EP0180826A1 - Procédé pour décontaminer chimiquement les composants importants et les système métalliques des réacteurs nucléaires - Google Patents

Procédé pour décontaminer chimiquement les composants importants et les système métalliques des réacteurs nucléaires Download PDF

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Publication number
EP0180826A1
EP0180826A1 EP85113144A EP85113144A EP0180826A1 EP 0180826 A1 EP0180826 A1 EP 0180826A1 EP 85113144 A EP85113144 A EP 85113144A EP 85113144 A EP85113144 A EP 85113144A EP 0180826 A1 EP0180826 A1 EP 0180826A1
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EP
European Patent Office
Prior art keywords
ozone
primary coolant
decontamination
carried out
chemicals
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP85113144A
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German (de)
English (en)
Other versions
EP0180826B1 (fr
Inventor
Horst-Otto Bertholdt
Bernhard Dipl.-Ing. Kress (Fh)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Kraftwerk Union AG
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kraftwerk Union AG, Siemens AG filed Critical Kraftwerk Union AG
Publication of EP0180826A1 publication Critical patent/EP0180826A1/fr
Application granted granted Critical
Publication of EP0180826B1 publication Critical patent/EP0180826B1/fr
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Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/001—Decontamination of contaminated objects, apparatus, clothes, food; Preventing contamination thereof
    • G21F9/002—Decontamination of the surface of objects with chemical or electrochemical processes
    • G21F9/004—Decontamination of the surface of objects with chemical or electrochemical processes of metallic surfaces

Definitions

  • the invention relates to a process for the chemical decontamination of large components and systems made of metallic materials of nuclear reactors with a liquid primary coolant, the treatment being carried out by means of an aqueous solution of oxidizing chemicals which is moved by the large components and systems to be decontaminated.
  • the invention has the aim of an improvement in which, with one process step, the combination of chemicals increases the effectiveness of decontamination and, at the same time, the incidence of secondary waste is reduced.
  • the treatment temperature should be S 50 0 C.
  • nitrates, chromates or cerium IV salts are introduced as oxidizing chemicals into the primary coolant, which contains borate in particular, and that an addition of ozone is used.
  • the decontamination is carried out as a one-step treatment using an aqueous solution of oxidizing chemicals with the additional addition of ozone.
  • the chemicals with an oxidizing effect for example nitrates, chromates, cerium salts, are inexpensive and lead to ions which can be easily removed using ion exchange resins.
  • the pH value is lowered during decontamination by withdrawing the cations using an ion exchanger.
  • the concentration range of the oxidizing chemicals is preferably 100-1000 mg kg-1, of ozone 10-40 mg kg-1. The effectiveness of the solution is monitored by measuring the red-ox potential.
  • Table 1 shows results of the one-step treatment according to the invention using the example of original contaminated samples from a pressurized water nuclear power plant.
  • Fig. 1 shows the metal removal M using the N03 parameter study.
  • the ozone content is maintained according to the further invention by means of an external ozone enrichment path.
  • continuous degassing advantageously prevents gas cushions from forming in the system to be decontaminated.
  • the ozone fed in comes from an ozone generator 8, which is supplied with oxygen from the tank 9. This is partly converted into ozone by means of silent electrical discharge.
  • the gas containing ozone is sucked into the enrichment section 5 by the injector 6. The mass transfer between gas and liquid takes place in the injector 6 and in the subsequent liquid column.
  • Excess oxygen present in the decontamination circuit and the non-absorbed ozone from the enrichment section 5 are released from their upper end via an aerosol separator 10 and, after heating in a heating device 11, via a catalytic ozone destruction system 12.
  • the cations formed during the decontamination and the dissolved activity are withdrawn via ion exchangers 13 in a second bypass with a pump 14.
  • the ion exchangers 13 are then disposed of using known measures, for example dried and solidified with bitumen.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
EP85113144A 1984-10-31 1985-10-16 Procédé pour décontaminer chimiquement les composants importants et les système métalliques des réacteurs nucléaires Expired - Lifetime EP0180826B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3439857 1984-10-31
DE3439857 1984-10-31

Publications (2)

Publication Number Publication Date
EP0180826A1 true EP0180826A1 (fr) 1986-05-14
EP0180826B1 EP0180826B1 (fr) 1990-07-11

Family

ID=6249196

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85113144A Expired - Lifetime EP0180826B1 (fr) 1984-10-31 1985-10-16 Procédé pour décontaminer chimiquement les composants importants et les système métalliques des réacteurs nucléaires

Country Status (5)

Country Link
US (1) US4942594A (fr)
EP (1) EP0180826B1 (fr)
JP (1) JPS61110100A (fr)
DE (1) DE3578635D1 (fr)
ES (1) ES8700486A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0278256A1 (fr) * 1987-01-28 1988-08-17 Siemens Aktiengesellschaft Procédé et dispositif pour éliminer les couches d'oxydes
FR2689298A1 (fr) * 1992-03-24 1993-10-01 Framatome Sa Procédé d'élimination de dépôts de corrosion dans la partie secondaire d'un générateur de vapeur d'un réacteur nucléaire refroidi par de l'eau sous pression.
FR2701155A1 (fr) * 1993-02-02 1994-08-05 Framatome Sa Procédé et installation de décontamination de couvercles usagés de cuves de réacteurs nucléaires à eau légère.
WO1999043006A1 (fr) * 1998-02-20 1999-08-26 Centre D'etudes De L'energie Nucleaire Procede et installation de decontamination de surfaces metalliques

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0355628B1 (fr) * 1988-08-24 1993-11-10 Siemens Aktiengesellschaft Procédé pour décontaminer chimiquement la surface d'un élément de construction métallique d'une installation de réacteur nucléaire
DE3919885C2 (de) * 1989-06-19 1994-06-30 Wedeco Umwelttechnologien Wass Verfahren und Anlage zur Behandlung von mit schwer abbaubaren Schadstoffen belasteten wässrigen Flüssigkeiten
US5205999A (en) * 1991-09-18 1993-04-27 British Nuclear Fuels Plc Actinide dissolution
US5244000A (en) * 1991-11-13 1993-09-14 Hughes Aircraft Company Method and system for removing contaminants
DE19818772C2 (de) * 1998-04-27 2000-05-31 Siemens Ag Verfahren zum Abbau der Radioaktivität eines Metallteiles
US6635232B1 (en) * 1999-05-13 2003-10-21 Kabushiki Kaisha Toshiba Method of chemically decontaminating components of radioactive material handling facility and system for carrying out the same
JP3977963B2 (ja) * 1999-09-09 2007-09-19 株式会社日立製作所 化学除染方法
US6466636B1 (en) * 2000-07-26 2002-10-15 Westinghouse Electric Company Llc Decontamination method
TW529041B (en) * 2000-12-21 2003-04-21 Toshiba Corp Chemical decontamination method and treatment method and apparatus of chemical decontamination solution
JP3849925B2 (ja) * 2000-12-21 2006-11-22 株式会社東芝 化学除染方法
KR100724710B1 (ko) * 2002-11-21 2007-06-04 가부시끼가이샤 도시바 방사화 부품의 화학적 오염제거 시스템 및 방법
JP2004191259A (ja) * 2002-12-12 2004-07-08 Toshiba Corp 化学除染方法
JP3945780B2 (ja) * 2004-07-22 2007-07-18 株式会社日立製作所 原子力プラント構成部材の放射性核種の付着抑制方法および成膜装置
JP6901947B2 (ja) * 2017-09-29 2021-07-14 三菱重工業株式会社 化学除染方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4287002A (en) * 1979-04-09 1981-09-01 Atomic Energy Of Canada Ltd. Nuclear reactor decontamination
WO1984003170A1 (fr) * 1983-02-09 1984-08-16 Studsvik Energiteknik Ab Decontamination de reacteurs a eau sous pression
EP0134664A1 (fr) * 1983-07-12 1985-03-20 Westinghouse Electric Corporation Oxydation par l'ozone des dépôts dans les systèmes de refroidissement des réacteurs nucléaires

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1517664C3 (de) * 1965-02-27 1978-08-24 Gesellschaft Fuer Kernforschung Mbh, 7500 Karlsruhe Verfahren zum Dekontaminieren radioaktiver Wasser in Anwesenheit von Störsubstanzen
DE2613351C3 (de) * 1976-03-29 1982-03-25 Kraftwerk Union AG, 4330 Mülheim Verfahren zur chemischen Dekontamination von metallischen Bauteilen von Kernreaktoranlagen
CH619807A5 (fr) * 1976-04-07 1980-10-15 Foerderung Forschung Gmbh
US4226640A (en) * 1978-10-26 1980-10-07 Kraftwerk Union Aktiengesellschaft Method for the chemical decontamination of nuclear reactor components
US4284428A (en) * 1980-10-29 1981-08-18 Western Electric Co., Inc. Separation of contaminant material from copper wire and cable
US4685971A (en) * 1983-07-12 1987-08-11 Westinghouse Electric Corp. Ozone oxidation of deposits in cooling systems of nuclear reactors
US4481090A (en) * 1984-01-23 1984-11-06 The United States Of America As Represented By The United States Department Of Energy Decontaminating metal surfaces

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4287002A (en) * 1979-04-09 1981-09-01 Atomic Energy Of Canada Ltd. Nuclear reactor decontamination
WO1984003170A1 (fr) * 1983-02-09 1984-08-16 Studsvik Energiteknik Ab Decontamination de reacteurs a eau sous pression
EP0134664A1 (fr) * 1983-07-12 1985-03-20 Westinghouse Electric Corporation Oxydation par l'ozone des dépôts dans les systèmes de refroidissement des réacteurs nucléaires

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0278256A1 (fr) * 1987-01-28 1988-08-17 Siemens Aktiengesellschaft Procédé et dispositif pour éliminer les couches d'oxydes
FR2689298A1 (fr) * 1992-03-24 1993-10-01 Framatome Sa Procédé d'élimination de dépôts de corrosion dans la partie secondaire d'un générateur de vapeur d'un réacteur nucléaire refroidi par de l'eau sous pression.
FR2701155A1 (fr) * 1993-02-02 1994-08-05 Framatome Sa Procédé et installation de décontamination de couvercles usagés de cuves de réacteurs nucléaires à eau légère.
WO1999043006A1 (fr) * 1998-02-20 1999-08-26 Centre D'etudes De L'energie Nucleaire Procede et installation de decontamination de surfaces metalliques
BE1011754A3 (fr) * 1998-02-20 1999-12-07 En Nucleaire Etabilissement D Procede et installation de decontamination de surfaces metalliques.

Also Published As

Publication number Publication date
EP0180826B1 (fr) 1990-07-11
ES548371A0 (es) 1986-10-16
ES8700486A1 (es) 1986-10-16
US4942594A (en) 1990-07-17
DE3578635D1 (de) 1990-08-16
JPS61110100A (ja) 1986-05-28

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