EP0313843B2 - Verfahren zur Dekontamination von Oberflächen - Google Patents
Verfahren zur Dekontamination von Oberflächen Download PDFInfo
- 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
Links
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)
Description
Claims (5)
- Verfahren zur Dekontamination von Oberflächen, insbesondere an Bestandteilen von Kühlkreisläufen von Kernreaktoren, wobei in einem ersten Behandlungsschritt zur Auflockerung der radioaktiv kontaminierten Oberflächenschichten ein Oxidationsmittel aufgebracht wird und in einem zweiten Behandlungsschritt die aufgelockerten Oberflächenschichten mit Hilfe eines dem Oxidationsmittel zugesetzten Reduktionsmittels entfernt werden, dadurch gekennzeichnet, daß als Oxidationsmittel eine Chromsäure und Permangansäure oder deren Salze enthaltende Dekontaminationslösung verwendet wird, wobei die Dekontaminationslösung kein Ozon enthält.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der erste und/oder zweite Behandlungsschritt unter Ultraschalleinwirkung durchgeführt wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß im zweiten Behandlungsschritt die Oberflächenschicht mechanisch oder hydraulisch abgetragen werden.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der mit den Reduktionsmitteln versetzten Dekontaminationslösung organische Säuren und/oder Komplexbildner zugesetzt werden.
- Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß an den zweiten Behandlungsschritt anschließend die Dekontaminationslösung im Kreislauf über einen lonaustauscher geleitet wird und dabei die behandelnden Oberflächen gespült werden.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH3846/87A CH673545A5 (de) | 1987-10-02 | 1987-10-02 | |
CH3846/87 | 1987-10-02 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0313843A1 EP0313843A1 (de) | 1989-05-03 |
EP0313843B1 EP0313843B1 (de) | 1992-07-08 |
EP0313843B2 true EP0313843B2 (de) | 1998-05-13 |
Family
ID=4264738
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88116003A Expired - Lifetime EP0313843B2 (de) | 1987-10-02 | 1988-09-28 | Verfahren zur Dekontamination von Oberflächen |
Country Status (8)
Country | Link |
---|---|
US (1) | US5093073A (de) |
EP (1) | EP0313843B2 (de) |
JP (1) | JPH02503600A (de) |
KR (1) | KR970011260B1 (de) |
CH (1) | CH673545A5 (de) |
DE (1) | DE3872656D1 (de) |
ES (1) | ES2034088T5 (de) |
WO (1) | WO1989003113A1 (de) |
Families Citing this family (20)
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)
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 |
-
1987
- 1987-10-02 CH CH3846/87A patent/CH673545A5/de not_active IP Right Cessation
-
1988
- 1988-09-28 DE DE8888116003T patent/DE3872656D1/de not_active Expired - Fee Related
- 1988-09-28 JP JP88508032A patent/JPH02503600A/ja active Pending
- 1988-09-28 US US07/397,440 patent/US5093073A/en not_active Expired - Fee Related
- 1988-09-28 EP EP88116003A patent/EP0313843B2/de not_active Expired - Lifetime
- 1988-09-28 ES ES88116003T patent/ES2034088T5/es not_active Expired - Lifetime
- 1988-09-28 KR KR1019890700977A patent/KR970011260B1/ko active IP Right Grant
- 1988-09-28 WO PCT/EP1988/000870 patent/WO1989003113A1/de unknown
Also Published As
Publication number | Publication date |
---|---|
JPH02503600A (ja) | 1990-10-25 |
CH673545A5 (de) | 1990-03-15 |
EP0313843B1 (de) | 1992-07-08 |
ES2034088T5 (es) | 1998-10-01 |
KR970011260B1 (ko) | 1997-07-08 |
KR890702211A (ko) | 1989-12-23 |
WO1989003113A1 (en) | 1989-04-06 |
DE3872656D1 (de) | 1992-08-13 |
EP0313843A1 (de) | 1989-05-03 |
US5093073A (en) | 1992-03-03 |
ES2034088T3 (es) | 1993-04-01 |
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