EP0083525A1 - Method of decontaminating a closed cavity containing toxic dust - Google Patents

Method of decontaminating a closed cavity containing toxic dust Download PDF

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Publication number
EP0083525A1
EP0083525A1 EP82402331A EP82402331A EP0083525A1 EP 0083525 A1 EP0083525 A1 EP 0083525A1 EP 82402331 A EP82402331 A EP 82402331A EP 82402331 A EP82402331 A EP 82402331A EP 0083525 A1 EP0083525 A1 EP 0083525A1
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EP
European Patent Office
Prior art keywords
cavity
solvent
product
enclosure
container
Prior art date
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Granted
Application number
EP82402331A
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German (de)
French (fr)
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EP0083525B1 (en
Inventor
Pierre Raymond Auchapt
Aimé Joannes Ferlay
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Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
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Commissariat a lEnergie Atomique CEA
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Publication of EP0083525A1 publication Critical patent/EP0083525A1/en
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    • 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 process for remotely coating the surfaces of a cavity using a product which can adhere to these surfaces, as well as to the application of this process to the fixing of toxic dust on the walls of a cavity defined between the plugs of two sealed enclosures containing toxic products, before the uncoupling of these enclosures.
  • the present invention specifically relates to a method for coating at a distance surfaces such as the surfaces of the cavity formed between the plugs of an enclosure and a container containing toxic products before their uncoupling and the coming of these surfaces in contact with the atmosphere.
  • the subject of the invention is also a process for remotely coating all surfaces placed in a closed cavity, using a product which can adhere to these surfaces.
  • the vaporization of the solvent can be obtained either by creating a vacuum, or by circulating air inside the cavity.
  • the product used preferably consists of a grease silicone and the solvent preferably consists of 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 ferrule 16 is normally closed by a cover 22 when no container is coupled to the enclosure 10.
  • An ultrasonic transducer can be housed 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 package 24 and the latter is closed on the side of the locking ring 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 filling or emptying of the container made, 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 the enclosure 10 and in the container 12, it can be understood 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 ultrasonically stirred freon in this cavity, as taught by French patent No. 2352377 of May 21, 1976.
  • 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 shell 16 to open into the cavity C.
  • this product is dissolved in a solvent capable of wetting the walls of cavity C, the solution thus obtained is injected through conduit 36 into cavity C, after having closed the conduit of 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 SI and s 2 .
  • 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 be constituted by freon or by any other organic solvent constituting a wetting agent, the boiling temperature of which 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 the variations thereof.
  • the invention applies to any coating at a distance from the surfaces of a cavity using a product adhering to these surfaces.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Food Science & Technology (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Cleaning By Liquid Or Steam (AREA)

Abstract

L'invention concerne un procédé pour revêtir à distance les surfaces (S1, S2) d'une cavité (C) à l'aide d'un produit pouvant adhérer sur ces surfaces et l'application de ce procédé à la fixation de poussières toxiques sur les surfaces d'une cavité définie entre les bouchons (18, 30) de deux enceintes (10,12) avant le désaccouplement de celles-ci.The invention relates to a method for remotely coating the surfaces (S 1 , S 2 ) of a cavity (C) using a product which can adhere to these surfaces and the application of this method to the fixing of toxic dust on the surfaces of a cavity defined between the plugs (18, 30) of two enclosures (10,12) before uncoupling them.

On dissout le produit dans un solvant, on remplit la cavité (C) de la solution obtenue et on vaporise le solvant soit en créant une dépression dans la cavité, soit en y faisant circuler de l'air. De préférence, on utilise une graisse silicone dissoute dans du fréon.The product is dissolved in a solvent, the cavity (C) is filled with the solution obtained and the solvent is vaporized either by creating a vacuum in the cavity, or by circulating air therein. Preferably, a silicone grease dissolved in freon is used.

Application aux manutentions de produits radioactifs à haut pouvoir contaminant.

Figure imgaf001
Application to the handling of radioactive products with high contaminating power.
Figure imgaf001

Description

La présente invention se rapporte à un procédé pour revêtir à distance les surfaces d'une cavité à l'aide d'un produit pouvant adhérer sur ces surfaces, ainsi qu'à l'application de ce procédé à la fixation de poussières toxiques sur les parois d'une cavité définie entre les bouchons de deux enceintes étanches contenant des produits toxiques, avant le désaccouplement de ces enceintes.The present invention relates to a process for remotely coating the surfaces of a cavity using a product which can adhere to these surfaces, as well as to the application of this process to the fixing of toxic dust on the walls of a cavity defined between the plugs of two sealed enclosures containing toxic products, before the uncoupling of these enclosures.

Dans certaines applications, on peut souhaiter revêtir les surfaces d'une cavité à l'aide d'un film d'un produit donné, sans qu'il soit possible d'avoir accès directement à cette surface.In certain applications, it may be desired to coat the surfaces of a cavity with a film of a given product, without it being possible to have direct access to this surface.

A titre d'exemple non limitatif, on citera le cas d'une cavité contaminée par un produit toxique tel qu'un produit radioactif et qui doit être décontaminée avant d'être mise en communication avec l'atmosphère. Tel est notamment le cas de la cavité définie entre le bouchon d'un conteneur de transport de produits toxiques et le bouchon d'une enceinte de remplissage ou de vidage, après que la tête du conteneur a été accouplée à l'enceinte. En effet, si cette cavité peut être décontaminée en y faisant circuler du fréon à grande vitesse ou agité par ultrasons, comme l'enseigne le brevet français n°2352377 du 21 mai 1976, il subsiste sur les parois une contamination résiduelle sous la forme de poussières toxiques et il est avantageux, conformément à l'invention, de fixer ces poussières au moyen d'un film d'un produit adéquat afin d'éviter leur dispersion dans l'atmosphère.By way of nonlimiting example, mention will be made of the case of a cavity contaminated by a toxic product such as a radioactive product and which 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. Indeed, if this cavity can be decontaminated by circulating freon at high speed or agitated by ultrasound, as taught by French patent n ° 2352377 of May 21, 1976, there remains on the walls a residual contamination in the form of toxic dust and it is advantageous, according to the invention, to fix this dust by means of a film of an adequate product in order to avoid their dispersion in the atmosphere.

La présente invention a précisément pour objet un procédé permettant de revêtir à distance des surfaces telles que les surfaces de la cavité formée entre les bouchons d'une enceinte et d'un conteneur contenant des produits toxiques avant leur désaccouplement et la venue de ces surfaces en contact avec l'atmosphère. Toutefois, l'invention a aussi pour objet un procédé pour revêtir à distance toutes surfaces placées dans une cavité fermée, à l'aide d'un produit pouvant adhérer sur ces surfaces.The present invention specifically relates to a method for coating at a distance surfaces such as the surfaces of the cavity formed between the plugs of an enclosure and a container containing toxic products before their uncoupling and the coming of these surfaces in contact with the atmosphere. However, the subject of the invention is also a process for remotely coating all surfaces placed in a closed cavity, using a product which can adhere to these surfaces.

Dans ce but et conformément à l'invention, il est proposé un procédé comprenant les étapes successives suivantes :

  • - dissolution du produit dans un solvant apte à mouiller ladite surface,
  • - remplissage de la cavité à l'aide de la solution ainsi formée,
  • - vaporisation du solvant, et
  • - évacuation du solvant vaporisé hors de la cavité.
For this purpose and in accordance with the invention, a method is proposed comprising the following successive steps:
  • - dissolution of the product in a solvent capable of wetting said surface,
  • - filling the cavity with the solution thus formed,
  • - vaporization of the solvent, and
  • - evacuation of the vaporized solvent out of the cavity.

La vaporisation du solvant peut être obtenue soit en créant une dépression, soit en faisant circuler de l'air à l'intérieur de la cavité.The vaporization of the solvent can be obtained either by creating a vacuum, or by circulating air inside the cavity.

Dans l'application de ce procédé à la fixation de poussières toxiques sur les parois d'une cavité définie entre les bouchons de deux enceintes étanches contenant une atmosphère toxique, avant le désaccouplement de ces enceintes, le produit utilisé est constitué de préférence par une graisse silicone et le solvant est constitué de préférence par du fréon.In the application of this process to the fixing of toxic dust on the walls of a cavity defined between the plugs of two sealed enclosures containing a toxic atmosphere, before the uncoupling of these enclosures, the product used preferably consists of a grease silicone and the solvent preferably consists of freon.

On décrira maintenant, à titre d'exemple non limitatif, un mode de réalisation particulier de l'invention en se référant au dessin annexé dans lequel la figure unique est une vue en coupe qui représente la tête d'un conteneur accouplée sur une enceinte de remplissage ou de vidage de ce conteneur.A particular embodiment of the invention will now be described, by way of non-limiting example, with reference to the appended drawing in which the single figure is a sectional view which represents the head of a container coupled to an enclosure of filling or emptying of this container.

Ainsi, on voit sur la figure unique une partie de la paroi 10 d'une enceinte contenant un produit toxique et notamment un produit radioactif à haut pouvoir contaminant, tel que de l'oxyde de plutonium en poudre. Cette enceinte peut être soit une enceinte dans laquelle ce produit est élaboré, soit une enceinte de stockage, soit une enceinte dans laquelle ce produit est traité. La paroi 10 de l'enceinte sépart la zone interne contaminée 10a de la zone externe inactive 106. Quelle que soit la fonction de l'enceinte, il est nécessaire de prévoir des moyens pour assurer l'entrée ou la sortie du produit dans un conteneur 12 permettant son transport entre deux enceintes telles qu'une enceinte de stockage et une enceinte de traitement. Ces moyens sont constitués par un sas 14 qui comprend une virole cylindrique 16 solidarisée de façon étanche de l'enceinte 10 et un bouchon 18 obturant de façon étanche, par exemple au moyen d'un joint 20, l'extrémité de la virole 16 placée à l'intérieur de l'enceinte 10. L'autre extrémité de la virole 16 est normalement obturée par un opercule 22 lorsqu'aucun conteneur n'est accouplé à l'enceinte 10. Un transducteur à ultra-sons peut être logé dans le bouchon 18.Thus, we see in the single figure a part of the wall 10 of an enclosure containing a toxic product and in particular a radioactive product to high contaminating power, such as plutonium oxide powder. 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. Whatever the function of the enclosure, 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. These means consist of 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 ferrule 16 is normally closed by a cover 22 when no container is coupled to the enclosure 10. An ultrasonic transducer can be housed in the cap 18.

Le conteneur 12 est disposé dans un emballage de manutention 24 pouvant être accouplé sur l'enceinte 10 en regard du sas 14, par exemple au moyen d'une couronne de fixation à baionnette 26. En cours de transport, le conteneur 12 est logé à l'intérieur de l'emballage 24 et ce dernier est obturé du côté de la couronne de verrouillage 26 par un opercule 28. Le conteneur 12 est lui-même obturé du côté de l'opercule 28 par un bouchon 30 équipé d'un joint d'étanchéité approprié 32.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. During transport, the container 12 is housed at the interior of the package 24 and the latter is closed on the side of the locking ring 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.

Comme l'illustre la figure, lorsque le conteneur 12 doit être rempli ou vidé, l'emballage 24 est accouplé à l'enceinte 10 au moyen de la couronne 26. Les opercules 22 et 28 sont alors ouverts et le conteneur 12 est amené à l'intérieur du sas 14 et fixé dans la virole 16 par des moyens (non représentés) tels que par vissage. Comme le montre la figure, dans cette position, un joint 34 assure une parfaite étanchéité entre l'extrémité du conteneur entourant le bouchon 30 et la surface en vis-à-vis de la virole 16. Le bouchon 18, puis le bouchon 30 sont ensuite retirés et le remplissage ou le vidage cu conteneur effectué, en opérant dans l'enceinte contaminée.As illustrated in the figure, when the container 12 must be filled or emptied, 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. As the figure, in this position, 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 filling or emptying of the container made, operating in the contaminated enclosure.

Lorsque la manutention est terminée, le bouchon 30 du conteneur, puis le bouchon 18 du sas, sont remis en place. Par suite de la nature des produits contenus dans l'enceinte 10 et dans le conteneur 12, on conçoit que la cavité C définie entre les bouchons 18 et 30 est contaminée. L'air contenu dans cette cavité pouvant venir en contact avec des surfaces externes de l'enceinte ou du conteneur au cours de l'opération de désaccouplement, il est nécessaire de procéder à une décontamination de la cavité C.When the handling is finished, the cap 30 of the container, then the cap 18 of the airlock, are replaced. Due to the nature of the products contained in the enclosure 10 and in the container 12, it can be understood 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.

Dans un premier temps, cette décontamination peut être réalisée en faisant circuler du fréon agité par des ultrasons dans cette cavité, comme l'enseigne le brevet français n° 2352377 du 21 mai 1976. Toutefois, après cette opération, il subsiste une contamination résiduelle des parois de la cavité C, qui risque d'entraîner une dispersion de poussières toxiques au cours de l'opération de désaccouplement. Si cette dispersion est tolérable du point de vue des critères de contamination atmosphérique généralement admis, il est toutefois souhaitable de l'éviter.Initially, this decontamination can be carried out by circulating ultrasonically stirred freon in this cavity, as taught by French patent No. 2352377 of May 21, 1976. However, after 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.

A cet effet, et conformément à l'invention, on prévoit en plus des moyens de décontamination par fréon agités par ultrasons (non représentés sur la figure afin de faciliter la compréhension de l'invention) des moyens permettant de déposer à distance un film d'un produit fixant les poussières toxiques sur les parois de la cavité C.To this end, and in accordance with the invention, there are also provided 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.

Ces moyens comprennent au moins un conduit d'entrée 36 et au moins un conduit de sortie 38 traversant la virole 16 pour déboucher dans la cavité C. Afin de réaliser le dépôt à distance du produit de fixation des poussières toxiques notamment sur la surface SI du bouchon 18 et sur la surface S2 du bouchon 30, on dissout ce produit dans un solvant apte à mouiller les parois de la cavité C, on injecte la solution ainsi obtenue par le conduit 36 dans la cavité C, après avoir obturé le conduit de sortie 38 et on vaporise le solvant de façon à fixer une partie du produit introduit en solution dans la cavité C sur les parois de cette cavité et notamment sur les surfaces SI et s2. Cette vaporisation peut se faire soit en faisant circuler de l'air dans la cavité, soit en créant une dépression.These means comprise at least one inlet conduit 36 and at least one outlet conduit 38 passing through the shell 16 to open into the cavity C. In order to deposit the product for fixing toxic dust remotely in particular on the surface SI of the plug 18 and on the surface S 2 of plug 30, this product is dissolved in a solvent capable of wetting the walls of cavity C, the solution thus obtained is injected through conduit 36 into cavity C, after having closed the conduit of 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 SI and s 2 . This vaporization can be done either by circulating air in the cavity, or by creating a vacuum.

En pratique, le produit utilisé pour fixer les poussières toxiques sur les parois pourra être une graisse silicone. En effet, ce produit présente le double avantage d'adhérer facilement aux surfaces et de pouvoir résister à des températures supérieures à 150°C. On pourrait aussi utiliser une peinture cellulosique.In practice, 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. We could also use a cellulosic paint.

Le solvant pourra notamment être constitué par du fréon ou par tout autre solvant organique constituant un agent mouillant dont la température d'ébullition est comprise entre 0°C et 70°C. Parmi ces autres solvants, on peut notamment citer le trichloréthylène, les dérivés chlorés de l'acétone et l'éther. L'emploi du fréon R113 se justifie dans l'application considérée par le fait qu'il contient du chlore neutrophage et qu'il est inerte. De plus, il constitue un bon agent mouillant et il présente une température d'ébullition très basse (45°C) et une tension de vapeur d'environ 0,4 bar à 20°C, ce qui permet de le vaporiser facilement sans chauffer.The solvent may in particular be constituted by freon or by any other organic solvent constituting a wetting agent, the boiling temperature of which is between 0 ° C. and 70 ° C. Among these other solvents, mention may in particular be made of trichlorethylene, chlorinated derivatives of acetone and ether. The use of freon R113 is justified in the application considered by the fact that it contains neutron-absorbing chlorine and that it is inert. In addition, it 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 .

L'ensemble du circuit constitué par les conduits 36 et 38 et par la cavité C définissant un volume d'environ 0,5 1, on utilisera à titre d'exemple 200 g de graisse de silicone dissoute dans 1,5 1 de fréon. Grâce à ce procédé, on réalise un film régulier de graisse silicone dont l'épaisseur régulière peut être comprise entre 0,3 et 1 mm. La régularité et l'épaisseur de ce film permettent de fixer pratiquement la totalité des poussières contaminant les parois de la cavité C.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.

Lorsque le conteneur 12 est ensuite accouplé à une autre enceinte, la surface S2 du bouchon est nettoyée en remplissant la cavité C de fréon et en évacuant la solution ainsi obtenue avant d'ouvrir les bouchons. La surface SI de l'enceinte est nettoyée de la même manière lorsqu'un autre conteneur est accouplé à l'enceinte 10.When the container 12 is then coupled to another enclosure, 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.

Bien entendu, l'invention n'est pas limitée au mode de réalisation qui vient d'être décrit à titre d'exemple, mais en couvre toutes les vàrian- tes. En particulier, l'invention s'applique à tout revêtement à distance des surfaces d'une cavité à l'aide d'un produit adhérant sur ces surfaces.Of course, the invention is not limited to the embodiment which has just been described by way of example, but covers all the variations thereof. In particular, the invention applies to any coating at a distance from the surfaces of a cavity using a product adhering to these surfaces.

Claims (5)

1. Procédé pour revêtir à distance les surfaces (Sl, S2) d'une cavité fermée (C) à l'aide d'un produit pouvant adhérer sur lesdites surfaces, caractérisé en ce qu'il comprend les étapes successives suivantes : - dissolution du produit dans un solvant apte à mouiller ladite surface, - remplissage de la cavité (C) à l'aide de la solution ainsi formée, - vaporisation du solvant, et - évacuation du solvant vaporisé hors de la cavité (C). 1. A method of remotely coating the surfaces (S l , S 2 ) of a closed cavity (C) using a product which can adhere to said surfaces, characterized in that it comprises the following successive steps: - dissolution of the product in a solvent capable of wetting said surface, - filling the cavity (C) with the solution thus formed, - vaporization of the solvent, and - evacuation of the vaporized solvent out of the cavity (C). 2. Procédé selon la revendication 1, caractérisé en ce qu'on vaporise le solvant en créant une dépression à l'intérieur de la cavité (C).2. Method according to claim 1, characterized in that the solvent is vaporized by creating a vacuum inside the cavity (C). 3. Procédé selon la revendication 1, caractérisé en ce qu'on vaporise le solvant en faisant circuler de l'air à l'intérieur de la cavité (C).3. Method according to claim 1, characterized in that the solvent is vaporized by circulating air inside the cavity (C). 4. Application du procédé selon l'une quelconque des revendications 1 à 3 à la fixation de poussières toxiques sur les parois d'une cavité (C) définie entre les bouchons (18, 30) de deux enceintes étanches (10, 12) contenant une atmosphère toxique, avant le désaccouplement de ces enceintes, caractérisée en ce que le produit utilisé est une graisse silicone.4. Application of the method according to any one of claims 1 to 3 to the fixing of toxic dust on the walls of a cavity (C) defined between the plugs (18, 30) of two sealed enclosures (10, 12) containing a toxic atmosphere, before the uncoupling of these speakers, characterized in that the product used is a silicone grease. 5. Application selon la revendication 4, caractérisée en ce que le solvant est du fréon.5. Application according to claim 4, characterized in that the solvent is freon.
EP82402331A 1981-12-24 1982-12-17 Method of decontaminating a closed cavity containing toxic dust Expired EP0083525B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8124221 1981-12-24
FR8124221A FR2518904A1 (en) 1981-12-24 1981-12-24 METHOD FOR REMOTELY DEPOSITING A PRODUCT ON A SURFACE AND ITS APPLICATION TO THE FIXING OF TOXIC DUST ON THE WALLS OF A CONTAMINATED CAVITY

Publications (2)

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EP0083525A1 true EP0083525A1 (en) 1983-07-13
EP0083525B1 EP0083525B1 (en) 1985-09-18

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EP82402331A Expired EP0083525B1 (en) 1981-12-24 1982-12-17 Method of decontaminating a closed cavity containing toxic dust

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US (1) US4504524A (en)
EP (1) EP0083525B1 (en)
DE (1) DE3266440D1 (en)
FR (1) FR2518904A1 (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
FR2638451A1 (en) * 1988-11-03 1990-05-04 Ruggieri METHOD FOR PRODUCING A FIRE TRANSMISSION CONDUIT AND CONDUIT OBTAINED BY THIS METHOD

Families Citing this family (2)

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Publication number Priority date Publication date Assignee Title
JP4344760B2 (en) * 2007-06-15 2009-10-14 シャープ株式会社 Solid-state imaging device and electronic apparatus including the same
JP4344761B2 (en) * 2007-06-15 2009-10-14 シャープ株式会社 Solid-state imaging device and electronic apparatus including the same

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FR843102A (en) * 1937-09-22 1939-06-26 Paul Lechler Method for the protection of inaccessible capacities
GB1081111A (en) * 1965-01-11 1967-08-31 Hooker Chemical Corp Method of applying coatings
FR2094684A5 (en) * 1970-06-30 1972-02-04 Loire Atel Forges
FR2177391A5 (en) * 1972-03-23 1973-11-02 Dow Chemical Co
FR2352377A1 (en) * 1976-05-21 1977-12-16 Commissariat Energie Atomique INSTALLATION FOR THE TRANSFER INTO A CONTAINER OF A TOXIC PRODUCT, ESPECIALLY OF A RADIOACTIVE PRODUCT WITH HIGH CONTAMINATION POWERS, AND CONTAINER SUITABLE FOR THE IMPLEMENTATION OF THIS INSTALLATION
FR2380624A1 (en) * 1977-02-09 1978-09-08 Commissariat Energie Atomique Radioactive decontamination by applying gel contg. decontaminant - then rinsing off or removing when dry
GB2057917A (en) * 1979-09-07 1981-04-08 Oakes Ltd E T A method of coating the interior surface of a pipe

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FR843102A (en) * 1937-09-22 1939-06-26 Paul Lechler Method for the protection of inaccessible capacities
GB1081111A (en) * 1965-01-11 1967-08-31 Hooker Chemical Corp Method of applying coatings
FR2094684A5 (en) * 1970-06-30 1972-02-04 Loire Atel Forges
FR2177391A5 (en) * 1972-03-23 1973-11-02 Dow Chemical Co
FR2352377A1 (en) * 1976-05-21 1977-12-16 Commissariat Energie Atomique INSTALLATION FOR THE TRANSFER INTO A CONTAINER OF A TOXIC PRODUCT, ESPECIALLY OF A RADIOACTIVE PRODUCT WITH HIGH CONTAMINATION POWERS, AND CONTAINER SUITABLE FOR THE IMPLEMENTATION OF THIS INSTALLATION
FR2380624A1 (en) * 1977-02-09 1978-09-08 Commissariat Energie Atomique Radioactive decontamination by applying gel contg. decontaminant - then rinsing off or removing when dry
GB2057917A (en) * 1979-09-07 1981-04-08 Oakes Ltd E T A method of coating the interior surface of a pipe

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2638451A1 (en) * 1988-11-03 1990-05-04 Ruggieri METHOD FOR PRODUCING A FIRE TRANSMISSION CONDUIT AND CONDUIT OBTAINED BY THIS METHOD
EP0367669A1 (en) * 1988-11-03 1990-05-09 Ruggieri Method for making an ignition transmission cord, and cord obtained thereby

Also Published As

Publication number Publication date
US4504524A (en) 1985-03-12
EP0083525B1 (en) 1985-09-18
FR2518904B1 (en) 1985-05-17
FR2518904A1 (en) 1983-07-01
DE3266440D1 (en) 1985-10-24

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