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062326139 | abstract | An angular pumped and emitting capillary(APEC) discharge light source having a blocking electrode installed on the axis of the capillary just beyond the end of the capillary bore. Thus, the emitting region occurs in an angular fashion between the end of the capillary and the blocking electrode. The blocking electrode p... |
059600497 | abstract | The operator of a nuclear steam supply system manually selects a lineup of either one, two, or three main feedwater pumps for normal reactor operation to generate power. This selection sets or resets a status latch for each pump, representative of intended pump operation. A system (RPCS) for implementing a step reducti... |
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053393465 | description | DEFINITIONS Plasma Source--A thermally-produced plasma for yielding x-ray radiation--generally pumped by a high power pulsed laser. PA0 Illumination Radiation--The delineating radiation as incident on and producing an PA0 Illumination Field on the mask, characterized by intensity, direction, divergence and spectral wid... |
abstract | A modular nuclear reactor comprises a plurality of sections arranged in a pattern and a side reflector material surrounding the plurality of sections. Each section includes a tank comprising a front plate, a back plate, side plates, a top plate, and a bottom plate. A plurality of grid plates are located within the tank... | |
claims | 1. An optical axis adjusting mechanism for an X-ray lens to be implemented in an X-ray analytical instrument, comprising:an exit side adjusting mechanism for adjusting an exit side focal point of the X-ray lens to focus on an X-ray detector; andan entrance side adjusting mechanism for adjusting an entrance side focal p... | |
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042499950 | abstract | In a fast reactor constituted by an open-topped main vessel containing liquid metal coolant and an inner vessel mounted within the main vessel, a transverse skew wall forming an inner vessel extension is associated with a baffle which extends above the skew wall. A space formed between the baffle and the skew wall and ... |
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description | Calibration devices for optical scanners and methods for their use are provided. The subject devices are characterized by having a polymeric coating with at least one fluorescent agent, where the devices have minimal local and global nonuniformities. The subject device may also include one or more photobleached regions... | |
051606950 | abstract | An apparatus and method of enhancing nuclear fusion reactions utilizes a plasma, made up of ions and electrons, contained within a region, and enhances the density of the plasma using a collision-diffusion compressional enhancement process. Ion acoustic waves generated within a central region of the system permit incre... |
claims | 1. A control rod drive mechanism (CRDM) comprising:a hollow lead screw;a lifting rod having an upper end disposed in the hollow lead screw;latches secured to the lead screw and configured to latch the upper end of the lifting rod to the lead screw;a latch engagement mechanism configured to close the latches onto the up... | |
048851221 | description | DETAILED DESCRIPTION Referring now to FIGS. 3 and 4, one embodiment of the clamping apparatus of the present invention is shown in plan and cross sectional views respectively. The clamping apparatus, generally designated as 30, comprises two end body members 31. Each of the end body members has an unflanged end 31U and... |
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051630788 | description | DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In accordance with the embodiments shown in the drawings, the present invention will be described in detail below. FIRST EMBODIMENT In this embodiment, where the multilayer film reflecting mirrors each comprised of Ni and Sc (the number of layers: 201, an X-ray waveleng... |
description | The present invention relates to a method for determining the value of a parameter representative of the operability of a nuclear reactor. The invention is used, for example, in pressurised water reactors. In conventional manner, the core of such a reactor is charged with nuclear fuel assemblies. Each assembly comprise... | |
040299686 | description | DESCRIPTION OF THE PREFERRED EMBODIMENT Illustrated in FIGS. 1 and 2 is a rack 10 for storing spent nuclear fuel elements in a boiling water reactor nuclear power plant. The rack 10 has been generally disclosed in an application filed by Herbert J. Rubinstein, Philip M. Clark and James D. Gilcrest on July 11, 1975, Ser... |
044477333 | claims | 1. A radiation-shielding transport and storage container for radioactive material, said container comprising: a radiation shielding vessel composed of cast iron or cast steel and defining a storage chamber for said radioactive material and a mouth opening into said chamber and formed with a plurality of seats; a plug-... |
043702961 | claims | 1. A compact toroidal fusion reactor for producing energy from fusion reactions having a plasma containing toroidal fusion region and having a main axis, comprising: (a) a toroidal field generating means for producing a toroidal magnetic field in said fusion region upon the passage of current therethrough, said toroida... |
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abstract | A method and system for the thermoelectric conversion of nuclear reactor generated heat including upon a nuclear reactor system shutdown event, thermoelectrically converting nuclear reactor generated heat to electrical energy and supplying the electrical energy to a mechanical pump of the nuclear reactor system. | |
047605898 | description | DETAILED DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates a grid cabinet 1 with an X-ray film cassette tray 2, also known as a cassette holder, which slides in and out of the cabinet 1. The tray 2 does not separate completely from the cabinet 1, but slides out only to the position shown in FIG. 1 to allow for easy insert... |
056132433 | claims | 1. A process for stabilization of radionuclides derived from naturally occurring mineral sources, the process comprising the steps of: (i) forming a substantially barium-free composition comprising a radionuclide and sufficient stabilizing component to ensure that when the composition is roasted, a crystalline phase is... |
056132395 | summary | BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a method and apparatus for decomposing an organic solution composed of a chelating solution and/or an organic acid containing radioactive metal ions, and further to a method and apparatus for collecting radioactive metals using the same, wh... |
052672867 | abstract | A fuel assembly having a water cross or water rod arranged between the fuel rods, an inside of the water cross or water rod being divided into a coolant rising passage and a coolant lowering passage, and a control guide tube disposed inside the water cross or water rod and extending along an axial direction of the wate... |
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abstract | Provided is a method that can remove fission products in a spent electrolyte produced in a dry reprocessing process by an easy operation and can vitrify the fission products easily, the fission products including not only the fission products that generate precipitate but also the fission products that generate no prec... | |
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claims | 1. An inspection apparatus, comprising:a feed-in preparation chamber;an imaging chamber; anda feed-out preparation chamber, whereineach of the feed-in preparation chamber and the feed-out preparation chamber comprises:a feed-in conveyor configured to receive an inspection object through a first opening,a traverser conf... | |
047160071 | abstract | A mechanical spectral shift reactor comprises apparatus for inserting and withdrawing water displacer elements having differing neutron absorbing capabilities for selectively changing the water-moderator volume in the core thereby changing the reactivity of the core. The displacer elements may comprise substantially ho... |
abstract | A scattered radiation grid for absorbing secondary radiation scattered by an object comprises a support, and a plurality of spaced-apart absorbing elements affixed to the support. The plurality of absorbing elements comprises relatively small tubes or pins affixed to the support via plug-in or clamping fixtures. | |
050531875 | description | Referring now to the figures of the drawings in detail and first, particularly, to FIG. 1 thereof, there is seen a partial region of a core structure 1 of a water-cooled nuclear reactor plant. The core structure receives a core shroud or barrel 2, the periphery of which is matched to a composite structure of non-illust... |
claims | 1. A device for measuring radiation comprising:a radiation detector configured to generate an analog signal containing pulse components corresponding to a dosage of an inputted radiation;an n-th moment calculation unit configured to calculate an average value of the n-th power values of pulse heights within a time widt... | |
claims | 1. A system for closing a drum unit for storing radioactive waste, the system comprising:a supporting unit configured to be seated on the ground;a drum unit configured to be seated on a top part of the supporting unit and having a plurality of first fastening holes formed along an outer circumferential surface of a top... | |
047643404 | claims | 1. A nuclear fuel assembly comprising: (a) a first material first nozzle having a bearing surface disposed thereon; (b) a second material channel having said first nozzle disposed thereon; (c) a second material attachment device connected to the channel; and (d) a stress relieving fastener disposed on the attachment... |
description | This application is the U.S. national stage application of International Application PCT/FI2018/050282, filed Apr. 20, 2018, which international application was published on Oct. 24, 2019, as International Publication WO 2019/202198 A1 in the English language. The invention relates to the technical field of X-ray fluo... | |
041750004 | summary | BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to nuclear equipment and more particularly to methods and apparatus for the non-destructive inspection, manipulation, disassembly and assembly of reactor fuel elements, and the like. 2. Description of the Prior Art To generate power in a nucle... |
abstract | 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 wedge and the spider. At least one spring washer is located between the end of the thermal sleeve and the end of a core spr... | |
046541896 | description | SPECIFIC DESCRIPTION The entire reactor installation is shown in FIGS. 1, 2, and 3. FIG. 1 shows the prestressed concrete pressure vessel 1 with a ceiling 1a and a bottom 1b. This prestressed concrete pressure vessel, also referred to as prestressed concrete reactor vessel in the art, is supported on foundation walls 2... |
058624945 | description | DETAILED DESCRIPTION OF THE INVENTION The encapsulating material used in the hazardous waste treatment systems of the present invention includes polyacrylic acids and all salts thereof. The encapsulates are typically utilized in powder or granular form. When added to a moisture bearing waste product, the encapsulates r... |
abstract | A method, system, and apparatus are disclosed for a complex shape structure for liquid lithium first walls of fusion power reactor environments. In particular, the method involves installing at least one tile on the surface area of the internal walls of the reactor chamber. The tile(s) is manufactured from a high-tempe... | |
abstract | A multileaf collimator includes a first leaf block group including plural leaf blocks, a second leaf block group including plural leaf blocks arranged in the same direction as the first leaf block group and disposed opposite the leaf blocks of the first leaf block group, plural magnetic layers located on the respective... | |
description | The present invention relates to a single particle film etching mask which is preferably used for production of a micro structure (an antireflection, an original plate of mold for a nano imprint) and its production method, a micro structure which is obtained by the production method and a production method of a micro ... | |
061047724 | claims | 1. In a method for introducing a self-propelled in-pipe manipulator into a pipeline having an opening and branching off from a nuclear steam generator, the improvement which comprises: providing a hollow body having at least one open end; positioning the in-pipe manipulator in the hollow body; positioning the hollow ... |
abstract | Nuclear fuel structures and methods for fabricating are disclosed herein. The nuclear fuel structure includes a plurality of fibers arranged in the structure and a multilayer fuel region within at least one fiber of the plurality of fibers. The multilayer fuel region includes an inner layer region made of a nuclear fue... | |
description | This invention relates to a device for transferring powder or mixtures of powder offering improved flow. In this application, the term “powder” means a granular medium comprised of granular particles having a diameter between 1 nm and several dozen centimeters. In the nuclear field, the manufacture of nuclear fuel in ... | |
claims | 1. A bottom end-piece of a support skeleton for a fuel assembly of a light water nuclear reactor, the bottom end-piece comprising:direction nozzles directing the flow of water of the reactor along the lower longitudinal ends of fuel rods supported by the skeleton, the direction nozzles being arranged at nodes of a subs... | |
abstract | In a complex, multi-processor software controlled system, such as proton beam therapy system (PBTS), it may be important to provide treatment configurable parameters that are easily modified by an authorized user to prepare the software controlled systems for various modes of operation. This particular invention relate... | |
claims | 1. An EUV light source for generating an EUV light for an exposure device, the EUV light source comprising:a chamber;a target supply device configured for supplying a target into the chamber;an optical system for introducing laser light from a driver laser into the chamber and irradiating the target with the laser ligh... | |
052981967 | claims | 1. An apparatus for holding and laterally enclosing an object during transporting to and from a furnace and heating in said furnace, said object occupying a smaller volume after being heated than before being heated, said apparatus comprising: a crucible having an internal volume at least equal to the volume of said ob... |
abstract | The invention relates to an underwater electricity generation module provided with a base. The electricity generation module is of the type that comprises an elongate cylindrical casing (12) incorporating an electricity generation unit (25a, 25b) comprising a nuclear boiler (28, 29) associated with electricity generati... | |
description | This application is a continuation-in-part of U.S. patent application Ser. No. 15/167,617 filed May 27, 2016, which is: a continuation-in-part of U.S. patent application Ser. No. 15/152,479 filed May 11, 2016, which: is a continuation-in-part of U.S. patent application Ser. No. 14/216... | |
claims | 1. An electron beam system, comprising:an electron gun for generating an electron beam;an electron beam column;a deflector for deflecting the electron beam;an anti-fogging baffle arrangement having a main baffle portion having a center opening allowing the electron beam to pass and positioned to collect scattered elect... | |
abstract | An apparatus for cooling a spent fuel pool having a heat exchanger includes a cooling water pool positioned above the spent fuel pool; a floating device configured to be elevated according to a water level of a cooling water in the spent fuel pool; and an emergency cooling water supply pipe configured to form a path th... | |
description | This application is a Divisional application of, and claims the benefit of, U.S. patent application Ser. No. 13/306,643, filed Nov. 29, 2011, which is hereby incorporated by reference in its entirety. U.S. patent application Ser. No. 13/306,643 is a Continuation-In-Part application of, and claims the benefit of, U.S. ... | |
abstract | Disclosed is an apparatus for performing an automated cleaning of nuclear fuel cladding-tubes. The apparatus comprises a pre-cleaning holding section disposed at a first side of the apparatus, a primary cleaning-material supplying section and a primary cleaning section disposed at a second side of the apparatus, a seco... | |
046684646 | claims | 1. A method of maintaining three-dimensional MHD equilibrium of a plasma contained in a helical axis stellarator said stellarator having a set of primary coils, said method comprising the steps of: providing a current through a resonant coil system about said stellarator, said resonant coil system having a configuratio... |
description | 1. Field of the Invention The present invention relates generally to nuclear reactors, and more particularly, to any nuclear reactor having a fuel assembly with an improved grid. 2. Description of the Related Art In most water cooled nuclear reactors, the reactor core is comprised of a large number of elongated fuel a... | |
description | This application is a divisional application of U.S. patent application Ser. No. 11/633,233, filed on Dec. 4, 2006, which claims priority to U.S. Provisional Pat. App. No. 60/748,541, filed on Dec. 8, 2005. U.S. patent application Ser. No. 11/633,233 and U.S. Provisional Pat. App. No. 60/748,541 are incorporated herei... | |
047740485 | abstract | A modular tokamak system comprised of a plurality of interlocking moldules. Each module is comprised of a vacuum vessel section, a toroidal field coil, moldular saddle coils which generate a poloidal magnetic field and ohmic heating coils. |
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051685132 | claims | 1. Apparatus for detection of alignment of an x-ray lithography system including an x-ray mask and a work piece with an alignment mark, comprising: a) an x-ray beam, means on said x-ray mask for focussing said x-ray beam on said work piece, b) (1) means for directing x-rays through said means for focussing at said ali... |
059636106 | summary | BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to the field of diagnostic techniques for nuclear reactor subsystems in a nuclear steam supply system. More particularly, the present invention is directed to a control element drive mechanism (CEDM) in such nuclear power plan... |
046474200 | abstract | Systems and methods for inspection of nuclear fuel pins to determine fiss loading and uniformity. The system includes infeed mechanisms which stockpile, identify and install nuclear fuel pins into an irradiator. The irradiator provides extended activation times using an approximately cylindrical arrangement of numerous... |
H00004464 | description | DETAILED DESCRIPTION OF THE INVENTION The effects of polarizing the various constituents of the four hydrogen isotope reactions will be discussed below. EQU D+T.fwdarw.He.sup.4 +n (3) In the case of a magnetic D-T reactor the fractions of D nuclei polarized parallel, transverse, and antiparallel to the plasma confining... |
060410914 | description | DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the invention will be described hereunder with reference to the accompanying drawings. For the same members or elements as those described above regarding the conventional art are assigned with the same reference numerals and detailed description thereof is omitte... |
summary | ||
062352237 | abstract | A sintered nuclear fuel body includes (U, Pu)O.sub.2 mixed crystals having a mean particle size in a range from 7.5 .mu.m to 50 .mu.m. This sintered nuclear fuel body has a high retention capacity for fission gas in a power reactor. In order to produce the sintered nuclear fuel body by sintering a body in a hydrogen-co... |
description | A preferred embodiment of the present invention will now be explained in detail with reference to the accompanying drawings. FIG. 1A is a perspective view showing a scattered ray removal grid that is an embodiment of the present invention, and FIG. 1B is a side view of the same. As shown in these figures, a scattered r... | |
062513109 | summary | BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a method of manufacturing UO.sub.2 -based fuel pellets by recycling irradiated UO.sub.2 -based fuel pellets. More particularly this invention relates to a method of making U.sub.3 O.sub.8 -based powder from irradiated UO.sub.2 -based fuel p... |
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050330756 | abstract | In accordance with the present invention, there is provided an X-ray filter which significantly reduces low energy radiation normally absorbed by the examination object without significantly affecting the desired high energy radiation. The filter is comprised of one or more materials containing as the major component e... |
052290654 | abstract | Coolant fluid is sampled from a substantially horizontal part of the hot leg (16) of the primary circuit at at least three points (19, 20, 21) distributed at the periphery of a straight section of the hot leg (16), in such a way that at least one of the sampling points, or lower sampling point, is situated beneath the ... |
055486258 | description | DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT The present invention addresses the problem of long cycle time due to single field x-ray lithographic processing by providing a method in which multiple fields can be imaged simultaneously in x-ray lithography, hence reducing overall cycle time by decreasing the number of ... |
abstract | This disclosure provides systems, methods, and apparatus related to beam stops. In one aspect, a device comprises a luminescent material, a beam stop plate, and an optical fiber. The luminescent material is a parallelepiped having a first side and a second side that are squares and having a third side that is a rectang... | |
053612868 | abstract | A method for cleaning inlet mixers while they remain in their operating position within a nuclear reactor. A water-powered cleaning tool is inserted by remote control into the inlet mixer via a secondary inlet opening. Following insertion of the cleaning tool, the internal surfaces of the inlet mixer are cleaned with a... |
047553529 | description | DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a prototype 2 MWt Slowpoke -3 heating reactor which was described in the above mentioned article presented at the IAEA Technical Committee on Dec. 5-9, 1983. In the figure, a core 1 consists of an anassembly of 193 Zircaloy [Trademark] clad UO.sub.2 fuel el... |
056231091 | claims | 1. A method of monitoring and diagnosing plant conditions comprising the steps of: detecting and accumulating plant operating conditions, apparatus operating conditions and environment conditions; inputting and accumulating plant inspection data; and monitoring and diagnosing said plant conditions based on plant reco... |
description | The present application claims the benefit of U.S. Provisional Patent Application Ser. No. 61/175,899, filed May 6, 2009, the entirety of which is hereby incorporated by reference. The present invention relates generally to apparatus, systems and methods for storing and/or transporting high level radioactive waste, an... | |
claims | 1. A method of extending a life expectancy of a high-temperature piping, comprising:when it is determined that a continued stationary use cannot be performed by a remaining life expectancy evaluation of a creep rupture of a welded portion of the high-temperature piping,peeling off a part of a heat insulation material f... | |
041359712 | claims | 1. In a nuclear reactor having a pressure vessel and a core within the pressure vessel, said core comprised of a plurality of fuel assemblies each comprised of a plurality of vertically oriented fuel elements, the reactor having fluid under pressure passed upwardly over said fuel elements; the improvement comprising: a... |
055419690 | claims | 1. In a pressurized water nuclear power plant, a water level monitor responsive to the water level in a reactor vessel that is fluidly connected to a steam generator, comprising: a main pipe for delivering heated water from said reactor vessel to said steam generator during normal plant operation, said main pipe includ... |
description | The invention relates to a phase plate for use in a particle-optical apparatus, said phase plate to be irradiated by a beam of particles, said phase plate comprising a central structure that is non-transparent to particles, said central structure surrounding a through-hole for passing a part of the beam, said central ... | |
043371183 | claims | 1. In a nuclear reactor having a core including means for recirculating a coolant through the core to make a core coolant flow, means associated with said recirculating means for controlling the core coolant flow rate, means for detecting the power level of the reactor and producing a signal indicative of the detected ... |
summary | ||
050287966 | description | DETAILED DESCRIPTION OF THE INVENTION FIG. 1 is a schematic view of the inner face of a support belt constructed in accordance with this invention. Portions of the belt as shown are depicted in partial cut-away or peeled-back configuration to reveal the internal structure. Support belt 10 as shown in FIG. 1 includes an... |
description | 1. Field of the Invention This invention pertains in general to the inspection of boiling water reactor internals and more particularly to the inspection of the underside of a top guide for a boiling water reactor. 2. Related Art FIG. 1 is a sectional view, with parts cut away, of a typical reactor pressure vessel 10 ... | |
description | This application is related to Provisional Patent Application Ser. No. 61/279,486, filed Oct. 22, 2009 and claims priority thereto. 1. Field of the Invention This invention relates in general to the field of pressurized light water nuclear reactors and, in particular, to radial neutron reflectors which surround the nu... | |
047939664 | summary | BACKGROUND OF THE INVENTION This invention relates to nuclear reactors and has particular relationship to reactors in which a coolant, typically water at critical temperature and pressure, is circulated through the nuclear core. The core includes the fuel and is disposed in the lower region of the reactor vessel. In ad... |
claims | 1. A battery comprising:a membrane material capable of collecting alpha particles;a first plate;a radioisotope material positioned between the membrane material and the first plate;a second plate;a rechargeable electro chemical cell positioned between the second plate and the first plate;a housing accommodating the rad... | |
claims | 1. A method for x-ray tomosynthesis or limited-angle CT of a subject or part of a subject, comprising:during imaging, moving a detector tray supporting a detector having a non-circular shape by rotating the detector tray, the detector comprising a plurality of detector cells, a greater density of the detector cells pos... | |
claims | 1. An improvement to measurement methods that have steps of trapping an ensemble of atoms and measuring interference fringes between populations of internal states of a quantum system based on interaction of the ensemble of atoms with a plurality of counterpropagating optical beam pairs, the improvement comprising:a. c... | |
claims | 1. A method of using a gas cluster ion beam to offset systematic non-uniformities in workpieces processed in a process tool, the method comprising:processing a plurality of first workpieces in the process tool;collecting parametric data from the first workpieces;identifying systematic non-uniformities in the collected ... | |
056152388 | abstract | A radioisotope production target and a method for fabricating a radioisotope production target is provided, wherein the target comprises an inner cylinder, a foil of fissionable material circumferentially contacting the outer surface of the inner cylinder, and an outer hollow cylinder adapted to receive the substantial... |
041479386 | claims | 1. A fire resistant cask for transportation and storage of radioactive material comprising: an inner container for containing said radioactive material, a layer of gamma and neutron radiation shielding materials surrounding said inner container, an outer container surrounding said layer and inner container, a plurality... |
044877412 | summary | BACKGROUND OF THE INVENTION This invention relates to the art of nuclear reactor power plants and has particular relationship to the transfer of fuel assemblies to and from nuclear reactors during fueling, refueling and the like. While this invention is uniquely applicable to nuclear reactors, it is realized that the i... |
abstract | 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. | |
abstract | A fuel channel for housing a fuel rod bundle in a boiling water nuclear reactor includes an expanded section to create an increased flow area at a top of the fuel channel and thereby reduce a pressure drop through the fuel channel. The expanded section eliminates a need for channel spacers and a fastener guard. |
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