Patents by Inventor Bernhard Stellwag

Bernhard Stellwag has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11170902
    Abstract: A nuclear power plant comprising a primary coolant circuit, a steam-water circuit separated from the primary coolant circuit and a steam generator connected to the primary coolant circuit and the steam-water circuit to transfer heat from the primary coolant circuit into the steam-water circuit has at least one dosing point in the steam-water circuit to inject a reducing agent into the steam-water circuit, wherein the reducing agent is an organic compound consisting of carbon, hydrogen and oxygen. Furthermore, a method for operating said nuclear power plant and the use of the method for downtime preservation of the secondary side of a steam generator of a nuclear power plant are provided.
    Type: Grant
    Filed: November 22, 2016
    Date of Patent: November 9, 2021
    Assignee: FRAMATOME GMBH
    Inventors: Bernhard Stellwag, Jörg Fandrich
  • Publication number: 20180322969
    Abstract: A nuclear power plant comprising a primary coolant circuit, a steam-water circuit separated from the primary coolant circuit and a steam generator connected to the primary coolant circuit and the steam-water circuit to transfer heat from the primary coolant circuit into the steam-water circuit has at least one dosing point in the steam-water circuit to inject a reducing agent into the steam-water circuit, wherein the reducing agent is an organic compound consisting of carbon, hydrogen and oxygen. Furthermore, a method for operating said nuclear power plant and the use of the method for downtime preservation of the secondary side of a steam generator of a nuclear power plant are provided.
    Type: Application
    Filed: November 22, 2016
    Publication date: November 8, 2018
    Inventors: Bernhard Stellwag, Jörg Fandrich
  • Patent number: 9947425
    Abstract: The invention relates to a method for reducing the radioactive contamination of the surface of a component used in a nuclear reactor, which component is in contact with radioactively contaminated water, in which method a hydrophobic film is produced on the surface of a component by virtue of the surface being wetted with an aqueous solution which contains a film-forming amphiphilic substance.
    Type: Grant
    Filed: August 8, 2014
    Date of Patent: April 17, 2018
    Assignee: AREVA GMBH
    Inventors: Bernhard Stellwag, Luis Sempere-Belda, Ute Ramminger
  • Patent number: 9879351
    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: Grant
    Filed: June 10, 2013
    Date of Patent: January 30, 2018
    Assignee: AREVA Inc.
    Inventors: Bernhard Stellwag, Wilfried Ruehle
  • Publication number: 20160196889
    Abstract: The invention relates to a method for reducing the radioactive contamination of the surface of a component used in a nuclear reactor, which component is in contact with radioactively contaminated water, in which method a hydrophobic film is produced on the surface of a component by virtue of the surface being wetted with an aqueous solution which contains a film-forming amphiphilic substance.
    Type: Application
    Filed: August 8, 2014
    Publication date: July 7, 2016
    Inventors: Bernhard STELLWAG, Luis SEMPERE-BELDA, Ute RAMMINGER
  • 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: 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
  • 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
  • Publication number: 20100080335
    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: Application
    Filed: December 1, 2009
    Publication date: April 1, 2010
    Applicant: AREVA NP INC.
    Inventors: Bernhard Stellwag, Mihai G.M. Pop
  • Publication number: 20090086878
    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: Application
    Filed: September 28, 2007
    Publication date: April 2, 2009
    Applicant: AREVA NP INC.
    Inventors: Bernhard Stellwag, Mihai G.M. Pop
  • Publication number: 20070263761
    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 21, 2007
    Publication date: November 15, 2007
    Applicant: AREVA NP
    Inventors: Bernhard Stellwag, Wilfried Ruehle
  • Publication number: 20050135542
    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: November 17, 2003
    Publication date: June 23, 2005
    Inventors: Bernhard Stellwag, Wilfried Ruhle
  • Patent number: 6898259
    Abstract: 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 optionally dried in a separate step. After the sol-gel process has been carried out, the conduction system is again filled with water. A liquid sol film that is produced on the component is dried, especially by means of hot air. A component in the primary system of a boiling water reactor can especially be coated with a highly corrosion-resistant zirconium oxide protective layer according to the sol-gel process.
    Type: Grant
    Filed: September 23, 2002
    Date of Patent: May 24, 2005
    Assignee: Framatome ANP GmbH
    Inventors: Bernhard Stellwag, Patricia Vaz
  • Publication number: 20050069078
    Abstract: 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 optionally dried in a separate step. After the sol-gel process has been carried out, the conduction system is again filled with water. A liquid sol film that is produced on the component is dried, especially by means of hot air. A component in the primary system of a boiling water reactor can especially be coated with a highly corrosion-resistant zirconium oxide protective layer according to the sol-gel process.
    Type: Application
    Filed: September 23, 2002
    Publication date: March 31, 2005
    Inventors: Bernhard Stellwag, Patricia Vaz
  • Patent number: 4775005
    Abstract: A method for the corrosion protection of steam generators having a housing containing feed water and enclosing a tube bundle with tubes conducting a heat carrier includes continuously determining the redox potential of the feed water during operation of the steam generator, continuously determining the corrosion potential of at least one tube of the tube bundle during operation of the steam generator, and negatively shifting the redox and corrosion potentials by changing the chemical conditioning of the feed water if the potentials indicate the danger of corrosion, and a device for carrying out the method.
    Type: Grant
    Filed: February 11, 1986
    Date of Patent: October 4, 1988
    Assignee: Kraftwerk Union Aktiengesellschaft
    Inventors: Werner Beyer, Norbert Wieling, Bernhard Stellwag