EP0055671B1 - Process for fixing radioactive contamination on materials or contaminated wastes and its application - Google Patents

Process for fixing radioactive contamination on materials or contaminated wastes and its application Download PDF

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Publication number
EP0055671B1
EP0055671B1 EP19810402073 EP81402073A EP0055671B1 EP 0055671 B1 EP0055671 B1 EP 0055671B1 EP 19810402073 EP19810402073 EP 19810402073 EP 81402073 A EP81402073 A EP 81402073A EP 0055671 B1 EP0055671 B1 EP 0055671B1
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Prior art keywords
resin
process according
resins
application
fixing
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EP19810402073
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German (de)
French (fr)
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EP0055671A1 (en
EP0055671B2 (en
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Guy Aubouin
Georges Aude
Christian De Tassigny
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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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    • 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
    • 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
    • G21F9/28—Treating solids
    • G21F9/30—Processing
    • G21F9/301—Processing by fixation in stable solid media
    • G21F9/307—Processing by fixation in stable solid media in polymeric matrix, e.g. resins, tars

Definitions

  • the subject of the present invention is a method for fixing radioactive contamination on polluted materials or waste as well as its application.
  • the present invention provides a solution to this problem of transferring and handling contaminated objects.
  • the process which is the subject of the invention is easy to carry out, has a low cost price and provides very high safety.
  • the subject of the invention is a method for fixing the radioactive contamination of contaminated materials, characterized in that at least one layer of polymerizable resin is sprayed, using an electrostatic gun, at ambient temperature. on contaminated materials.
  • epoxy resins epoxy resins, polyester resins, vinyl resins, mixtures of thermosetting and thermoplastic resins can be considered,
  • Thinners to adjust the viscosity, can be added to the resins. Depending on the operating conditions, open air or closed premises, these diluents will be chosen to be flammable or not.
  • diluents By way of example of diluents, mention may be made of the mixture of 1.1.2 trichloro, 1.2.2 trifluoroethane and 1.1.1 trichloroethane, the ketone derivatives and the diluents E and SC 1 sold by the company BLANCOMME. These diluents are chosen according to their properties, in particular their flash point, their viscosity and their resistivity to obtain a mixture capable of being sprayed by an electrostatic gun.
  • Adjuvants can also be incorporated into the resins.
  • powdered metals can be used, for example, aluminum powder, zinc powder, etc., metal oxides such as oxides of zinc, iron, aluminum, titanium etc., salts such as calcium carbonate, fibers for example glass, carbon, boron fibers etc. and mineral beads for example glass or silica beads.
  • Any electrostatic paint having the above characteristics can be used in the process of the invention, for example epoxy - phenolic and epoxy - aminoplast resins, esters of epoxy resins and fatty acids and epoxy resins modified with polyamines or with diisocyanates.
  • the paints can be sprayed in liquid form in a solvent or in powder form.
  • the fixing of the contamination takes place only to ensure a transfer of the materials in complete safety.
  • a thin layer of resin is deposited in one or more passes on the material.
  • This deposit can take place in an armored cell or in the open air, depending on the activity.
  • the material is transported and packaged by any known means, such as that described in French patent FR-A-2 361 725: "Process for storing large solid radioactive waste”.
  • the fixation of the contamination serves at the same time as final packaging.
  • a suitable number of passes should be provided to ensure a sufficiently thick resin coating.
  • the resin is applied pure or mixed with an inert filler.
  • fixation properties of the contamination were determined by comparison of smears carried out on control surfaces soiled by labile contamination, before and after projection.
  • the layer (s) adhere perfectly after polymerization to the surface of the waste, do not break or flake off if the waste undergoes mechanical deformation after coating, and are resistant to falling.
  • the installation comprises a closed enclosure I constituted by a fume cupboard inside which one can introduce an electrostatic projection gun 3, for example a gun of the Statary type marketed by the SAMES Company, under the reference MRV96.
  • an electrostatic projection gun 3 for example a gun of the Statary type marketed by the SAMES Company, under the reference MRV96.
  • the nozzle of the electrostatic gun 3 is supplied with electric current by a generator 5 which supplies by the conductor 7 a high voltage (90k-volt) with a current of approximately 0.1 milliampere, and which is connected to the sector by the conductor 9 .
  • the gun 3 is also supplied with compressed air by line 11 provided with an adjustable pressure gauge 13, and with resin by line 15 connected to a resin tank 17 itself supplied with compressed air by line 19.
  • pressure gauges 21 make it possible to control the pressure in the various circuits of the installation.
  • the part 3 of contaminated material can be placed on a support and connected to ground by 25.
  • a container 27 is placed below the part 23 to collect the drops of excess resin which are likely to to flow from the part 23 during the projection operation.
  • the fume cupboard I is connected to a duct 29 provided with a grid 31 in order to ensure ventilation inside the fume cupboard I and to renew the air.
  • the nozzle of the gun 3 is chosen according to the shape of the pieces of contaminated material to be treated and it can project either a rounded jet 4 which is suitable for the treatment of pieces of complex shape, or a flat jet for the pieces of large surface .
  • the part 23 of contaminated material to be treated is placed in the fume cupboard I and the electrostatic gun 3 is supplied, on the one hand, with electric current and, on the other hand, with resin maintaining in the reservoir 17 an air pressure of 0.5 to 6 bars.
  • the resin is sprayed onto the external surface of the part 23 and the excess resin drops are collected in the container 27.
  • This example is intended to determine the yield of the fixing of the resin.
  • This example is intended to show the efficiency of the process.
  • the first plate After drying, the first plate is left intact as a control.
  • a layer of resin is deposited (approximately 25 to 30 ⁇ m).
  • This example shows the effectiveness of the process when depositing the paint in a thick layer.
  • Three plates of degreased steel are prepared and the first plate is covered with a layer of powder paint sprayed electrostatically, which consists of the epoxy paint sold by the company BLANCOMME under the reference 95 KT 17 White-red-brown powder.
  • the spraying is continued for 20 seconds and the curing is carried out hot at a temperature of 180 ° C.
  • a layer is thus obtained whose thickness is 700 microns.
  • degreasing the plates is to facilitate the attachment of the thick layer of paint.
  • this degreasing operation could be replaced by the deposition on the plates of a layer of primer paint, which also makes it possible to ensure the attachment of the paint subsequently deposited in a thick layer.

Description

La présente invention a pour objet un procédé permettant de fixer la contamination radioactive sur des matériaux ou des déchets pollués ainsi que son application.The subject of the present invention is a method for fixing radioactive contamination on polluted materials or waste as well as its application.

La manipulation et le conditionnement des déchets radioactifs posent de nombreux problèmes de sécurité. Il est connu de conditionner les déchets radioactifs, en vue de leur stockage, dans des résines thermodurcissables en enrobant lesdits déchets dans des résines polyesters ou époxydiques. Ces procédés s'appliquent aussi bien aux poudres, aux liquides organiques, aux résines échangeuses d'ions qu'aux objets de dimensions importantes. Le brevet Français FR-A-2 129 836 et ses certificats d'addition FR-A-2 230 041, FR-A-2 251 081, FR-A-2 273 350 et les brevets français FR-A-2 361 724 et FR-A-2 361 725 déposés au nom du demandeur décrivent ces techniques.The handling and packaging of radioactive waste poses many safety problems. It is known to condition radioactive waste, for storage, in thermosetting resins by coating said waste in polyester or epoxy resins. These processes apply to powders, organic liquids, ion exchange resins as well as large objects. French patent FR-A-2 129 836 and its certificates of addition FR-A-2 230 041, FR-A-2 251 081, FR-A-2 273 350 and French patents FR-A-2 361 724 and FR-A-2 361 725 filed in the name of the applicant describe these techniques.

Néanmoins, dans le cas des objets de très grandes dimensions, comme cela se produit lors du démantèlement des installations nucléaires, c'est-à-dire lors du démontage, en vue de leur stockage, des parties d'installations nucléaires contaminées, des précautions très importantes doivent être prises afin de fixer la contamination sur les pièces pour éviter de contaminer les locaux successifs où ces pièces séjourneront durant lés diverses phases du processus de conditionnement.However, in the case of very large objects, as occurs during the dismantling of nuclear installations, that is to say during the dismantling, with a view to their storage, of the parts of contaminated nuclear installations, precautions very important must be taken in order to fix the contamination on the pieces to avoid contaminating the successive premises where these pieces will stay during the various phases of the conditioning process.

La présente invention apporte une solution à ce problème de transfert et de manipulation d'objets contaminés. Le procédé, objet de l'invention, est d'une mise en oeuvre aisée, d'un prix de revient peu élevé et apporte une très grande sûreté.The present invention provides a solution to this problem of transferring and handling contaminated objects. The process which is the subject of the invention is easy to carry out, has a low cost price and provides very high safety.

Plus précisément l'invention a pour objet un procédé de fixation de la contamination radioactive de matériaux contaminés, caractérisé en ce que l'on projette, à l'aide d'un pistolet électrostatique, au moins une couche de résine polymérisable à la température ambiante sur les matériaux contaminés.More precisely, the subject of the invention is a method for fixing the radioactive contamination of contaminated materials, characterized in that at least one layer of polymerizable resin is sprayed, using an electrostatic gun, at ambient temperature. on contaminated materials.

L'application du pistolet électrostatique, qui crée un champ électrique entre la buse portée à un potentiel élevé et le matériau porté à la masse, permet à ce dernier d'attirer les particules de résine chargées électriquement et d'enrober totalement ledit matériau. L'utilisation du champ électrique créé présente un triple avantage:

  • a) économie de matière;
  • b) les pièces à revêtir sont souvent télémanipu- lées. Le fait que les particules de résine suivent les lignes de champ, diminue beaucoup le nombre de télémanipulations, ce qui conduit à une exploitation plus simple que dans le cas d'une projection classique;
  • c) les pertes en matière étant minimes, les filtres en exploitation dans les cellules de démantèlement où on utilise ce procédé, se colmateront plus lentement que dans le cas d'une projection classique.
The application of the electrostatic gun, which creates an electric field between the nozzle brought to a high potential and the material brought to ground, allows the latter to attract the particles of electrically charged resin and to completely coat said material. The use of the electric field created has a triple advantage:
  • a) saving of material;
  • b) the parts to be coated are often remote manipulated. The fact that the resin particles follow the field lines, greatly reduces the number of remote manipulations, which leads to a simpler operation than in the case of a conventional projection;
  • c) the losses in material being minimal, the filters in operation in the dismantling cells where this process is used, will clog up more slowly than in the case of a conventional projection.

En ce qui concerne l'équipement mis en oeuvre (alimentation THT, pistolet ...) les éléments concourant à la sécurité d'utilisation sont les suivants:

  • - La THT (60 à 90 Kv) a un débit limité à une valeur très faible(60 à 150 flA suivant les types de pistolet); l'énergie contenue dans l'étincelle qui se produirait entre buse et masse est de ce fait très faible.
With regard to the equipment used (THT power supply, spray gun, etc.), the elements contributing to safety in use are as follows:
  • - The THT (60 to 90 Kv) has a flow rate limited to a very low value (60 to 150 fl A depending on the gun types); the energy contained in the spark which would occur between nozzle and ground is therefore very low.

Seule la buse est portée à la THT, le corps du pistolet étant lui-même à la masse. L'expérience montre d'ailleurs que le contact direct de la buse par un opérateur ne présente aucun danger.Only the nozzle is brought to the THT, the body of the gun itself being grounded. Experience has shown, moreover, that direct contact of the nozzle by an operator does not present any danger.

  • - Le matériau ou déchet est mis à la masse par contact avec son support, lui-même à la masse; les charges électriques portées par la résine s'écoulent ainsi à la masse, évitant tout risque de création d'une charge électrostatique qui pourrait amorcer une étincelle. Il a été vérifié que, même si le support est superficiellement recouvert d'une couche correspondant à trente pulvérisations, la qualité de la mise à la masse du déchet n'est pas compromise.- The material or waste is grounded by contact with its support, itself grounded; the electrical charges carried by the resin thus flow to ground, avoiding any risk of creating an electrostatic charge which could initiate a spark. It has been verified that, even if the support is superficially covered with a layer corresponding to thirty sprays, the quality of the grounding of the waste is not compromised.

Parmi les résines utilisables on peut envisager les résines époxydiques, les résines polyesters, les résines vinyliques, les mélanges de résines thermodurcissables et thermoplastiques,Among the resins which can be used, epoxy resins, polyester resins, vinyl resins, mixtures of thermosetting and thermoplastic resins can be considered,

A titre d'exemple, on peut citer la peinture époxyde commercialisée sois la marque «RIV-EPOX ELECTROSTATIQUE 80088» associée à son «Durcisseur 80057».By way of example, mention may be made of the epoxy paint sold under the brand name "RIV-EPOX ELECTROSTATIQUE 80088" associated with its "Hardener 80057".

Des diluants, pour ajuster la viscosité, peuvent être additionnés aux résines. Selon les conditions opératoires, plein air ou locaux fermés, ces diluants seront choisis inflammables ou pas.Thinners, to adjust the viscosity, can be added to the resins. Depending on the operating conditions, open air or closed premises, these diluents will be chosen to be flammable or not.

A titre d'exemple de diluants, on peut citer le mélange de 1.1.2 trichloro, 1.2.2 trifluoroéthane et de 1.1.1 trichloroéthane, les dérivés cétoniques et les diluants E et SC 1 commercialisés par la Société BLANCOMME. Ces diluants sont choisis en fonction de leurs propriétés, en particulier de leur point éclair, de leur viscosité et de leur résistivité pour obtenir un mélange susceptible d'être projeté par un pistolet électrostatique.By way of example of diluents, mention may be made of the mixture of 1.1.2 trichloro, 1.2.2 trifluoroethane and 1.1.1 trichloroethane, the ketone derivatives and the diluents E and SC 1 sold by the company BLANCOMME. These diluents are chosen according to their properties, in particular their flash point, their viscosity and their resistivity to obtain a mixture capable of being sprayed by an electrostatic gun.

Des adjuvants peuvent aussi être incorporés aux résines. A titre d'adjuvants, on peut utiliser des métaux en poudre, par exemple, de la poudre d'aluminium, de la poudre de zinc, etc., des oxydes métalliques tels que les oxydes de zinc, de fer, d'aluminium, de titane etc., des sels comme le carbonate de calcium, des fibres par exemple des fibres de verre, de carbone, de bore etc.... et des billes minérales par exemple des billes de verre ou de silice.Adjuvants can also be incorporated into the resins. As adjuvants, powdered metals can be used, for example, aluminum powder, zinc powder, etc., metal oxides such as oxides of zinc, iron, aluminum, titanium etc., salts such as calcium carbonate, fibers for example glass, carbon, boron fibers etc. and mineral beads for example glass or silica beads.

Dans tous les cas, on sélectionne les additifs utilisés et on règle leur quantité de façon que le mélange de résine qui sera projeté par le pistolet électrostatique, présente:

  • - une viscosité convenable, par exemple de l'ordre de 30 s à 20 °C lorsqu'on la mesure par écoulement en coupe Ford n° 4;
  • - une constante diélectrique qui permette la charge des particules;
  • - une résistivité appropriée qui dépend du type de pistolet utilisé, par exemple une résistivité de 1 à 100 MQ. cm.;
  • - une volatilité compatible avec un temps de séchage et de polymérisation de l'ordre de 60 min à la température ambiante;
  • - un point éclair supérieur à 21 °C; et
  • - une bonne compatibilité (corrosion) avec les matériaux contaminés à traiter.
In all cases, the additives used are selected and their quantity is adjusted so that the resin mixture which will be sprayed by the electrostatic gun, presents:
  • - a suitable viscosity, for example of the order of 30 s at 20 ° C when measured by flow in Ford n ° 4 section;
  • - a dielectric constant which allows the charge of the particles;
  • - an appropriate resistivity which depends on the type of gun used, for example a resistivity of 1 to 100 MQ. cm .;
  • - volatility compatible with a time of drying and polymerization on the order of 60 min at room temperature;
  • - a flash point above 21 ° C; and
  • - good compatibility (corrosion) with the contaminated materials to be treated.

Toute peinture électrostatique présentant les caractéristiques précitées peut être utilisée dans le procédé de l'invention par exemple des résines époxy - phénoliques et époxy - aminoplastes, des esters de résines époxydes et d'acides gras et des résines époxydes modifiées par des polyamines ou par des diisocyanates.Any electrostatic paint having the above characteristics can be used in the process of the invention, for example epoxy - phenolic and epoxy - aminoplast resins, esters of epoxy resins and fatty acids and epoxy resins modified with polyamines or with diisocyanates.

Les peintures peuvent être projetées sous forme liquide dans un solvant ou sous la forme de poudre.The paints can be sprayed in liquid form in a solvent or in powder form.

Selon une première application du procédé de l'invention, la fixation de la contamination a lieu uniquement pour assurer un transfert des matériaux en toute sécurité.According to a first application of the method of the invention, the fixing of the contamination takes place only to ensure a transfer of the materials in complete safety.

Dans ce cas, on dépose en une ou plusieurs passes une couche fine de résine sur le matériau. Ce dépôt peut avoir lieu en cellule blindée ou à l'air libre selon l'activité. Après dépôt, le matériau est transporté et conditionné par tous moyens connus, comme par exemple celui décrit dans le brevet français FR-A-2 361 725: «Procédé de stockage de déchets radioactifs solides de grandes dimensions».In this case, a thin layer of resin is deposited in one or more passes on the material. This deposit can take place in an armored cell or in the open air, depending on the activity. After deposition, the material is transported and packaged by any known means, such as that described in French patent FR-A-2 361 725: "Process for storing large solid radioactive waste".

Selon une deuxième application de l'invention, utilisable notamment pour des pièces de faible activité, la fixation de la contamination sert en même temps de conditionnement définitif. Dans ce cas, il convient de prévoir un nombre convenable de passes afin d'assurer un revêtement de résine suffisamment épais. La résine est appliquée pure ou mélangée à une charge inerte.According to a second application of the invention, usable in particular for parts of low activity, the fixation of the contamination serves at the same time as final packaging. In this case, a suitable number of passes should be provided to ensure a sufficiently thick resin coating. The resin is applied pure or mixed with an inert filler.

Les propriétés de fixation de la contamination ont été déterminées par comparaison de frottis effectués sur des surfaces témoins souillées par une contamination labile, avant et après projection.The fixation properties of the contamination were determined by comparison of smears carried out on control surfaces soiled by labile contamination, before and after projection.

La ou les couches adhèrent parfaitement après polymérisation à la surface du déchet, ne cassent ni se s'écaillent si le déchet subit une déformation mécanique après revêtement, et résistent à la chute.The layer (s) adhere perfectly after polymerization to the surface of the waste, do not break or flake off if the waste undergoes mechanical deformation after coating, and are resistant to falling.

Généralement, l'équipement de projection électrostatique est composé d'un pistolet dont la buse de projection est alimentée:

  • - en THT (60 à 90 Kv) à très faible débit (60 à 150 flA suivant le type de pistolet), et
  • - en mélange à projeter, à partir d'un réservoir, maintenu à une pression d'air de 0,5 à 6 bars, suivant le type de pistolet.
Generally, the electrostatic projection equipment consists of a gun, the projection nozzle of which is supplied:
  • - in THT (60 to 90 Kv) at very low flow rate (60 to 150 fl A depending on the type of gun), and
  • - as a spray mixture, from a tank, maintained at an air pressure of 0.5 to 6 bars, depending on the type of gun.

D'autres caractéristiques et avantages de l'invention apparaitront mieux à la lecture de la description qui suit, donnée bien entendu à titre illustratif et non limitatif, en référence au dessin annexé qui représente une installation pour la mise en oeuvre du procédé de l'invention.Other characteristics and advantages of the invention will appear better on reading the description which follows, given of course by way of illustration and not limitation, with reference to the appended drawing which represents an installation for implementing the method of invention.

Sur cette figure, on voit que l'installation comprend une enceinte fermée I constituée par une sorbonne à l'intérieur de laquelle on peut introduire un pistolet de projection électrostatique 3, par exemple un pistolet de type Stataire commercialisé par la Société SAMES, sous la référence MRV96.In this figure, we see that the installation comprises a closed enclosure I constituted by a fume cupboard inside which one can introduce an electrostatic projection gun 3, for example a gun of the Statary type marketed by the SAMES Company, under the reference MRV96.

La buse du pistolet électrostatique 3 est alimentée en courant électrique par un générateur 5 qui fournit par le conducteur 7 une haute tension (90k-volt) avec un courant d'environ 0,1 milliampère, et qui est relié au secteur par le conducteur 9.The nozzle of the electrostatic gun 3 is supplied with electric current by a generator 5 which supplies by the conductor 7 a high voltage (90k-volt) with a current of approximately 0.1 milliampere, and which is connected to the sector by the conductor 9 .

Le pistolet 3 est alimenté par ailleurs en air comprimé par la conduite 11 munie d'un manomètre détendeur réglable 13, et en résine par la conduite 15 reliée à un réservoir de résine 17 lui-même alimenté en air comprimé par la conduite 19. Des manomètres 21 permettent de contrôler la pression dans les divers circuits de l'installation. A l'intérieur de la sorbonne 1, on peut disposer la pièce 3 de matériau contaminé sur un support et la relier à la masse par 25. Un récipient 27 est disposé en dessous de la pièce 23 pour recueillir les gouttes de résine en excès susceptibles de s'écouler de la pièce 23 lors de l'opération de projection. A sa partie supérieure, la sorbonne I est reliée à un conduit 29 muni d'une grille 31 afin d'assurer la ventilation à l'intérieur de la sorbonne I et renouveler l'air.The gun 3 is also supplied with compressed air by line 11 provided with an adjustable pressure gauge 13, and with resin by line 15 connected to a resin tank 17 itself supplied with compressed air by line 19. pressure gauges 21 make it possible to control the pressure in the various circuits of the installation. Inside the fume cupboard 1, the part 3 of contaminated material can be placed on a support and connected to ground by 25. A container 27 is placed below the part 23 to collect the drops of excess resin which are likely to to flow from the part 23 during the projection operation. At its upper part, the fume cupboard I is connected to a duct 29 provided with a grid 31 in order to ensure ventilation inside the fume cupboard I and to renew the air.

La buse du pistolet 3 est choisie en fonction de la forme des pièces de matériau contaminé à traiter et elle peut projeter soit un jet arrondi 4 qui est approprié pour le traitement de pièces de forme complexe, soit un jet plat pour les pièces de grande surface.The nozzle of the gun 3 is chosen according to the shape of the pieces of contaminated material to be treated and it can project either a rounded jet 4 which is suitable for the treatment of pieces of complex shape, or a flat jet for the pieces of large surface .

Pour mettre en oeuvre le procédé de l'invention, on dispose la pièce 23 de matériau contaminé à traiter dans la sorbonne I et on alimente le pistolet électrostatique 3, d'une part, en courant électrique et, d'autre part, en résine en maintenant dans le réservoir 17 une pression d'air de 0,5 à 6 bars. Ainsi, on projette la résine sur la surface externe de la pièce 23 et les gouttes de résine en excès sont récupérées dans le récipient 27.To implement the method of the invention, the part 23 of contaminated material to be treated is placed in the fume cupboard I and the electrostatic gun 3 is supplied, on the one hand, with electric current and, on the other hand, with resin maintaining in the reservoir 17 an air pressure of 0.5 to 6 bars. Thus, the resin is sprayed onto the external surface of the part 23 and the excess resin drops are collected in the container 27.

Les exemples suivants illustrent le procédé de l'invention.The following examples illustrate the process of the invention.

Exemple 1.Example 1.

Cet exemple est destiné à déterminer le rendement de la fixation de la résine.This example is intended to determine the yield of the fixing of the resin.

Il a été réalisé dans une hotte pourvue d'une ventilation (1.500 m3/heure, dépression

Figure imgb0001
le générateur très haute tension (THT) fonctionne sous 90 Kv et fournit un courant de 0,10 mA.It was carried out in a hood provided with ventilation (1,500 m 3 / hour, depression
Figure imgb0001
 the very high voltage generator (THT) operates at 90 Kv and provides a current of 0.10 mA.

  • a) Sur une pièce de grande surface (2 m2) on projette 49 g de résine époxydique «03FTI» commercialisée par la Société BLANCOMME. On recueille sur le filtre 0,96 g de résine. Pour cette géométrie de pièce 98% de la résine projetée est donc fixée sur la pièce qui est revêtue d'une couche de résine d'environ 24 flm d'épaisseur.a) 49 g of “03FTI” epoxy resin sold by the company BLANCOMME is sprayed onto a large surface area (2 m 2 ). 0.96 g of resin is collected on the filter. For this part geometry 98% of the projected resin is fixed to the component which is coated with a resin layer of about 24 fl m thick.
  • b) Sur des pièces de formes diverses (grilles, tubes, plaques etc....) on projette 56 g de résine et on recueille sur le filtre 3,1 g. Pour cette géométrie de pièces le rendement est de 94,5%.b) On pieces of various shapes (grids, tubes, plates, etc.), 56 g of resin are sprayed and 3.1 g are collected on the filter. For this geometry of parts the yield is 94.5%.
Exemple 2.Example 2.

Cet exemple est destiné à montrer l'efficacité du procédé.This example is intended to show the efficiency of the process.

On prépare trois plaques d'acier oxydé sur lesquelles on dépose des solutions identiques contenant chacune 240 /!Ci de 137 Cs.It prepares three plates of steel oxidized wherein like solutions is deposited each containing 240 /! The 137 Cs.

Après séchage, on laisse intacte la première plaque qui servira de témoin.After drying, the first plate is left intact as a control.

Sur la deuxième plaque on dépose une couche de résine (25 à 30 flm environ).On the second plate, a layer of resin is deposited (approximately 25 to 30 µm).

Sur la troisième plaque on fixe deux couches de résine (50 à 60 flm environ).On the third plate two layers of resin are fixed (approximately 50 to 60 µm ).

Après séchage on fait un frottis humide sur les trois plaques. Les résultats obtenus figurent dans le tableau ci-après.

Figure imgb0002
After drying, a wet smear is made on the three plates. The results obtained are shown in the table below.
Figure imgb0002

Exemple 3.Example 3.

Cet exemple montre l'efficacité du procédé lorsqu'on dépose la peinture en couche épaisse.This example shows the effectiveness of the process when depositing the paint in a thick layer.

On prépare trois plaques d'acier dégraissé et l'on recouvre la première plaque d'une couche de peinture en poudre projetée électrostatiquement qui est constituée par la peinture époxydique commercialisée par la Société BLANCOMME sous la référence 95 KT 17 Blancopoudre brun-rouge.Three plates of degreased steel are prepared and the first plate is covered with a layer of powder paint sprayed electrostatically, which consists of the epoxy paint sold by the company BLANCOMME under the reference 95 KT 17 White-red-brown powder.

On poursuit la projection pendant 20 secondes et on effectue le durcissement à chaud à une température de 180 °C. On obtient ainsi une couche dont l'épaisseur est de 700 microns.The spraying is continued for 20 seconds and the curing is carried out hot at a temperature of 180 ° C. A layer is thus obtained whose thickness is 700 microns.

On dépose sur la deuxième plaque deux couches de peinture en réalisant deux projections successives, ce qui permet d'obtenir une épais- seurtotale de 1 mm.Two layers of paint are deposited on the second plate, making two successive projections, which gives a total thickness of 1 mm.

Sur la troisième plaque, on projette successivement trois couches de peinture et l'on obtient ainsi une épaisseur totale de 1,5 mm.On the third plate, three layers of paint are successively sprayed and a total thickness of 1.5 mm is obtained.

On précise que l'opération de dégraissage des plaques a pour but de faciliter l'accrochage de la couche épaisse de peinture. Cependant, on pourrait remplacer cette opération de dégraissage par le dépôt sur les plaques d'une couche de peinture primaire, ce qui permet également d'assurer l'accrochage de la peinture déposée ensuite en couche épaisse.It should be noted that the purpose of degreasing the plates is to facilitate the attachment of the thick layer of paint. However, this degreasing operation could be replaced by the deposition on the plates of a layer of primer paint, which also makes it possible to ensure the attachment of the paint subsequently deposited in a thick layer.

Claims (7)

1. Process for fixing radioactive contaminants, characterized in that at least one layer of polymerizable resin is sprayed onto the contaminated material at ambient temperature from an electrostatic spray gun.
2. Process according to claim 1, characterized in that the resin which is polymerizable at ambient temperature is selected from the group comprising epoxy resins, polyester resins, vinyl resins, and mixtures of thermosetting and thermoplastic resins.
3. Process according to claims 1 and 2, characterized in that least one diluent is added to the polymerizable resin.
4. Process according to claims 1, 2 and 3, characterized in that least one filler is added to the resin.
5. Process according to claim 4, characterized in that the filler is iron oxide or zinc oxide.
6.'Application of the process according to any one of claims 1 to 5 for fixing contamination to permit transport of the contaminated material.
7. Application of the process according to any one of claims 1 to 5 for fixing contamination to permit encapsulation and storage.
EP19810402073 1980-12-31 1981-12-23 Process for fixing radioactive contamination on materials or contaminated wastes and its application Expired EP0055671B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8027977A FR2501405B1 (en) 1980-12-31 1980-12-31 METHOD FOR FIXING RADIOACTIVE CONTAMINATION ON CONTAMINATED MATERIALS OR WASTE AND ITS APPLICATION
FR8027977 1980-12-31

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EP0055671A1 EP0055671A1 (en) 1982-07-07
EP0055671B1 true EP0055671B1 (en) 1985-04-10
EP0055671B2 EP0055671B2 (en) 1988-12-07

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EP (1) EP0055671B2 (en)
JP (1) JPS57135400A (en)
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FR (1) FR2501405B1 (en)

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WO1997030457A1 (en) * 1996-02-12 1997-08-21 Siemens Aktiengesellschaft Drum with a body with toxic and/or radioactive contamination and production process of said drum
FR2763264B1 (en) * 1997-05-14 1999-07-23 Rene Massard METHOD OF ELECTROSTATIC PROJECTION OF A RESIN ON A FIBROUS OR CONTAMINATED SUPPORT
LU91605B1 (en) 2009-09-07 2011-03-08 Terra Nobilis S A Method for securing the storage of long-lived radioactive waste.
NL2025759B1 (en) * 2020-06-04 2022-01-28 Rexnord Flattop Europe Bv Method and conveyor for in-line cleaning of containers

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JPS4811568B1 (en) * 1968-10-03 1973-04-14
DE1801578A1 (en) * 1968-10-05 1971-06-03 Tehab Kg M N Duivelaar & Co Radiation shield
FR2361725A1 (en) * 1976-08-13 1978-03-10 Commissariat Energie Atomique LARGE DIMENSIONS SOLID RADIOACTIVE WASTE STORAGE PROCESS
JPS5441000A (en) * 1977-09-08 1979-03-31 Babcock Hitachi Kk Radioactive material fixation device

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DE3169924D1 (en) 1985-05-15
FR2501405B1 (en) 1986-01-17
FR2501405A1 (en) 1982-09-10
EP0055671A1 (en) 1982-07-07
EP0055671B2 (en) 1988-12-07
JPS57135400A (en) 1982-08-20

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