DE2058766A1 - Removing radioactive contaminations from metallic surfaces - - by means of a jet of comminuted ice or solidified carbon dioxide - Google Patents

Removing radioactive contaminations from metallic surfaces - - by means of a jet of comminuted ice or solidified carbon dioxide

Info

Publication number
DE2058766A1
DE2058766A1 DE19702058766 DE2058766A DE2058766A1 DE 2058766 A1 DE2058766 A1 DE 2058766A1 DE 19702058766 DE19702058766 DE 19702058766 DE 2058766 A DE2058766 A DE 2058766A DE 2058766 A1 DE2058766 A1 DE 2058766A1
Authority
DE
Germany
Prior art keywords
metallic surfaces
jet
carbon dioxide
ice
removing radioactive
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.)
Pending
Application number
DE19702058766
Other languages
German (de)
Inventor
Axel Bergbauer
Dieter Harms
Guenter Dipl-Ing Seyd
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
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 Siemens AG filed Critical Siemens AG
Priority to DE19702058766 priority Critical patent/DE2058766A1/en
Priority to JP9570871A priority patent/JPS5380B1/ja
Publication of DE2058766A1 publication Critical patent/DE2058766A1/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/003—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods using material which dissolves or changes phase after the treatment, e.g. ice, CO2

Abstract

Removal of impurities is effected in the stream of water from melting ice or in the stream of gasified CO2 so that substances which remain solid, such as sand, are not introduced into the system. The method is suitable e.g. for cleaning of steam generators in nuclear reactors.

Description

Verfahren zur Reinigung von metallischen Oberflächen, insbesondere radioaktiv verseuchten Oberflächen Die Erfindung betrifft ein Verfahren zur Reinigung von metallischen Oberflächen, insbesondere radioaktiv verseuchten metallischen Oberflächen, mittels eines feinkörnige Festkörper enthaltenden Förderstrahle.Process for cleaning metallic surfaces, in particular Radioactively contaminated surfaces The invention relates to a method for cleaning of metallic surfaces, especially radioactively contaminated metallic surfaces, by means of a conveyor jet containing fine-grained solids.

Das bekannte Sandstrahlverfahren zur Reinigung von metallischen Oberflächen, beispielsweise zur Beseitigung von Oxydschichten, von Walzhäuten oder von Sandrückständen an Gußteilen,'hat den Nachteil, daß dieses Verfahren nicht in geschlossenen Räumen angewendet werden kann, und daß nach der Reinigung erhebliche Mengen mit Abfall stoffen vermischten Sandes anfallen und entfernt oder aufbereitet werden müssen. Handelt es sich bei den zu reinigenden Oberflächen um radioaktiv verseuchte Oberflächen, beisRelsweise um die Reinigung eines Dampferzeugers aus einer Kernreaktoranlage, so ist die Beseitigung des mit Abfallstoffen vermischten Sandes mit einer Gefährdung des Personals durch Strahlenbelastung verbunden.The well-known sandblasting process for cleaning metallic surfaces, for example to remove oxide layers, rolled skins or sand residues on castings, 'has the disadvantage that this process cannot be used in closed rooms can be applied, and that after cleaning, significant amounts of waste material mixed sand accumulate and must be removed or processed. If the surfaces to be cleaned are radioactively contaminated surfaces, For example, the cleaning of a steam generator from a nuclear reactor plant, so the disposal of the sand mixed with waste materials is a hazard of the staff connected by radiation exposure.

Zur Vermeidung dieser Nachteile wird gemäß der Erfindung vorgeschlagen, Eisgranulate als feinkörnige Festkörper zu verwenden.To avoid these disadvantages, it is proposed according to the invention, To use ice granules as fine-grained solids.

Wegen der erforderlichen Härte des Granulates wird vorzugsweise Wasser in festem Aggregatzustand verwendet. Bei leicht löslichen, die Oberflächen verunreinigenden Niederschlägen ist jedoch auch die Verwendung von Kchlendioxyd in festem Aggregatzustand möglich.Because of the required hardness of the granulate, water is preferred used in solid aggregate state. For easily soluble ones that contaminate the surfaces Precipitation, however, is also the use of calcium dioxide in its solid state possible.

Durch die Verwendung von Eisgranulat ergibt sich eine wesentliche Vereinfachung in der Beseitigung der von den Oberflächen enternten Stoffe, da diese mit der durch das Auftauen des Eises anfallenden Flüssigkeit abgeführt werden können Außerdem tritt keine Verunreinigung eines Anlagenkreislaufes, beispielsweise bei einem Dampferzeuger, durch kreislauffremde Feststoffe ein, die Schaden anrichten könnten, auch wenn sie nur in geringen Mengen zurückbleiben. Ferner wird die Gefahr einer Strahlenbelastung des Personals bei einer Reinigung von radioaktiv verseuchten Oberflächen beseitigt oder zumindest erheblich vermindert. Die Verwendung von Trockeneis (wo2) bietet den Vorteil, daß dieses unmittelbar vom festen in den gasförmigen Aggregatzustand übergeht.The use of ice granulate results in an essential one Simplification in the elimination of the substances removed from the surfaces, since these can be removed with the liquid resulting from the thawing of the ice aside from that there is no contamination of a system circuit, for example in the case of a steam generator, from non-circulating solids that could cause damage, even if they do only remain in small quantities. Furthermore, there is a risk of radiation exposure of the personnel when cleaning radioactively contaminated surfaces or at least considerably reduced. The use of dry ice (wo2) provides the advantage that this changes directly from the solid to the gaseous state of aggregation transforms.

2 Patentansprüche2 claims

Claims (2)

Patentansprüche %eraren zur Verfahren zur Reinigung von metallischen Oberflächen, insbesondere von radioaktiv verseuchten metallischen Oberflächen, mittels eines feinkörnige Festkörper enthaltenden Förderstrahls, gekennzeichnet durch die Verwendung von Eisgranulat als feinkörnige Festkörper.Patent claims% eraren for the method for cleaning metallic Surfaces, in particular of radioactively contaminated metallic surfaces, by means of a conveying jet containing fine-grained solids, characterized by the Use of ice granules as fine-grained solids. 2. Verfahren nach Anspruch 1, gekennzeichnet durch die Verwendung von Trockeneisgranulat.2. The method according to claim 1, characterized by the use of dry ice granulate.
DE19702058766 1970-11-30 1970-11-30 Removing radioactive contaminations from metallic surfaces - - by means of a jet of comminuted ice or solidified carbon dioxide Pending DE2058766A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19702058766 DE2058766A1 (en) 1970-11-30 1970-11-30 Removing radioactive contaminations from metallic surfaces - - by means of a jet of comminuted ice or solidified carbon dioxide
JP9570871A JPS5380B1 (en) 1970-11-30 1971-11-27

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702058766 DE2058766A1 (en) 1970-11-30 1970-11-30 Removing radioactive contaminations from metallic surfaces - - by means of a jet of comminuted ice or solidified carbon dioxide

Publications (1)

Publication Number Publication Date
DE2058766A1 true DE2058766A1 (en) 1972-05-31

Family

ID=5789461

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19702058766 Pending DE2058766A1 (en) 1970-11-30 1970-11-30 Removing radioactive contaminations from metallic surfaces - - by means of a jet of comminuted ice or solidified carbon dioxide

Country Status (2)

Country Link
JP (1) JPS5380B1 (en)
DE (1) DE2058766A1 (en)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2543019A1 (en) * 1974-09-27 1976-04-08 Lockheed Aircraft Corp SANDBASING METHOD AND EQUIPMENT FOR IMPLEMENTING IT
FR2475425A1 (en) * 1980-02-08 1981-08-14 Reel Sa Cleaner for external aircraft surfaces - combines compressed air with water and coolant to produce stream of ice particles
US4496519A (en) * 1981-03-09 1985-01-29 Mcguire Paul J Nuclear reactor vessel decontamination systems
FR2551368A1 (en) * 1983-09-01 1985-03-08 Doryokuro Kakunenryo CLEANING METHOD AND APPARATUS
US4534932A (en) * 1983-06-03 1985-08-13 Hitachi, Ltd Apparatus for removing cladding material from bottom portion of control rod guide tube of nuclear reactor
EP0164914A1 (en) * 1984-05-15 1985-12-18 N.I.S. Engineering Limited Jet cleaning operation
EP0192088A1 (en) * 1985-02-19 1986-08-27 Ernst Manfred Küntzel GmbH Malereibetrieb Method of removing surfaces
EP0194121A1 (en) * 1985-03-02 1986-09-10 Kue Engineering Limited Blast cleaning
WO1986007184A1 (en) * 1985-05-28 1986-12-04 Jozef Hanulik Agent for decontaminating contaminated metal materials or cement-containing materials, production method and utilization
EP0316264A2 (en) * 1987-11-11 1989-05-17 Werner & Zeisse GmbH & Co. Method and device for stripping enamel and for removing layers from surfaces
US5128266A (en) * 1989-06-30 1992-07-07 Firma Recytec Sa Method for testing the radioactivity of objects containing metal or concrete
USRE34613E (en) * 1985-05-28 1994-05-24 Recytec Sa Process for decontaminating radioactively contaminated metal or cement-containing materials
US5340505A (en) * 1990-10-26 1994-08-23 Recytec Sa Method for dissolving radioactively contaminated surfaces from metal articles
DE19639437A1 (en) * 1996-09-25 1998-04-02 Siemens Ag Cleaning or roughening metal surface especially relay contact
WO2001076778A1 (en) * 2000-04-05 2001-10-18 Ag-Tech Aps Apparatus for surface treatment and use of the apparatus
DE102004060884A1 (en) * 2004-12-17 2006-06-29 Clyde Bergemann Gmbh Method for removing of combustion residues from wall of chamber carrying combustion gases involves contacting of combustion residues with first cleaning medium, and contacting of pre-treated residues with second cleaning medium

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2543019A1 (en) * 1974-09-27 1976-04-08 Lockheed Aircraft Corp SANDBASING METHOD AND EQUIPMENT FOR IMPLEMENTING IT
FR2475425A1 (en) * 1980-02-08 1981-08-14 Reel Sa Cleaner for external aircraft surfaces - combines compressed air with water and coolant to produce stream of ice particles
US4496519A (en) * 1981-03-09 1985-01-29 Mcguire Paul J Nuclear reactor vessel decontamination systems
US4534932A (en) * 1983-06-03 1985-08-13 Hitachi, Ltd Apparatus for removing cladding material from bottom portion of control rod guide tube of nuclear reactor
FR2551368A1 (en) * 1983-09-01 1985-03-08 Doryokuro Kakunenryo CLEANING METHOD AND APPARATUS
EP0164914A1 (en) * 1984-05-15 1985-12-18 N.I.S. Engineering Limited Jet cleaning operation
EP0192088A1 (en) * 1985-02-19 1986-08-27 Ernst Manfred Küntzel GmbH Malereibetrieb Method of removing surfaces
EP0194121A1 (en) * 1985-03-02 1986-09-10 Kue Engineering Limited Blast cleaning
WO1986005136A1 (en) * 1985-03-02 1986-09-12 Kue Engineering Limited Blast cleaning
US4828759A (en) * 1985-05-28 1989-05-09 Jozef Hanulik Process for decontaminating radioactivity contaminated metallic materials
WO1986007184A1 (en) * 1985-05-28 1986-12-04 Jozef Hanulik Agent for decontaminating contaminated metal materials or cement-containing materials, production method and utilization
US4933113A (en) * 1985-05-28 1990-06-12 Recytec Sa Process for the processing of contaminated boric acid
US5008044A (en) * 1985-05-28 1991-04-16 Recytec Sa Process for decontaminating radioactively contaminated metal or cement-containing materials
USRE34613E (en) * 1985-05-28 1994-05-24 Recytec Sa Process for decontaminating radioactively contaminated metal or cement-containing materials
EP0316264A2 (en) * 1987-11-11 1989-05-17 Werner & Zeisse GmbH & Co. Method and device for stripping enamel and for removing layers from surfaces
EP0316264A3 (en) * 1987-11-11 1989-12-13 Howaldtswerke-Deutsche Werft Ag Method and device for stripping enamel and for removing layers from surfaces
US5128266A (en) * 1989-06-30 1992-07-07 Firma Recytec Sa Method for testing the radioactivity of objects containing metal or concrete
US5340505A (en) * 1990-10-26 1994-08-23 Recytec Sa Method for dissolving radioactively contaminated surfaces from metal articles
DE19639437A1 (en) * 1996-09-25 1998-04-02 Siemens Ag Cleaning or roughening metal surface especially relay contact
WO2001076778A1 (en) * 2000-04-05 2001-10-18 Ag-Tech Aps Apparatus for surface treatment and use of the apparatus
DE102004060884A1 (en) * 2004-12-17 2006-06-29 Clyde Bergemann Gmbh Method for removing of combustion residues from wall of chamber carrying combustion gases involves contacting of combustion residues with first cleaning medium, and contacting of pre-treated residues with second cleaning medium
US7767027B2 (en) 2004-12-17 2010-08-03 Clyde Bergemann Gmbh Method and apparatus for removing combustion residues using different cleaning media

Also Published As

Publication number Publication date
JPS5380B1 (en) 1978-01-05

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