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7424412 Method of determining nuclear reactor core design with reduced control blade density  
In the method, a reference core design is generated based on a defined set of limits. The set of limits may include a target hot excess reactivity constraint to be satisfied over a given core...
7403585 Optimally moderated nuclear fission reactor and fuel source therefor  
An improved nuclear fission reactor of the continuous fueling type involves determining an asymptotic equilibrium state for the nuclear fission reactor and providing the reactor with a...
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...
7200541 Method and arrangement for determining nuclear reactor core designs  
In the method, a set of limits are defined and a reference core design is generated based on the limits, and includes an initial loading pattern of current fresh fuel bundles arranged in a...
6977983 Nuclear power plant and a method of conditioning its power generation circuit  
In a nuclear power plant making use of a high temperature gas cooled reactor, it is necessary, prior to commencing power generation and connection of a generator to an electrical distribution grid,...
6865245 Guide ring to control granular mixing in a pebble-bed nuclear reactor  
A guide ring is positioned in the reactor core vessel of a pebble-bed nuclear reactor to segregate fuel pebbles and reflector pebbles fed into the vessel through respective conduits. The reflector...
6862331 Reactor core cooling structure  
A reactor core cooling structure of the present invention comprises cooling gas flow-in slits for making a cooling gas flow in a circular reactor core, which slits are provided at an outer graphite...
6804320 Automatically scramming nuclear reactor system  
An automatically scramming nuclear reactor system. One embodiment comprises a core having a coolant inlet end and a coolant outlet end. A cooling system operatively associated with the core...
5978434 Pebble bed reactor  
The invention relates to a pebble bed reactor comprising a core cavity filled with spherical fuel elements and bounded by reflector material. Spherical fuel elements pass through the core cavity...
5774514 Energy amplifier for nuclear energy production driven by a particle beam accelerator  
A method for producing energy from a nuclear fuel material contained in an enclosure, through a process of breeding of a fissile element from a fertile element of the fuel material via a...
5428653 Apparatus and method for nuclear power and propulsion  
A bimodal nuclear power and propulsion system for space is disclosed. Closed cycle heat engines are in operative association with each sector of a sectored reactor core. Heat exchangers employing...
5309492 Control for a closed cycle gas turbine system  
A throttle valve having defined characteristics controls flow of gas from a gas heater to a turbine in a closed cycle gas turbine system. The gas heater may be a nuclear reactor fueled by fission...
5289512 Nuclear propulsion reactor  
A nuclear propulsion reactor. A reactor vessel is provided with an annular first core and a cylindrical second core that is radially encompassed by the first core. Nuclear fuel elements in the...
5265134 Gas-cooled nuclear reactor plant with a heat exchanger for removing afterheat  
If an emergency arises in gas-cooled nuclear reactor plants having a heat exchanger for removing afterheat due to failure of a blower, the afterheat can be only inadequately removed because of the...
5255509 Particle bed reactor-powered turbine engine  
The combustion chamber and associated fuel injection and ignition equipment of a turbine engine is removed and replaced with a particle bed reactor. The reactor has central fuel elements removed to...
5225153 Pebble-type high temperature gas reactor  
A multiplicity of pebble-bed cores are housed within separate concrete cavities of a multi-cavity prestressed concrete pressure vessel. Primary cooling systems, one for each pebble-bed core, are...
5173251 Mixing apparatus for fluids  
A mixing apparatus for a plurality of turbulently flowing fluid flows varying in temperature and/or composition includes a mixing chamber having a non-circular or predetermined cross section and a...
5114667 High temperature reactor having an improved fluid coolant circulation system  
A high temperature reactor has a downflow type nuclear reactor provided at the top portion thereof with a gas inlet and a plurality of steam generators provided around the nuclear reactor. The...
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...
5051230 Nuclear reactor of a ball-bed type for batch-wise use of core fuel balls replaced by a new batch at relatively long intervals  
A ball-bed (pebble-bed) nuclear reactor, instead of having fuel elements more or less continuously withdrawn and new or reconstituted fuel elements more or less continuously reintroduced, is...
5047204 Nuclear fuel element for a particle bed reactor  
A nuclear fuel element for a particle bed reactor. Concentric inner and outer porous cylinders attached at either end define an annulus therebetween that contains a fuel particle bed of nuclear...
5037601 Glass-pool, gas-cycle nuclear power plant  
A nuclear power plant that is of a walk-away type with an encapsulated reaction core in a glass matrix pool having a reactive Thorium/U 233 composition in a containment structure that radiates...
5032349 Shutdown of a high temperature reactor  
A process is provided for the long term shutdown of a high temperature nuclear reactor comprised of a pile of spherical fuel elements in a core by means of a neutron absorbing absorber material...
5028378 Safety system for a gas cooled high temperature reactor  
A safety system controlling extremely unlikely disturbances in high temperature reactors in addition to and independent of the normal reactor protection systems. Accident instrumentation located in...
5019322 Gas cooled nuclear reactor with a pebble bed of spherical operating elements  
A gas cooled nuclear reactor may have a stationary pile of spherical operating elements. The reactor may be controlled and shut down by absorber rods displaceable in channels of the side reflector....
4976913 Nuclear energy system using pelletized fuel in a boiling liquid reactor  
An energy producing system employing nuclear fission of fuel in pellets disposed in a boiling liquid to produce superheated vapors.
4923670 Roof reflector for a nuclear reactor  
A roof reflector comprising at least three individual layers of tapered layer elements combined in the form of vertical columns. Each column rests on a block column of the lateral reflector....
4911881 Spring packed particle bed fuel element  
A particle bed fuel element designed to accommodate expansion and contraction within the particle fuel bed. Porous inner and outer frits connected together by an end cap at a first end and radially...
4863676 Inherently safe, modular, high-temperature gas-cooled reactor system  
In a high-temperature gas-cooled nuclear reactor system, which is suitable for modular utilization in combination with one or more other similar nuclear reactor systems, an arrangement which...
4830818 Ceramic installations  
A gas-cooled high temperature reactor having a core filled with spherical fuel elements is provided comprising a graphite side reflector including at least one nose-like projection comprised of a...
4826652 Low capacity nuclear reactor housed underground in the cavity of a cylindrical pressure vessel  
A low capacity nuclear reactor with spherical fuel elements laid out in an underground configuration and characterized by a compact structure and the far-reaching elimination of active operating...
4816212 Graphite side reflector  
A high temperature reactor having a reactor core filled with spherical fuel elements is provided comprising a graphite side reflector including at least one nose-like projection protruding radially...
4808370 Connection of a hot gas line to the core barrel of a gas-cooled high-temperature nuclear reactor  
A gas-cooled, high-temperature nuclear reactor includes a metallic core barrel, a graphite or carbon block lining disposed in the core barrel, a hot gas line including an outer pressure-confining...
4789519 Nuclear reactor plant  
In a nuclear reactor installation with a small high temperature reactor (26) all of the components of the primary loop, together with the control and shutdown installations (82, 92, 114, 116; 194,...
4788031 Concrete reactor pressure vessel for a gas cooled nuclear reactor of low capacity  
A concrete reactor pressure vessel for a low capacity, gas cooled nuclear reactor is provided. To assure the safe containment of the cooling gas in an economical manner and to remove the heat...
4778646 Gas cooled high temperature reactor charged with spherical fuel elements  
The invention relates to a gas cooled high temperature reactor located in the cavity of a pressure vessel, with spherical fuel elements, and removal apparatus for fuel elements. The latter is made...
4777012 Gas cooled high temperature reactor charged with spherical fuel elements  
A gas cooled high temperature reactor with spherical fuel elements surrounded by a reflector utilizes at least one ceramic tube and at least one metal tube for removal of pebbles from the core of...
4761260 Nuclear power plant with a high temperature reactor located in a cylindrical prestressed concrete pressure vessel  
A nuclear power plant (heating plant) with a helium cooled high temperature reactor with spherical fuel elements, located in a cylindrical prestressed concrete pressure vessel, suitable for...
4756873 Single loop nuclear power plant for current generation with a helium cooled high temperature reactor  
A single loop nuclear power plant with a helium cooled high temperature reactor for generation of electric current, designed for a capacity of 1-5 MWe. The plant, which in addition to the high...
4743424 Nuclear reactor installation  
A nuclear reactor installation with a high temperture, gas cooled nuclear reactor supported in a cavity on a segmented bottom plate held by a centered point of fixation. The first heat exchangers...
4728492 Roof reflector for a small high temperature reactor  
A roof reflector for a small, high temperature reactor with a hot gas collector space arranged above the roof reflector comprises a side reflector arranged under the roof reflector around a reactor...
4698203 Gas-cooled nuclear reactor with a bed of spherical fuel elements  
Gas-cooled nuclear reactors include circulation systems for cooling gas to remove the heat generated in the reactor core. An improved arrangement includes a plurality of steam generators in a...
4695423 Method for loading, operating, and unloading a ball-bed nuclear reactor  
A ball-bed (pebble-bed) nuclear reactor, instead of having fuel elements e or less continuously withdrawn and new or reconstituted fuel elements more or less continuously reintroducted, is...
4692301 Steam generator heated with the cooling gas of a nuclear reactor  
The invention concerns a steam generator heated by the cooling gas of a nuclear reactor and arranged in the reactor pressure vessel within a vertical shaft. A blower associated with the steam...
4689194 Nuclear reactor plant with a small high temperature reactor operating with spherical fuel elements  
A nuclear reactor plant with a small high temperature reactor, principal heat exchangers located above the small high temperature reactor and housed in a steel pressure vessel, and a plurality of...
4675155 Roof reflector for a high temperature small reactor  
A graphite roof reflector for a small, high temperature reactor is arranged under the hot gas collector space and is therefore exposed to high thermal and radiation loads. In order to make possible...
4664871 Nuclear power installation with a high temperature pebble bed reactor  
Disclosed is a nuclear power plant comprising a high-temperature pebble bed reactor contained in a cylindrical steel pressure vessel in which an upper part of the cylindrical steel pressure vessel,...
4661311 Nuclear power plant arranged in an underground cavity with a small high-temperature pebble bed reactor  
The invention concerns a nuclear power plant located in an underground cavity, with a small high-temperature reactor which, together with a heat exchanger apparatus, is housed in a steel reactor...
4657732 High temperature reactor with spherical fuel elements  
A barrier system for a high temperature reactor. The reactor utilizes spherical fuel elements consisting of coated particles of a fissionable material embedded in a graphite matrix, the coating...
4654189 Operating element charging and withdrawal in a gas cooled high temperature reactor  
A medium power, high temperature pebble bed nuclear reactor, which includes a means for introduction and withdrawal of operating elements. The installation is provided in such a way that it can be...
Matches 1 - 50 out of 107 1 2 3 >