EP0083525B1 - Procédé de décontamination d'une cavité fermée contenant des poussiéres toxiques - Google Patents

Procédé de décontamination d'une cavité fermée contenant des poussiéres toxiques Download PDF

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Publication number
EP0083525B1
EP0083525B1 EP82402331A EP82402331A EP0083525B1 EP 0083525 B1 EP0083525 B1 EP 0083525B1 EP 82402331 A EP82402331 A EP 82402331A EP 82402331 A EP82402331 A EP 82402331A EP 0083525 B1 EP0083525 B1 EP 0083525B1
Authority
EP
European Patent Office
Prior art keywords
cavity
solvent
product
enclosure
interior
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
Application number
EP82402331A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0083525A1 (fr
Inventor
Pierre Raymond Auchapt
Aimé Joannes Ferlay
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.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
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 Commissariat a lEnergie Atomique CEA filed Critical Commissariat a lEnergie Atomique CEA
Publication of EP0083525A1 publication Critical patent/EP0083525A1/fr
Application granted granted Critical
Publication of EP0083525B1 publication Critical patent/EP0083525B1/fr
Expired legal-status Critical Current

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/22—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
    • B05D3/0493—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases using vacuum

Definitions

  • the present invention relates to a method for decontaminating a closed cavity containing toxic dust, by fixing this dust using a product which can adhere to the surfaces of the cavity.
  • a cavity contaminated by a toxic product such as a radioactive product must be decontaminated before being placed in communication with the atmosphere. This is particularly the case of the cavity defined between the cap of a container for transporting toxic products and the cap of a filling or emptying enclosure, after the head of the container has been coupled to the enclosure. If this cavity can be decontaminated by circulating freon at high speed or agitate by ultrasound, as taught by French Patent No. 2,352,377 of May 21, 1976, there remains on the walls residual contamination in the form of dust toxic and it is advantageous, according to the invention, to fix this dust by means of a film of a suitable product in order to avoid their dispersion in the atmosphere.
  • the present invention specifically relates to a method for decontaminating the surfaces of a closed cavity such as the cavity formed between the plugs of an enclosure and of a container containing toxic products before their uncoupling and the arrival of these surfaces in contact with the atmosphere.
  • the vaporization of the solvent can be obtained either by creating a vacuum, or by circulating air inside the cavity.
  • the product used is preferably constituted by a silicone grease and the solvent is preferably constituted by freon.
  • This enclosure can be either an enclosure in which this product is produced, or a storage enclosure, or an enclosure in which this product is treated.
  • the wall 10 of the enclosure separates the contaminated internal zone 10a from the inactive external zone 106.
  • it is necessary to provide means for ensuring the entry or exit of the product in a container 12 allowing its transport between two enclosures such as a storage enclosure and a processing enclosure.
  • an airlock 14 which comprises a cylindrical shell 16 secured in leaktight manner to the enclosure 10 and a plug 18 sealingly sealing, for example by means of a seal 20, the end of the shell 16 placed inside the enclosure 10.
  • the other end of the shell 16 is normally closed by a cover 22 when no container is coupled to the enclosure 10.
  • An ultrasonic transducer can be accommodated in the cap 18.
  • the container 12 is placed in a handling package 24 which can be coupled to the enclosure 10 opposite the airlock 14, for example by means of a bayonet fixing ring 26.
  • a handling package 24 which can be coupled to the enclosure 10 opposite the airlock 14, for example by means of a bayonet fixing ring 26.
  • the container 12 is housed at the interior of the packaging 24 and the latter is closed on the side of the locking member 26 by a cover 28.
  • the container 12 is itself closed on the side of the cover 28 by a plug 30 fitted with a seal suitable seal 32.
  • the packaging 24 is coupled to the enclosure 10 by means of the crown 26.
  • the lids 22 and 28 are then opened and the container 12 is brought to inside the airlock 14 and fixed in the shell 16 by means (not shown) such as by screwing.
  • a seal 34 ensures a perfect seal between the end of the container surrounding the plug 30 and the surface facing the ferrule 16.
  • the plug 18, then the plug 30 are then removed and the container filled or emptied, operating in the contaminated enclosure.
  • the cap 30 of the container, then the cap 18 of the airlock, are replaced. Due to the nature of the products contained in enclosure 10 and in the storyteller 12, it can be seen that the cavity C defined between the plugs 18 and 30 is contaminated. Since the air contained in this cavity can come into contact with external surfaces of the enclosure or of the container during the uncoupling operation, it is necessary to decontaminate the cavity C.
  • this decontamination can be carried out by circulating freon agitated by ultrasound in this cavity, as taught by French patent No. 2352377 of May 21, 1975.
  • this operation residual contamination remains walls of cavity C, which may cause a dispersion of toxic dust during the uncoupling operation. If this dispersion is tolerable from the point of view of generally accepted atmospheric contamination criteria, it is nevertheless desirable to avoid it.
  • means for decontamination by freon agitated by ultrasound (not shown in the figure in order to facilitate understanding of the invention) means for remotely depositing a film of '' a product fixing toxic dust on the walls of cavity C.
  • These means comprise at least one inlet conduit 36 and at least one outlet conduit 38 passing through the ferrule 16 to open into the cavity C.
  • this product is dissolved in a solvent capable of wetting the walls of the cavity C, the solution thus obtained is injected through the conduit 36 into the cavity C, after having closed the conduit outlet 38 and the solvent is vaporized so as to fix part of the product introduced into solution in the cavity C on the walls of this cavity and in particular on the surfaces S 1 and S z .
  • This vaporization can be done either by circulating air in the cavity, or by creating a vacuum.
  • the product used to fix toxic dust on the walls may be a silicone grease.
  • This product has the double advantage of easily adhering to surfaces and of being able to withstand temperatures above 150 ° C.
  • the solvent may in particular consist of freon or any other organic solvent constituting a wetting agent whose boiling temperature is between 0 ° C and 70 ° C.
  • freon R113 is justified in the application considered by the fact that it contains neutron-absorbing chlorine and that it is inert.
  • freon R113 is a good wetting agent and has a very low boiling temperature (45 ° C) and a vapor pressure of about 0.4 bar at 20 ° C, which allows it to be easily vaporized without heating .
  • the entire circuit constituted by the conduits 36 and 38 and by the cavity C defining a volume of approximately 0.5 l, 200 g of silicone grease dissolved in 1.5 l of freon will be used as an example. Thanks to this process, a regular film of silicone grease is produced, the regular thickness of which can be between 0.3 and 1 mm. The regularity and thickness of this film makes it possible to fix practically all of the dust contaminating the walls of the cavity C.
  • the surface S 2 of the plug is cleaned by filling the cavity C with freon and evacuating the solution thus obtained before opening the plugs.
  • the surface Si of the enclosure is cleaned in the same way when another container is coupled to the enclosure 10.
  • the invention is not limited to the embodiment which has just been described by way of example, but covers all its variants.
  • the invention applies to any coating at a distance from the surfaces of a cavity using a product adhering to these surfaces.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Food Science & Technology (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Cleaning By Liquid Or Steam (AREA)
EP82402331A 1981-12-24 1982-12-17 Procédé de décontamination d'une cavité fermée contenant des poussiéres toxiques Expired EP0083525B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8124221 1981-12-24
FR8124221A FR2518904A1 (fr) 1981-12-24 1981-12-24 Procede pour deposer a distance un produit sur une surface et son application a la fixation de poussieres toxiques sur les parois d'une cavite contaminee

Publications (2)

Publication Number Publication Date
EP0083525A1 EP0083525A1 (fr) 1983-07-13
EP0083525B1 true EP0083525B1 (fr) 1985-09-18

Family

ID=9265397

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82402331A Expired EP0083525B1 (fr) 1981-12-24 1982-12-17 Procédé de décontamination d'une cavité fermée contenant des poussiéres toxiques

Country Status (4)

Country Link
US (1) US4504524A (enrdf_load_stackoverflow)
EP (1) EP0083525B1 (enrdf_load_stackoverflow)
DE (1) DE3266440D1 (enrdf_load_stackoverflow)
FR (1) FR2518904A1 (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2638451B1 (fr) * 1988-11-03 1993-12-03 Ruggieri Procede de realisation d'un conduit de transmission de feu et conduit obtenu par ce procede
JP4344760B2 (ja) * 2007-06-15 2009-10-14 シャープ株式会社 固体撮像装置およびそれを備えた電子機器
JP4344761B2 (ja) * 2007-06-15 2009-10-14 シャープ株式会社 固体撮像装置およびそれを備えた電子機器

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR843102A (fr) * 1937-09-22 1939-06-26 Paul Lechler Procédé pour la protection de capacités inaccessibles
GB1081111A (en) * 1965-01-11 1967-08-31 Hooker Chemical Corp Method of applying coatings
US3592763A (en) * 1968-02-21 1971-07-13 Hydronautics Dynamically formed,reverse osmosis membranes
DE1771564B1 (de) * 1968-06-08 1971-10-07 Wolff Walsrode Ag Verfahren und Vorrichtung zur Herstellung von beidseitig beschichteten Schlaeuchen
US3669721A (en) * 1969-02-21 1972-06-13 Wolff Walsrode Ag Process for the continuous production of coated tubular structures
US3740251A (en) * 1969-03-20 1973-06-19 Westinghouse Electric Corp Method of uniformly coating a tubular lamp envelope with phosphor
FR2094684A5 (enrdf_load_stackoverflow) * 1970-06-30 1972-02-04 Loire Atel Forges
AU469858B2 (en) * 1972-03-23 1976-02-26 Method for coating surfaces
FR2352377A1 (fr) * 1976-05-21 1977-12-16 Commissariat Energie Atomique Installation pour le transfert dans un conteneur d'un produit toxique, notamment d'un produit radioactif a haut pouvoir de contamination, et conteneur adapte a la mise en oeuvre de cette installation
FR2380624A1 (fr) * 1977-02-09 1978-09-08 Commissariat Energie Atomique Procede de decontamination radioactive d'une piece
GB2057917A (en) * 1979-09-07 1981-04-08 Oakes Ltd E T A method of coating the interior surface of a pipe
DE3020092A1 (de) * 1980-05-27 1981-12-10 Basf Ag, 6700 Ludwigshafen Acylphosphinverbindungen und ihre verwendung

Also Published As

Publication number Publication date
FR2518904A1 (fr) 1983-07-01
EP0083525A1 (fr) 1983-07-13
US4504524A (en) 1985-03-12
DE3266440D1 (en) 1985-10-24
FR2518904B1 (enrdf_load_stackoverflow) 1985-05-17

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