EP0313843B2 - Procédé pour décontaminer des surfaces - Google Patents

Procédé pour décontaminer des surfaces Download PDF

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Publication number
EP0313843B2
EP0313843B2 EP88116003A EP88116003A EP0313843B2 EP 0313843 B2 EP0313843 B2 EP 0313843B2 EP 88116003 A EP88116003 A EP 88116003A EP 88116003 A EP88116003 A EP 88116003A EP 0313843 B2 EP0313843 B2 EP 0313843B2
Authority
EP
European Patent Office
Prior art keywords
treatment step
decontamination
acid
decontamination solution
samples
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.)
Expired - Lifetime
Application number
EP88116003A
Other languages
German (de)
English (en)
Other versions
EP0313843B1 (fr
EP0313843A1 (fr
Inventor
Erhard Schenker
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.)
Scherrer Paul Institut
ABB Reaktor GmbH
Original Assignee
Scherrer Paul Institut
Brown Boveri Reaktor GmbH
ABB Reaktor GmbH
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
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Application filed by Scherrer Paul Institut, Brown Boveri Reaktor GmbH, ABB Reaktor GmbH filed Critical Scherrer Paul Institut
Publication of EP0313843A1 publication Critical patent/EP0313843A1/fr
Publication of EP0313843B1 publication Critical patent/EP0313843B1/fr
Application granted granted Critical
Publication of EP0313843B2 publication Critical patent/EP0313843B2/fr
Anticipated expiration legal-status Critical
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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
    • 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 method for decontamination of surfaces according to the preamble of claim 1.
  • EP 0071336 A1 also describes a method for the chemical removal of deposits known in which using permanganate salt Decontamination is achieved in three steps becomes. Avoids the path taken there apparently the use of chromic acid.
  • a second treatment step is then, usually after an intermediate rinse that loosened Oxide layer in an acid, refractory and complex-forming Solution resolved and removed.
  • the oxidative treatment step there are a number of methods in use so z.
  • Other known methods see the use of permanganic acid, Hydrogen peroxide, cerium IV salts or others Oxidizing agents before.
  • the permanganic acid can preferably be prepared by adding an aqueous solution of a Alkali or alkaline earth permanganate via a cation exchanger passed and so the free acid is formed after the addition of chromic acid is used as a decontamination agent.
  • chromic acid and salts of Permanganic acid suitable as a decontamination agent; however, the additional imported cation with the radioactive waste slightly higher salt loads arise. Characterizing for the effectiveness of the decontamination agent are the pH and the redox potential of the Solution. Therefore, this can be easily grasped
  • the first treatment step is monitored and be controlled.
  • the effect of the first treatment step used decontamination solution by pumping, stirring or by application of ultrasound significantly increase.
  • Through the Chemical measures can also be the same Removal of the modified surface layers be accelerated in the second treatment step.
  • the Solution in the circuit via an ion exchanger passed and rinsed the treated surface.
  • Samples a) were made of ferritic chrome steel at room temperature (290 to 295 K) during 16 hours with a solution of 0.05 mol each Chromic and permanganic acid treated. After a Intermediate rinsing became a decontamination factor (Ratio of measured activity before and after treatment) determined from 2.
  • Samples a) made of ferritic chrome steel, samples b) austenitic stainless steels and samples c) from INCOLOY 800 and from INCONEL 600 were each at room temperature for 16 hours in aqueous solutions with 0.01 to 0.1 mol Chromic acid and 0.001 to 0.05 mol permanganic acid treated, the ratio of chromic acid to permanganic acid was between 1:10 and 25: 1.
  • the samples were then each during 6 Hours at room temperature in an aqueous Solution with 0.1 mol oxalic acid under the influence of ultrasound treated further. Finally were on all samples, depending on the oxidative treatment and from the sample material, decontamination factors measured between 10 and 1000.
  • Samples a) made of ferritic chromium steel and samples c) made from INCONEL 600 were each treated for 16 hours at room temperature in a solution with 0.1 mol of chromic acid and 0.05 mol of permanganic acid. After a subsequent treatment with a water jet of 2.4 kbar (240 Pa) pressure at a treatment speed of 3.6 m 2 / hour, decontamination factors of about 30 were obtained on samples a) made of ferritic chromium steel and 600 decontamination factors of on samples c) from INCONEL measured over 100. Extensive follow-up examinations showed that these treatments did not attack the surfaces of the base materials.
  • Samples c) from INCONEL 600 were during 16 hours at room temperature with a solution of 0.05 mol of chromic acid and 0.002 mol of permanganic acid sprayed. After a further one Treatment with a water jet, as in the Example 4, decontamination factors were between 20 and 80 determined.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Food Science & Technology (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Chemical Treatment Of Metals (AREA)

Claims (5)

  1. Procédé de décontamination de surfaces, en particulier sur des pièces constitutives de circuits de refroidissement de réacteurs nucléaires, dans lequel, dans une première étape de traitement, on utilise un oxydant pour désagréger les couches superficielles contaminées par radioactivité, et dans une seconde étape de traitement, on enlève les couches superficielles désagrégées à l'aide d'un réducteur ajouté à l'oxydant, procédé caractérisé en ce que l'on utilise, comme oxydant, une solution de décontamination contenant de l'acide chromique et de l'acide permanganique ou de leurs sels, la solution de décontamination ne contenant pas d'ozone.
  2. Procédé selon la revendication 1, caractérisé en ce que l'on réalise la première et/ou la seconde étape de traitement sous l'action d'ultrasons.
  3. Procédé selon la revendication 1, caractérisé en ce que, dans la deuxième étape de traitement, les couches superficielles sont enlevées par voie mécanique ou par voie hydraulique.
  4. Procédé selon la revendication 1, caractérisé en ce que l'on ajoute des acides organiques et/ou des agents complexants à la solution de décontamination à laquelle on a ajouté le réducteur.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que, à la suite de la deuxième étape de traitement, on réutilise la solution de décontamination, après l'avoir fait passer sur un échangeur d'ions, pour rincer les surfaces traitées.
EP88116003A 1987-10-02 1988-09-28 Procédé pour décontaminer des surfaces Expired - Lifetime EP0313843B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3846/87A CH673545A5 (fr) 1987-10-02 1987-10-02
CH3846/87 1987-10-02

Publications (3)

Publication Number Publication Date
EP0313843A1 EP0313843A1 (fr) 1989-05-03
EP0313843B1 EP0313843B1 (fr) 1992-07-08
EP0313843B2 true EP0313843B2 (fr) 1998-05-13

Family

ID=4264738

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88116003A Expired - Lifetime EP0313843B2 (fr) 1987-10-02 1988-09-28 Procédé pour décontaminer des surfaces

Country Status (8)

Country Link
US (1) US5093073A (fr)
EP (1) EP0313843B2 (fr)
JP (1) JPH02503600A (fr)
KR (1) KR970011260B1 (fr)
CH (1) CH673545A5 (fr)
DE (1) DE3872656D1 (fr)
ES (1) ES2034088T5 (fr)
WO (1) WO1989003113A1 (fr)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4913849A (en) * 1988-07-07 1990-04-03 Aamir Husain Process for pretreatment of chromium-rich oxide surfaces prior to decontamination
DE4232246A1 (de) * 1992-09-25 1994-03-31 Siemens Ag Verfahren zur Zerstörung einer organischen Substanz
US5278743A (en) * 1992-11-20 1994-01-11 Westinghouse Electric Corp. Alkaline-permanganate process
FR2730641B1 (fr) * 1995-02-20 1997-03-14 Commissariat Energie Atomique Mousse de decontamination a l'ozone, et procede de decontamination utilisant cette mousse
US5678232A (en) * 1995-07-31 1997-10-14 Corpex Technologies, Inc. Lead decontamination method
US5591270A (en) * 1995-07-31 1997-01-07 Corpex Technologies, Inc. Lead oxide removal method
ATE209438T1 (de) * 1996-02-07 2001-12-15 Buckman Labor Inc Synergistische antimikrobielle zusammensetzungen, die ein ionene-polymer und ein dodecylaminsalz enthalten und verfahren zu ihrer verwendung
US5814204A (en) * 1996-10-11 1998-09-29 Corpex Technologies, Inc. Electrolytic decontamination processes
US6183547B1 (en) * 1998-03-05 2001-02-06 The University Of Notre Dame Du Lac Environmentally acceptable inhibitor formulations for metal surfaces
JP2001124891A (ja) * 1999-07-09 2001-05-11 Hitachi Ltd 原子力プラント構造物の表面処理方法および原子力プラント
JP3977963B2 (ja) 1999-09-09 2007-09-19 株式会社日立製作所 化学除染方法
FR2841802B1 (fr) * 2002-07-08 2005-03-04 Commissariat Energie Atomique Composition, mousse et procede de decontamination de surfaces
KR100724710B1 (ko) * 2002-11-21 2007-06-04 가부시끼가이샤 도시바 방사화 부품의 화학적 오염제거 시스템 및 방법
KR20040077390A (ko) * 2003-02-28 2004-09-04 김성진 핵 방사능 잡 고체, 시멘트, 농축 폐 액 드럼을 천일염수와 천일염으로 절게 하여 고온으로 소각시켜 핵 방사능독을 흔적없이 공중 완전 소각 방법과, 농축 천일염(수)폐액 드럼.
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
DE102009047524A1 (de) * 2009-12-04 2011-06-09 Areva Np Gmbh Verfahren zur Oberflächen-Dekontamination
DE102010028457A1 (de) * 2010-04-30 2011-11-03 Areva Np Gmbh Verfahren zur Oberflächen-Dekontamination
DE102013108802A1 (de) * 2013-08-14 2015-02-19 Areva Gmbh Verfahren zur Verringerung der radioaktiven Kontamination eines wasserführenden Kreislaufs eines Kernkraftwerks
US9947425B2 (en) * 2013-08-14 2018-04-17 Areva Gmbh Method for reducing the radioactive contamination of the surface of a component used in a nuclear reactor
US9440847B2 (en) * 2013-10-03 2016-09-13 POSiFA MICROSYSTEMS, INC. Single silicon wafer micromachined thermal conduction sensor

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3615817A (en) * 1969-02-04 1971-10-26 Atomic Energy Commission Method of decontaminating radioactive metal surfaces
US4217192A (en) * 1979-06-11 1980-08-12 The United States Of America As Represented By The United States Department Of Energy Decontamination of metals using chemical etching
ATE18822T1 (de) * 1981-06-17 1986-04-15 Central Electr Generat Board Verfahren zur chemischen zersetzung von oxydniederschlaegen.
US4522928A (en) * 1982-10-18 1985-06-11 Exxon Research And Engineering Co. Removal of metal comtaminants from catalysts using buffered oxalic acid
SE435329B (sv) * 1983-02-09 1984-09-17 Studsvik Energiteknik Ab Dekontaminering av tryckvattenreaktorer
DE3413868A1 (de) * 1984-04-12 1985-10-17 Kraftwerk Union AG, 4330 Mülheim Verfahren zur chemischen dekontamination von metallischen bauteilen von kernreaktoranlagen
US4913849A (en) * 1988-07-07 1990-04-03 Aamir Husain Process for pretreatment of chromium-rich oxide surfaces prior to decontamination

Also Published As

Publication number Publication date
JPH02503600A (ja) 1990-10-25
CH673545A5 (fr) 1990-03-15
EP0313843B1 (fr) 1992-07-08
ES2034088T5 (es) 1998-10-01
KR970011260B1 (ko) 1997-07-08
KR890702211A (ko) 1989-12-23
WO1989003113A1 (fr) 1989-04-06
DE3872656D1 (de) 1992-08-13
EP0313843A1 (fr) 1989-05-03
US5093073A (en) 1992-03-03
ES2034088T3 (es) 1993-04-01

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