EP0333607A1 - Device for dynamic confinement - Google Patents

Device for dynamic confinement Download PDF

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Publication number
EP0333607A1
EP0333607A1 EP89420095A EP89420095A EP0333607A1 EP 0333607 A1 EP0333607 A1 EP 0333607A1 EP 89420095 A EP89420095 A EP 89420095A EP 89420095 A EP89420095 A EP 89420095A EP 0333607 A1 EP0333607 A1 EP 0333607A1
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EP
European Patent Office
Prior art keywords
orifice
edge
suction
profile
gutter
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.)
Ceased
Application number
EP89420095A
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German (de)
French (fr)
Inventor
Jean-Pierre Crespin
Frédéric Saulay
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Polinorsud
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Polinorsud
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Publication date
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Publication of EP0333607A1 publication Critical patent/EP0333607A1/en
Ceased legal-status Critical Current

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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/5762—With leakage or drip collecting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/598—With repair, tapping, assembly, or disassembly means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems

Definitions

  • the present invention relates to a dynamic confinement device, outside and in the vicinity of an orifice of a through cavity, for example the opening of a valve.
  • a containment device comprising: - A suction collecting means, placed on the edge of the orifice of the through cavity, in this case the open vessel of a nuclear reactor; this collector means comprises two collector rings arranged vis-a-vis on said edge, but separated one of the other, having together an open profile along a diameter of the circular opening of the reactor, this profile corresponding to the contour of the edge of the latter; each ring has a U-shaped cross section open towards the interior of the reactor, and has several suction openings, always directed towards the interior of the reactor; - A plurality of outlet conduits each communicating, on one side with a single discharge conduit, connected to a pressure reducing means, and on the other side with the opening of a collector.
  • This device made up of rigid elements, is installed at a fixed position throughout the duration of the work. As such, this device can not be used in a mobile site, repeatedly requiring the assembly and disassembly by the operator of any dynamic containment device. In addition, the installation of the latter must be done quickly, to limit the doses integrated by the operator in an ionizing medium.
  • the present invention therefore relates to a dynamic confinement device, which can be mounted and dismantled at will, in a particularly simple and rapid manner.
  • the collecting means is composed of a plurality of unitary elements, which can be placed adjacent to the edge of the orifice, each comprising a suction opening, and a corresponding plurality of flexible conduits. outlet connect said openings to a single link adapter, connected to the exhaust duct.
  • a containment device according to the invention also provides the following advantages.
  • Aus Figures 1, 2 and 4 there is shown a contaminated circuit, for example the primary circuit of a nuclear power plant, in the form of two conduits (1) and (2), connected together by a valve (3), disassembled, so that it constitutes within the meaning of the present invention a through cavity (3a) by an orifice (3b) having an edge (3c).
  • a contaminated circuit for example the primary circuit of a nuclear power plant, in the form of two conduits (1) and (2), connected together by a valve (3), disassembled, so that it constitutes within the meaning of the present invention a through cavity (3a) by an orifice (3b) having an edge (3c).
  • a dynamic containment device is intended to be implemented outside and in the vicinity of an orifice such as (3b), of a through cavity such as (3a).
  • This device is mainly made of plastic, and includes: - A collecting means (4) by suction, having the shape of a gutter, whose closed circular profile corresponds to the circular contour of the edge (3c) of the orifice (3b) of the cavity (3a), the opening of this gutter (4) being directed towards the interior of the cavity (3a); - A plurality of outlet conduits (5), in the form of flexible pipes, arranged transversely relative to the direction of exit from the orifice (3a), in this case radially, and communicating with the interior of the gutter (4); - a connection adapter (6), more specifically shown in Figures 8 and 9, communicating, on one side with all the outlet conduits (5), and on the other side with a conduit (7) or sheath evacuation of a gas stream to a pressure-reducing means, for example a cycler, not shown.
  • the collector gutter (4) has a U-shaped profile whose interior is directed towards the center of the circumference along which the same gutter is shaped.
  • the gutter has a flat bottom (4a) and two perpendicular wings (4b) and (4c), spaced from one another.
  • Such a gutter is composed of a plurality of unit elements (8), made for example of plastic material, also in the shape of a U, and therefore having a flat bottom (8b) and two perpendicular wings (8c) (8d), one upper and the other lower; the flat bottom (8b) of an element (8) has a circular opening (8a) for suction, for the assembly by friction and elasticity of a flexible outlet pipe (5). All these unit elements (8), identical in their profile, their shape and their dimensions, are placed on the edge (3c), assembled and articulated adjacent to each other, according to the closed profile or not of the gutter, as shown in Figure 3.
  • all the lower wings (8d) of the different elements (8) are independent of each other, separated from each other, and partially overlap in the aforementioned conformation; the same is true for the upper wings (8c).
  • the straight bottoms (8b) of the different elements (8) are connected and articulated to each other, in a removable manner or not, for example by a hinge.
  • connecting adapter (6) shown in Figures 8 and 9, it is in the manner of a truncated cone and has a front face (6a) comprising a plurality of circular orifices (6b) each connected sealingly, for example by hard fitting, with the other end of said conduit opposite to the corresponding gutter element 8 (4).
  • the frusto-conical wall (6c) is itself assembled, in a leaktight manner, with the flexible evacuation conduit (7) towards the cycler.
  • the opening (6d) of the frusto-conical wall (6c) comprises a removable cover (20) for closing, making it possible to contain any contamination during the period of non-use of the device according to the invention.
  • each element (8) has a tab (8e) disposed outside the gutter (4), parallel to the straight bottom (8b), serving to support a collar (10a) (see Figure 7), which belts the different elements (8), placed on the edge (3c), and then assembled together in a joined manner.
  • the gutter (4) is assembled or obtained from the unitary elements (8) previously described, conforming to the geometry of the opening or border (3c) of the through cavity (3a); the gutter (4) is therefore ultimately of variable conformation.
  • This gutter (4) thus shaped is applied flat on the edge (3c), in a quasi-sealed manner between the lower wing (4b) and the edge (3c).
  • the cycler or pressure-reducing means is started, by means of which a gas stream is evacuated by the evacuation duct (7), from an external suction zone, constituted by the interior of the gutter (4), adjacent at the orifice (3b), towards the depressor means not shown.
  • the external suction zone defined above has a closed or non-closed contour, substantially identical to and adjacent to the edge (3c) of the orifice (3b) of the through cavity (3a), whereby, as shown by the arrows (11), the atmosphere within the cavity (3) is immediately sucked out of the latter, in transverse directions, in this case radial, relative to the direction of exit from the orifice (3a );
  • the atmosphere collected within the gutter (4) is distributed in a plurality of gaseous outlet veins, always in transverse directions, channeled by the conduits (5); -
  • the gaseous outlet streams are then brought together, by the connection adapter (6), according to the gas stream (7) towards the depressogenic means not shown; - immediately above the gutter (4), the ambient air is sucked in from above, inside the cavity (3a), and therefore repels, according to the arrows (12), all or part of the contaminated atmosphere, which could escape the suction of the gutter (4).
  • a total of effective dynamic confinement is therefore obtained, resulting in a virtual absence of contaminated atmosphere above the valve (3), in particular in the area where the operator is located.
  • the latter can therefore work without ventilated protective clothing, with simple gloves allowing it to penetrate into the cavity (3).
  • each element (8) consists of a nozzle (21) forming a rectangular suction mouth (21a), directed towards the inside of the through cavity (3a), once the nozzle has been placed on the edge (3c) as described below.
  • Each nozzle has a removable fixing member (21c), in the form of a lower tab located in the plane of the opening (21a).
  • Each end piece has a closing lid (22), making it possible to contain any contamination inside the containment device, during the period of non-use. of the last.
  • the containment device comprises a belt (24), with stapling means not shown of the two strands of the latter, the whole allowing to surround the edges (3c) of different diameters.
  • This belt comprises a plurality of hooking means (24), in the form of external gussets (24), making it possible to receive the tabs (21a) of the different end pieces (21) respectively.
  • each end piece (21), relative to the edge (3c), allows it to be temporarily removed from the latter, depending on the need for intervention on the through cavity, for example for the passage of a tool.
  • the present invention cannot be limited to the field of the nuclear industry, and can be applied in other industries where it is necessary to intervene on circuits containing a toxic residual atmosphere.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Manipulator (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Professional, Industrial, Or Sporting Protective Garments (AREA)

Abstract

La présente invention concerne un dispositif de confinement dynamique, à l'extérieur et au voisinage d'un orifice d'une cavité (3) débouchante, par exemple ouverture d'une vanne. Un dispositif selon l'invention comporte un moyeu collecteur (4) d'aspiration, comportant une pluralité d'éléments unitaires, dont le profil global correspond sensiblement au contour de la bordure (3c) de l'orifice de la cavité précitée, ainsi qu'une pluralité de conduits souples (5), communiquant d'une part avec chaque élément unitaire, et d'autre part avec un conduit d'aspiration (7). L'invention s'applique notamment à la décontamination partielle de circuits primaires d'une centrale nucléaire.The present invention relates to a dynamic containment device, outside and in the vicinity of an orifice of a through cavity (3), for example opening a valve. A device according to the invention comprises a collecting hub (4) for suction, comprising a plurality of unitary elements, the overall profile of which corresponds substantially to the contour of the edge (3c) of the orifice of the aforementioned cavity, as well as 'a plurality of flexible conduits (5), communicating on the one hand with each unitary element, and on the other hand with a suction conduit (7). The invention applies in particular to the partial decontamination of primary circuits of a nuclear power plant.

Description

La présente invention concerne un dispositif de confinement dynamique, à l'extérieur et au voisinage d'un orifice d'une cavité débou­chante, par exemple l'ouverture d'une vanne.The present invention relates to a dynamic confinement device, outside and in the vicinity of an orifice of a through cavity, for example the opening of a valve.

Dans l'industrie nucléaire ou chimique, lors de l'arrêt des installa­tions industrielles concernées, on procède à différentes opérations de maintenance, réparation ou entretien sur les circuits de circulation des fluides.In the nuclear or chemical industry, when the industrial installations concerned are shut down, various maintenance, repair or servicing operations are carried out on the fluid circulation circuits.

En fonctionnement, certains circuits des mêmes installations véhiculent des produits et matières toxiques, contaminantes, ou polluantes, et il ne suffit pas d'avoir évacué complètement les tuyaux, vannes ou enceintes sur lesquels un opérateur doit intervenir, pour protéger ce dernier contre tout contact avec les produits toxiques. Encore faut-il à tout endroit ouvert du circuit, au sein duquel l'opérateur intervient, aspirer en perma­nence l'atmosphère interne, pour diriger un flux gazeux toxique résiduel à l'écart de l'intervenant.In operation, certain circuits of the same installations carry toxic, contaminating or polluting products and materials, and it is not enough to have completely evacuated the pipes, valves or enclosures on which an operator must intervene, to protect the latter against any contact with toxic products. Still it is necessary at any open place of the circuit, within which the operator intervenes, to permanently aspirate the internal atmosphere, to direct a residual toxic gas flow away from the intervener.

Un exemple extrait de l'industrie nucléaire permettra de compren­dre les contraintes exprimées précédemment. Lors de l'arrêt d'une centrale nucléaire, après avoir évacué le circuit primaire de refroidissement, on intervient à différents endroits ouverts de ce dernier, par exemple dans l'ouverture d'une vanne, pour procéder manuellement à différentes opéra­tions de réparation ou entretien. L'atmosphère résiduelle interne, au sein du circuit ouvert, demeure contaminante, au sens où elle est assimilabble à une suspension de particules radio-actives, même si la radio-activité de ces dernières est souvent de période courte.An example from the nuclear industry will help understand the constraints expressed above. When a nuclear power plant is shut down, after having evacuated the primary cooling circuit, action is taken at different open places in the latter, for example in the opening of a valve, to carry out various repair operations manually or interview. The residual internal atmosphere, within the open circuit, remains contaminating, in the sense that it is comparable to a suspension of radioactive particles, even if the radioactivity of these latter is often of short period.

Une telle intervention doit donc avoir lieu en protégeant le corps de l'intervenant contre tout contact avec cette atmosphère résiduelle contaminante.Such an intervention must therefore take place while protecting the body of the intervener against any contact with this contaminating residual atmosphere.

A cette fin, conformément au brevet américain 3437558, et plus particulièrement selon le mode d'exécution décrit par référence à la Figure 4 de ce dernier, on a proposé un dispositif de confinement com­prenant :
- un moyen collecteur par aspiration, mis en place sur la bordure de l'orifice de la cavité débouchante, en l'occurence la cuve ouverte d'un réacteur nucléaire ; ce moyen collecteur comporte deux couronnes collec­trices disposées en vis-à-vis sur ladite bordure, mais séparées l'une de l'autre, ayant ensemble un profil ouvert selon un diamètre de l'ouverture circulaire du réacteur, ce profil correspondant au contour de la bordure de ce dernier ; chaque couronne a une section droite en U ouverte vers l'intérieur du réacteur, et comporte plusieurs ouvertures d'aspiration, toujours dirigées vers l'intérieur du réacteur ;
- une pluralité de conduits de sortie communiquant chacun, d'un côté avec un conduit unique d'évacuation, branché à un moyen déprimogène, et de l'autre côté avec l'ouverture d'un collecteur.To this end, in accordance with American patent 3437558, and more particularly according to the embodiment described with reference to FIG. 4 of the latter, a containment device has been proposed comprising:
- A suction collecting means, placed on the edge of the orifice of the through cavity, in this case the open vessel of a nuclear reactor; this collector means comprises two collector rings arranged vis-a-vis on said edge, but separated one of the other, having together an open profile along a diameter of the circular opening of the reactor, this profile corresponding to the contour of the edge of the latter; each ring has a U-shaped cross section open towards the interior of the reactor, and has several suction openings, always directed towards the interior of the reactor;
- A plurality of outlet conduits each communicating, on one side with a single discharge conduit, connected to a pressure reducing means, and on the other side with the opening of a collector.

Ce dispositif, constitué d'éléments rigides, est installé à poste fixe pendant toute la durée du chantier. Comme tel, ce dispositif ne peut être utilisé dans un chantier mobile, nécessitant de manière répétée le montage et le démontage par l'opérateur de tout dispositif de confinement dynamique. Au surplus, la mise en place de ce dernier doit être faite rapidement, pour limiter les doses intégrées par l'opérateur en milieu ionisant.This device, made up of rigid elements, is installed at a fixed position throughout the duration of the work. As such, this device can not be used in a mobile site, repeatedly requiring the assembly and disassembly by the operator of any dynamic containment device. In addition, the installation of the latter must be done quickly, to limit the doses integrated by the operator in an ionizing medium.

La présente invention a donc pour objet un dispositif de confine­ment dynamique, montable et démontable à volonté, de manière particu­lièrement simple et rapide.The present invention therefore relates to a dynamic confinement device, which can be mounted and dismantled at will, in a particularly simple and rapid manner.

Selon la présente invention, le moyen collecteur est composé d'une pluralité d'éléments unitaires, pouvant être mis en place de manière adjacente sur la bordure de l'orifice, comprenant chacun une ouverture d'aspiration, et une pluralité correspondante de conduits souples de sortie relient lesdites ouvertures à un adaptateur unique de liaison, connecté au conduit d'évacuation.According to the present invention, the collecting means is composed of a plurality of unitary elements, which can be placed adjacent to the edge of the orifice, each comprising a suction opening, and a corresponding plurality of flexible conduits. outlet connect said openings to a single link adapter, connected to the exhaust duct.

Un dispositif de confinement selon l'invention apporte, en outre, les avantages suivants.A containment device according to the invention also provides the following advantages.

Tout d'abord, sa conception modulaire permet de le replier avec un encombrement en volume limité, ce qui améliore les possibilités de circulation sur le chantier d'intervention.First of all, its modular design allows it to be folded up with a limited volume footprint, which improves the possibilities of circulation on the intervention site.

Ensuite, il peut être réalisé en matière plastique, ce qui évite toute agression ou érosion de l'environnement, à même de "récolter" des poussières contaminantes.Then, it can be made of plastic, which avoids any attack or erosion of the environment, able to "collect" contaminating dust.

La présente invention est maintenant décrite par référence aux dessins annexés, dans lesquelles:

  • - la Figure 1 représente un dispositif de confinement conforme à la présente invention, selon un premier mode d'exécution de cette dernière partiellement en coupe, en position sur la bordure d'un orifice d'une cavité débouchante, en l'occurence une vanne ouverte ;
  • - la Figure 2 représente, en vue de dessus, le dispositif de confine­ment représenté à la Figure 1 ;
  • - la Figure 3 représente de manière simplifiée le moyen collecteur en forme de gouttière, appartenant au dispositif de confinement représenté aux Figures 1 et 2 ;
  • - la Figure 4 explicite le fonctionnement d'un dispositif de confi­nement dynamique selon les Figures 1 à 3.
  • - la Figure 5 représente une vue de face d'un élément unitaire appartenant au moyen collecteur d'un dispositif de confinement selon un deuxième mode d'exécution de la présente invention ;
  • - la Figure 6 représente une vue de côté de l'élément unitaire représenté à la Figure 5 ;
  • - la Figure 7 représente le mode d'assemblage des éléments unitaires selon les Figures 5 et 6, pour former un moyen collecteur d'évacu­ation selon ce deuxième mode d'exécution de l'invention ;
  • la Figure 8 représente une vue de face d'un adaptateur de liaison appartenant à un dispositif de confinement dynamique selon l'inven­tion ;
  • - la Figure 9 représente une vue en coupe verticale de l'adaptateur représenté à la Figure 8 ;
  • - la Figure 10 représente une vue en coupe verticale d'un autre adaptateur conforme à la présente invention ;
  • - la Figure 11 représente une vue en perspective d'un moyen collecteur d'évacuation selon un troisième mode d'exécution de l'invention ;
  • - la Figure 12 représente une vue de dessus du moyen collecteur selon la Figure 11, mis en place sur l'ouverture d'une vanne ouverte.
The present invention is now described with reference to the accompanying drawings, in which:
  • - Figure 1 shows a containment device according to the present invention, according to a first embodiment of the latter partially in section, in position on the edge of an orifice of a through cavity, in this case an open valve;
  • - Figure 2 shows, in top view, the containment device shown in Figure 1;
  • - Figure 3 shows in a simplified way the collecting means in the form of gutter, belonging to the containment device shown in Figures 1 and 2;
  • - Figure 4 explains the operation of a dynamic containment device according to Figures 1 to 3.
  • - Figure 5 shows a front view of a unit element belonging to the collecting means of a containment device according to a second embodiment of the present invention;
  • - Figure 6 shows a side view of the unit element shown in Figure 5;
  • - Figure 7 shows the method of assembling the unit elements according to Figures 5 and 6, to form a discharge collecting means according to this second embodiment of the invention;
  • Figure 8 shows a front view of a link adapter belonging to a dynamic containment device according to the invention;
  • - Figure 9 shows a vertical sectional view of the adapter shown in Figure 8;
  • - Figure 10 shows a vertical sectional view of another adapter according to the present invention;
  • - Figure 11 shows a perspective view of an evacuation collecting means according to a third embodiment of the invention;
  • - Figure 12 shows a top view of the collecting means according to Figure 11, placed on the opening of an open valve.

Aus Figures 1, 2 et 4, on a représenté un circuit contaminé, par exemple le circuit primaire d'une centrale nucléaire, sous la forme de deux conduits (1) et (2), reliées entre elles par une vanne (3), démontée, de telle sorte qu'elle constitue au sens de la présente invention une cavité débouchante (3a) par un orifice (3b) comportant une bordure (3c).Aus Figures 1, 2 and 4, there is shown a contaminated circuit, for example the primary circuit of a nuclear power plant, in the form of two conduits (1) and (2), connected together by a valve (3), disassembled, so that it constitutes within the meaning of the present invention a through cavity (3a) by an orifice (3b) having an edge (3c).

Un dispositif de confinement dynamique selon la présente invention est destiné à être mis en oeuvre à l'extérieur et au voisinage d'un orifice tel que (3b), d'une cavité débouchante telle que (3a). Ce dispositif est réalisé pour l'essentiel en matière plastique, et comprend :
- un moyen collecteur (4) par aspiration, ayant la forme d'une gouttière, dont le profil circulaire fermé correspond au contour circulaire de la bordure (3c) de l'orifice (3b) de la cavité (3a), l'ouverture de cette gouttière (4) étant dirigée vers l'intérieur de la cavité (3a) ;
- une pluralité de conduits de sortie (5), ayant la forme de tuyaux souples, disposés transversalement par rapport à la direction de sortie de l'orifice (3a), en l'occurence radialement, et communiquant avec l'inté­rieur de la gouttière (4) ;
- un adaptateur de liaison (6), plus spécifiquement représenté aux Figures 8 et 9, communiquant, d'un côté avec tous les conduits de sortie (5), et de l'autre côté avec un conduit (7) ou gaine d'évacuation d'un courant gazeux vers un moyen déprimogène, par exemple un cycleur, non représenté.A dynamic containment device according to the present invention is intended to be implemented outside and in the vicinity of an orifice such as (3b), of a through cavity such as (3a). This device is mainly made of plastic, and includes:
- A collecting means (4) by suction, having the shape of a gutter, whose closed circular profile corresponds to the circular contour of the edge (3c) of the orifice (3b) of the cavity (3a), the opening of this gutter (4) being directed towards the interior of the cavity (3a);
- A plurality of outlet conduits (5), in the form of flexible pipes, arranged transversely relative to the direction of exit from the orifice (3a), in this case radially, and communicating with the interior of the gutter (4);
- a connection adapter (6), more specifically shown in Figures 8 and 9, communicating, on one side with all the outlet conduits (5), and on the other side with a conduit (7) or sheath evacuation of a gas stream to a pressure-reducing means, for example a cycler, not shown.

Au plan de la réalisation comme montré à la Figure 3, la gouttière collectrice (4) a un profil en U dont l'intérieur est dirigé vers le centre de la circonférence selon laquelle la même gouttière est conformée. En profil transversal, plus précisément, la gouttière présente un fond plat (4a) et deux ailes perpendiculaires (4b) et (4c), espacées l'une de l'autre. Une telle gouttière est composée d'une pluralité d'éléments unitaires (8), réalisés par exemple en matière plastique, également en forme de U, et présentant donc un fond plat (8b) et deux ailes (8c) (8d) perpendicu­laires, l'une supérieure et l'autre inférieure ; le fond plat (8b) d'un élément (8) comporte une ouverture circulaire (8a) d'aspiration, pour l'assemblage par frottement et élasticité d'un tuyau souple (5) de sortie. Tous ces éléments unitaires (8), identiques quant à leur profil, leur forme et leurs dimensions, sont mis en place sur la bordure (3c), assemblés et articulés de manière adjacente, les uns aux autres, selon le profil fermé ou non de la gouttière, comme représenté à la Figure 3.In terms of embodiment as shown in Figure 3, the collector gutter (4) has a U-shaped profile whose interior is directed towards the center of the circumference along which the same gutter is shaped. In transverse profile, more precisely, the gutter has a flat bottom (4a) and two perpendicular wings (4b) and (4c), spaced from one another. Such a gutter is composed of a plurality of unit elements (8), made for example of plastic material, also in the shape of a U, and therefore having a flat bottom (8b) and two perpendicular wings (8c) (8d), one upper and the other lower; the flat bottom (8b) of an element (8) has a circular opening (8a) for suction, for the assembly by friction and elasticity of a flexible outlet pipe (5). All these unit elements (8), identical in their profile, their shape and their dimensions, are placed on the edge (3c), assembled and articulated adjacent to each other, according to the closed profile or not of the gutter, as shown in Figure 3.

Selon le mode d'exécution représenté aux Figures 1 à 4, toutes les ailes inférieures (8d) des différents éléments (8) sont indépendantes entre elles, séparées les unes des autres, et se recouvrent partiellement dans la conformation précitée ; il en est de même pour les ailes supérieures (8c). Et les fonds droits (8b) des différents éléments (8) sont reliés et articulés les uns aux autres, de manière démontable ou non, par exemple par une charnière.According to the embodiment shown in Figures 1 to 4, all the lower wings (8d) of the different elements (8) are independent of each other, separated from each other, and partially overlap in the aforementioned conformation; the same is true for the upper wings (8c). And the straight bottoms (8b) of the different elements (8) are connected and articulated to each other, in a removable manner or not, for example by a hinge.

Quant à l'adapteur de liaison (6) représenté aux Figures 8 et 9, il se présente à la manière d'un tronc de cône et comporte une face frontale (6a) comportant une pluralité d'orifices circulaires (6b) connectés chacun de manière étanche, par exemple par emmanchement dur, avec l'autre extrêmité dudit conduit opposée à l'élément 8 correspondant de gouttière (4). La paroi troncônique (6c) est elle-même assemblée, de manière étanche, avec le conduit souple d'évacuation (7) vers le cycleur.As for the connecting adapter (6) shown in Figures 8 and 9, it is in the manner of a truncated cone and has a front face (6a) comprising a plurality of circular orifices (6b) each connected sealingly, for example by hard fitting, with the other end of said conduit opposite to the corresponding gutter element 8 (4). The frusto-conical wall (6c) is itself assembled, in a leaktight manner, with the flexible evacuation conduit (7) towards the cycler.

Conformément à la Figure 10, l'ouverture (6d) de la paroi troncôni­que (6c) comporte un couvercle (20) amovible de fermeture, permettant de contenir toute contamination pendant la période d'inutilisation du disposi­tif selon l'invention.According to FIG. 10, the opening (6d) of the frusto-conical wall (6c) comprises a removable cover (20) for closing, making it possible to contain any contamination during the period of non-use of the device according to the invention.

Conformément aux modes d'exécution selon les Figures 5 et 6, et par différence au premier mode d'exécution décrit précédemment, au départ, tous les éléments unitaires (8) sont indépendants les uns des autres, tout en présentant un profil en U comme décrit précédemment. Mais chaque élément (8) comporte une patte (8e) disposée à l'extérieur de la gouttière (4), parallèlement au fond droit (8b), servant à l'appui d'un collier (10a) (conférer Figure 7), lequel ceinture les différents éléments (8), mis en place sur la bordure (3c), et alors assemblés entre eux de ma­nière jointive.In accordance with the embodiments according to Figures 5 and 6, and by difference to the first embodiment described above, at the start, all the unit elements (8) are independent of each other, while presenting a U-shaped profile as described previously. But each element (8) has a tab (8e) disposed outside the gutter (4), parallel to the straight bottom (8b), serving to support a collar (10a) (see Figure 7), which belts the different elements (8), placed on the edge (3c), and then assembled together in a joined manner.

Il doit être entendu que le profil épousé par la gouttière (4), en correspondance avec la bordure (3c), peut être fermé comme représenté à la Figure 2, ou ouvert à tous endroits appropriés, comme représenté à la Figure 3.It should be understood that the profile espoused by the gutter (4), in correspondence with the edge (3c), can be closed as shown in Figure 2, or open in all appropriate places, as shown in Figure 3.

La mise en oeuvre d'un dispositif de confinement tel que précé­demment décrit intervient de la manière suivante.The implementation of a containment device as previously described takes place in the following manner.

La gouttière (4) est assemblée ou obtenue à partir des éléments unitaires (8) précédemment décrits, en se conformant à la géométrie de l'ouverture ou bordure (3c) de la cavité débouchante (3a) ; la gouttière (4) est donc en définitive à conformation variable. Cette gouttière (4) ainsi conformée est appliquée à plat sur la bordure (3c), de manière quasi-­étanche entre l'aile inférieure (4b) et la bordure (3c). Puis le cycleur ou moyen déprimogène est mis en route, moyennant quoi on évacue un courant gazeux par le conduit d'évacuation (7), d'une zone extérieure d'aspiration, constituée par l'intérieur de la gouttière (4), adjacente à l'orifice (3b), vers le moyen déprimogène non représenté.The gutter (4) is assembled or obtained from the unitary elements (8) previously described, conforming to the geometry of the opening or border (3c) of the through cavity (3a); the gutter (4) is therefore ultimately of variable conformation. This gutter (4) thus shaped is applied flat on the edge (3c), in a quasi-sealed manner between the lower wing (4b) and the edge (3c). Then the cycler or pressure-reducing means is started, by means of which a gas stream is evacuated by the evacuation duct (7), from an external suction zone, constituted by the interior of the gutter (4), adjacent at the orifice (3b), towards the depressor means not shown.

Plus précisément :
- la zone extérieure d'aspiration définie précédemment a un contour fermé ou non, sensiblement identique à et adjacent à la bordure (3c) de l'orifice (3b) de la cavité débouchante (3a), moyennant quoi, comme représenté par les flèches (11), l'atmosphère au sein de la cavité (3) est immédiatement aspirée à l'extérieur de cette dernière, dans des directions transversales, en l'occurence radiales, par rapport à la direction de sortie de l'orifice (3a) ;
- l'atmosphère collectée au sein de la gouttière (4) est distribuée en une pluralité de veines gazeuses de sortie, toujours de directions trans­versales, canalisées par les conduits (5) ;
- les veines gazeuses de sortie sont ensuite rassemblées, par l'adaptateur de liaison (6), selon le courant gazeux (7) vers le moyen dépri­mogène non représenté ;
- immédiatement au-dessus de la gouttière (4), l'air ambiant est aspiré par le haut, à l'intérieur de la cavité (3a), et repousse de ce fait, selon les flèches (12), tout ou partie de l'atmosphère contaminée, qui serait susceptible d'échapper à l'aspiration de la gouttière (4).More precisely :
- the external suction zone defined above has a closed or non-closed contour, substantially identical to and adjacent to the edge (3c) of the orifice (3b) of the through cavity (3a), whereby, as shown by the arrows (11), the atmosphere within the cavity (3) is immediately sucked out of the latter, in transverse directions, in this case radial, relative to the direction of exit from the orifice (3a );
- The atmosphere collected within the gutter (4) is distributed in a plurality of gaseous outlet veins, always in transverse directions, channeled by the conduits (5);
- The gaseous outlet streams are then brought together, by the connection adapter (6), according to the gas stream (7) towards the depressogenic means not shown;
- immediately above the gutter (4), the ambient air is sucked in from above, inside the cavity (3a), and therefore repels, according to the arrows (12), all or part of the contaminated atmosphere, which could escape the suction of the gutter (4).

On obtient donc au total un confinement dynamique efficace, résultant en une quasi-absence d'atmosphère contaminée au-dessus de la vanne (3), en particulier dans la zone où se trouve l'opérateur. Ce dernier peut donc travailler sans tenue de protection ventilée, avec de simples gants lui permettant de pénétrer au sein de la cavité (3).A total of effective dynamic confinement is therefore obtained, resulting in a virtual absence of contaminated atmosphere above the valve (3), in particular in the area where the operator is located. The latter can therefore work without ventilated protective clothing, with simple gloves allowing it to penetrate into the cavity (3).

Selon le troisième mode d'exécution de l'invention, et par référence aux Figures 11 et 12, les différents éléments unitaires (8) du collecteur sont totalement indépendants les uns des autres. Chaque élément (8) consiste en un embout (21) formant bouche (21a) rectangulaire d'aspiration, dirigée vers l'intérieur de la cavité débouchante (3a), une fois l'embout mis en place sur la bordure (3c) comme décrit ci-après. La partie (21b) de l'embout (21), de forme tubulaire, opposée à l'ouverture (21a), forme une ouverture (8a) reliée à un conduit souple de sortie (5). Chaque embout comporte un organe (21c) de fixation amovible, ayant la forme d'une patte inférieure située dans le plan de l'ouverture (21a). Chaque embout comporte un couvercle (22) de fermeture, permettant de contenir toute contamination à l'intérieur du dispositif de confinement, pendant la période d'inutilisation de ce dernier.According to the third embodiment of the invention, and with reference to Figures 11 and 12, the different unit elements (8) of the manifold are completely independent of each other. Each element (8) consists of a nozzle (21) forming a rectangular suction mouth (21a), directed towards the inside of the through cavity (3a), once the nozzle has been placed on the edge (3c) as described below. The part (21b) of the end piece (21), of tubular shape, opposite the opening (21a), forms an opening (8a) connected to a flexible outlet duct (5). Each nozzle has a removable fixing member (21c), in the form of a lower tab located in the plane of the opening (21a). Each end piece has a closing lid (22), making it possible to contain any contamination inside the containment device, during the period of non-use. of the last.

Par ailleurs, le dispositif de confinement comporte une ceinture (24), avec des moyens d'agrafage non représentés des deux brins de cette dernière, le tout permettant de ceinturer des bordures (3c) de différents diamètres. Cette ceinture comporte une pluralité de moyens d'accrochage (24), sous la forme de goussets extérieurs (24), permettant de recevoir les pattes (21a) des différents embouts (21) respectivement.Furthermore, the containment device comprises a belt (24), with stapling means not shown of the two strands of the latter, the whole allowing to surround the edges (3c) of different diameters. This belt comprises a plurality of hooking means (24), in the form of external gussets (24), making it possible to receive the tabs (21a) of the different end pieces (21) respectively.

Ainsi, selon ce mode d'exécution, il est possible de disposer à volonté les embouts (21) en vis-à-vis de la bordure (3c), pour obtenir un moyen collecteur (4) selon la configuration au profil désiré par l'opérateur. Au surplus, le caractère amovible de chaque embout (21), par rapport à la bordure (3c), permet de le retirer temporairement de cette dernière, en fonction des nécessités d'intervention sur la cavité débouchante, par exemple pour le passage d'un outillage.Thus, according to this embodiment, it is possible to arrange at will the end pieces (21) facing the border (3c), to obtain a collecting means (4) according to the configuration with the profile desired by the 'operator. In addition, the removable nature of each end piece (21), relative to the edge (3c), allows it to be temporarily removed from the latter, depending on the need for intervention on the through cavity, for example for the passage of a tool.

Comme indiqué précédemment, la présente invention ne saurait être limitée au domaine de l'industrie nucléaire, et peut recevoir applica­tion dans d'autres industries où il est nécessaire d'intervenir sur des circuits contenant une atmosphère résiduelle toxique.As indicated previously, the present invention cannot be limited to the field of the nuclear industry, and can be applied in other industries where it is necessary to intervene on circuits containing a toxic residual atmosphere.

Claims (7)

1- Dispositif de confinement dynamique, destiné à une mise en oeuvre à l'extérieur et au voisinage d'un orifice (3b) d'une cavité débou­chante (3a), par exemple l'ouverture (3a) d'une vanne, comprenant:
- un moyen collecteur (4) par aspiration, destiné à une mise en place sur la bordure (3c) de l'orifice, et ayant une fois mis en place un profil fermé ou non, correspondant au contour de ladite bordure, ledit moyen comprenant au moins deux ouvertures d'aspiration (8a) dirigées vers l'intérieur de la cavité débouchante ;
- au moins deux conduits (5) de sortie communiquant chacun, d'un côté avec un conduit (7) d'évacuation destiné à être branché à un moyen déprimogène, et de l'autre côté, avec une ouverture (8a) du collec­teur,
caractérisé en ce que le moyen collecteur (4) est composé d'une pluralité d'éléments unitaires (8), pouvant être mis en place de manière adjacente sur la bordure (3c) de l'orifice, comprenant chacun une ouverture (8a) d'aspiration, et une pluralité correspondante de conduits souples (5) de sortie relient lesdites ouvertures à un adapteur (6) unique de liaison, connec­té au conduit d'évacuation (7).1- Dynamic confinement device, intended for use outside and in the vicinity of an orifice (3b) of a through cavity (3a), for example the opening (3a) of a valve, comprising :
- A collecting means (4) by suction, intended for positioning on the edge (3c) of the orifice, and having once set up a closed profile or not, corresponding to the outline of said edge, said means comprising at least two suction openings (8a) directed towards the inside of the through cavity;
- at least two outlet conduits (5) each communicating, on one side with a discharge conduit (7) intended to be connected to a pressure-reducing means, and on the other side, with an opening (8a) in the collector ,
characterized in that the collecting means (4) is composed of a plurality of unit elements (8), which can be placed adjacent to the edge (3c) of the orifice, each comprising an opening (8a) suction, and a corresponding plurality of flexible outlet conduits (5) connect said openings to a single connecting adapter (6), connected to the discharge conduit (7). 2- Dispositif selon la revendication 1, caractérisé en ce que chaque élément unitaire (8) a la forme d'une gouttière, dirigée vers l'intérieur de l'orifice (3a), une fois ledit élément mis en place sur la bordure (3c) dudit orifice.2- Device according to claim 1, characterized in that each unit element (8) has the shape of a gutter, directed towards the inside of the orifice (3a), once said element placed on the edge ( 3c) of said orifice. 3- Dispositif selon la revendication 2, caractérisé en ce que les éléments unitaires (8), ayant le même profil, peuvent être assemblés les uns aux autres selon le profil de la bordure (3c) de l'orifice.3- Device according to claim 2, characterized in that the unit elements (8), having the same profile, can be assembled to each other according to the profile of the edge (3c) of the orifice. 4- Dispositif selon la revendication 2, caractérisé en ce que les éléments unitaires (8), ayant le même profil, sont articulés les uns aux autres selon le profil de la bordure (3c) de l'orifice.4- Device according to claim 2, characterized in that the unit elements (8), having the same profile, are hinged to each other according to the profile of the edge (3c) of the orifice. 5- Dispositif selon la revendication 4, caractérisé en ce que chaque élément unitaire (8) comporte une patte disposée à l'extérieur de la goutti­ère, servant à l'appui d'un collier (10) ceinturant les différents éléments articulés les uns aux autres.5- Device according to claim 4, characterized in that each unit element (8) has a tab disposed outside of the gutter, serving to support a collar (10) surrounding the various elements hinged to each other. 6- Dispositif selon la revendication 1, caractérisé en ce que chaque élément unitaire (8) est un embout (21) formant bouche d'aspiration, dirigée vers l'intérieur de l'orifice (3a), une fois ledit élément mis en place sur la bordure dudit orifice.6- Device according to claim 1, characterized in that each unit element (8) is a nozzle (21) forming a suction mouth, directed towards the inside of the orifice (3a), once said element is in place sure the edge of said orifice. 7- Dispositif selon la revendication 1, caractérisé en ce que les éléments unitaires (8) sont indépendants les uns des autres, et comportent chacun un organe (21c) de fixation amovible, et une ceinture de fixation (23) est prévue en outre pour ceinturer la bordure (3c) de l'orifice, et comporte une pluralité de moyens (24) d'accrochage des différents organes de fixation respectivement.7- Device according to claim 1, characterized in that the unitary elements (8) are independent of each other, and each comprise a member (21c) removable fixing, and a fixing belt (23) is further provided for surround the edge (3c) of the orifice, and comprises a plurality of means (24) for hooking the various fixing members respectively.
EP89420095A 1988-03-18 1989-03-16 Device for dynamic confinement Ceased EP0333607A1 (en)

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FR8803841A FR2628656B1 (en) 1988-03-18 1988-03-18 DYNAMIC CONTAINMENT METHOD AND DEVICE
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FR2628656B1 (en) 1991-05-31
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