EP0146451A1 - Neutron-absorting insert for a container for transporting radioactive rods or materials, and container comprising such an insert - Google Patents

Neutron-absorting insert for a container for transporting radioactive rods or materials, and container comprising such an insert Download PDF

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Publication number
EP0146451A1
EP0146451A1 EP84402408A EP84402408A EP0146451A1 EP 0146451 A1 EP0146451 A1 EP 0146451A1 EP 84402408 A EP84402408 A EP 84402408A EP 84402408 A EP84402408 A EP 84402408A EP 0146451 A1 EP0146451 A1 EP 0146451A1
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EP
European Patent Office
Prior art keywords
container
insert
tube
coating
inserts
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.)
Withdrawn
Application number
EP84402408A
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German (de)
French (fr)
Inventor
Roger Huet
Marie-Josephe Francillon
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.)
FONDERIE ALCOA-MG SA
Original Assignee
FONDERIE ALCOA-MG SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by FONDERIE ALCOA-MG SA filed Critical FONDERIE ALCOA-MG SA
Publication of EP0146451A1 publication Critical patent/EP0146451A1/en
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F5/00—Transportable or portable shielded containers
    • G21F5/005—Containers for solid radioactive wastes, e.g. for ultimate disposal
    • G21F5/008—Containers for fuel elements
    • 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
    • G21F5/005—Containers for solid radioactive wastes, e.g. for ultimate disposal
    • G21F5/008—Containers for fuel elements
    • G21F5/012—Fuel element racks in the containers

Abstract

Insert for the housing of a rod of radioactive material, intended to be trapped in a transport container for such rods, characterised in that it comprises a metal tube (5) of square cross-section, a first cladding of the tube by means of a tape (7) of boron fabric, wound helically around this tube so that the successive turns (8) partially overlap and a second cladding by means of a tape (9) of fabric made of a material of high mechanical strength and heat resistance, wound helically around the preceding so that the successive turns (10) partially overlap, the aluminium alloy of the container coming directly into contact with this second cladding. Containers for radioactive rods and materials made in a single block by casting an alloy, for example of aluminium, around such inserts. <IMAGE>

Description

La présente invention se rapporte aux conteneurs destinés au transport de barres d'uranium irradié, et en particulier à des inserts neutrophages ou absorbeurs de neutrons équipant de tels conteneurs, pour le logement desdites barres ou barreaux en matériaux fortement radioactifs.The present invention relates to containers for transporting irradiated uranium bars, and in particular to neutron absorbing inserts or neutron absorbers fitted to such containers, for the accommodation of said bars or bars made of highly radioactive materials.

Les conteneurs destinés aux barres d'uranium irradié sont généralement réalisés avec un alliage d'aluminium dit neutrophage comportant en solution du bore, du cadmium et de l'hafnium. Leur longueur s'établit entre 6 et 10 mètres par juxtaposition de plusieurs tronçons reliés entre eux de manière parfaitement étanche, lesdits conteneurs comportant des logements de barres et des canaux de fluide de refroidissement autour de ces logements.The containers intended for irradiated uranium bars are generally made with an aluminum alloy called neutron absorbing comprising in solution boron, cadmium and hafnium. Their length is established between 6 and 10 meters by juxtaposition of several sections interconnected in a perfectly sealed manner, said containers comprising bar housings and coolant channels around these housings.

Il est nécessaire que les calories provenant des barres d'uranium irradié soient évacuées par les canaux de refroidissement, ce qui implique qu'aucun barrage thermique n'existe dans l'épaisseur de métal séparant logement et canaux.It is necessary that the calories coming from the irradiated uranium bars are evacuated by the cooling channels, which implies that no thermal barrier exists in the thickness of metal separating housing and channels.

Les logements de barres sont réalisés d'un seul bloc avec le conteneur, celui-ci étant alors coulé en un alliage d'aluminium neutrophage comme mentionné plus haut, ou ils sont réalisés au moyen d'un insert en un acier spécial inoxydable pouvant contenir du bore et d'autres éléments ayant les mêmes propriétés neutrophages.The bar housings are made in one piece with the container, the latter then being cast in a neutron absorbing aluminum alloy as mentioned above, or they are made by means of an insert made of a special stainless steel which may contain boron and other elements with the same neutron-absorbing properties.

Les conteneurs ainsi conçus sont de réalisation très délicate. Lorsqu'ils sont réalisés en un alliage d'aluminium neutrophage, contenant du bore, du cadmium et d'autres éléments absorbeurs de neutrons, pour ménager des logements de barre d'un bloc avec ces conteneurs, la mise en oeuvre de cet alliage présente de réelles difficultés techniques, par suite des liquations qui obligent à une agitation permanente du métal liquide avant coulée, avec toutes les oxydations et pertes qui en résultent.The containers thus designed are very delicate to produce. When they are made of a neutron-absorbing aluminum alloy, containing boron, cadmium and other neutron absorbing elements, to provide bar housings of a block with these containers, the use of this alloy presents real technical difficulties, as a result of the liquations which require permanent agitation of the liquid metal before casting, with all the oxidations and losses which result therefrom.

Par ailleurs, si on a recours à des logements de barres sous forme d'inserts en acier au carbure de bore, on observe généralement des problèmes de santé métallique de l'alliage d'aluminium coulé contre ces aciers, par suite de la très grande porosité du carbure, qui lors de la coulée, dégage des bulles gazeuses restant occluses dans le métal après solidification.In addition, if one uses bar housings in the form of boron carbide steel inserts, there are generally metallic health problems of the aluminum alloy cast against these steels, as a result of the very high porosity of the carbide, which during casting releases gas bubbles remaining occluded in the metal after solidification.

D'une manière générale, la présence instable du bore dans les alliages coulés, amène de grandes difficultés techniques et représente un risque certain pour la sécurité des fondeurs.In general, the unstable presence of boron in cast alloys brings great technical difficulties and represents a certain risk for the safety of founders.

La présente invention a pour objet la réalisation de conteneurs pour le transport de barres d'uranium irradié, logées dans des inserts emprisonnés dans lesdits conteneurs, ceux-ci ne présentant pas les divers inconvénients mentionnés ci-dessus, et permettant en particulier un très bon refroidissement de ces barres.The present invention relates to the production of containers for the transport of irradiated uranium bars, housed in inserts trapped in said containers, the latter not having the various drawbacks mentioned above, and in particular allowing very good cooling of these bars.

Un insert selon l'invention pour le logement d'une barre de matériau radioactif, destiné à être emprisonné dans un conteneur de transport de telles barres, ce conteneur étant réalisé par coulée d'un alliage par exemple d'aluminium, est caractérisé en ce qu'il comprend un tube métallique de section carrée, dont la surface extérieure peut porter une revêtement de cadmium, un premier enrobage de ce tube au moyen d'un ruban de tissu de bore, enroulé en spirale autour de ce tube de manière que les spires successives se recouvrent partiellement, et un second enrobage au moyen d'un ruban de matériau à résistance mécanique et thermique élevées, par exemple consistant en un tissu de fibres de carbone, enroulé en spirale autour du précédent de manière que les spires successives se recouvrent partiellement, l'alliage d'aluminium du conteneur venant directement au contact de ce second enrobage.An insert according to the invention for housing a bar of radioactive material, intended to be trapped in a container for transporting such bars, this container being produced by casting an alloy, for example of aluminum, is characterized in that that it comprises a metal tube of square section, the outer surface of which can carry a coating of cadmium, a first coating of this tube by means of a ribbon of boron fabric, wound in a spiral around this tube so that the successive turns partially overlap, and a second coating by means of a ribbon of material with high mechanical and thermal resistance, for example consisting of a fabric of carbon fibers, wound in a spiral around the previous one so that the successive turns overlap partially, the aluminum alloy of the container coming directly into contact with this second coating.

Ce tube est réalisé par extrusion d'un alliage d'aluminium, ou en un acier inoxydable spécial.This tube is made by extruding an aluminum alloy, or a special stainless steel.

L'invention fournit également un conteneur réalisé d'un bloc par coulée d'un alliage d'aluminium autour des inserts ci-dessus, des canaux pour le passage d'un fluide de refroidissement étant ménagés entre ces inserts.The invention also provides a container made in one block by casting an aluminum alloy around the above inserts, channels for the passage of a cooling fluid being formed between these inserts.

Les caractéristiques et avantages de l'invention ressortiront d'ailleurs mieux de la description suivante donnée uniquement à titre d'exemple, en référence aux dessins annexés dans lesquels:

  • - la figure 1 est une vue partielle en perspective, avec arrachement, d'un conteneur pour barres d'uranium irradié équipé de logements pour lesdites barres, sous la forme d'inserts selon l'invention;
  • - la figure 2 est une vue en perspective, à plus grande échelle, également avec arrachement, d'un insert réalisé selon l'invention;
  • - la figure 3 est une vue partielle en coupe de la paroi de l'insert de la figure 2.
The characteristics and advantages of the invention will appear more clearly from the following description given solely by way of example, with reference to the appended drawings in which:
  • - Figure 1 is a partial perspective view, broken away, of a container for irradiated uranium bars equipped with housings for said bars, in the form of inserts according to the invention;
  • - Figure 2 is a perspective view, on a larger scale, also with parts broken away, of an insert produced according to the invention;
  • - Figure 3 is a partial sectional view of the wall of the insert of Figure 2.

Dans la forme de réalisation choisie et représentée à la figure 1, le conteneur 1, réalisé selon l'invention, est constitué de neuf inserts 2, de section carrée, destinés à recevoir chacun une barre d'uranium irradié, prisonniers dans un corps cylindrique 3, dans lequel sont ménagés des canaux de refroidissement 4, disposés autour des inserts 2 et entre ceux-ci.In the embodiment chosen and represented in FIG. 1, the container 1, produced according to the invention, consists of nine inserts 2, of square section, each intended to receive a bar of irradiated uranium, trapped in a cylindrical body 3, in which cooling channels 4 are arranged, arranged around the inserts 2 and between them.

Le corps 3 du conteneur 1 est réalisé d'un bloc autour des inserts 2, par coulée d'un alliage d'aluminium autour de ceux-ci, en ménageant les canaux de refroidissement 4.The body 3 of the container 1 is produced in a block around the inserts 2, by casting an aluminum alloy around them, providing the cooling channels 4.

Chaque insert 2 comprend, selon l'invention, un tube 5 de section carrée, en alliage d'aluminium extrudé, ou en acier inoxydable spécial. C'est dans ce tube que sera logée la barre d'uranium irradié.Each insert 2 comprises, according to the invention, a tube 5 of square section, made of extruded aluminum alloy, or of special stainless steel. It is in this tube that the irradiated uranium bar will be housed.

Sur sa surface extérieure, le tube 5 reçoit un revêtement de cadmium 6, soit par dépôt électrolytique, soit en shoopage.On its outer surface, the tube 5 receives a coating of cadmium 6, either by electrolytic deposition or by shooping.

Cette surface extérieure cadmiée est enrobée au moyen d'un tissu de bore 7, sous la forme d'un ruban enroulé en spirale autour du tube 5, les spires successives 8 se recouvrant partiellement de manière à éviter toute fuite entre deux spires consécutives.This cadmium-coated outer surface is coated with a boron fabric 7, in the form of a ribbon wound in a spiral around the tube 5, the successive turns 8 partially overlapping so as to avoid any leakage between two consecutive turns.

Autour de ce premier enrobage au moyen d'un tissu de bore, est disposé un second enrobage 9, cette fois au moyen d'un ruban en tissu de fibres de carbone, également enroulé en spirale pour former des spires successives 10 se recouvrant partiellement.Around this first coating by means of a boron fabric, is disposed a second coating 9, this time by means of a ribbon of carbon fiber fabric, also wound in a spiral to form successive turns 10 partially overlapping.

Ce second enrobage 9 assure la protection du tissu de bore lors de la coulée de l'alliage d'aluminium du corps du conteneur, en évitant à ce tissu tout contact direct avec cet alliage.This second coating 9 protects the boron fabric during the casting of the aluminum alloy from the body of the container, by preventing this fabric from direct contact with this alloy.

Les fibres de carbone constituant ce second enrobage présentent, en outre, le mérite d'être très bonnes conductrices de la chaleur, et de faciliter ainsi l'évacuation des calories provenant de la barre d'uranium vers le fluide des canaux de refroidissement.The carbon fibers constituting this second coating also have the advantage of being very good conductors of heat, and thus of facilitating the evacuation of the calories coming from the uranium bar towards the fluid of the cooling channels.

Par ailleurs, ces fibres de carbone ne risquent pas d'être dissoutes par l'alliage d'aluminium liquide qui les recouvre lors de la coulée du conteneur monobloc l.et présentent une haute résistance mécanique et thermique.Furthermore, these carbon fibers are not likely to be dissolved by the liquid aluminum alloy which covers them during the casting of the one-piece container l. And have a high mechanical and thermal resistance.

La réalisation d'un conteneur selon l'invention est grandement simplifiée par rapport à celle d'un conteneur traditionnel: il n'est plus nécessaire de recourir à des alliages neutrophages de mise en oeuvre difficile et dangereuse.The production of a container according to the invention is greatly simplified compared to that of a traditional container: it is no longer necessary to use neutron-absorbing alloys for processing difficult and dangerous.

Insert et conteneur selon l'invention conduisent, de ce fait, à d'importantes économies de fabrication.Insert and container according to the invention therefore lead to significant manufacturing savings.

Bien entendu, l'invention n'est pas limitée à la forme de réalisation décrite, qui peut faire l'objet de variantes portant notamment sur la forme du conteneur, le nombre des inserts, etc.Of course, the invention is not limited to the embodiment described, which can be subject to variants relating in particular to the shape of the container, the number of inserts, etc.

Claims (7)

1.- Insert pour le logement d'une barre en matériau radioactif, destiné à être emprisonné dans un conteneur de transport de telles barres, ce conteneur étant réalisé par coulée d'un alliage tel qu' un alliage d' aluminium, caractérisé en ce qu'il comprend un tube métallique (5) de section carrée, un premier enrobage de ce tube au moyen d'un ruban (7) de tissu de bore, enroulé en spirale autour de ce tube de manière que les spires successives (8) se recouvrent partiellement, et. un second enrobage au moyen d'un ruban (9) de tissu en un matériau à haute résistance mécanique et à la chaleur, enroulé en spirale autour du précédent de manière que les spires successives (10) se recouvrent partiellement, l'alliage d'aluminium du conteneur venant directement au contact de ce second enrobage.1.- Insert for housing a bar of radioactive material, intended to be trapped in a container for transporting such bars, this container being produced by casting an alloy such as an aluminum alloy, characterized in that that it comprises a metal tube (5) of square section, a first coating of this tube by means of a ribbon (7) of boron fabric, wound in a spiral around this tube so that the successive turns (8) partially overlap, and. a second coating by means of a ribbon (9) of fabric made of a material with high mechanical and heat resistance, wound in a spiral around the previous one so that the successive turns (10) partially overlap, the alloy of aluminum of the container coming directly into contact with this second coating. 2.- Insert selon la revendication 1, caractérisé en ce que le tube (5) est réalisé par extrusion d'un alliage d'aluminium.2.- Insert according to claim 1, characterized in that the tube (5) is produced by extrusion of an aluminum alloy. 3.- Insert selon la revendication 1, caractérisé en ce que le tube est en acier inoxydable.3.- Insert according to claim 1, characterized in that the tube is made of stainless steel. 4.- Insert selon l'une des revendications 1 à 3, caractérisé en ce que la surface extérieure du tube métallique (5) comporte un revêtement de cadmium.4.- Insert according to one of claims 1 to 3, characterized in that the outer surface of the metal tube (5) has a coating of cadmium. 5.- Insert selon l'une des revendicationsl à 4, caractérisé en ce que le ruban (9) du second enrobage est réalisé en un tissu à base de fibres de carbone.5.- Insert according to one of claimsl to 4, characterized in that the tape (9) of the second coating is made of a fabric based on carbon fibers. 6.- Conteneur pour le transport de barres de matériau radioactif, caractérisé en ce que ce conteneur (1) est réalisé d'un bloc par coulée d'un alliage d'aluminium autour d'inserts (2) pour le logement desdites barres, selon l'une des revendications 1 à 5, et en ce que des canaux (4) pour le passage d'un fluide de refroidissement sont ménagés entre lesdits inserts.6. Container for transporting bars of radioactive material, characterized in that this container (1) is made in one piece by casting an aluminum alloy around inserts (2) for housing said bars, according to one of claims 1 to 5, and in that channels (4) for the passage of a cooling fluid are formed between said inserts. 7.- Conteneur selon la revendication 6, caractérisé en ce qu'il est formé d'un corps cylindrique (3) à l'intérieur duquel sont disposés longitudinalement plusieurs inserts (2).7.- container according to claim 6, characterized in that it is formed of a cylindrical body (3) inside which are arranged longitudinally several inserts (2).
EP84402408A 1983-12-19 1984-11-26 Neutron-absorting insert for a container for transporting radioactive rods or materials, and container comprising such an insert Withdrawn EP0146451A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8320276 1983-12-19
FR8320276A FR2556877A1 (en) 1983-12-19 1983-12-19 INSERT NEUTROPHAGE FOR CONTAINER FOR TRANSPORTING BARS OR RADIOACTIVE MATERIALS, AND CONTAINER COMPRISING SUCH INSERTS

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EP0146451A1 true EP0146451A1 (en) 1985-06-26

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EP84402408A Withdrawn EP0146451A1 (en) 1983-12-19 1984-11-26 Neutron-absorting insert for a container for transporting radioactive rods or materials, and container comprising such an insert

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FR (1) FR2556877A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2923470A1 (en) * 2007-11-12 2009-05-15 Guillaume Yves Remi Crochemore Internal, intermediate or external assembling device for e.g. glassware package, has spiral or cone shaped flexible bands recessed at centre, and locked on tubular shaped inner layer of package

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1405395A (en) * 1964-05-28 1965-07-09 Lincrusta Container for radioactive products
DE2105581A1 (en) * 1970-08-25 1972-03-02 Dampferzeugerbau Veb K Transit container for irradiated nuclear fuel - with - cylindrical compartments arranged around a central space
US3727060A (en) * 1969-08-13 1973-04-10 Transnucleaire Soc Transports Package for the storage and transportation of radioactive substances containing both neutron and gamma radiation absorbing material
BE830802A (en) * 1975-06-30 1975-10-16 AN ANTI-RADIO-ACTIVITY MAGNETIC INSULATION FOR THE PIPING OF A NUCLEAR POWER PLANT
FR2309019A1 (en) * 1975-04-21 1976-11-19 Pechiney Ugine Kuhlmann Reactor vessel for corrosive fused salt nuclear fuel - with graphite inner liner separated from outer metal shell by carbon based insulant
FR2319075A1 (en) * 1975-07-25 1977-02-18 Commissariat Energie Atomique Thermal insulation and protection of pipeline - carrying e.g. molten sodium, uses a protective winding of combined metal mesh and metal foil
FR2384327A1 (en) * 1977-03-14 1978-10-13 Transnucleaire Transports Ind Packaging for transport of irradiated fuel elements - incorporating empty compartment and neutron poison between groups of housings giving control of criticality
WO1981000642A1 (en) * 1979-08-20 1981-03-05 Elektrowatt Ing Ag Container for carrying radioactive materials
US4303553A (en) * 1978-09-28 1981-12-01 Nippon Asbestos Co., Ltd. Neutron-protection heat insulating material
FR2521337A1 (en) * 1982-02-10 1983-08-12 Mitsui Mining & Smelting Co SEALED CONTAINER FOR RADIOACTIVE WASTE
US4399366A (en) * 1981-04-24 1983-08-16 Bucholz James A Separator assembly for use in spent nuclear fuel shipping cask

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1405395A (en) * 1964-05-28 1965-07-09 Lincrusta Container for radioactive products
US3727060A (en) * 1969-08-13 1973-04-10 Transnucleaire Soc Transports Package for the storage and transportation of radioactive substances containing both neutron and gamma radiation absorbing material
DE2105581A1 (en) * 1970-08-25 1972-03-02 Dampferzeugerbau Veb K Transit container for irradiated nuclear fuel - with - cylindrical compartments arranged around a central space
FR2309019A1 (en) * 1975-04-21 1976-11-19 Pechiney Ugine Kuhlmann Reactor vessel for corrosive fused salt nuclear fuel - with graphite inner liner separated from outer metal shell by carbon based insulant
BE830802A (en) * 1975-06-30 1975-10-16 AN ANTI-RADIO-ACTIVITY MAGNETIC INSULATION FOR THE PIPING OF A NUCLEAR POWER PLANT
FR2319075A1 (en) * 1975-07-25 1977-02-18 Commissariat Energie Atomique Thermal insulation and protection of pipeline - carrying e.g. molten sodium, uses a protective winding of combined metal mesh and metal foil
FR2384327A1 (en) * 1977-03-14 1978-10-13 Transnucleaire Transports Ind Packaging for transport of irradiated fuel elements - incorporating empty compartment and neutron poison between groups of housings giving control of criticality
US4303553A (en) * 1978-09-28 1981-12-01 Nippon Asbestos Co., Ltd. Neutron-protection heat insulating material
WO1981000642A1 (en) * 1979-08-20 1981-03-05 Elektrowatt Ing Ag Container for carrying radioactive materials
US4399366A (en) * 1981-04-24 1983-08-16 Bucholz James A Separator assembly for use in spent nuclear fuel shipping cask
FR2521337A1 (en) * 1982-02-10 1983-08-12 Mitsui Mining & Smelting Co SEALED CONTAINER FOR RADIOACTIVE WASTE

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2923470A1 (en) * 2007-11-12 2009-05-15 Guillaume Yves Remi Crochemore Internal, intermediate or external assembling device for e.g. glassware package, has spiral or cone shaped flexible bands recessed at centre, and locked on tubular shaped inner layer of package

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