Patents by Inventor Christian Topf

Christian Topf 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).

  • Publication number: 20210225543
    Abstract: A method for decontaminating a metal surface exposed to radioactive liquid or gas during operation of a nuclear facility comprises an oxidation step wherein a metal oxide layer on the metal surface is contacted with an aqueous oxidation solution comprising a permanganate oxidant for converting chromium into a Cr(VI) compound and dissolving the Cr(VI) compound in the oxidation solution; and a first cleaning step wherein the oxidation solution containing the Cr(VI) compound is directly passed over an anion exchange material and the Cr(VI) compound is immobilized on the anion exchange material. The method provides for substantial savings of radioactive waste and produces chelate-free waste.
    Type: Application
    Filed: January 8, 2018
    Publication date: July 22, 2021
    Inventors: Luis SEMPERE BELDA, Jose Pedro MOREIRA DO AMARAL, Christian TOPF
  • Publication number: 20210225544
    Abstract: The invention relates to a method of decontaminating a metal surface, wherein the metal surface is located on a component within a nuclear plant, in particular within the cooling system of a nuclear power plant, and is covered with a metal oxide layer containing radioactive substances, and wherein the method comprises a decontamination step in which a metal oxide layer pretreated in an oxidation step is contacted with an aqueous solution of an organic acid to dissolve the metal oxide layer, forming a decontamination solution containing the organic acid as well as metal ions and the radioactive substances, and wherein the decontamination solution is passed over an ion exchanger to immobilize the metal ions and the radioactive substances. An oxidant selected from the group consisting of oxygen, air, hydrogen peroxide and ozone is dosed into the decontamination solution to control the dissolution rate of the metal oxide layer.
    Type: Application
    Filed: June 28, 2018
    Publication date: July 22, 2021
    Inventors: Luis SEMPERE BELDA, Christian TOPF
  • Patent number: 10950360
    Abstract: A method for treating waste water from the decontamination of a metal surface in a primary coolant circuit of a nuclear reactor comprises discharging a predetermined amount of an oxidation solution from the primary coolant circuit into a reduction zone connected to the primary coolant circuit and reacting the oxidation solution with a reducing agent to form a reaction solution that is freed of oxidizing agent, and passing the reaction solution over an ion-exchange resin in order to form a desalinated solution, and returning the desalinated solution to the primary coolant and/or disposing of the desalinated solution. A waste water treatment apparatus for carrying out the method is also provided.
    Type: Grant
    Filed: March 1, 2017
    Date of Patent: March 16, 2021
    Assignee: FRAMATOME GMBH
    Inventors: Christian Topf, Luis Sempere Belda
  • Publication number: 20190074099
    Abstract: A method for treating waste water from the decontamination of a metal surface in a primary coolant circuit of a nuclear reactor comprises discharging a predetermined amount of an oxidation solution from the primary coolant circuit into a reduction zone connected to the primary coolant circuit and reacting the oxidation solution with a reducing agent to form a reaction solution that is freed of oxidizing agent, and passing the reaction solution over an ion-exchange resin in order to form a desalinated solution, and returning the desalinated solution to the primary coolant and/or disposing of the desalinated solution. A waste water treatment apparatus for carrying out the method is also provided.
    Type: Application
    Filed: March 1, 2017
    Publication date: March 7, 2019
    Applicant: Framatome GmbH
    Inventors: Christian TOPF, Luis SEMPERE BELDA
  • Publication number: 20150364226
    Abstract: The invention relates to a process for the chemical decontamination of a surface, having an oxide layer of a metallic component of the coolant system of a nuclear power station, which comprises at least one oxidation step in which the oxide layer is treated with an aqueous solution containing an oxidant and a subsequent decontamination step in which the oxide layer is treated with an aqueous solution of a decont. acid which has the property of forming a sparingly soluble precipitate with metal ions, in particular with nickel ions. Prior to carrying out the decontamination step, metal ions which have gone into solution during the oxidation step are removed from the aqueous solution by means of a cation exchanger.
    Type: Application
    Filed: December 11, 2013
    Publication date: December 17, 2015
    Inventors: Luis SEMPERE BELDA, Jose Pedro MOREIRA DO AMARAL, Christian TOPF
  • Publication number: 20100288707
    Abstract: A method is provided for conditioning a waste solution obtained during the wet-chemical cleaning of conventional or nuclear plants and containing organic substances and metals in ionic form. At least a portion of the organic substance is degraded by electrochemical treatment or UV radiation of the waste solution, at least one metal precipitates by the addition of phosphoric acid and a resultant phosphate precipitate is removed from the waste solution.
    Type: Application
    Filed: July 27, 2010
    Publication date: November 18, 2010
    Applicant: AREVA NP GMBH
    Inventors: CHRISTIAN TOPF, SILVIA SCHUSS, FRANZ AMMANN
  • Publication number: 20100252449
    Abstract: A method for conditioning a cleaning solution resulting from the wet chemical cleaning of a nuclear steam generator, includes electrolytically treating the cleaning solution and depositing radioactive metal nuclides contained in the cleaning solution on a cathode.
    Type: Application
    Filed: June 17, 2010
    Publication date: October 7, 2010
    Applicant: AREVA NP GMBH
    Inventors: Rainer Gassen, Christian Topf