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Class 376/305 - Corrosion or damage prevention


Subclass of Class 376 - Induced nuclear reactions: processes, systems, and elements
Definition: Subject matter wherein the undesired effect is the chemical
No. of patents: 202
Last issue date: 05/08/2012


1            
NumberTitleIssue Date
8175211Method of stress corrosion cracking mitigation for nuclear power plant structural materials
The object of this invention is to provide a method for mitigating a stress corrosion cracking of reactor structural material which makes it possible to suppress the rise in the main steam line dose rate without secondary effects such as a rise in the concentration ...
05/08/2012
8149983Method for analysis of pellet-cladding interaction
A method is provided for evaluating pellet-cladding interaction (PCI) in a nuclear core having a reactor protection system and a plurality of elongated fuel rods each having fuel surrounded by cladding with a gap therebetween. The method includes: selecting a number...
04/03/2012
8054933Chemical injection system and chemical delivery process/method of injecting into an operating power reactor
An injection system designed to deliver a chemical solution into a reactor through feedwater system taps during normal operating condition of a power reactor is disclosed. The process of delivery is via positive displacement pumps. Injection of chemical is in a conc...
11/08/2011
8023609Dielectric coating for surfaces exposed to high temperature water
Disclosed is a method for reducing electrostatic deposition of charged particles on wetted surfaces that are exposed, periodically or substantially continuously to high velocity fluid flow within a coolant flow path in a nuclear reactor. The method includes depositi...
09/20/2011
7889828Suppression method of radionuclide deposition on reactor component of nuclear power plant and ferrite film formation apparatus
A method of suppressing deposition of radionuclides on components of a nuclear power plant comprises forming a ferrite film by contacting a first chemical including iron (II) ions, a second chemical for oxidizing the iron (II) ions to iron (III) ions, and a third ch...
02/15/2011
7869557Method of stress corrosion cracking mitigating for nuclear power plant structural materials
The object of this invention is to provide a method for mitigating a stress corrosion cracking of reactor structural material which makes it possible to suppress the rise in the main steam line dose rate without secondary effects such as a rise in the concentration ...
01/11/2011
7864914Method of stress corrosion cracking mitigation for nuclear power plant structural materials
The object of this invention is to provide a method for mitigating a stress corrosion cracking of reactor structural material which makes it possible to suppress the rise in the main steam line dose rate without secondary effects such as a rise in the concentration ...
01/04/2011
7844024Suppression method of radionuclide deposition on reactor component of nuclear power plant and ferrite film formation apparatus
A method of suppressing deposition of radionuclides on components of a nuclear power plant comprises forming a ferrite film by contacting a first chemical including iron (II) ions, a second chemical for oxidizing the iron (II) ions to iron (III) ions, and a third ch...
11/30/2010
7782994Inhibitor of lead-induced stress corrosion cracking comprising nickel boride in secondary side of steam generator tubes in nuclear power plants and inhibition method using the same
This invention relates to an inhibitor of lead-induced stress corrosion cracking including nickel boride in the secondary side of steam generator tubes in nuclear power plants and an inhibition method using the same, and more particularly, to an inhibitor of lead-in...
08/24/2010
7389669Mechanical stress improvement process
A process for reducing residual tensile stresses in high nickel-chromium alloy nozzle safe-end welds of pressurized water reactor nuclear pressure vessels such as are found at the reactor vessel inlet and outlet nozzles and the pressurizes surge, spray, safety and r...
06/24/2008
7346140Reactor structural member and method of suppressing corrosion of the same
A photocatalytic substance having the properties of an n-type semiconductor is deposited on a surface of a metal base made of a stainless steel or Inconel. When necessary, the hydrogen concentration of the reactor water is increased. A current produced by the photoc...
03/18/2008
7342218Methods and systems for optical inspection of surfaces based on laser screening
A method for imaging and an imaging system, the system includes the steps of: (i) scanning a beam of coherent radiation over a surface along a scan axis; (ii) focusing the beam to a spot on the surface, so that the spot has a predetermined dimension along the scan a...
03/11/2008
7338917Purification catalyst for exhaust gas
A purification catalyst for exhaust gas enhances the activity for each precious metal by effectively utilizing the precious metal without incurring a high production cost, thereby improving endurance. The purification catalyst for exhaust gas comprises a composite o...
03/04/2008
7317321Methods and systems for automated pipeline testing
A method for testing effectiveness of a cathodic protection device configured to apply at least one voltage across an underground structure and a reference point is described. The method includes providing a sample of the material from which the underground structur...
01/08/2008
7280946Method and arrangement for determining pin enrichments in fuel bundle of nuclear reactor
A method and arrangement of determining pin enrichments for a fuel bundle of a nuclear reactor, where a plurality of input parameters and target conditions may be input and enrichment changes, to be made across the fuel bundle, may be calculated using response matri...
10/09/2007
7264770Mitigation of stress corrosion cracking of structural materials exposed to a high temperature water
A method for mitigating stress corrosion cracking of a component exposed to a high temperature water in a high temperature water system is provided. The method comprises the steps of lowering corrosion potential conditions to a desired low corrosion potential in the...
09/04/2007
7233888Monte Carlo criticality-mode systems and methods for computing neutron and gamma fluence in a nuclear reactor
A method for simulating three-dimensional spatial distribution of neutron and gamma fluences in a nuclear reactor includes, in an exemplary embodiment, generating a detailed geometric configuration of a nuclear reactor core and surrounding components, generating det...
06/19/2007
7232611Component including a zirconium alloy, a method for producing said component, and a nuclear plant including said component
The present invention relates to a component (1) comprising an element (2), which contains zirconium or a zirconium alloy and which has a surface (3) on which a corrosion protective layer (4) is formed, the oxide layer (4) comprisi...
06/19/2007
7206372Methods of repairing leaking elongate hollow members in boiling water reactors
In a method for sealing a hollow, elongate member within a reactor pressure vessel of a nuclear reactor, a section of the elongate member may be removed to separate the elongate member into an upper portion and a lower portion with an opening there between. The lowe...
04/17/2007
7159737Internally cooled pressure containment apparatus
A pressure containment apparatus includes a shell having a top end and a bottom end forming a pressure chamber. The pressure containment apparatus also includes a liner having an outside diameter larger than an inside diameter of the shell, wherein the liner is remo...
01/09/2007
7157114Platinum coating process
A process for depositing pure platinum on a substrate is disclosed. In accordance with one embodiment, the process comprises applying a solution consisting of Pt(acetylacetonate)2 and ethanol or acetone onto a substrate and wrapping at least a portion of ...
01/02/2007
7031779Method and apparatus for automated crack behavior prediction determination
A method of predicting component crack behavior in a nuclear reactor provides access to a crack growth behavior model over a global network. A user inputs water chemistry and material characteristics of a particular nuclear reactor and can perform crack growth rate ...
04/18/2006
7027549Nuclear power plant system and method of operating the same
Migration of radioactive materials from a pressure vessel to a steam system in a nuclear power plant is suppressed by using a dryer (3) provided with corrugated plates (22) having surfaces coated with an inorganic ion-exchange material stable under a c...
04/11/2006
7023949Jet pump assembly repair method
A BWR jet pump assembly has a wedge slidably mounted on a jet pump that is movable under the force of gravity to seat between a bracket and the jet pump in order to horizontally support the jet pump against vibrations. The wedge or the bracket is repaired in situ by...
04/04/2006
7013224Method and apparatus to perform crack estimations for nuclear reactor
The method includes receiving parameters input by a user and calculating crack behavior estimations based on the received parameters by using a plurality of accessible crack behavior models. The crack behavior estimations calculated from each of the models are displ...
03/14/2006
7005404Substrates with small particle size metal oxide and noble metal catalyst coatings and thermal spraying methods for producing the same
A substrate having a catalytic surface thereon characterized as a coating of metal oxide and noble metal particles in the nominal diameter size distribution range of
02/28/2006
6968028Nuclear power station having a gas-injection device for a coolant
A nuclear power station includes a feedwater/steam circuit having a condensate-purification device and a feedwater pump connected upstream of a reactor pressure vessel. A branch line has a gas-injection device for introducing hydrogen into a coolant to ensure especi...
11/22/2005
6940939Reactor structural member and method of suppressing corrosion of the same
A photocatalytic substance having the properties of an n-type semiconductor is deposited on a surface of a metal base made of a stainless steel or Inconel. When necessary, the hydrogen concentration of the reactor water is increased. A current produced by the photoc...
09/06/2005
6937686Iron control in BWR's with sacrificial electrodes
Method for controlling the level of iron in feedwater of a BWR wherein an iron-containing sacrificial electrode in placed contact with the feed water dissolution of the electrode is induced at a rate which provides a desired level of iron in the feedwater. ...
08/30/2005
6921515Apparatus for chemical decontamination
In a chemical decontamination apparatus, a catalyst decomposition column in an upstream side of an ion exchange resin column and a hydrogen peroxide injection apparatus in a further upstream side, reduce the amount of waste products caused by a chemical decontaminat...
07/26/2005
6914955Heat exchanger tube support structure
A support plate for retaining tube array spacing within a heat exchanger tube and shell structure. The support plate having a plurality of individual tube receiving apertures formed therein. Each aperture has at least three inwardly protruding members and bights are...
07/05/2005
6898259Process for reducing the corrosion of a component of a nuclear facility, and component of a nuclear facility
The corrosion of a component in a water-guiding loop of a nuclear facility is reduced. A protective layer is produced with a sol-gel process. Prior to the sol application, water that wettens the component is removed from the conduction system and the component is op...
05/24/2005
6891912Fuel assemblies in a reactor core and method of designing and arranging same
A reactor core (104) includes fuel assemblies (202) arranged in a loading pattern (1100) in response to corresponding power levels of the fuel assemblies (202). A crud deposition model (412) is used to predict crud deposition on th...
05/10/2005
6885721Inhibition method of stress corrosion cracking of nuclear steam generator tubes by lanthanum boride
The present invention relates to a method for inhibiting stress corrosion cracking occurring on steam generator tubes in the secondary side of nuclear power plants and an inhibitor therefor. The method comprises supplying lanthanum boride as an inhibitor for stress ...
04/26/2005
6873672Procedure and device for measuring resistance to hydriding of tubes and tubular claddings
The method involves measuring hydrogen permeation in the tubes by mass spectrometry, wherein the tube is inserted into a high or ultrahigh vacuum device in which a mass spectrometer and a total pressure gauge are located. H2 or H2 and inert gas...
03/29/2005
6856665Method for controlling water quality in nuclear reactor and nuclear power plant to which the method is applied
A method for controlling water quality in a nuclear reactor comprises a first and second steps. The first step is to make an amount of iron, which is carried into the nuclear reactor and corrosively eluted from structural material within the nuclear reactor into rea...
02/15/2005
6810100Method for treating power plant heater drain water
Oxygen is mixed with heater drain water of power plant which contains fine particles of iron oxides such that the concentration of the dissolved oxygen in the heater drain water after the mixing of oxygen is in a range from 1 μg/liter to 20 μg/liter. The obtained ...
10/26/2004
6793883Application of catalytic nanoparticles to high temperature water systems to reduce stress corrosion cracking
A method and system for reducing stress corrosion cracking in a hot water system, such as a nuclear reactor, by reducing the electrochemical corrosion potential of components exposed to high temperature water within the structure. The method includes the steps of: p...
09/21/2004
6714618Temperature-based method for controlling the amount of metal applied to metal oxide surfaces to reduce corrosion and stress corrosion cracking
Method for controlling the amount of metal atoms deposited into an oxide layer present on a metal surface, which metal atoms increase the corrosion resistance of metal when present in the oxide film, wherein the metal surface is submerged in water at a selected temp...
03/30/2004
6697449Temperature-based method for controlling the amount of metal applied to metal oxide surfaces to reduce corrosion and stress corrosion cracking
Method for controlling the amount of metal atoms deposited into an oxide layer present on a metal surface, which metal atoms increase the corrosion resistance of metal when present in the oxide film, wherein the metal surface is submerged in water at a se...
02/24/2004
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