EP3921853B1 - Radio-protective shield - Google Patents

Radio-protective shield Download PDF

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Publication number
EP3921853B1
EP3921853B1 EP20709643.9A EP20709643A EP3921853B1 EP 3921853 B1 EP3921853 B1 EP 3921853B1 EP 20709643 A EP20709643 A EP 20709643A EP 3921853 B1 EP3921853 B1 EP 3921853B1
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EP
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Prior art keywords
radio
face
protective shield
wall
transparent material
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EP20709643.9A
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German (de)
French (fr)
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EP3921853A1 (en
Inventor
Pierre-Marie Lemer
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Lemer Pax
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Lemer Pax
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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
    • G21F7/00—Shielded cells or rooms
    • G21F7/02—Observation devices permitting vision but shielding the observer
    • G21F7/03—Windows, e.g. shielded
    • 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
    • G21F7/00—Shielded cells or rooms
    • G21F7/02—Observation devices permitting vision but shielding the observer

Definitions

  • the present invention relates to the technical field of protection against ionizing radiation.
  • It relates more particularly to a radio-protective screen intended to be fixed on the periphery of an opening made in a wall separating a space subjected to ionizing radiation (known as hot space), and a space not subjected to ionizing radiation (known as cold).
  • hot space a space subjected to ionizing radiation
  • cold a space not subjected to ionizing radiation
  • a shielded cell partitioning a space subjected to ionizing radiation comprising a metallic interior lining and at least one anti-radiation window allowing visual access from the outside to the interior of said shielded cell, which anti-radiation window comprises a sheath embedded in a concrete wall, which sheath receives a shielded window which is associated with a radio-protective screen fixed on the periphery of an opening made in said metallic interior coating.
  • These shielded cells are surrounded by walls adapted to provide effective protection against ionizing radiation, and they generally include at least one window allowing visual inspection, from the outside, of the operations carried out internally (see for example US 7,257,927 , EP 0 430 687 , US 3,505,525 , FR 1 333 746 ).
  • Such windows can comprise a sheath, embedded in a concrete wall, which sheath receives a shielded porthole composed of a cast iron frame incorporating a plurality of anti-radiation glass slabs.
  • the shielded enclosure may include a radio-protective screen, positioned facing the shielded window.
  • This radio-protective screen also referred to as “alpha glass” is fixed around the perimeter of an opening made in a metal interior lining which covers the walls of the shielded enclosure.
  • the radio-protective screen in question comprises a wall made of transparent material, the periphery of which is sandwiched in a carrier assembly composed of a fixing frame and a counter-frame, allowing fixing by welding with the internal lining of the shielded enclosure.
  • the wall made of transparent radio-protective material is delimited by a first face, intended to be oriented towards the outside “cold space” side, and by a second face intended to be oriented towards the inside “hot space” side.
  • a peripheral edge of this first wall face bears against a bearing face of the counter-frame by via a seal made of organic material (usually EPDM or neoprene).
  • the fixing frame is provided with support means, with a seal, against a peripheral edge of the second face of the wall made of transparent material.
  • the seals interposed between the transparent material wall of the radio-protective screen and the counter-frame and fixing frame degrade fairly quickly over time, due to the high doses of radiation to which they are subjected, and it is necessary to replace them regularly, which, in the context, is not easy to achieve and is a source of significant costs.
  • seals with good resistance to ionizing radiation in particular seals made of inorganic material (advantageously seals made of soft metal, that is to say malleable or ductile, chosen from lead, copper, tin or cadmium, in the pure state or in the form of an alloy), or graphite gaskets.
  • the present invention also relates to a shielded cell partitioning a space subjected to ionizing radiation, comprising a metallic interior coating and at least one anti-radiation window allowing visual access from the outside to the interior of said shielded cell, which anti-radiation window -radiation comprises a sheath embedded in a concrete wall, which sheath receives a shielded porthole which is associated with a radio-protective screen as defined above, fixed on the periphery of an opening made in said metallic interior coating.
  • the shielded cell 1 illustrated on the figure 1 is delimited by concrete walls 2 (partially shown) in one of which is formed an anti-radiation window 3.
  • the concrete walls 2 have a significant thickness which can be up to 1.5 meters.
  • the anti-radiation window 3 is adapted to allow a person P located outside the shielded cell 1, on the cold space F side, to check operations carried out on radioactive products within the internal hot space C.
  • This anti-radiation window 3 comprises a sleeve 31 in the form of a metal frame, for example made of steel or cast iron, embedded in the concrete wall 2 of the shielded cell 1, this sleeve 31 receiving a shielded porthole 32 consisting of a block optic formed here by two slabs of lead glass 321 and 322.
  • the interior of the shielded cell 1 comprises a metal coating 4 in which is made an opening 41 facing the anti-radiation window 3, and on the periphery of which opening 41 is fixed by welding the periphery of a radio-protective screen 5, detailed on the figure 2 and 3 .
  • the metal coating 4, also called “casing”, is advantageously made of stainless steel.
  • the radio-protective screen 5 comprises a wall 6 of transparent material, delimited by a first face 61 intended to be oriented on the side of the cold space F of the shielded cell 1 (that is to say oriented towards the slabs of lead glass 321 and 322), and a second face 62 intended to be oriented towards the hot space C.
  • first and second faces 61, 62 of the wall 6 made of transparent material are connected by an edge 63.
  • the wall 6 in transparent material can be made of glass.
  • This radio-protective screen 5 further comprises a peripheral structure 7, formed of a counter-frame 8 and of a fixing frame 9, which peripheral structure 7 is adapted to hold the wall 6 made of transparent material and to allow its fixing to the metal covering 4 of shielded enclosure 1.
  • the periphery of the wall 6 made of transparent material is sandwiched between the counter-frame 8 and the fixing frame 9, and fastening means, here in the form of screws 10, ensure the fastening between these counter-frames 8 and mounting frame 9.
  • the periphery of the wall 6 in transparent material is positioned in a rebate 81 of the counter-frame 8, with a peripheral edge 611 of the first face 61 of this wall 6 in transparent material which is positioned in said rebate 81 , against a bearing surface 811 of the counter-frame 8, via a seal 11.
  • the periphery of the wall 6 made of transparent material is positioned in a rabbet 91 of the fixing frame 9, with a peripheral edge 621 of the second face 62 of this wall 6 made of transparent material which is positioned in said rebate 91, opposite the face 911 of a wing 912 of this rebate 91; and the fixing frame 9 is provided with means 12 for bearing against said peripheral edge 621 of the second face 62 of said wall 6 made of transparent material.
  • the added support profile 1212 is associated with the metal pressure profile 1211 by gluing or by simple interlocking of complementary shapes.
  • the elastic return means consist of a plurality of spring members in the form of Belleville washers 122 regularly or at least approximately regularly distributed around the periphery of the fixing frame 9, which are each interposed between the metal pressure profile 1211 and the end activates 1231 pressure adjustment screws 123.
  • the pressure adjustment screws 123 pass through the wing 912 of the rebate 91 of the fixing frame 9 via a threaded hole 9120. And the end 1232 of the pressure adjustment screws 123, which is opposite to that 1231 cooperating with the associated Belleville washer 122, is accessible from outside the fixing frame 9. This opposite end of the screw 1232 cooperates with a lock nut 124 and has a recess 1233 for its rotational operation by an appropriate tool (of the key type, screwdriver, etc.).
  • the metal pressure profile 1211 is for example made of steel, stainless steel (inox), bronze or brass.
  • the seals 11 and 1212 can be made of inorganic material. They can thus be made of soft metal (that is to say malleable/ductile), preferably chosen from lead, copper, tin or cadmium (in the pure state or in the form of alloys) . They can also be made of graphite. Preferably the two joint structures 11 and 1212 are made of the same material.
  • the fixing frame 9 and the counter-frame 8 are in contact with each other at the level of a contact plane 13 through which the fastening screws 10 pass.
  • These fastening screws 10 are regularly or at least approximately regularly distributed over the periphery of the fixing frame 9 and of the counter-frame 8, for example according to the same pitch as the pressure adjustment screws 123.
  • the radio-protective screen 5 can be fixed in the other direction on the peripheral edge of the opening 41, that is to say with the counter-frame 8 oriented on the hot space side.
  • C and the fixing frame 9 oriented on the cold space F side (in particular to allow the fixing frame 9 to be dismantled from the cold space F side).
  • the support means 12 make it possible to apply a permanent pressure on the seal 11 sandwiched between the wall 6 made of transparent material and the support face 811 of the rebate 81 of the counter-frame 8 , and also on the seal 1212 sandwiched between the wall 6 of transparent material and the fixing frame 9.
  • Such a feature allows the use of seals 11 and 1212 which resist well to ionizing radiation, but which, by their nature, may tend to crush or creep slightly over time.
  • the bearing means 12 then constitute an elastic creep compensation system by maintaining the pressure on the seals.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Securing Of Glass Panes Or The Like (AREA)
  • Building Environments (AREA)
  • Gasket Seals (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Description

Domaine technique de l'inventionTechnical field of the invention

La présente invention concerne le domaine technique de la protection contre les rayonnements ionisants.The present invention relates to the technical field of protection against ionizing radiation.

Elle concerne plus particulièrement un écran radio-protecteur destiné à être fixé sur le pourtour d'une ouverture ménagée dans une paroi séparant un espace soumis à des rayonnements ionisants (dit espace chaud), et un espace non soumis à des rayonnements ionisants (dit espace froid).It relates more particularly to a radio-protective screen intended to be fixed on the periphery of an opening made in a wall separating a space subjected to ionizing radiation (known as hot space), and a space not subjected to ionizing radiation (known as cold).

Elle concerne encore une cellule blindée cloisonnant un espace soumis à des rayonnements ionisants, comprenant un revêtement intérieur métallique et au moins une fenêtre anti-radiation autorisant un accès visuel de l'extérieur vers l'intérieur de ladite cellule blindée, laquelle fenêtre anti-radiation comprend un fourreau noyé dans une paroi en béton, lequel fourreau reçoit un hublot blindé qui est associé à un écran radio-protecteur fixé sur le pourtour d'une ouverture ménagée dans ledit revêtement intérieur métallique.It also relates to a shielded cell partitioning a space subjected to ionizing radiation, comprising a metallic interior lining and at least one anti-radiation window allowing visual access from the outside to the interior of said shielded cell, which anti-radiation window comprises a sheath embedded in a concrete wall, which sheath receives a shielded window which is associated with a radio-protective screen fixed on the periphery of an opening made in said metallic interior coating.

Etat de la techniqueState of the art

Dans certaines usines de retraitement de déchets, ou certains laboratoires, il existe des cellules blindées au sein desquelles on réalise des opérations sur des matériaux radioactifs.In some waste reprocessing plants, or some laboratories, there are shielded cells in which operations are carried out on radioactive materials.

Ces cellules blindées sont entourées de parois adaptées pour assurer une protection efficace à l'encontre des rayonnements ionisants, et elles comprennent généralement au moins une fenêtre autorisant un contrôle visuel, depuis l'extérieur, des opérations réalisées en interne (voir par exemple US 7 257 927 , EP 0 430 687 , US 3 505 525 , FR 1 333 746 ).These shielded cells are surrounded by walls adapted to provide effective protection against ionizing radiation, and they generally include at least one window allowing visual inspection, from the outside, of the operations carried out internally (see for example US 7,257,927 , EP 0 430 687 , US 3,505,525 , FR 1 333 746 ).

De telles fenêtres (dénommées fenêtres anti-radiation) peuvent comprendre un fourreau, noyé dans une paroi en béton, lequel fourreau reçoit un hublot blindé composé d'une monture en fonte intégrant une pluralité de dalles de verre anti-radiation.Such windows (called anti-radiation windows) can comprise a sheath, embedded in a concrete wall, which sheath receives a shielded porthole composed of a cast iron frame incorporating a plurality of anti-radiation glass slabs.

De plus, côté intérieur (encore dénommé « espace chaud »), l'enceinte blindée peut comporter un écran radio-protecteur, positionné en regard du hublot blindé. Cet écran radio-protecteur (encore dénommé « glace alpha »), est fixé sur le pourtour d'une ouverture ménagée dans un revêtement intérieur métallique qui recouvre les parois de l'enceinte blindée.In addition, on the interior side (also referred to as the “hot space”), the shielded enclosure may include a radio-protective screen, positioned facing the shielded window. This radio-protective screen (also referred to as “alpha glass”) is fixed around the perimeter of an opening made in a metal interior lining which covers the walls of the shielded enclosure.

L'écran radio-protecteur en question comprend une paroi en matériau transparent dont le pourtour est pris en sandwich dans un ensemble porteur composé d'un cadre de fixation et d'un contre-cadre, permettant la fixation par soudure avec le revêtement intérieur de l'enceinte blindée.The radio-protective screen in question comprises a wall made of transparent material, the periphery of which is sandwiched in a carrier assembly composed of a fixing frame and a counter-frame, allowing fixing by welding with the internal lining of the shielded enclosure.

La paroi en matériau transparent radio-protecteur est délimitée par une première face, destinée à être orientée du côté de « l'espace froid » extérieur, et par une seconde face destinée à être orientée du côté de « l'espace chaud » intérieur. Une bordure périphérique de cette première face de paroi vient prendre appui contre une face d'appui du contre-cadre par l'intermédiaire d'un joint d'étanchéité en matériau organique (généralement en EPDM ou en néoprène). Et le cadre de fixation est muni de moyens d'appui, avec joint d'étanchéité, contre une bordure périphérique de la seconde face de la paroi en matériau transparent.The wall made of transparent radio-protective material is delimited by a first face, intended to be oriented towards the outside “cold space” side, and by a second face intended to be oriented towards the inside “hot space” side. A peripheral edge of this first wall face bears against a bearing face of the counter-frame by via a seal made of organic material (usually EPDM or neoprene). And the fixing frame is provided with support means, with a seal, against a peripheral edge of the second face of the wall made of transparent material.

Cependant, les joints d'étanchéité interposés entre la paroi en matériau transparent de l'écran radio-protecteur et les contre-cadre et cadre de fixation se dégradent assez rapidement dans le temps, du fait des hautes doses de radiations auxquelles ils sont soumis, et il est nécessaire de les remplacer régulièrement, ce qui, dans le contexte, n'est pas facile à réaliser et est source de coûts importants.However, the seals interposed between the transparent material wall of the radio-protective screen and the counter-frame and fixing frame degrade fairly quickly over time, due to the high doses of radiation to which they are subjected, and it is necessary to replace them regularly, which, in the context, is not easy to achieve and is a source of significant costs.

Présentation de l'inventionPresentation of the invention

Afin de remédier à l'inconvénient précité de l'état de la technique, la présente invention propose un écran radio-protecteur destiné à être fixé sur le pourtour d'une ouverture ménagée dans une paroi séparant un espace soumis à des rayonnements ionisants, dit espace chaud, et un espace non soumis à des rayonnements ionisants, dit espace froid, lequel écran radio-protecteur comprend une paroi en matériau transparent, ladite paroi en matériau transparent comprenant une première face destinée à être orientée du côté dudit espace froid et une seconde face destinée à être orientée du côté dudit espace chaud,

  • une bordure périphérique de l'une desdites première face ou seconde face de ladite paroi en matériau transparent venant prendre appui contre une face d'appui d'un contre-cadre par l'intermédiaire d'un joint d'étanchéité,
  • ledit écran radio-protecteur comprenant un cadre de fixation muni de moyens d'appui contre une bordure périphérique de l'autre desdites première face ou seconde face de ladite paroi en matériau transparent,
  • lesquels moyens d'appui comprennent une structure longitudinale d'appui comprenant une surface de contact avec la bordure périphérique de la première face ou de la seconde face en regard de ladite paroi en matériau transparent,
  • lequel écran radio-protecteur comprend encore des moyens de solidarisation pour solidariser ensemble ledit contre-cadre et ledit cadre de fixation,
  • cet écran radio-protecteur étant caractérisé par le fait que lesdits moyens d'appui comprennent des moyens de rappel élastiques adaptés pour appliquer une pression contre ladite structure longitudinale d'appui en direction de ladite paroi en matériau transparent.
In order to remedy the aforementioned drawback of the state of the art, the present invention proposes a radio-protective screen intended to be fixed on the periphery of an opening made in a wall separating a space subjected to ionizing radiation, called hot space, and a space not subjected to ionizing radiation, called cold space, which radio-protective screen comprises a wall of transparent material, said wall of transparent material comprising a first face intended to be oriented on the side of said cold space and a second face intended to be oriented on the side of said hot space,
  • a peripheral edge of one of said first face or second face of said wall made of transparent material coming to bear against a bearing face of a counter-frame via a seal,
  • said radio-protective screen comprising a fixing frame provided with means for bearing against a peripheral edge of the other of said first face or second face of said wall made of transparent material,
  • which support means comprise a longitudinal support structure comprising a contact surface with the peripheral edge of the first face or of the second face facing said wall of transparent material,
  • which radio-protective screen further comprises fastening means for fastening together said counter-frame and said fixing frame,
  • this radio-protective screen being characterized in that said support means comprise elastic return means suitable for applying pressure against said longitudinal support structure in the direction of said wall made of transparent material.

Une telle particularité permet l'utilisation de joints d'étanchéité résistant bien aux rayonnements ionisants, en particulier des joints en matériau inorganique (avantageusement des joints en métal doux, c'est-à-dire malléable ou ductile, choisi parmi le plomb, le cuivre, l'étain ou le cadmium, à l'état pur ou sous forme d'alliage), ou encore des joints en graphite.Such a particularity allows the use of seals with good resistance to ionizing radiation, in particular seals made of inorganic material (advantageously seals made of soft metal, that is to say malleable or ductile, chosen from lead, copper, tin or cadmium, in the pure state or in the form of an alloy), or graphite gaskets.

D'autres caractéristiques non limitatives et avantageuses de l'écran radio-protecteur conforme à l'invention, prises individuellement ou selon toutes les combinaisons techniquement possibles, sont les suivantes :

  • les moyens de rappel élastiques consistent en une pluralité d'organes ressorts régulièrement ou au moins approximativement régulièrement répartis sur le pourtour dudit cadre de fixation ;
  • lesdits organes ressort consistent en des rondelles Belleville ;
  • la structure longitudinale d'appui comprend un profilé métallique de pression associé à un profil d'appui rapporté constituant ladite surface de contact avec la bordure périphérique de la face en regard de la paroi en matériau transparent et formant joint d'étanchéité ;
  • ledit profil d'appui rapporté est réalisé en un matériau choisi parmi (i) les métaux doux, de préférence le plomb, le cuivre, l'étain et le cadmium, à l'état pur ou sous forme d'alliage, et (ii) le graphite ;
  • au moins certains des moyens de rappel élastiques sont associés à des vis de réglage de pression adaptées pour permettre un réglage de la pression appliquée par lesdits moyens de rappel élastiques sur ladite structure longitudinale d'appui ;
  • certaines au moins desdites rondelles Belleville sont chacune associées à une vis de réglage de pression.
Other non-limiting and advantageous characteristics of the radio-protective screen in accordance with the invention, taken individually or according to all the technically possible combinations, are the following:
  • the elastic return means consist of a plurality of spring members regularly or at least approximately regularly distributed around the periphery of said fixing frame;
  • said spring members consist of Belleville washers;
  • the longitudinal support structure comprises a metal pressure profile associated with an attached support profile constituting said contact surface with the peripheral edge of the face facing the wall made of transparent material and forming a seal;
  • said added support profile is made of a material chosen from (i) soft metals, preferably lead, copper, tin and cadmium, in the pure state or in the form of an alloy, and (ii ) graphite;
  • at least some of the elastic return means are associated with pressure adjustment screws adapted to allow adjustment of the pressure applied by said elastic return means to said longitudinal support structure;
  • at least some of said Belleville washers are each associated with a pressure adjustment screw.

La présente invention concerne encore une cellule blindée cloisonnant un espace soumis à des rayonnements ionisants, comprenant un revêtement intérieur métallique et au moins une fenêtre anti-radiation autorisant un accès visuel de l'extérieur vers l'intérieur de ladite cellule blindée, laquelle fenêtre anti-radiation comprend un fourreau noyé dans une paroi en béton, lequel fourreau reçoit un hublot blindé qui est associé à un écran radio-protecteur tel que défini ci-dessus, fixé sur le pourtour d'une ouverture ménagée dans ledit revêtement intérieur métallique.The present invention also relates to a shielded cell partitioning a space subjected to ionizing radiation, comprising a metallic interior coating and at least one anti-radiation window allowing visual access from the outside to the interior of said shielded cell, which anti-radiation window -radiation comprises a sheath embedded in a concrete wall, which sheath receives a shielded porthole which is associated with a radio-protective screen as defined above, fixed on the periphery of an opening made in said metallic interior coating.

Bien entendu, les différentes caractéristiques, variantes et formes de réalisation de l'invention peuvent être associées les unes avec les autres selon diverses combinaisons dans la mesure où elles ne sont pas incompatibles ou exclusives les unes des autres.Of course, the different characteristics, variants and embodiments of the invention can be associated with each other in various combinations insofar as they are not incompatible or exclusive of each other.

Description détaillée de l'inventionDetailed description of the invention

De plus, diverses autres caractéristiques de l'invention ressortent de la description annexée effectuée en référence aux dessins qui illustrent des formes, non limitatives, de réalisation de l'invention et où :

  • [Fig. 1] est une vue schématique en coupe verticale qui illustre une cellule blindée intégrant une fenêtre anti-radiation équipée, côté espace chaud, d'un écran radio-protecteur conforme à l'invention ;
  • [Fig. 2] montre l'écran radio-protecteur de la fenêtre anti-radiation illustrée sur la figure 1, vu de face du côté de l'espace chaud de la cellule blindée ;
  • [Fig. 3] est une vue en coupe selon le plan de coupe 3-3 de la figure 2 ;
In addition, various other characteristics of the invention emerge from the appended description made with reference to the drawings which illustrate non-limiting forms of embodiment of the invention and where:
  • [ Fig. 1 ] is a diagrammatic view in vertical section which illustrates a shielded cell integrating an anti-radiation window equipped, on the hot space side, with a radio-protective screen according to the invention;
  • [ Fig. 2 ] shows the radio-protective screen of the anti-radiation window illustrated on the figure 1 , front view from the hot space side of the shielded cell;
  • [ Fig. 3 ] is a sectional view according to section plane 3-3 of the picture 2 ;

La cellule blindée 1 illustrée sur la figure 1 est délimitée par des parois de béton 2 (représentées partiellement) dans l'une desquelles est ménagée une fenêtre anti-radiation 3.The shielded cell 1 illustrated on the figure 1 is delimited by concrete walls 2 (partially shown) in one of which is formed an anti-radiation window 3.

Les parois de béton 2 ont une épaisseur importante qui peut aller jusqu'à 1,5 mètres.The concrete walls 2 have a significant thickness which can be up to 1.5 meters.

La fenêtre anti-radiation 3 est adaptée pour permettre à une personne P située à l'extérieur de la cellule blindée 1, côté espace froid F, de contrôler des opérations réalisées sur des produits radioactifs au sein de l'espace chaud C interne.The anti-radiation window 3 is adapted to allow a person P located outside the shielded cell 1, on the cold space F side, to check operations carried out on radioactive products within the internal hot space C.

Cette fenêtre anti-radiation 3 comprend un fourreau 31 en forme de cadre métallique, par exemple en acier ou en fonte, noyé dans la paroi en béton 2 de la cellule blindée 1, ce fourreau 31 recevant un hublot blindé 32 constitué d'un bloc optique formé ici de deux dalles de verre au plomb 321 et 322.This anti-radiation window 3 comprises a sleeve 31 in the form of a metal frame, for example made of steel or cast iron, embedded in the concrete wall 2 of the shielded cell 1, this sleeve 31 receiving a shielded porthole 32 consisting of a block optic formed here by two slabs of lead glass 321 and 322.

Coté espace chaud C, l'intérieur de la cellule blindée 1 comporte un revêtement métallique 4 dans lequel est ménagée une ouverture 41 en regard de la fenêtre anti-radiation 3, et sur le pourtour de laquelle ouverture 41 est fixée par soudure le pourtour d'un écran radio-protecteur 5, détaillé sur les figures 2 et 3.On the hot space C side, the interior of the shielded cell 1 comprises a metal coating 4 in which is made an opening 41 facing the anti-radiation window 3, and on the periphery of which opening 41 is fixed by welding the periphery of a radio-protective screen 5, detailed on the figure 2 and 3 .

Le revêtement métallique 4, encore appelé « cuvelage », est avantageusement réalisé en inox.The metal coating 4, also called "casing", is advantageously made of stainless steel.

L'écran radio-protecteur 5 comprend une paroi 6 en matériau transparent, délimitée par une première face 61 destinée à être orientée du côté de l'espace froid F de la cellule blindée 1 (c'est-à-dire orientée vers les dalles de verre au plomb 321 et 322), et une seconde face 62 destinée à être orientée du côté de l'espace chaud C.
Ces première et seconde faces 61, 62 de la paroi 6 en matériau transparent sont raccordées par un chant 63.The radio-protective screen 5 comprises a wall 6 of transparent material, delimited by a first face 61 intended to be oriented on the side of the cold space F of the shielded cell 1 (that is to say oriented towards the slabs of lead glass 321 and 322), and a second face 62 intended to be oriented towards the hot space C.
These first and second faces 61, 62 of the wall 6 made of transparent material are connected by an edge 63.

La paroi 6 en matériau transparent peut être réalisée en verre.The wall 6 in transparent material can be made of glass.

Cet écran radio-protecteur 5 comprend encore une structure périphérique 7, formée d'un contre-cadre 8 et d'un cadre de fixation 9, laquelle structure périphérique 7 est adaptée pour tenir la paroi 6 en matériau transparent et pour permettre sa fixation au revêtement métallique 4 de l'enceinte blindée 1.This radio-protective screen 5 further comprises a peripheral structure 7, formed of a counter-frame 8 and of a fixing frame 9, which peripheral structure 7 is adapted to hold the wall 6 made of transparent material and to allow its fixing to the metal covering 4 of shielded enclosure 1.

Pour cela, le pourtour de la paroi 6 en matériau transparent est pris en sandwich entre le contre-cadre 8 et le cadre de fixation 9, et des moyens de solidarisation, ici en forme de vis 10, assurent la solidarisation entre ces contre-cadre 8 et cadre de fixation 9.For this, the periphery of the wall 6 made of transparent material is sandwiched between the counter-frame 8 and the fixing frame 9, and fastening means, here in the form of screws 10, ensure the fastening between these counter-frames 8 and mounting frame 9.

Plus précisément, le pourtour de la paroi 6 en matériau transparent vient se positionner dans une feuillure 81 du contre-cadre 8, avec une bordure périphérique 611 de la première face 61 de cette paroi 6 en matériau transparent qui vient se positionner dans ladite feuillure 81, contre une face d'appui 811 du contre-cadre 8, par l'intermédiaire d'un joint d'étanchéité 11.
D'autre part, le pourtour de la paroi 6 en matériau transparent vient se positionner dans une feuillure 91 du cadre de fixation 9, avec une bordure périphérique 621 de la seconde face 62 de cette paroi 6 en matériau transparent qui vient se positionner dans ladite feuillure 91, en regard de la face 911 d'une aile 912 de cette feuillure 91 ; et le cadre de fixation 9 est muni de moyens 12 d'appui contre ladite bordure périphérique 621 de la seconde face 62 de ladite paroi 6 en matériau transparent.More precisely, the periphery of the wall 6 in transparent material is positioned in a rebate 81 of the counter-frame 8, with a peripheral edge 611 of the first face 61 of this wall 6 in transparent material which is positioned in said rebate 81 , against a bearing surface 811 of the counter-frame 8, via a seal 11.
On the other hand, the periphery of the wall 6 made of transparent material is positioned in a rabbet 91 of the fixing frame 9, with a peripheral edge 621 of the second face 62 of this wall 6 made of transparent material which is positioned in said rebate 91, opposite the face 911 of a wing 912 of this rebate 91; and the fixing frame 9 is provided with means 12 for bearing against said peripheral edge 621 of the second face 62 of said wall 6 made of transparent material.

Ces moyens 12 d'appui comprennent :

  • une structure longitudinale d'appui 121 formée d'un profilé métallique de pression 1211 associé à un profil d'appui 1212 rapporté constituant une surface de contact et un joint d'étanchéité avec la bordure périphérique 621 de la seconde face 62 de la paroi 6 en matériau transparent, et
  • des moyens de rappel élastiques 122 adaptés pour appliquer une pression contre la structure longitudinale d'appui 121 (en direction de la paroi 6 en matériau transparent), ces moyens de rappel élastiques 122 étant associés à des vis de réglage de pression 123.
These support means 12 include:
  • a longitudinal support structure 121 formed of a metal pressure profile 1211 associated with an attached support profile 1212 constituting a contact surface and a seal with the peripheral edge 621 of the second face 62 of the wall 6 in transparent material, and
  • elastic return means 122 adapted to apply pressure against the longitudinal bearing structure 121 (in the direction of the wall 6 of transparent material), these elastic return means 122 being associated with pressure adjustment screws 123.

Le profil d'appui rapporté 1212 est associé au profilé métallique de pression 1211 par collage ou par simple emboitement de formes complémentaires.The added support profile 1212 is associated with the metal pressure profile 1211 by gluing or by simple interlocking of complementary shapes.

Les moyens de rappel élastiques consistent en une pluralité d'organes ressorts en forme de rondelles Belleville 122 régulièrement ou au moins approximativement régulièrement réparties sur le pourtour du cadre de fixation 9, qui sont chacune interposées entre le profilé métallique de pression 1211 et l'extrémité active 1231 des vis de réglage de pression 123.The elastic return means consist of a plurality of spring members in the form of Belleville washers 122 regularly or at least approximately regularly distributed around the periphery of the fixing frame 9, which are each interposed between the metal pressure profile 1211 and the end activates 1231 pressure adjustment screws 123.

Les vis de réglage de pression 123 traversent l'aile 912 de la feuillure 91 du cadre de fixation 9 par l'intermédiaire d'un orifice taraudé 9120. Et l'extrémité 1232 des vis de réglage de pression 123, qui est opposée à celle 1231 coopérant avec la rondelle Belleville 122 associée, est accessible depuis l'extérieur du cadre de fixation 9. Cette extrémité opposée de vis 1232 coopère avec un contre-écrou 124 de blocage et comporte une empreinte 1233 pour sa manœuvre en rotation par un outil approprié (du type clé, tournevis...).The pressure adjustment screws 123 pass through the wing 912 of the rebate 91 of the fixing frame 9 via a threaded hole 9120. And the end 1232 of the pressure adjustment screws 123, which is opposite to that 1231 cooperating with the associated Belleville washer 122, is accessible from outside the fixing frame 9. This opposite end of the screw 1232 cooperates with a lock nut 124 and has a recess 1233 for its rotational operation by an appropriate tool (of the key type, screwdriver, etc.).

On comprend que la manoeuvre en rotation des vis de réglage de pression 123 permet un réglage de la pression appliquée par les moyens de rappel élastiques 122 sur la structure longitudinale d'appui 121, et donc de la pression appliquée par le profil d'appui 1212 sur la paroi 6 en matériau transparent, en direction du contre-cadre 8 et de son joint d'étanchéité 11.It is understood that the rotational operation of the pressure adjustment screws 123 allows adjustment of the pressure applied by the elastic return means 122 on the longitudinal support structure 121, and therefore of the pressure applied by the support profile 1212 on the wall 6 of transparent material, in the direction of the counter-frame 8 and its seal 11.

Le profilé métallique de pression 1211 est par exemple réalisé en acier, acier inoxydable (inox), bronze ou laiton.The metal pressure profile 1211 is for example made of steel, stainless steel (inox), bronze or brass.

De leur côté, les joints d'étanchéité 11 et 1212 peuvent être réalisés en matériau inorganique. Ils peuvent ainsi être réalisés en métal doux (c'est-à-dire malléable/ductile), de préférence choisi parmi le plomb, le cuivre, l'étain ou le cadmium (à l'état pur ou sous forme d'alliages).
Ils peuvent aussi être réalisés en graphite.
De préférence les deux structures de joints 11 et 1212 sont réalisées en un même matériau.For their part, the seals 11 and 1212 can be made of inorganic material. They can thus be made of soft metal (that is to say malleable/ductile), preferably chosen from lead, copper, tin or cadmium (in the pure state or in the form of alloys) .
They can also be made of graphite.
Preferably the two joint structures 11 and 1212 are made of the same material.

Le cadre de fixation 9 et le contre-cadre 8 sont en contact l'un avec l'autre au niveau d'un plan de contact 13 traversé par les vis de solidarisation 10.The fixing frame 9 and the counter-frame 8 are in contact with each other at the level of a contact plane 13 through which the fastening screws 10 pass.

Ces vis de solidarisation 10 sont régulièrement ou au moins approximativement régulièrement réparties sur le pourtour du cadre de fixation 9 et du contre-cadre 8, par exemple selon le même pas que les vis de réglage de pression 123.These fastening screws 10 are regularly or at least approximately regularly distributed over the periphery of the fixing frame 9 and of the counter-frame 8, for example according to the same pitch as the pressure adjustment screws 123.

Sur la figure 3 on remarque la présence d'une structure de calage 14 interposée entre le chant 63 de la paroi 6 en matériau transparent et le côté de la feuillure 81 du contre-cadre 8.On the picture 3 we note the presence of a wedging structure 14 interposed between the edge 63 of the wall 6 in transparent material and the side of the rebate 81 of the counter-frame 8.

Toujours sur la figure 3, on remarque la présence d'une extension latérale 82 du contre-cadre 8, réalisée monobloc, qui est adaptée pour réaliser la fixation par soudage avec la bordure périphérique de l'ouverture 41 réalisée dans le revêtement (ou cuvelage) métallique 4 de la cellule blindée 1.Always on the picture 3 , we note the presence of a lateral extension 82 of the counter-frame 8, made in one piece, which is suitable for carrying out the fixing by welding with the peripheral edge of the opening 41 made in the metal coating (or casing) 4 of the shielded cell 1.

On notera que dans certaines configurations particulières, l'écran radio-protecteur 5 peut être fixé dans l'autre sens sur la bordure périphérique de l'ouverture 41, c'est-à-dire avec le contre-cadre 8 orienté côté espace chaud C et le cadre de fixation 9 orienté côté espace froid F (en particulier pour permettre le démontage du cadre de fixation 9 à partir du côté espace froid F).It will be noted that in certain particular configurations, the radio-protective screen 5 can be fixed in the other direction on the peripheral edge of the opening 41, that is to say with the counter-frame 8 oriented on the hot space side. C and the fixing frame 9 oriented on the cold space F side (in particular to allow the fixing frame 9 to be dismantled from the cold space F side).

Les moyens 12 d'appui selon l'invention permettent d'appliquer une pression permanente sur le joint d'étanchéité 11 pris en sandwich entre la paroi 6 en matériau transparent et la face d'appui 811 de la feuillure 81 du contre-cadre 8, et également sur le joint d'étanchéité 1212 pris en sandwich entre la paroi 6 en matériau transparent et le cadre de fixation 9.The support means 12 according to the invention make it possible to apply a permanent pressure on the seal 11 sandwiched between the wall 6 made of transparent material and the support face 811 of the rebate 81 of the counter-frame 8 , and also on the seal 1212 sandwiched between the wall 6 of transparent material and the fixing frame 9.

Une telle particularité autorise l'utilisation de joints d'étanchéités 11 et 1212 qui résistent bien aux rayonnements ionisants, mais qui, de par leur nature, peuvent avoir tendance à s'écraser ou fluer légèrement dans le temps.Such a feature allows the use of seals 11 and 1212 which resist well to ionizing radiation, but which, by their nature, may tend to crush or creep slightly over time.

Les moyens 12 d'appui constituent alors un système de compensation élastique du fluage par maintien de la pression sur les joints d'étanchéité.The bearing means 12 then constitute an elastic creep compensation system by maintaining the pressure on the seals.

Claims (10)

  1. A radio-protective shield intended to be fastened on the periphery of an opening formed in a wall separating a space subjected to ionising radiations, named hot space (C), and a space not subjected to ionising radiations, named cold space (F), which radio-protective shield (5) comprises a wall (6) made of a transparent material, said wall (6) made of a transparent material comprising a first face (61) intended to be directed on said cold space (F) side, and a second face (62) intended to be directed on said hot space (C) side,
    a peripheral edge (611) of one of said first face (61) or second face (62) of said wall (6) made of a transparent material bearing against a bearing face (811) of a counter-frame (8) through a seal (11),
    said radio-protective shield (5) comprising a fastening frame (9) provided with means (12) for bearing against a peripheral edge (621) of the other one of said first face (61) or second face (62) of said wall (6) made of a transparent material,
    which bearing means (12) comprise a longitudinal bearing structure (121) comprising a contact surface (1212) with the peripheral edge (621) of the first face (61) or of the second face (62) opposite said wall (6) made of a transparent material,
    which radio-protective shield (5) also comprises securing means (10) for securing together said counter-frame (8) and said fastening frame (9),
    characterised in that said bearing means (12) comprise elastic return means (122) adapted to apply a pressure against said longitudinal bearing structure (121) in the direction of said wall (6) made of a transparent material.
  2. The radio-protective shield according to claim 1, characterised in that said seal (11) is made of a soft metal, preferably selected from lead, copper, tin or cadmium, in the pure state or in an alloyed form.
  3. The radio-protective shield according to claim 1, characterised in that said seal (11) is made of graphite.
  4. The radio-protective shield according to any one of claims 1 to 3, characterised in that said elastic return means (122) consist of a plurality of spring members (122) evenly, or at least almost evenly, distributed over the periphery of said fastening frame (9).
  5. The radio-protective shield according to claim 4, characterised in that said spring members consist of Belleville washers (122).
  6. The radio-protective shield according to any one of claims 1 to 3, characterised in that said longitudinal bearing structure (121) comprises a pressure metallic profile (1211) associated to an affixed bearing profile (1212) forming said surface of contact with the peripheral edge (621) of the face (62) opposite the wall (6) made of a transparent material and forming a seal.
  7. The radio-protective shield according to claim 6, characterised in that said affixed bearing profile (1212) is made of a materia! selected from - soft metals, preferably lead, copper, tin and cadmium, in the pure state or in an alloyed form, and - graphite.
  8. The radio-protective shield according to any one of claims 1 to 7, characterised in that at least some of said elastic return means (122) are associated to pressure setting screws (123) adapted to enable setting of the pressure applied by said elastic return means (122) on said longitudinal bearing structure (121).
  9. The radio-protective shield according to claims 5 and 8 in combination, characterised in that each of at least some of said Belleville washers (122) is associated to a pressure setting screw (123).
  10. A shielded cell enclosing a space subjected to ionising radiations, comprising a metallic internal coating (4) and at least one anti-radiation window (3) enabling visual access from the outside to the inside of said shielded cell (1), which anti-radiation window (3) comprises a sheath (31) embedded in a concrete wall (2), which sheath (31) receives a shielded porthole (32) which is associated to a radio-protective shield (5) according to any one of claims 1 to 9, fastened on the periphery of an opening (41) formed in said metallic internal coating (4).
EP20709643.9A 2019-02-05 2020-02-04 Radio-protective shield Active EP3921853B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1901123A FR3092431B1 (en) 2019-02-05 2019-02-05 Radiation protection screen
PCT/FR2020/050184 WO2020161432A1 (en) 2019-02-05 2020-02-04 Radio-protective shield

Publications (2)

Publication Number Publication Date
EP3921853A1 EP3921853A1 (en) 2021-12-15
EP3921853B1 true EP3921853B1 (en) 2022-11-23

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EP20709643.9A Active EP3921853B1 (en) 2019-02-05 2020-02-04 Radio-protective shield

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US (1) US11488738B2 (en)
EP (1) EP3921853B1 (en)
JP (1) JP7416812B2 (en)
KR (1) KR20220030919A (en)
CA (1) CA3128446A1 (en)
FR (1) FR3092431B1 (en)
WO (1) WO2020161432A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114424299A (en) * 2019-10-14 2022-04-29 法国圣戈班玻璃厂 Sealed shell with window
US20220304635A1 (en) * 2021-02-26 2022-09-29 Leo Cancer Care, Inc. Radiation protection

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0430687B1 (en) * 1989-12-01 1995-02-08 Doryokuro Kakunenryo Kaihatsu Jigyodan Radiation shielding structure

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1333746A (en) * 1962-03-20 1963-08-02 Saint Gobain Nucleaire Improvements to observation windows for radioactive speakers
US3505525A (en) * 1966-01-25 1970-04-07 Corning Glass Works Radiation-shielding window containing silicone oils between facing sheets
US7257927B2 (en) * 2003-08-15 2007-08-21 Premier Technology, Inc. Three-piece frame assembly for window of enclosure
FR3060191B1 (en) * 2016-12-14 2020-06-12 Lemer Protection Anti-X Par Abreviation Societe Lemer Pax MOBILE RADIATION PROTECTION SCREEN

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0430687B1 (en) * 1989-12-01 1995-02-08 Doryokuro Kakunenryo Kaihatsu Jigyodan Radiation shielding structure

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KR20220030919A (en) 2022-03-11
US20220130565A1 (en) 2022-04-28
FR3092431A1 (en) 2020-08-07
US11488738B2 (en) 2022-11-01
JP7416812B2 (en) 2024-01-17
FR3092431B1 (en) 2021-01-29
WO2020161432A1 (en) 2020-08-13
CA3128446A1 (en) 2020-02-04
JP2022521151A (en) 2022-04-06
EP3921853A1 (en) 2021-12-15

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