EP0129782B1 - Device for handling and protecting containers for radioactive materials - Google Patents

Device for handling and protecting containers for radioactive materials Download PDF

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Publication number
EP0129782B1
EP0129782B1 EP84106786A EP84106786A EP0129782B1 EP 0129782 B1 EP0129782 B1 EP 0129782B1 EP 84106786 A EP84106786 A EP 84106786A EP 84106786 A EP84106786 A EP 84106786A EP 0129782 B1 EP0129782 B1 EP 0129782B1
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EP
European Patent Office
Prior art keywords
pot
protective pot
cover
edge protective
storage
Prior art date
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Expired
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EP84106786A
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German (de)
French (fr)
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EP0129782A1 (en
Inventor
Werner Dipl.-Ing. Botzem
Heinrich Dipl.-Ing. Quillmann
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Deutsche Gesellschaft fuer Wiederaufarbeitung von Kernbrennstoffen mbH
Nukem GmbH
Original Assignee
Deutsche Gesellschaft fuer Wiederaufarbeitung von Kernbrennstoffen mbH
Nukem GmbH
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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
    • G21F5/00—Transportable or portable shielded containers
    • G21F5/06—Details of, or accessories to, the containers
    • G21F5/14—Devices for handling containers or shipping-casks, e.g. transporting devices loading and unloading, filling of containers
    • 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
    • G21F5/00—Transportable or portable shielded containers
    • G21F5/06—Details of, or accessories to, the containers
    • G21F5/08—Shock-absorbers, e.g. impact buffers for containers

Definitions

  • the invention relates to a device for handling and protecting a storage container for radioactive materials provided with a shock-sensitive corrosion protection cover, in particular a shock-sensitive final storage container closed with a lid, during final storage in boreholes of geological formations.
  • Radioactive substances e.g. Radioactive waste generated during the reprocessing of nuclear fuel elements is first stored temporarily after conditioning and then stored in suitable geological formations opposite the biosphere.
  • the radioactive substances are packed in round or square storage containers, for example in closed containers or in monolithic pressed bodies in which the radioactive substances are embedded.
  • the storage containers must withstand long-term corrosion. Therefore, metallic containers are often provided with a corrosion protection layer made of a non-metallic material, e.g. Ceramics. Some of the containers consist entirely or predominantly of ceramic material, such as aluminum oxide.
  • monolithic graphite compacts are also intended for final storage.
  • the corrosion protection layer coatings used are very sensitive to impact and must be protected against damage during handling and against mechanical effects during storage. This applies especially to the particularly endangered edge areas of the storage containers.
  • damage during handling during transport and during introduction into the final deposit e.g.
  • damage to the corrosion protection layer cannot be ruled out in the first years of final storage, as certain mountain influences in the storage area are possible, especially in the early days after the installation of final repositories, before these come to rest later.
  • the present invention was therefore based on the object of providing a device for handling and protecting a storage container for radioactive substances provided with a shock-sensitive corrosion protection sheath, in particular a shock-sensitive final storage container closed with a lid, during final storage in boreholes of geological formations, which particularly effectively protects shock-sensitive edge areas, is easy to use, optimally utilizes the available storage capacity, is easy to manufacture, saves weight and is cheap.
  • This object has been achieved according to the invention in that it consists of a bottom edge protection pot surrounding the edges in the lower region of the storage container and a cover edge protection pot surrounding the edges in the upper region of the storage unit, and in that the bottom edge protection is releasably connected to a lifting plate provided with supporting devices for a lifting device by lifting rods is, the lifting rods have remote-controlled devices for locking and releasing the lifting rods.
  • the height of the protective wall of the cover edge protection pot is preferably greater than the thickness of the cover of the repository container. This additionally protects the sealing zone between the container body and the lid.
  • the lifting rods are carried out in recesses or bores which are located axially in the protective wall of the cover edge protection pot and are screwed into the protective wall of the base edge protection pot. In this way, the diameter of the device according to the invention can be reduced, the storage volume can be better used and the borehole can be dimensioned smaller.
  • the bottom edge protection pot and / or the top edge protection pot have energy-absorbing elements in the form of shock absorbers.
  • the bottom edge protection pot and the top edge protection pot have a circumferential fillet on the inside at the apex of the angle formed between the respective protective wall and the respective bottom.
  • the round or square storage containers (1) are provided with a shock-sensitive corrosion protection cover (16). They are designed as containers with lids (11) or as graphite blocks, contain radioactive substances (19) and in many cases have a weight of approx. 10-12 tons.
  • the upper area of the storage container (1) is surrounded by a cover edge protection pot (3), this designation this also applies to containers that do not have an actual lid, but are made of pressed material on all sides.
  • the lower area is surrounded by a bottom edge protection pot (2).
  • Lid edge protection pot (3) and bottom edge protection pot (2) can be made of cheap metallic material. Both can be put on the container (1), inserted or directly attached to the storage container (1), for example glued.
  • Bottom edge protection pot (2) and lid edge protection pot (3) are detachably connected to one another via a lifting plate (4) by means of metallic lifting bars (5).
  • the diameter of the lifting bars can be approx. 2 cm.
  • the number of lifting rods (5) depends on the geometry of the storage container (1). In the case of a storage container with a cylindrical geometry, it is advisable to use 3 lifting rods.
  • the lifting rods (5) have an angled section (14) on the foot side, which are latched into recesses (13) in the bottom edge protection pot (2) when handling the storage container (1).
  • the upper part of the lifting rods (5) is rotatably guided through bores (6) which are located in the lifting plate (4) and has elements (7), for example levers, which can be remotely controlled on the head side.
  • the lifting plate (4) is equipped with carrying devices (8), for example with an eyelet for a crane hook or with a gripping mushroom.
  • carrying devices (8) for example with an eyelet for a crane hook or with a gripping mushroom.
  • the lifting rods (5) are released from the recesses (13) by rotating the elements (7) so that the lifting plate (4) with the lifting rods (5) for the next storage container, Repository containers or press blocks can be used while the edge protection pots (2, 3) remain on the stored container (1) and ensure the protection of the particularly sensitive edges even after handling mountain movements.
  • the height of the protective walls (9, 10) of the edge protection pots (2, 3) is selected so that the peripheral regions of the storage container (1), which are also exposed to the rock mechanics, are also protected.
  • the height of the protective wall (9) of the cover edge protection pot (3) is greater than the thickness of the cover (11) in the event that the storage container (1) is a final storage container closed with a cover. As a result, the seal between the container lid (11) and the container body (20) is covered and thus protected. Since usually several storage containers (1) are placed directly on top of one another, it is advantageous if the bottom edge protection pot (2) and / or the top edge protection pot (3) carry energy-consuming elements in the form of shock absorbers (18), for example a honeycomb structure, spring elements or insulating material. This means that even if the storage container is occasionally placed inattentively and hard, a load on the sensitive corrosion protection coating or the graphite matrix of a corresponding pressed storage container can be avoided.
  • shock absorbers (18) for example a honeycomb structure, spring elements or insulating material.
  • edge protection pots (2, 3) In contrast to large-volume transport dampers for transport containers, often weighing over 100 tons, which are designed for large drop heights in the event of an accident, only a slight damping effect is sufficient in the present case, which increases the thickness of the edge protection pots (2, 3) only slightly.
  • the thickness of the edge protection pots (2, 3) per se is normally only 2-5 cm.
  • the lifting rods (5) are carried out in recesses or bores (12) which are located axially in the protective wall (9) of the lid edge protection pot (3) and in the protective wall (10) of the bottom edge protection pot (2) in corresponding threaded holes (15) are screwed in. Since the diameter of the lifting plate (4) can also be reduced in this case, there is the possibility of making the borehole - or in other cases the stack geometry - smaller.
  • the bottom edge protection pot (2) and the top edge protection pot (3) have a circumferential groove (17) on the inside at the apex of the angle formed between the respective protective wall (9, 10) and the respective base.
  • the angle is usually around 90 °, but it can also be slightly larger, i.e. the shape of the edge protector is slightly conical on the inside.
  • the device according to the invention not only represents effective protection of the shock-sensitive corrosion protection material of the storage containers against mechanical damage such as cracks, spalling and breakouts, but is also simple and safe to use. This is of great advantage because of the radioactive content of the storage containers.
  • the device is also easy to manufacture.
  • the edge protection pots can be made of cheap material.
  • the lifting rods (5) are held securely in the bottom edge protection pot (2), although other types of engagement are also possible.
  • the storage capacity in the caverns or boreholes of the rock or salt formations is optimally used, the storage container itself can be designed to save weight, provided that appropriate radiation protection measures are taken during transport and the storage process.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Stackable Containers (AREA)
  • Processing Of Solid Wastes (AREA)
  • Auxiliary Methods And Devices For Loading And Unloading (AREA)
  • Closures For Containers (AREA)
  • Pressure Vessels And Lids Thereof (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Description

Gegenstand der Erfindung ist eine Vorrichtung zur Handhabung und zum Schutz eines mit einer stossempfindlichen Korrosionsschutzhülle versehenen Lagergebindes für radioaktive Stoffe, insbesondere eines mit einem Deckel verschlossenen stossempfindlichen Endlagerbehälters, bei der Endlagerung in Bohrlöchern von geologischen Formationen.The invention relates to a device for handling and protecting a storage container for radioactive materials provided with a shock-sensitive corrosion protection cover, in particular a shock-sensitive final storage container closed with a lid, during final storage in boreholes of geological formations.

Radioaktive Stoffe, z.B. bei der Wiederaufarbeitung von Kernbrennelementen anfallende radioaktive Abfälle, werden nach dem Konditionieren zunächst zwischengelagert und anschliessend unter Abschluss gegenüber der Biosphäre in geeigneten geologischen Formationen gelagert. Dabei sind die radioaktiven Stoffe in runde oder eckige Lagergebinde, beispielsweise in verschlossenen Behältern oder in monolitischen Presskörpern, in die die radioaktiven Stoffe eingebettet sind, verpackt. Die Lagergebinde müssen einer Langzeitkorrosion widerstehen. Daher sind metallische Behälter oft mit einer Korrosionsschutzschicht aus einem nichtmetallischen Werkstoff versehen, z.B. Keramik. Zum Teil bestehen die Behälter vollständig oder überwiegend aus keramischem Material, wie Aluminiumoxid. Daneben sind auch monolitische Presskörper aus Grafit für die Endlagerung vorgesehen. Die verwendeten Korrosionsschutzschicht-Überzüge, vor allem jedoch das nichtmetallische Korrosionsschutzmaterial, sind sehr stossempfindlich und müssen gegenüber Beschädigungen bei der Handhabung und gegenüber gebirgsmechanischen Einwirkungen bei der Lagerung gesichert werden. Das gilt vor allem für die besonders gefährdeten Kantenbereiche der Lagergebinde. Neben möglichen Beschädigungen bei der Handhabung während des Transportes und während der Einbringung in die Endlagerstätte, z.B. bei der Einbringung in Bohrlöcher von Salzformationen, können weiterhin Beschädigungen der Korrosionsschutzschicht in den ersten Jahren der Endlagerung nicht ausgeschlossen werden, da insbesondere in der Anfangszeit nach der Einrichtung von Endlagern gewisse Gebirgseinflüsse im Lagerbereich möglich sind, ehe diese später zur Ruhe kommen.Radioactive substances, e.g. Radioactive waste generated during the reprocessing of nuclear fuel elements is first stored temporarily after conditioning and then stored in suitable geological formations opposite the biosphere. The radioactive substances are packed in round or square storage containers, for example in closed containers or in monolithic pressed bodies in which the radioactive substances are embedded. The storage containers must withstand long-term corrosion. Therefore, metallic containers are often provided with a corrosion protection layer made of a non-metallic material, e.g. Ceramics. Some of the containers consist entirely or predominantly of ceramic material, such as aluminum oxide. In addition, monolithic graphite compacts are also intended for final storage. The corrosion protection layer coatings used, but above all the non-metallic corrosion protection material, are very sensitive to impact and must be protected against damage during handling and against mechanical effects during storage. This applies especially to the particularly endangered edge areas of the storage containers. In addition to possible damage during handling during transport and during introduction into the final deposit, e.g. When drilling salt formations into boreholes, damage to the corrosion protection layer cannot be ruled out in the first years of final storage, as certain mountain influences in the storage area are possible, especially in the early days after the installation of final repositories, before these come to rest later.

Es wurden daher schon Überlegungen angestellt, Behälter mit nichtmetallischen Korrosionsschutz- überzügen und nichtmetallische Presskörper zusätzlich in metallische Überbehälter einzusetzen, die ihrerseits Tragzapfen bzw. andere Einrichtungen zum Handhaben mittels Hebezeug oder Manipulator aufweisen. Derartige Schutzeinrichtungen haben jedoch den Nachteil, dass über sie eventuell auftretende Schubkräfte auf die darunterliegende Korrosionsschutzschicht kleinflächig weitergeleitet werden, es sei denn, die Wanddicke des metallischen Überbehälters ist sehr reichlich dimensioniert. Sie erhöhen dann aber das Gewicht des ohnehin bereits mehrere Tonnen schweren Lagergebindes, erschweren die Handhabung, begrenzen die Lagerkapazität und verteuern sowohl das Gebinde als auch die Einlagerung selbst ganz erheblich.Therefore, considerations have already been made to additionally insert containers with non-metallic corrosion protection coatings and non-metallic pressed bodies in metallic over-containers, which in turn have trunnions or other devices for handling by means of a lifting device or manipulator. Protective devices of this type have the disadvantage, however, that small thrust forces that may occur are passed on to the underlying corrosion protection layer, unless the wall thickness of the metallic container is very large. However, they then increase the weight of the storage container, which is already several tons heavy, make handling more difficult, limit the storage capacity and make both the container and the storage itself considerably more expensive.

Der vorliegenden Erfindung lag daher die Aufgabe zugrunde, eine Vorrichtung zur Handhabung und zum Schutz eines mit einer stossempfindlichen Korrosionsschutzhülle versehenen Lagergebindes für radioaktive Stoffe, insbesondere eines mit einem Deckel verschlossenen stossempfindlichen Endlagerbehälters, bei der Endlagerung in Bohrlöchern von geologischen Formationen zu schaffen, die die besonders stossempfindlichen Kantenbereiche wirksam schützt, einfach zu handhaben ist, die vorhandene Lagerkapazität optimal ausnutzt, einfach herstellbar, gewichtssparend und billig ist.The present invention was therefore based on the object of providing a device for handling and protecting a storage container for radioactive substances provided with a shock-sensitive corrosion protection sheath, in particular a shock-sensitive final storage container closed with a lid, during final storage in boreholes of geological formations, which particularly effectively protects shock-sensitive edge areas, is easy to use, optimally utilizes the available storage capacity, is easy to manufacture, saves weight and is cheap.

Diese Aufgabe wurde erfindungsgemäss dadurch gelöst, dass sie aus einem die Kanten im unteren Bereich des Lagergebindes umgebenden Bodenkantenschutztopf und einem die Kanten im oberen Bereich des Lagergebindes umgebenden Deckelkantenschutztopf besteht, und dass der Bodenkantenschutz mit einer mit Trageinrichtungen für ein Hebezeug versehenen Hebeplatte durch Hebestäbe lösbar verbunden ist, wobei die Hebestäbe kopfseitig fernbedienbare Einrichtungen zum Arretieren und Lösen der Hebestäbe aufweisen.This object has been achieved according to the invention in that it consists of a bottom edge protection pot surrounding the edges in the lower region of the storage container and a cover edge protection pot surrounding the edges in the upper region of the storage unit, and in that the bottom edge protection is releasably connected to a lifting plate provided with supporting devices for a lifting device by lifting rods is, the lifting rods have remote-controlled devices for locking and releasing the lifting rods.

Vorzugsweise ist bei der Verwendung von Endlagerbehältern die Höhe der Schutzwand des Deckelkantenschutztopfes grösser als die Dicke des Deckels des Endlagerbehälters. Dadurch wird die Abdichtungszone zwischen Behälterkörper und Deckel zusätzlich geschützt.When using repository containers, the height of the protective wall of the cover edge protection pot is preferably greater than the thickness of the cover of the repository container. This additionally protects the sealing zone between the container body and the lid.

Als vorteilhaft hat sich auch herausgestellt, wenn die Hebestäbe in Aussparungen oder Bohrungen, die sich axial in der Schutzwand des Deckelkantenschutztopfes befinden, durchgeführt und in die Schutzwand des Bodenkantenschutztopfes eingeschraubt sind. Auf diese Weise kann der Durchmesser der erfindungsgemässen Vorrichtung reduziert, das Lagervolumen besser genutzt und das Bohrloch kleiner dimensioniert werden.It has also proven to be advantageous if the lifting rods are carried out in recesses or bores which are located axially in the protective wall of the cover edge protection pot and are screwed into the protective wall of the base edge protection pot. In this way, the diameter of the device according to the invention can be reduced, the storage volume can be better used and the borehole can be dimensioned smaller.

Ferner ist es von Vorteil, wenn der Bodenkantenschutztopf und/oder der Deckelkantenschutztopf einergieverzehrende Elemente in Form von Stossdämpfern aufweisen. Dadurch hat ein gegebenenfalls hartes Aufsetzen eines Lagergebindes auf ein anderes Lagergebinde in einer Kaverne oder in einem Bohrloch auch bei sehr unachtsamer Handhabung keine nachteiligen Folgen.Furthermore, it is advantageous if the bottom edge protection pot and / or the top edge protection pot have energy-absorbing elements in the form of shock absorbers. As a result, a possibly hard placement of a storage container on another storage container in a cavern or in a borehole has no disadvantageous consequences, even when handled very carelessly.

Zum zusätzlichen Schutz der Kanten der Lagergebinde ist es weiterhin von Vorteil, wenn der Bodenkantenschutztopf und der Deckelkantenschutztopf innenseitig im Scheitel des zwischen der jeweiligen Schutzwand und des jeweiligen Bodens gebildeten Winkels eine umlaufende Hohlkehle aufweisen.For additional protection of the edges of the storage containers, it is also advantageous if the bottom edge protection pot and the top edge protection pot have a circumferential fillet on the inside at the apex of the angle formed between the respective protective wall and the respective bottom.

Die erfindungsgemässe Vorrichtung wird anhand der schematischen Figuren 1 bis 3 beispielhaft näher erläutert. Es stellen dar

  • Fig. 1 eine erfindungsgemässe Vorrichtung im Längsschnitt,
  • Fig. 2 eine besondere Ausgestaltung der Vorrichtung im Längsschnitt,
  • Fig. 3 besondere Ausgestaltungen des Deckelkantenschutztopfes im Längsschnitt.
The device according to the invention is explained in more detail by way of example with reference to the schematic FIGS. 1 to 3. It represent
  • 1 shows a device according to the invention in longitudinal section,
  • 2 shows a special embodiment of the device in longitudinal section,
  • Fig. 3 special embodiments of the lid edge protection pot in longitudinal section.

Die runden oder eckigen Lagergebinde (1) sind mit einer stossempfindlichen Korrosionsschutzhülle (16) versehen. Sie sind als Behälter mit Deckel (11) oder als Grafitblöcke ausgebildet, enthalten radioaktive Stoffe (19) und haben in vielen Fällen ein Gewicht von ca. 10-12 Tonnen. Der obere Bereich des Lagergebindes (1) ist mit einem Deckelkantenschutztopf (3) umgeben, wobei diese Bezeichnung auch für Gebinde gilt, die keinen eigentlichen Deckel besitzen, sondern allseitig aus gepresstem Material bestehen. Der untere Bereich ist mit einem Bodenkantenschutztopf (2) umgeben. Deckelkantenschutztopf (3) und Bodenkantenschutztopf (2) können aus billigem metallischem Material gefertigt sein. Beide können auf das Gebinde (1) gestülpt, gesteckt oder auch am Lagergebinde (1) direkt befestigt, beispielsweise geklebt, sein. Bodenkantenschutztopf (2) und Deckelkantenschutztopf (3) sind über eine Hebeplatte (4) durch metallische Hebestäbe (5) lösbar miteinander verbunden. Der Durchmesser der Hebestäbe kann ca. 2 cm betragen. Die Anzahl der Hebestäbe (5) ist abhängig von der Geometrie des Lagergebindes (1). Bei einem Lagergebinde mit zylinderförmiger Geometrie ist die Verwendung von 3 Hebestäben zweckmässig. Die Hebestäbe (5) weisen fussseitig eine Abwinkelung (14) auf, die beim Hantieren des Lagergebindes (1) in Aussparungen (13) im Bodenkantenschutztopf (2) eingeklinkt sind. Der obere Teil der Hebestäbe (5) ist durch Bohrungen (6), die sich in der Hebeplatte (4) befinden, drehbar geführt und weist kopfseitig fernbedienbare Elemente (7), z.B. Hebel, auf. Die Hebeplatte (4) ist mit Trageinrichtungen (8), beispielsweise mit einer Öse für einen Kranhaken oder mit einem Greifpilz, ausgestattet. Nach dem Herablassen des Lagergebindes (1) in das Bohrloch werden die Hebestäbe (5) durch Drehen der Elemente (7) aus den Aussparungen (13) ausgeklinkt, so dass die Hebeplatte (4) mit den Hebestäben (5) für die nächsten Lagergebinde, Endlagerbehälter oder Pressblöcke verwendet werden können, während die Kantenschutztöpfe (2, 3) am eingelagerten Gebinde (1) verbleiben und den Schutz der besonders empfindlichen Kanten auch nach dem Hantieren bei Gebirgsbewegungen sicherstellen. Die Höhe der Schutzwände (9, 10) der Kantenschutztöpfe (2, 3) ist so gewählt, dass die gegenüber der Gebirgsmechanik ebenfalls exponierten kantennahen Umfangsbereiche des Lagergebindes (1) mit geschützt sind. Dabei ist es von besonderem Vorteil, wenn die Höhe der Schutzwand (9) des Deckelkantenschutztopfes (3) grösser ist als die Dicke des Deckels (11) für den Fall, dass das Lagergebinde (1) ein mit einem Deckel verschlossener Endlagerbehälter ist. Dadurch wird die Abdichtung zwischen Behälterdeckel (11) und Behältergrundkörper (20) überdeckt und somit geschützt. Da meist mehrere Lagergebinde (1) direkt aufeinander gestellt werden, ist es von Vorteil, wenn der Bodenkantenschutztopf (2) und/oder der Deckelkantenschutztopf (3) energieverzehrende Elemente in Form von Stossdämpfern (18) tragen, beispielsweise eine Wabenstruktur, Federelemente oder Dämmaterial. Damit kann auch bei gelegentlichem unachtsamen harten Aufsetzen eines Lagergebindes eine Belastung des empfindlichen Korrosionsschutzüberzuges bzw. der Grafitmatrix eines entsprechenden gepressten Lagergebindes vermieden werden. Im Gegensatz zu grossvolumigen Transportstoffdämpfern für oft über 100 Tonnen schwere Transportbehälter, die für grosse Fallhöhen bei Unfallsituationen aufwendig ausgelegt sind, genügt im vorliegenden Fall lediglich eine geringe dämpfende Wirkung, die .die Dicke der Kantenschutztöpfe (2, 3) nur wenig vergrössert. Die Dicke der Kantenschutztöpfe (2, 3) an sich beträgt normalerweise nur 2-5 cm.The round or square storage containers (1) are provided with a shock-sensitive corrosion protection cover (16). They are designed as containers with lids (11) or as graphite blocks, contain radioactive substances (19) and in many cases have a weight of approx. 10-12 tons. The upper area of the storage container (1) is surrounded by a cover edge protection pot (3), this designation this also applies to containers that do not have an actual lid, but are made of pressed material on all sides. The lower area is surrounded by a bottom edge protection pot (2). Lid edge protection pot (3) and bottom edge protection pot (2) can be made of cheap metallic material. Both can be put on the container (1), inserted or directly attached to the storage container (1), for example glued. Bottom edge protection pot (2) and lid edge protection pot (3) are detachably connected to one another via a lifting plate (4) by means of metallic lifting bars (5). The diameter of the lifting bars can be approx. 2 cm. The number of lifting rods (5) depends on the geometry of the storage container (1). In the case of a storage container with a cylindrical geometry, it is advisable to use 3 lifting rods. The lifting rods (5) have an angled section (14) on the foot side, which are latched into recesses (13) in the bottom edge protection pot (2) when handling the storage container (1). The upper part of the lifting rods (5) is rotatably guided through bores (6) which are located in the lifting plate (4) and has elements (7), for example levers, which can be remotely controlled on the head side. The lifting plate (4) is equipped with carrying devices (8), for example with an eyelet for a crane hook or with a gripping mushroom. After the storage container (1) has been lowered into the borehole, the lifting rods (5) are released from the recesses (13) by rotating the elements (7) so that the lifting plate (4) with the lifting rods (5) for the next storage container, Repository containers or press blocks can be used while the edge protection pots (2, 3) remain on the stored container (1) and ensure the protection of the particularly sensitive edges even after handling mountain movements. The height of the protective walls (9, 10) of the edge protection pots (2, 3) is selected so that the peripheral regions of the storage container (1), which are also exposed to the rock mechanics, are also protected. It is particularly advantageous if the height of the protective wall (9) of the cover edge protection pot (3) is greater than the thickness of the cover (11) in the event that the storage container (1) is a final storage container closed with a cover. As a result, the seal between the container lid (11) and the container body (20) is covered and thus protected. Since usually several storage containers (1) are placed directly on top of one another, it is advantageous if the bottom edge protection pot (2) and / or the top edge protection pot (3) carry energy-consuming elements in the form of shock absorbers (18), for example a honeycomb structure, spring elements or insulating material. This means that even if the storage container is occasionally placed inattentively and hard, a load on the sensitive corrosion protection coating or the graphite matrix of a corresponding pressed storage container can be avoided. In contrast to large-volume transport dampers for transport containers, often weighing over 100 tons, which are designed for large drop heights in the event of an accident, only a slight damping effect is sufficient in the present case, which increases the thickness of the edge protection pots (2, 3) only slightly. The thickness of the edge protection pots (2, 3) per se is normally only 2-5 cm.

Es ist besonders günstig, wenn die Hebestäbe (5) in Aussparungen oder Bohrungen (12), die sich axial in der Schutzwand (9) des Deckelkantenschutztopfes (3) befinden, durchgeführt sind und in die Schutzwand (10) des Bodenkantenschutztopfes (2) in entsprechende Gewindebohrungen (15) eingeschraubt sind. Da in diesem Fall auch die Hebeplatte (4) im Durchmesser reduziert werden kann, ergibt sich die Möglichkeit, das Bohrloch - oder in anderen Fällen die Stapelgeometrie - geringer auszulegen.It is particularly advantageous if the lifting rods (5) are carried out in recesses or bores (12) which are located axially in the protective wall (9) of the lid edge protection pot (3) and in the protective wall (10) of the bottom edge protection pot (2) in corresponding threaded holes (15) are screwed in. Since the diameter of the lifting plate (4) can also be reduced in this case, there is the possibility of making the borehole - or in other cases the stack geometry - smaller.

Von Vorteil ist es auch, wenn der Bodenkantenschutztopf (2) und der Deckelkantenschutztopf (3) innenseitig im Scheitel des zwischen der jeweiligen Schutzwand (9, 10) und des jeweiligen Bodens gebildeten Winkels eine umlaufende Hohlkehle (17) aufweisen. Dadurch liegen die besonders gefährdeten Kanten der Korrosionsschutzhülle (16) frei in den Kantenschutztöpfen (2, 3). Der Winkel beträgt normalerweise etwa 90°, er kann jedoch auch geringfügig grösser, d.h. die Kantenschutztopfform innen leicht konisch sein.It is also advantageous if the bottom edge protection pot (2) and the top edge protection pot (3) have a circumferential groove (17) on the inside at the apex of the angle formed between the respective protective wall (9, 10) and the respective base. As a result, the particularly endangered edges of the corrosion protection cover (16) are exposed in the edge protection pots (2, 3). The angle is usually around 90 °, but it can also be slightly larger, i.e. the shape of the edge protector is slightly conical on the inside.

Die erfindungsgemässe Vorrichtung stellt nicht nur einen wirksamen Schutz des stossempfindlichen Korrosionsschutzmaterials der Lagergebinde gegen mechanische Beschädigungen wie Risse, Abplatzungen und Ausbrüche dar, sondern ist auch einfach und sicher zu handhaben. Das ist wegen des radioaktiven Inhalts der Lagergebinde von grossem Vorteil. Die Vorrichtung ist zudem einfach herstellbar. Die Kantenschutztöpfe können aus billigem Material bestehen. Die Halterung der Hebestäbe (5) im Bodenkantenschutztopf (2) ist sicher, wobei auch andere Einklinkungsarten möglich sind. Die Lagerkapazität in den Kavernen oder Bohrlöchern der Gesteins- oder Salzformationen wird optimal ausgenützt, das Lagergebinde selbst kann gewichtssparend ausgelegt werden, sofern beim Transport und dem Einlagerungsvorgang entsprechende Strahlenschutzmassnahmen getroffen werden.The device according to the invention not only represents effective protection of the shock-sensitive corrosion protection material of the storage containers against mechanical damage such as cracks, spalling and breakouts, but is also simple and safe to use. This is of great advantage because of the radioactive content of the storage containers. The device is also easy to manufacture. The edge protection pots can be made of cheap material. The lifting rods (5) are held securely in the bottom edge protection pot (2), although other types of engagement are also possible. The storage capacity in the caverns or boreholes of the rock or salt formations is optimally used, the storage container itself can be designed to save weight, provided that appropriate radiation protection measures are taken during transport and the storage process.

Claims (5)

1. An apparatus forthe handling and protection of a storage cask (20) for radioactive substances (19) provided with a corrosion prevention sleeve (16) which is sensitive to impacts, in particular a final storage container which is sensitive to impacts and is sealed by a cover (11) during the final storage in bore holes of geological formations, characterised in that it is composed of a base edge protective pot (2) surrounding the edges in the lower region of the storage cask (1) and a cover edge protective pot (3) surrounding the edges in the upper region of the storage cask and in that the base edge protective pot (2) is detachably connected by lifting rods (5) to a lifting plate (4) provided with holding devices (8) for a hoist, the lifting plate (4) being arranged above the cover edge protective pot (3) and the lifting rods (5) having at their head end remotely controlled elements (7) for fixing and releasing the lifting rods (5).
2. An apparatus according to claim 1, characterised in that the height of the protective wall (9) of the cover edge protective pot (3) is greater than the thickness of the cover (11) of the final storage container (1).
3. An apparatus according to claims 1 and 2, characterised in that the lifting rods (5) are guided in recesses or passages (12) located axially in the protective wall (9) of the cover edge protective pot (3) and are screwed into the protective wall (10) of the base edge protective pot (2).
4. An apparatus according to claims 1 to 3, characterised in that the base protective pot (2) and/or the cover edge protective pot (3) is provided with a shock absorber (18) on the external surface.
5. An apparatus according to claims 1 to 4, characterised in that the base edge protective pot (2) and the cover edge protective pot (3) have an encircling groove (7) internally in the apex of the angle formed between the respective protective wall (9, 10) and the respective base.
EP84106786A 1983-06-24 1984-06-14 Device for handling and protecting containers for radioactive materials Expired EP0129782B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3322770A DE3322770C2 (en) 1983-06-24 1983-06-24 Device for handling and protecting storage containers for radioactive substances
DE3322770 1983-06-24

Publications (2)

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EP0129782A1 EP0129782A1 (en) 1985-01-02
EP0129782B1 true EP0129782B1 (en) 1987-05-13

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EP84106786A Expired EP0129782B1 (en) 1983-06-24 1984-06-14 Device for handling and protecting containers for radioactive materials

Country Status (7)

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US (1) US4625122A (en)
EP (1) EP0129782B1 (en)
JP (1) JPS6018800A (en)
BR (1) BR8403021A (en)
CA (1) CA1214288A (en)
DE (2) DE3322770C2 (en)
ES (1) ES289722Y (en)

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Also Published As

Publication number Publication date
BR8403021A (en) 1985-05-28
CA1214288A (en) 1986-11-18
US4625122A (en) 1986-11-25
DE3322770C2 (en) 1985-10-03
EP0129782A1 (en) 1985-01-02
JPS6018800A (en) 1985-01-30
ES289722Y (en) 1986-10-01
DE3322770A1 (en) 1985-01-10
DE3463703D1 (en) 1987-06-19
ES289722U (en) 1986-03-01

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