EP3921853B1 - Strahlenschutzschild - Google Patents

Strahlenschutzschild 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
European Patent Office
Prior art keywords
radio
face
protective shield
wall
transparent material
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.)
Active
Application number
EP20709643.9A
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English (en)
French (fr)
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EP3921853A1 (de
Inventor
Pierre-Marie Lemer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lemer Pax
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Lemer Pax
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Publication date
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Publication of EP3921853A1 publication Critical patent/EP3921853A1/de
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Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • 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.

Landscapes

  • 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)
  • Building Environments (AREA)
  • Securing Of Glass Panes Or The Like (AREA)
  • Gasket Seals (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Claims (10)

  1. Strahlenschutzschild, der dazu bestimmt ist, am Umfang einer Öffnung angebracht zu werden, die in einer Wand ausgeführt ist, die einen ionisierenden Strahlungen ausgesetzten Raum, einen sogenannten heißen Raum (C), von einem keinen ionisierenden Strahlungen ausgesetzten Raum, einem sogenannten kalten Raum (F), trennt, wobei der Strahlenschutzschild (5) eine Wand (6) aus transparentem Material aufweist, wobei die Wand (6) aus transparentem Material eine erste Seite (61), die dazu bestimmt ist, zum kalten Raum (F) hin gerichtet zu werden, und eine zweite Seite (62), die dazu bestimmt ist, zum heißen Raum (C) hin gerichtet zu werden, aufweist,
    wobei ein umlaufender Rand (611) der ersten Seite (61) oder der zweiten Seite (62) der Wand (6) aus transparentem Material mittels einer Dichtung (11) an einer Andruckseite (811) eines Gegenrahmens (8) anliegt,
    wobei der Strahlenschutzschild (5) einen Befestigungsrahmen (9) aufweist, der mit Mitteln (12) zum Andrücken an einen umlaufenden Rand (621) der anderen Seite, das heißt, der zweiten Seite (62) oder der ersten Seite (61), der Wand (6) aus durchsichtigem Material ausgestattet ist,
    wobei die Andruckmittel (12) eine längliche Andruckstruktur (121) mit einer Oberfläche (1212) für den Kontakt mit dem umlaufenden Rand (621) der der Wand (6) aus durchsichtigem Material gegenüberliegenden ersten Seite (61) oder zweiten Seite (62) aufweisen,
    wobei der Schutzschild (5) außerdem Befestigungsmittel (10) zum festen Verbinden des Gegenrahmens (8) mit dem Befestigungsrahmen (9) aufweist,
    dadurch gekennzeichnet, daß die Andruckmittel (12) elastische Rückstellmittel (122) aufweisen, die dazu ausgelegt sind, auf die längliche Andruckstruktur (121) einen Druck zur Wand (6) aus durchsichtigem Material hin auszuüben.
  2. Strahlenschutzschild gemäß Anspruch 1, dadurch gekennzeichnet, daß die Dichtung (11) aus einem weichen Material gefertigt ist, das vorzugsweise aus Blei, Kupfer, Zinn oder Kadmium, in reinem Zustand oder als Legierung, ausgewählt ist.
  3. Strahlenschutzschild gemäß Anspruch 1, dadurch gekennzeichnet, daß die Dichtung (11) aus Graphit gefertigt ist.
  4. Strahlenschutzschild gemäß einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die elastischen Rückstellmittel (122) aus einer Anzahl Federorganen (122) bestehen, die gleichmäßig oder mindestens annähernd gleichmäßig über den Umfang des Befestigungsrahmens (9) verteilt sind.
  5. Strahlenschutzschild gemäß Anspruch 4, dadurch gekennzeichnet, daß die Federorgane aus Tellerfedern (122) bestehen.
  6. Strahlenschutzschild gemäß einem der Ansprüche 1 bis: 3, dadurch gekennzeichnet, daß die längliche Andruckstruktur (121) ein metallenes Druckprofil (1211) aufweist, das einem angesetzten Andruckprofil (1212) zugeordnet ist, das die Oberfläche für den Kontakt mit dem umlaufenden Rand (621) der der Wand (6) aus durchsichtigem Material gegenüberliegenden Seite (62) bildet und eine Dichtung bildet.
  7. Strahlenschutzschild gemäß Anspruch 6, dadurch gekennzeichnet, daß das angesetzte Andruckprofil (1212) aus einem Material gefertigt ist, das aus - den weichen Metallen, vorzugsweise Blei, Kupfer, Zinn oder Kadmium, in reinem Zustand oder als Legierung, und - Graphit ausgewählt ist.
  8. Strahlenschutzschild gemäß einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß mindestens einige der elastischen Andruckmittel (122) Druckeinstellschrauben (123) zugeordnet sind, die dazu ausgelegt sind, ein Einstellen des durch die elastischen Andruckmittel (122) ausgeübten Drucks auf die längliche Andruckstruktur (121) zu ermöglichen.
  9. Strahlenschutzschild gemäß den Ansprüchen 5 und 8 zusammengenommen, dadurch gekennzeichnet, daß mindestens einige der Tellerfedern (122) jeweils einer Druckeinstellschraube (123) zugeordnet sind.
  10. Abgeschirmte Zelle, die einen ionisierenden Strahlungen ausgesetzten Raum abteilt, mit einer inneren Metallbeschichtung (4) und mindestens einem strahlungsabschirmenden Fenster (3), das einen Einblick in das Innere der abgeschirmten Zelle (1) ermöglicht, wobei das strahlungsabschirmende Fenster (3) einen in eine Betonwand (2) eingelassene Mantelrahmen (31) aufweist, wobei der Mantelrahmen (31) ein strahlungsabschirmendes Sichtfenster (32) aufnimmt, das einem Strahlenschutzschild (5) gemäß einem der Ansprüche 1 bis 9 zugeordnet ist, der am Umfang einer in der inneren Metallbeschichtung (4) ausgebildeten Öffnung (41) befestigt ist.
EP20709643.9A 2019-02-05 2020-02-04 Strahlenschutzschild Active EP3921853B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1901123A FR3092431B1 (fr) 2019-02-05 2019-02-05 Ecran radio-protecteur
PCT/FR2020/050184 WO2020161432A1 (fr) 2019-02-05 2020-02-04 Ecran radio-protecteur

Publications (2)

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

Family

ID=67441238

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20709643.9A Active EP3921853B1 (de) 2019-02-05 2020-02-04 Strahlenschutzschild

Country Status (7)

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

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114424299A (zh) * 2019-10-14 2022-04-29 法国圣戈班玻璃厂 带窗口的封存壳
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 (de) * 1989-12-01 1995-02-08 Doryokuro Kakunenryo Kaihatsu Jigyodan Strahlenschutzaufbau

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1333746A (fr) * 1962-03-20 1963-08-02 Saint Gobain Nucleaire Perfectionnements aux fenêtres d'observation pour enceintes radio-actives
US3505525A (en) * 1966-01-25 1970-04-07 Corning Glass Works Radiation-shielding window containing silicone oils between facing sheets
JPH02154198A (ja) * 1988-12-06 1990-06-13 Power Reactor & Nuclear Fuel Dev Corp グローブボックスの窓枠用ガスケット
GB2237816A (en) * 1989-11-09 1991-05-15 Cambridge Isolation Tech Isolator transfer containers
JP2607999B2 (ja) * 1991-12-04 1997-05-07 三井造船株式会社 グローブボックスの透明パネル交換方法
JPH07159594A (ja) * 1993-12-07 1995-06-23 Power Reactor & Nuclear Fuel Dev Corp 放射性物質取扱施設用シール構造
JP2687308B2 (ja) * 1994-08-22 1997-12-08 千代田メインテナンス株式会社 作業用グローブボックス
US7257927B2 (en) * 2003-08-15 2007-08-21 Premier Technology, Inc. Three-piece frame assembly for window of enclosure
FR3060191B1 (fr) * 2016-12-14 2020-06-12 Lemer Protection Anti-X Par Abreviation Societe Lemer Pax Paravent de radioprotection mobile

Patent Citations (1)

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

Also Published As

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

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