
5828714 Enhanced passive safety system for a nuclear pressurized water reactor  
A passive safety system for a nuclear reactor coolant system including a water storage tank, a heat exchanger positioned within the water storage tank and connected to the hot leg, and a core...
5825838 Reactor flooding system for a retaining molten core materials in a reactor vessel by the improved external vessel cooling capability  
A reactor cavity flooding system, which is used to immerse the hemispherical lower head of a nuclear reactor vessel by flooding the reactor cavity, is connected to both coolant injection nozzles...
5748693 Safety feed for borating system for a pressurized water reactor and process for operating such a system  
In the event of an incident in a pressurized water reactor with a safety feed and borating system, it is necessary that sufficient primary cooling water be available in the reactor cooling system...
5737380 Core spray line assembly  
A core spray line assembly for a nuclear reactor is described. In one embodiment, the core spray line assembly includes first and second core spray lines. Each of the core spray lines is...
5659591 Containment spray system for a light-water reactor  
A containment spray system for a light-water reactor includes a water trough being disposed in a safety tank. An immersion pump disposed in the vicinity of the bottom of the water trough, a spray...
5612983 Device for filtering water to an emergency cooling system in a nuclear power plant  
A device for filtering water to at least one emergency cooling system in a nuclear power plant of the type comprising a reactor arranged in a containment which substantially consists of an upright,...
5568527 Method and apparatus for remote ultrasonic inspection of core spray T-box welds  
A method and an apparatus for in situ ultrasonic inspection of the core spray T-box to thermal sleeve attachment weld and the core spray T-box to cover plate attachment weld in BWRs. The apparatus...
5519743 Primary coolant system of a nuclear power plant for providing coolant to a primary loop  
A primary coolant system of a nuclear power plant for providing coolant to a reactor vessel, the primary coolant system comprises a primary loop for transferring heat away from the reactor vessel....
5426681 Boiling water reactor with combined active and passive safety systems  
A boiling water reactor having an optimum combination of active and passive safety systems. By combining three active divisions (I,II,III)of the boiling water reactor with a passive fourth...
5377242 Method and system for emergency core cooling  
A nuclear reactor and emergency core cooling system. A nuclear reactor is provided with a cylinder around the core barrel that defines an annular channel therebetween. An injection nozzle is...
5360056 Temperature initiated passive cooling system  
A passive cooling system for cooling an enclosure only when the enclosure temperature exceeds a maximum standby temperature comprises a passive heat transfer loop containing heat transfer fluid...
Matches 1 - 50 out of 229 1 2 3 4 5 >