By Addition Of Material To Coolant Patents (Class 376/306)
  • Patent number: 10697719
    Abstract: A recirculating cooling system includes a coolant sampling line, a deterministic lateral displacement (DLD) microfluidic separation device, a monitoring device, and an alert generation device. The coolant sampling line is in fluid communication with a recirculating coolant line, and the DLD microfluidic separation device receives a coolant sample diverted into the coolant sampling loop from the recirculating coolant line via the coolant sampling line. The DLD microfluidic separation device includes a separation array for separating bacteria into an output channel according to a size threshold. The monitoring device monitors a characteristic property of the coolant sampling loop for comparison to a threshold for bacterial growth in the recirculating cooling system. The alert generation device generates an alert to remediate the bacterial growth in the recirculating cooling system responsive to the characteristic property of the coolant sampling loop satisfying the threshold.
    Type: Grant
    Filed: August 9, 2018
    Date of Patent: June 30, 2020
    Assignee: International Business Machines Corporation
    Inventors: Jason T. Wertz, Joseph Kuczynski, Bradford O. Brooks, Donald W. Porter, Allan C. Vandeventer
  • Patent number: 10457583
    Abstract: The present disclosure provides a method for relieving a corrosive environment of a boiling water reactor, the method including a step of injecting hydrogen and a noble metal compound into water to be replenished into the reactor pressure vessel during a period of a generating operation of a boiling water nuclear power plant including the reactor pressure vessel. In the method, the hydrogen is injected into water to be supplied into the reactor pressure vessel, and the noble metal compound is injected into water in a line of the boiling water nuclear power plant in which a concentration of oxygen or hydrogen peroxide is stoichiometrically higher than the concentration of hydrogen at which hydrogen undergoes a chemical reaction to turn to water.
    Type: Grant
    Filed: January 30, 2017
    Date of Patent: October 29, 2019
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Kazushige Ishida, Youichi Wada, Masahiko Tachibana, Nobuyuki Oota, Ryosuke Shimizu, Mayu Sasaki
  • Patent number: 10453576
    Abstract: The present invention relates to a pre-core hot functional testing (HFT) preconditioning process, which includes the introduction of chemical additives, e.g., zinc, into coolant water that circulates through the primary system of a new nuclear power plant, at various temperatures. The chemical additives contact the primary system surfaces, which results in the formation of a protective zinc-containing oxide film on the fresh surfaces to control corrosion release and deposition during subsequent normal operation of the nuclear power plant. The method includes a series of three chemistry phases to optimize the passivation process: 1) an alkaline-reducing phase, 2) an acid-reducing phase and 3) an acid-oxidizing phase.
    Type: Grant
    Filed: July 29, 2015
    Date of Patent: October 22, 2019
    Assignee: Westinghouse Electric Company LLC
    Inventors: Rachel L. Devito, Jason P. Mazzoccoli, Edward J. Silva, Deborah J. Buckley, Richard J. Jacko, William A. Byers
  • Patent number: 10032531
    Abstract: A chemical solution injection system 30 of an embodiment includes: a chemical solution reservoir 31 that stores a chemical solution containing a depositing substance to deposit to a member in contact with cooling water for absorbing heat in a plant; a pipe 32 through which the chemical solution passes; a first heat exchanger and a second heat exchanger that exchange heat between the cooling water and the chemical solution; a cooling water pipe 49 which connects the heat exchangers in series and in which the cooling water passes; and a pump 34 that conveys the chemical solution. The temperature of the chemical solution in the chemical solution reservoir 31 is lower than that of the cooling water. The pipe 32 sequentially connects the chemical solution reservoir 31, the first heat exchanger, the second heat exchanger and the plant. The cooling water guided from the inside of the plant passes through the second heat exchanger and subsequently passes through the first heat exchanger.
    Type: Grant
    Filed: December 31, 2014
    Date of Patent: July 24, 2018
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Masato Okamura, Tetsuo Oosato, Seiji Yamamoto, Hiroyuki Arai, Osamu Shibasaki, Koji Negishi, Hiromichi Koga
  • Patent number: 9771482
    Abstract: The present invention provides a corrosion-resistant structure for a high-temperature water system comprising: a structural material 1; and a corrosion-resistant film 3 formed from a substance containing at least one of La and Y deposited on a surface in a side that comes in contact with a cooling water 4, of the structural material 1 which constitutes the high-temperature water system that passes a cooling water 4 of high temperature therein. Due to above construction, there can be provided the corrosion-resistant structure and a corrosion-preventing method capable of operating a plant without conducting a water chemistry control of cooling water by injecting chemicals.
    Type: Grant
    Filed: April 21, 2015
    Date of Patent: September 26, 2017
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Masato Okamura, Osamu Shibasaki, Koji Negishi, Seiji Yamamoto, Hajime Hirasawa, Kenji Yamazaki, Tetsuji Kaneko
  • Patent number: 9754689
    Abstract: A radiation source reducing system and method for nuclear power plants whereby radiation source can be reduced are provided. The radiation source reducing system for nuclear power plants includes a dispersant injecting unit, which injects a dispersant into a coolant of a nuclear power plant coolant system. The dispersant is polyacrylic acid, and has an average molecular weight in a range of 16000 to 26000, inclusive.
    Type: Grant
    Filed: March 25, 2013
    Date of Patent: September 5, 2017
    Assignee: THE JAPAN ATOMIC POWER COMPANY
    Inventors: Yutaka Ueyama, Wataru Sugino
  • Patent number: 9478319
    Abstract: A method of operating a power generator is provided. The method includes determining an amount of oxides on a heat transfer surface of the power generator as a function of a concentration of a noble metal substance in the oxides; and altering operation of the power generator when the amount of oxides on the heat transfer surface reaches a predetermined value. A method of operating a nuclear reactor is also provided.
    Type: Grant
    Filed: January 28, 2013
    Date of Patent: October 25, 2016
    Assignee: AREVA Inc.
    Inventors: Carola A. Gregorich, John M. Riddle, Mihai G. M. Pop
  • Patent number: 9443622
    Abstract: The present invention relates generally to a process for a pressurized water reactor. The pressurized water reactor includes a primary circuit and a reactor core. The process includes adding a sufficient amount of an organic compound to coolant water passing through the primary circuit of the pressurized water reactor. The organic compound includes elements of carbon and hydrogen for producing elemental carbon.
    Type: Grant
    Filed: June 20, 2012
    Date of Patent: September 13, 2016
    Assignee: Westinghouse Electric Company LLC
    Inventors: William Connor, Rachel DeVito
  • Patent number: 9443621
    Abstract: Example embodiments of the present invention relate to a method of adjusting an oxygen concentration of a reactor water side stream in a nuclear plant. The method may include injecting demineralized water into the reactor water side stream to produce an oxygenated stream with an increased oxygen concentration. The oxygenated stream may be tested to determine the effect of a process treatment on the reactor system.
    Type: Grant
    Filed: September 23, 2011
    Date of Patent: September 13, 2016
    Assignee: GE-HITACHI NUCLEAR ENERGY AMERICAS LLC
    Inventor: Thomas A. Caine
  • Patent number: 9268034
    Abstract: A nuclear reactor fuel integrity monitor includes: a ?-ray detector which detects ?-ray of a specific radionuclide of a subject measurement medium of a nuclear reactor; a sample container which retains the subject measurement medium therein and surrounds the circumference of the ?-ray detector; and a measurement control device which performs a control so that a predetermined amount of the subject measurement medium is introduced into the sample container and calculates a concentration of the specific radionuclide from ?-ray data per each unit time detected by the ?-ray detector and a volume of the subject measurement medium introduced into the sample container.
    Type: Grant
    Filed: October 22, 2014
    Date of Patent: February 23, 2016
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Takao Nishimura, Kenichiro Kino
  • Patent number: 9206043
    Abstract: A method of and apparatus for optimizing a hydrogen producing system is provided. The method of optimizing the hydrogen producing system comprises producing hydrogen gas using a hydrogen producing formulation and removing a chemical substance that reduces the hydrogen gas producing efficiency. Further, the hydrogen producing system comprises a hydrogen producing catalyst, a hydrogen generating voltage applied to the hydrogen producing catalyst to generate hydrogen gas, and a catalyst regenerating device to regenerate the hydrogen producing catalyst to a chemical state capable of generating the hydrogen gas when a hydrogen generating voltage is applied.
    Type: Grant
    Filed: May 29, 2013
    Date of Patent: December 8, 2015
    Assignee: Marine Power Products Incorporated
    Inventor: Jeffrey M. Carey
  • Patent number: 9165689
    Abstract: The present invention provides an operation method of a plant which has a low-pressure feed water heater, a deaerator and a high-pressure feed water heater sequentially arranged in a feed water pipe reaching a steam generator from a condenser, and leads high-temperature feed water to the steam generator, wherein an oxidant is injected onto a surface of a structural material from an oxidant injection line in order to form a film that suppresses an elution of an element constituting the structural material such as the feed water pipe, the low-pressure feed water heater, the deaerator and the high-pressure feed water heater, which come in contact with the high-temperature feed water, and a corrosion suppression substance is further introduced from a corrosion suppression substance introduction line in order to deposit the corrosion suppression substance on a surface of the structural material in which corrosion accelerated by a flow of the feed water occurs.
    Type: Grant
    Filed: February 8, 2010
    Date of Patent: October 20, 2015
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Osamu Shibasaki, Masato Okamura, Seiji Yamamoto, Toyoaki Miyazaki, Kenji Yamazaki, Tetsuji Kaneko, Minoru Kobayashi
  • Patent number: 9076559
    Abstract: An object is to reduce radiation exposure in a nuclear plant. A nuclear plant 1 is a nuclear power generating plant where steam is generated by thermal energy generated by nuclear fission of a nuclear fuel 2C in a nuclear reactor 2, and a turbine 8 is driven by the steam to generate heat by a power generator 10. After a nuclear plant 1 is newly constructed, when a primary cooling system of the nuclear reactor 2 raises the temperature to around a power operation temperature for the first time, zinc is injected into a primary coolant C1 present in the primary cooling system by a zinc injector 20.
    Type: Grant
    Filed: April 3, 2009
    Date of Patent: July 7, 2015
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Takao Nishimura, Ryuji Umehara
  • Publication number: 20150117587
    Abstract: This invention generally concerns radioactive decontamination of deposits on components in a nuclear power plant and is specifically concerned with improved systems and methods for disrupting, dissolving, removing and reducing at ambient temperature radionuclides formed on the primary side surfaces of components in a pressurized water reactor and the internal components of a boiling water reactor. The methods include identifying the structure, taking the structure out of operational service, contacting the structure with an aqueous solution (e.g., a recirculating flow or static immersion), and adding an effective amount of elemental metal in solid form to the aqueous solution.
    Type: Application
    Filed: October 29, 2013
    Publication date: April 30, 2015
    Applicant: WESTINGHOUSE ELECTRIC COMPANY LLC
    Inventors: KURTIS R. CRYTZER, Lauren R. Ikeda, Nicole D. Vitale
  • Publication number: 20150085967
    Abstract: Provided are radiation source reducing system and method for nuclear power plants whereby radiation source can be reduced. This radiation source reducing system for nuclear power plants is characterized in being provided with a dispersant injecting unit, which injects a dispersant into a coolant of a nuclear power plant coolant system.
    Type: Application
    Filed: March 25, 2013
    Publication date: March 26, 2015
    Applicant: THE JAPAN ATOMIC POWER COMPANY
    Inventors: Yutaka Ueyama, Wataru Sugino
  • Publication number: 20150085966
    Abstract: A method of reforming a metal surface of a cooling or circulating system of a nuclear or thermal power plant is provided. The method of reforming a metal surface of a cooling or circulating system of a nuclear or thermal power plant includes injecting metal ions or metal nanoparticles into a cooling or circulating system of a nuclear or thermal power plant (S11), converting the injected metal ions into metal particles by a chemical reaction with hydrogen (H2), hydrazine (N2H4), or amine in water (S12), and forming an insulating layer or a catalyst layer by depositing metal particles or metal nanoparticles on a metal surface or an oxide coating film of the cooling or circulating system (S13).
    Type: Application
    Filed: October 10, 2013
    Publication date: March 26, 2015
    Applicant: SOONCHUNHYANG UNIVERSITY INDUSTRY ACADEMY COOPERATION FOUNDATION
    Inventors: In Hyoung RHEE, Hyun Jun Jung
  • Patent number: 8976920
    Abstract: A nuclear power plant with an improved cooling system using nanoparticles in solid or fluid form is provided. The nanoparticles are delivered in locations such as the cold leg accumulator and high and low pressure pumps of an emergency core cooling system. Motor driven valves and pressurization can aid in the delivery. Methods for providing the nanoparticles are also provided.
    Type: Grant
    Filed: March 2, 2007
    Date of Patent: March 10, 2015
    Assignee: Areva NP
    Inventors: Mihai G. M. Pop, Brian Glenn Lockamon
  • Patent number: 8798225
    Abstract: A radiation exposure reduction method includes the steps of: injecting iron into a coolant which flows from the reactor cooling system to the reactor core in a nuclear power plant; and ferritizing and fixing radionuclides or parent nuclides thereof, which are contained in the coolant, on the surface of a reactor core structure, wherein an iron citrate which is soluble organic iron, or iron oxalate or iron fumarate which has a particle diameter of 3 ?m or less, is used as the iron to be injected into the coolant.
    Type: Grant
    Filed: November 4, 2009
    Date of Patent: August 5, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yumi Yaita, Seiji Yamamoto, Hajime Hirasawa, Yutaka Uruma
  • Publication number: 20140211903
    Abstract: A method of operating a power generator is provided. The method includes determining an amount of oxides on a heat transfer surface of the power generator as a function of a concentration of a noble metal substance in the oxides; and altering operation of the power generator when the amount of oxides on the heat transfer surface reaches a predetermined value. A method of operating a nuclear reactor is also provided.
    Type: Application
    Filed: January 28, 2013
    Publication date: July 31, 2014
    Applicant: AREVA NP INC.
    Inventors: Carola A. Gregorich, John M. Riddle, Mihai G. M. Pop
  • Patent number: 8774341
    Abstract: A nuclear power plant is provided including a BWR, a reactor cooling system cooling the BWR, an HWC hydrogen injection system connected to the reactor cooling system and an alcohol injection system connected to the reactor cooling system. Methods for providing methanol and hydrogen are also provided.
    Type: Grant
    Filed: September 28, 2007
    Date of Patent: July 8, 2014
    Assignees: AREVA Inc., AREVA NP GmbH
    Inventors: Bernhard Stellwag, Mihai G. M. Pop
  • Publication number: 20140140465
    Abstract: An aqueous solution of alkali hexahydroxo platinate is produced. As a alkali hexahydroxo platinate, sodium hexahydroxoplatinate or potassium hexahydroxoplatinate is used. The aqueous solution of alkali hexahydroxo platinate is passed through a hydrogen form cation exchange resin layer in a cation exchange resin tower. The aqueous solution of alkali hexahydroxo platinate makes contact with the hydrogen form cation exchange resin of the hydrogen form cation exchange resin layer, thus a suspension of hexahydroxo platinic is generated. If gamma rays are irradiated to the suspension, a platinum oxide colloidal solution in which colloidal particles including a platinum dioxide, a platinum monoxide, and a platinum hydroxide exist is generated. In a platinum oxide colloidal solution, the content of impurities is little and a noble metal compound is dispersed stably in water.
    Type: Application
    Filed: November 19, 2013
    Publication date: May 22, 2014
    Applicant: Hitachi-GE Nuclear Energy Ltd.
    Inventors: Kazushige ISHIDA, Masahiko TACHIBANA, Yoichi WADA, Nobuyuki OTA
  • Patent number: 8731132
    Abstract: In a nuclear power plant, a corrosion-resistant oxide film on a surface of the metal component of a reactor structure is exposed to a high-temperature water, the corrosion-resistant oxide film containing an oxide having a property of a P-type semiconductor, and a catalytic substance having a property of an N-type semiconductor is deposited on the oxide film. The oxide film maintains the property of the P-type semiconductor.
    Type: Grant
    Filed: January 31, 2012
    Date of Patent: May 20, 2014
    Assignees: Kabushiki Kaisha Toshiba, The Tokyo Electric Power Company, Incorporated
    Inventors: Masato Okamura, Tetsuo Oosato, Seiji Yamamoto, Tadasu Yotsuyanagi, Nagayoshi Ichikawa, Kenji Yamazaki, Junichi Takagi, Hidehiro Urata, Shunichi Suzuki, Kenro Takamori, Junichi Suzuki
  • Patent number: 8681925
    Abstract: In a nuclear power plant, a corrosion-resistant oxide film on a surface of the metal component of a reactor structure is exposed to a high-temperature water, the corrosion-resistant oxide film containing an oxide having a property of a P-type semiconductor, and a catalytic substance having a property of an N-type semiconductor is deposited on the oxide film. The oxide film maintains the property of the P-type semiconductor.
    Type: Grant
    Filed: January 31, 2012
    Date of Patent: March 25, 2014
    Assignees: Kabushiki Kaisha Toshiba, The Tokyo Electric Power Company, Incorporated
    Inventors: Masato Okamura, Tetsuo Oosato, Seiji Yamamoto, Tadasu Yotsuyanagi, Nagayoshi Ichikawa, Kenji Yamazaki, Junichi Takagi, Hidehiro Urata, Shunichi Suzuki, Kenro Takamori, Junichi Suzuki
  • Patent number: 8675807
    Abstract: Disclosed is a basket 50 that is located within a basket containment vessel, into which a boric acid solution capable of dissolving a pH adjuster flows, and can allow a pH adjuster solution to flow out by the inflowing boric acid solution. The basket 50 includes a plurality of containment units 71 stacked in a vertical direction with a predetermined first space L1 therebetween. The pH adjuster can be stored in each of the containment units 71. Also disclosed is a pH adjusting device including the basket 50, the basket containment vessel in which the basket 50 can be contained and in which cooling water can be stored, and an overflow pipe that, within the basket containment vessel, allows the pH adjuster solution that is obtained from the pH adjuster dissolved in the cooling water to flow out.
    Type: Grant
    Filed: April 8, 2009
    Date of Patent: March 18, 2014
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Koichi Tanimoto, Masaharu Watabe, Jiro Kasahara
  • Patent number: 8652271
    Abstract: A bath containing nickel ions and formic acid is injected into a film-forming aqueous solution flowing in a circulation pipe connected to feed water pipe made of carbon steel in a BWR plant. This film-forming aqueous solution is supplied into the feed water pipe through the circulation pipe, and then, a nickel metal film is formed on an inner surface of the feed water pipe. After the nickel metal film is formed, a film-forming aqueous solution containing iron (II) ions, formic acid, nickel ions, hydrogen peroxide, and hydrazine is supplied to the feed water pipe. A nickel ferrite film is formed on the surface of the nickel metal film in the feed water pipe. Then, the nickel ferrite film is come into contact with water containing dissolved-oxygen at 150° C. or above to transform the nickel metal film into a nickel ferrite film. A thick nickel ferrite film is formed on the inner surface of the feed water pipe. Corrosion of the carbon steel member composing the plant can further reduce.
    Type: Grant
    Filed: August 3, 2010
    Date of Patent: February 18, 2014
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Tsuyoshi Ito, Hideyuki Hosokawa, Yukio Hirama, Motoaki Sakashita, Makoto Nagase
  • Patent number: 8652272
    Abstract: A bath containing nickel ions and formic acid is injected into a film-forming aqueous solution flowing in a circulation pipe connected to a feed water pipe made of carbon steel in a BWR plant. This solution is supplied into the pipe through the circulation pipe, and a nickel metal film is formed on an inner surface of the pipe. After the film is formed, a film-forming aqueous solution containing iron (II) ions, formic acid, nickel ions, hydrogen peroxide, and hydrazine is supplied to the pipe. A nickel ferrite film is formed on the surface of the nickel metal film in the pipe. The nickel ferrite film comes into contact with water containing dissolved oxygen at or above 150° C. to transform the nickel metal film into a nickel ferrite film. A thick nickel ferrite film is formed on the inner surface of the feed water pipe.
    Type: Grant
    Filed: January 22, 2013
    Date of Patent: February 18, 2014
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Tsuyoshi Ito, Hideyuki Hosokawa, Yukio Hirama, Motoaki Sakashita, Makoto Nagase
  • Publication number: 20140037037
    Abstract: A noble metal injection apparatus is connected to a piping of a nuclear plant at the time of stop of the nuclear plant before start of the nuclear plant. In chemical decontamination, oxidation decontamination agent decomposition, and reduction decontamination on an inner surface of the pipe system are executed. After reduction decontamination, a part of an oxalic acid included in a reduction decontamination solution is decomposed and platinum is injected into the reduction decontamination solution of pH 3.5 or higher. When the platinum concentration becomes a preset concentration, a reduction agent is injected and the reduction decontamination solution including the platinum and reduction agent is brought into contact with the inner surface of the piping. The platinum is deposited on the inner surface of the piping. The injection of the platinum and reduction agent is stopped and the platinum and reduction agent are decomposed.
    Type: Application
    Filed: November 16, 2012
    Publication date: February 6, 2014
    Applicant: HITACHI-GE NUCLEAR ENERGY, LTD.
    Inventors: Tsuyoshi ITO, Hideyuki HOSOKAWA, Makoto NAGASE, Yoichi WADA, Kazushige ISHIDA, Motohiro AIZAWA
  • Publication number: 20130272476
    Abstract: A method for protecting the components of the primary system of a boiling water reactor, especially against stress cracking corrosion, includes feeding a reducing agent into the primary coolant in order to reduce the number of substances having a oxidizing effect or in order to modify the electrochemical potential of the component surfaces covered with an oxide layer to negative values. An alcohol that can be oxidized in the conditions of a reactor is fed in as a reducing agent, preferably in a liquid form, into the primary coolant. The component surfaces are provided with a blank coating or a single intrinsic oxide coating.
    Type: Application
    Filed: June 10, 2013
    Publication date: October 17, 2013
    Inventors: Bernhard Stellwag, Wilfried Ruehle
  • Publication number: 20130251086
    Abstract: The present application is related to a concentrated decontaminating reagent composition and related method useful for decontamination of nuclear reactors, or components thereof. The concentrated reagent composition is injected into the nuclear reactor, or component thereof, to form a dilute reagent that comprises from about 0.6 to about 3.0 g/L (2.1-10.3 mM) EDTA and from about 0.4 to about 2.2 g/L (2.1-11.5 mM) citric acid. The composition and method of this application can be used effectively in a regenerative process to decontaminate a nuclear reactor, or a component of thereof, with high efficiency without causing significant corrosion to the components of the cooling systems.
    Type: Application
    Filed: July 21, 2010
    Publication date: September 26, 2013
    Applicant: ATOMIC ENERGY OF CANADA LIMITED
    Inventors: Robert A. Speranzini, Douglas Miller, Jaleh Semmler
  • Patent number: 8494107
    Abstract: A formic acid aqueous solution that contains Fe (II) ions is produced by dissolving metal iron in a formic acid aqueous solution. Nitrogen is supplied from a nitrogen supply device to a chemical liquid tank and then discharged from a discharge line to reduce the dissolved oxygen concentration in the aqueous solution. The chemical liquid tank is filled with the formic acid aqueous solution sealed with nitrogen, and is transferred from a factory to a nuclear reactor building designated as radiation-controlled areas. Inside the nuclear reactor building, the chemical liquid tank is installed in a film deposition apparatus connected to a reactor water recirculation pipeline. The formic acid aqueous is supplied from the chemical liquid tank to the inside of the reactor water recirculation pipeline, and then a ferrite film is formed on the inner surface of the reactor water recirculation pipeline.
    Type: Grant
    Filed: April 30, 2008
    Date of Patent: July 23, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Hideyuki Hosokawa, Makoto Nagase, Satoshi Morisawa, Motoaki Sakashita, Katsuo Yokota
  • Patent number: 8457270
    Abstract: 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 chemical for adjusting the pH of a processing solution containing a mixture of the first and second chemicals to be 5.5 to 9.0 with the metal member surface in a time period from a finishing stage in decontamination step of removing contaminants formed on the surface of metal member composing the nuclear power plant, and suppressing deposition of radionuclides on the metal member by the ferrite film.
    Type: Grant
    Filed: January 4, 2011
    Date of Patent: June 4, 2013
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Hideyuki Hosokawa, Makoto Nagase, Kazushige Ishida, Yoichi Wada, Naoshi Usui, Motohiro Aizawa, Motomasa Fuse
  • Patent number: 8433030
    Abstract: Crystal habit modifiers (CHM) are provided to ameliorate deposit-related concerns in nuclear plant systems. The principal targets for utilization of crystal habit modifiers are Pressure Water Reactor (PWR) primary-side fuel rod crud and secondary-side steam generator deposits and Boiling Water Reactor (BWR) coolant system deposits.
    Type: Grant
    Filed: December 1, 2009
    Date of Patent: April 30, 2013
    Assignee: Electric Power Research Institute, Inc.
    Inventors: Keith Paul Fruzzetti, Karen Samie Kim, Robert Douglas Varrin, Jr., Charles Marks
  • Patent number: 8379789
    Abstract: This invention relates to a nuclear plant having a reactor vessel and a fluid circuit including flow path defining means, defining a flow path for circulating a reactor coolant fluid from and to the reactor vessel. The nuclear plant includes a particle collection zone defined along at least part of the length of the flow path, and particle deflection means arranged in particle deflecting relationship with the flow path to deflect particles from a fluid stream in the flow path into or toward the particle collection zone.
    Type: Grant
    Filed: July 27, 2011
    Date of Patent: February 19, 2013
    Assignee: Pebble Bed Modular Reactor (Proprietary) Limited
    Inventors: Leszek Andrzej Kuczynski, Francis Pieter Van Ravenswaay
  • Patent number: 8320514
    Abstract: In a nuclear power plant, a corrosion-resistant oxide film on a surface of the metal component of a reactor structure is exposed to a high-temperature water, the corrosion-resistant oxide film containing an oxide having a property of a P-type semiconductor, and a catalytic substance having a property of an N-type semiconductor is deposited on the oxide film. The oxide film maintains the property of the P-type semiconductor.
    Type: Grant
    Filed: December 8, 2005
    Date of Patent: November 27, 2012
    Assignees: Kabushiki Kaisha Toshiba, The Tokyo Electric Power Company, Incorporated
    Inventors: Masato Okamura, Tetsuo Oosato, Seiji Yamamoto, Tadasu Yotsuyanagi, Nagayoshi Ichikawa, Kenji Yamazaki, Junichi Takagi, Hidehiro Urata, Shunichi Suzuki, Kenro Takamori, Junichi Suzuki
  • Publication number: 20120288050
    Abstract: The present invention relates generally to a process for a pressurized water reactor. The pressurized water reactor includes a primary circuit and a reactor core. The process includes adding a sufficient amount of an organic compound to coolant water passing through the primary circuit of the pressurized water reactor. The organic compound includes elements of carbon and hydrogen for producing elemental carbon.
    Type: Application
    Filed: June 20, 2012
    Publication date: November 15, 2012
    Applicant: WESTINGHOUSE ELECTRIC COMPANY, LLC
    Inventors: William Connor, Rachel DeVito
  • Patent number: 8311178
    Abstract: A pH adjusting apparatus arranged above a water pit for refueling disposed in a reactor container that stores a nuclear reactor includes a pH adjuster, a basket 50 that contains the pH adjuster, and a basket housing container 51 that houses the basket 50 therein and has formed therein an inlet through which a solvent for dissolving or diluting the pH adjuster flows in and an overflow pipe 52 through which a pH-adjusted solution generated by dissolving or mixing the pH adjuster in the solvent flows out to the water pit for refueling. Consequently, even if it is difficult to dispose the basket 50 on a floor of the water pit for refueling, it is possible to suitably perform pH adjustment in the reactor container.
    Type: Grant
    Filed: February 28, 2008
    Date of Patent: November 13, 2012
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Hiroshi Sano, Takafumi Ogino, Yoshiyuki Tanigawa, Shiro Kato
  • Patent number: 8295426
    Abstract: In a method of reducing corrosion of a material constituting a nuclear reactor structure, an electrochemical corrosion potential is controlled by injecting a solution or a suspension containing a substance generating an excitation current by an action of at least one of radiation, light, and heat existing in a nuclear reactor, or a metal or a metallic compound forming the substance generating the excitation current under the condition in the nuclear reactor to allow the substance generating the excitation current to adhere to the surface of the nuclear reactor structural material, and by injecting hydrogen in cooling water of the nuclear reactor while controlling the hydrogen concentration in a feed water.
    Type: Grant
    Filed: December 10, 2004
    Date of Patent: October 23, 2012
    Assignees: Kabushiki Kaisha Toshiba, Ishikawajima-Harima Heavy Industries Co., Ltd., The Tokyo Electric Power Company, Incorporated
    Inventors: Seiji Yamamoto, Tadasu Yotsuyanagi, Nagayoshi Ichikawa, Tetsuo Oosato, Masato Okamura, Junichi Takagi, Kenji Yamazaki, Shunichi Suzuki, Kenro Takamori, Mitsuru Sambongi, Takeshi Shibano, Takashi Hirano, Yuichi Fukaya
  • Publication number: 20120263269
    Abstract: In a method of reducing corrosion of a material constituting a nuclear reactor structure, an electrochemical corrosion potential is controlled by injecting a solution or a suspension containing a substance generating an excitation current by an action of at least one of radiation, light, and heat existing in a nuclear reactor, or a metal or a metallic compound forming the substance generating the excitation current under the condition in the nuclear reactor to allow the substance generating the excitation current to adhere to the surface of the nuclear reactor structural material, and by injecting hydrogen in cooling water of the nuclear reactor while controlling the hydrogen concentration in a feed water.
    Type: Application
    Filed: December 10, 2004
    Publication date: October 18, 2012
    Applicants: Kabushiki Kaisha Toshiba, THE TOKYO ELECTRIC POWER COMPANY, INCORPORATED, Ishikawajima-Harima Heavy Industries Co., Ltd.
    Inventors: Seiji Yamamoto, Tadasu Yotsuyanagi, Nagayoshi Ichikawa, Tetsuo Oosato, Masato Okamura, Junichi Takagi, Kenji Yamazaki, Shunichi Suzuki, Kenro Takamori, Mitsuru Sambongi, Takeshi Shibano, Takashi Hirano, Yuichi Fukaya
  • Patent number: 8259894
    Abstract: A formic acid aqueous solution that contains Fe (II) ions is produced by dissolving metal iron in a formic acid aqueous solution. Nitrogen is supplied from a nitrogen supply device to a chemical liquid tank and then discharged from a discharge line to reduce the dissolved oxygen concentration in the aqueous solution. The chemical liquid tank is filled with the formic acid aqueous solution sealed with nitrogen, and transferred from a factory to a nuclear reactor building designated as radiation-controlled areas. Inside the nuclear reactor building, the chemical liquid tank is installed in a film deposition apparatus connected to a reactor water recirculation pipeline. The formic acid aqueous is supplied from the chemical liquid tank to the inside of the reactor water recirculation pipeline, and then a ferrite film is formed on the inner surface of the reactor water recirculation pipeline.
    Type: Grant
    Filed: June 26, 2007
    Date of Patent: September 4, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Hideyuki Hosokawa, Makoto Nagase, Satoshi Morisawa, Motoaki Sakashita, Katsuo Yokota
  • Patent number: 8258794
    Abstract: A measuring device for carrying out purity measurements in a media circuit of a power station with an ion exchanger device and a measuring means for measuring a parameter of a media current flowing through the ion exchanger device is described. In order to obtain measurements in a rapid and reliable manner at the start up of the ion exchanger device, for example during the start-up phase of the power station, it is suggested that the ion exchanger device has two flow paths for two different operating modes of the power station.
    Type: Grant
    Filed: June 1, 2007
    Date of Patent: September 4, 2012
    Assignee: Siemens Aktiengesellschaft
    Inventor: Michael Rziha
  • Patent number: 8233581
    Abstract: The present invention relates generally to a process for a pressurized water reactor. The pressurized water reactor includes a primary circuit and a reactor core. The process includes adding a sufficient amount of an organic compound to coolant water passing through the primary circuit of the pressurized water reactor. The organic compound includes elements of carbon and hydrogen for producing elemental carbon.
    Type: Grant
    Filed: March 31, 2009
    Date of Patent: July 31, 2012
    Assignee: Westinghouse Electric Company LLC
    Inventors: William Connor, Rachel DeVito
  • Patent number: 8194816
    Abstract: A nuclear power plant is provided including a BWR, a reactor cooling system cooling the BWR, an HWC hydrogen injection system connected to the reactor cooling system and an alcohol injection system connected to the reactor cooling system. Methods for providing methanol and hydrogen are also provided.
    Type: Grant
    Filed: December 1, 2009
    Date of Patent: June 5, 2012
    Assignees: AREVA NP Inc., AREVA NP GmbH
    Inventors: Bernhard Stellwag, Mihai G. M. Pop
  • Patent number: 8175211
    Abstract: 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 of radioactive cobalt-60, etc. in the reactor water. Hydrogen and a reductive nitrogen compound containing nitrogen having a negative oxidation number (for example, hydrazine) are injected into the core water of boiling water nuclear power plant. By injecting the reductive nitrogen compound containing nitrogen having a negative oxidation number into the core water, the stress corrosion cracking of structural material of reactor can be mitigated without side reactions such as a rise in the concentration of cobalt-60, etc.
    Type: Grant
    Filed: June 18, 2008
    Date of Patent: May 8, 2012
    Assignee: Hitachi-Ge Nuclear Energy, Ltd.
    Inventors: Kazushige Ishida, Yoichi Wada, Makoto Nagase, Masahiko Tachibana, Masao Endo, Motomasa Fuse, Naoshi Usui, Motohiro Aizawa
  • Publication number: 20120039429
    Abstract: The present invention provides an operation method of a plant which has a low-pressure feed water heater, a deaerator and a high-pressure feed water heater sequentially arranged in a feed water pipe reaching a steam generator from a condenser, and leads high-temperature feed water to the steam generator, wherein an oxidant is injected onto a surface of a structural material from an oxidant injection line in order to form a film that suppresses an elution of an element constituting the structural material such as the feed water pipe, the low-pressure feed water heater, the deaerator and the high-pressure feed water heater, which come in contact with the high-temperature feed water, and a corrosion suppression substance is further introduced from a corrosion suppression substance introduction line in order to deposit the corrosion suppression substance on a surface of the structural material in which corrosion accelerated by a flow of the feed water occurs.
    Type: Application
    Filed: February 8, 2010
    Publication date: February 16, 2012
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Osamu Shibasaki, Masato Okamura, Seiji Yamamoto, Toyoaki Miyazaki, Kenji Yamazaki, Tetsuji Kaneko, Minoru Kobayashi
  • Patent number: 8054933
    Abstract: 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 concentrated solution form, which is internally diluted by the system prior to discharging from the skid. The injection system minimizes chemical loss due to deposition on the transit line, enables a higher concentrated solution to be used as the injectant, eliminates the time consuming laborious process of chemical dilution, raises chemical solution to the pressure required for injection, prevents solid precipitations out of solution at the injection pump head through the use of a flush solution, and deposits fresh chemical on new crack surfaces that develop during a power reactor start-up, shutdown and operation.
    Type: Grant
    Filed: December 17, 2007
    Date of Patent: November 8, 2011
    Assignee: GE-Hitachi Nuclear Energy Americas LLC
    Inventors: Luong Cam Tran, Thomas P. Diaz, Samson Hettiarachchi, Paul Y. Shu, David P. Siegwarth
  • Patent number: 8040997
    Abstract: A pH adjusting system includes a water pit for refueling 35 that is disposed in a reactor container 10, which stores a reactor, and is capable of storing cooling water and a pH adjusting apparatus 37 that is disposed above the water pit for refueling 35 and houses a pH adjuster. The pH adjusting apparatus 37 causes a pH-adjusted solution generated by dissolving or mixing the pH adjuster to flow out to the water pit for refueling 35 below the pH adjusting apparatus 37. Consequently, even when it is difficult to dispose the pH adjusting apparatus on a floor of the water pit for refueling, it is possible to suitably perform pH adjustment in the reactor container 10.
    Type: Grant
    Filed: February 28, 2008
    Date of Patent: October 18, 2011
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Hiroshi Sano, Takafumi Ogino, Yoshiyuki Tanigawa, Shiro Kato
  • Publication number: 20110176649
    Abstract: 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 chemical for adjusting the pH of a processing solution containing a mixture of the first and second chemicals to be 5.5 to 9.0 with the metal member surface in a time period from a finishing stage in decontamination step of removing contaminants formed on the surface of metal member composing the nuclear power plant, and suppressing deposition of radionuclides on the metal member by the ferrite film.
    Type: Application
    Filed: January 4, 2011
    Publication date: July 21, 2011
    Applicant: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Hideyuki HOSOKAWA, Makoto Nagase, Kazushige Ishida, Yoichi Wada, Naoshi Usui, Motohiro Aizawa, Motomasa Fuse
  • Publication number: 20110075785
    Abstract: An object is to reduce radiation exposure in a nuclear plant. A nuclear plant 1 is a nuclear power generating plant where steam is generated by thermal energy generated by nuclear fission of a nuclear fuel 2C in a nuclear reactor 2, and a turbine 8 is driven by the steam to generate heat by a power generator 10. After a nuclear plant 1 is newly constructed, when a primary cooling system of the nuclear reactor 2 raises the temperature to around a power operation temperature for the first time, zinc is injected into a primary coolant C1 present in the primary cooling system by a zinc injector 20.
    Type: Application
    Filed: April 3, 2009
    Publication date: March 31, 2011
    Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Takao Nishimura, Ryuji Umehara
  • Patent number: 7889828
    Abstract: 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 chemical for adjusting the pH of a processing solution containing a mixture of the first and second chemicals to be 5.5 to 9.0 with the metal member surface in a time period from a finishing stage in decontamination step of removing contaminants formed on the surface of metal member composing the nuclear power plant, and suppressing deposition of radionuclides on the metal member by the ferrite film.
    Type: Grant
    Filed: March 25, 2009
    Date of Patent: February 15, 2011
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Hideyuki Hosokawa, Makoto Nagase, Kazushige Ishida, Yoichi Wada, Naoshi Usui, Motohiro Aizawa, Motomasa Fuse
  • Patent number: 7869557
    Abstract: 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 of radioactive cobalt-60, etc. in the reactor water. Hydrogen and a reductive nitrogen compound containing nitrogen having a negative oxidation number (for example, hydrazine) are injected into the core water of boiling water nuclear power plant. By injecting the reductive nitrogen compound containing nitrogen having a negative oxidation number into the core water, the stress corrosion cracking of structural material of reactor can be mitigated without side reactions such as a rise in the concentration of cobalt-60, etc.
    Type: Grant
    Filed: January 16, 2009
    Date of Patent: January 11, 2011
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Kazushige Ishida, Yoichi Wada, Makoto Nagase, Masahiko Tachibana, Masao Endo, Motomasa Fuse, Naoshi Usui, Motohiro Aizawa