EP2320429A1 - Packaging for transporting and/or storing radioactive materials including radially stacked radiation protection elements - Google Patents
Packaging for transporting and/or storing radioactive materials including radially stacked radiation protection elements Download PDFInfo
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- EP2320429A1 EP2320429A1 EP10190308A EP10190308A EP2320429A1 EP 2320429 A1 EP2320429 A1 EP 2320429A1 EP 10190308 A EP10190308 A EP 10190308A EP 10190308 A EP10190308 A EP 10190308A EP 2320429 A1 EP2320429 A1 EP 2320429A1
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- European Patent Office
- Prior art keywords
- elements
- package
- packaging according
- radiological protection
- interface
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Classifications
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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
- G21F5/10—Heat-removal systems, e.g. using circulating fluid or cooling fins
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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
- G21F3/00—Shielding characterised by its physical form, e.g. granules, or shape of the material
-
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
Definitions
- the present invention relates to the field of transport and / or storage of radioactive materials, such as nuclear fuel assemblies, fresh or irradiated.
- the invention relates to a package comprising a radiological protection device arranged between two concentric rings, forming a barrier against gamma radiation.
- storage devices are used, also called “basket” or “rack” storage.
- These storage devices usually of cylindrical shape and of substantially circular section, have a plurality of adjacent housings each adapted to receive a nuclear fuel assembly.
- the storage device is intended to be housed in the cavity of a package to form together with it a container for the transport and / or storage of nuclear fuel assemblies, in which the nuclear material is confined.
- the aforementioned cavity is generally defined by a lateral body extending in a longitudinal direction of the package, this lateral body comprising for example two concentric metal ferrules jointly forming an annular space inside which is housed a radiological protection device, in particular to form a barrier against gamma radiation emitted by the fuel assemblies housed in the cavity.
- the radiological protection device is made using several prefabricated elements made of lead or in one of its alloys, distributed around the cavity, in the appropriate annular space defined by the two metal ferrules.
- each of these elements is inserted between the two ferrules, in a longitudinal insertion direction.
- a mounting clearance must be provided to allow such insertion, this game resulting in a discontinuity of material in the lateral body of the package, in the radial direction in which the inner ring is successively arranged, the protective elements radiological, and the outer shell.
- the discontinuity of material observed has the effect of a considerable decrease in the thermal conductivity of the lateral body of the package, implying a low capacity of the latter to evacuate the heat produced by the fuel assemblies.
- the gaps between the radiological protection elements and the ferrules may be reduced by decreasing manufacturing tolerances, but it is nevertheless very expensive, and does not by any means to eliminate discontinuities matter.
- Another solution consists in separating the radiological protection function from the thermal conduction function, this being then fulfilled by means of additional elements of the fin type connecting the two ferrules, arranged alternately with the radiological protection elements in the radiator. annular space. Nevertheless, this further complicates the design of the package, and also requires the use of special techniques to ensure that the fins are in contact with each of the two side body ferrules.
- the invention therefore aims to at least partially overcome the disadvantages mentioned above, relating to the achievements of the prior art.
- the subject of the invention is a package for transporting and / or storing radioactive materials, said package comprising a lateral body extending around a longitudinal axis of said package, said lateral body forming a cavity of housing of radioactive materials and comprising an inner metal ferrule and an outer metal ferrule, the two ferrules being concentric and together forming an annular space within which is housed a radiation protection device forming a barrier against gamma radiation.
- said radiological protection device comprises at least a first and a second radiological protection metal elements superimposed in a radial direction of the package, said first element being in abutment against the outer shell and said second element being in support against the inner ferrule.
- said first and second elements are in contact with each other in an interface taking, in section along any plane passing through said interface and integrating the longitudinal axis, the shape of a straight line segment inclined by report to this axis.
- the invention thus offers a clever design allowing the radiological protection elements to conduct heat satisfactorily between the two ferrules. Indeed, the heat is conducted continuously first between the inner ferrule and the second radiological protection element through the contact between these parts, then between the contacting faces of the first and second elements, and finally between the first element and the outer shell, always because of the expected contact between these parts.
- the particular geometry and arrangement of the radiological protection elements make it possible to confer on the lateral body of the package a satisfactory thermal conductivity.
- the presence helium or thermal conduction fins is no longer necessary, which allows to present a package design and simplified manufacturing.
- first and second radiological protection elements are no longer intended, as in the prior art, to approach closer to each of the two ferrules, but each being only in contact with the one and remotely on the other of the two ferrules, the manufacturing tolerances of these elements can be increased. This advantageously results in a significant cost reduction.
- the contact force occurring at the interface of the first and second superimposed elements radially is inclined relative to the longitudinal direction.
- the intensity of this contact as well as the intensity of contact between the radiological protection elements and their associated ferrule is therefore dependent on the longitudinal relative position between the elements. Consequently, when one of the two longitudinal sliding protection elements is inserted between its associated ferrule and the other protection element, the contacts, once established, have an intensity which increases as one continues the insertion, which gives the elements a self-tightening character between the ferrules. Increasing the intensity of these contacts is advantageous in that it provides better thermal conduction.
- one and / or the other of the radiological protection elements may be coated with a heat-conducting layer at the contact interface, so that to further improve the thermal conduction between these elements.
- This layer is preferably thin, and deformable, for example made of lead or in one of its alloys.
- this heat conducting layer solution can also be adopted at the contacts between the radiological protection elements and the ferrules.
- said inclined line segment forms with said longitudinal axis an angle (A) of between 1 and 10 °.
- the interface thus inclined allows a satisfactory radial plating of the radiological protection elements against their associated ferrule, when they are forced longitudinally.
- said interface between said first and second elements is plane or frustoconical.
- its surface nature confers a satisfactory overall thermal conductivity to the lateral body of the package.
- the outer surface of the first element bearing against the outer shell is of cross section, or even more preferably in the form of a circular arc of diameter identical to that of the inner surface of the outer shell against which it is supported
- the inner surface of the second element bearing against the inner ferrule is of cross section, or even more preferably in the form of a circular arc of diameter identical to that of the outer surface of the inner ferrule against which it is supported.
- the arcuate sections are preferred, especially when they are centered on the longitudinal axis, as they allow the obtaining of surface contacts between the ferrules and the radiological protection elements.
- each of the first and second members is held only by contacts in the annular space. This implies, in particular, that no additional fastening means is reported between a protective element and its associated shell, or between the two radially superimposed protection elements.
- the design allows these elements to maintain each other by contact, also using ferrules.
- said first and second elements have an identical or different circumferential extent.
- the package comprises a plurality of first radiological protection metal elements as well as a plurality of second radiological protection metal elements, each first element being supported radially solely on one of said plurality of second elements. , and conversely, each pair of first and second elements presenting here preferably an identical circumferential extent.
- the subject of the invention is also a process for manufacturing a package as described above, in which first one of said first and second elements is placed in the annular space and then inserted longitudinally the other of said first and second elements between its associated ferrule and the element already in place.
- a container 1 for the transport and / or storage of nuclear fuel assemblies we see a container 1 for the transport and / or storage of nuclear fuel assemblies. It is recalled in this respect that the invention is in no way limited to the transport / storage of this type of nuclear material.
- the container 1 generally comprises a packaging 2 object of the present invention, inside which there is a storage device 4, also called storage basket.
- the device 4 is intended to be placed in a housing cavity 6 of the package 2, as schematically shown in FIG. figure 1 on which it is also possible to see the longitudinal axis 8 of this package, coincident with the longitudinal axes of the storage device and the housing cavity.
- the term “longitudinal” should be understood as parallel to the longitudinal axis 8 and the longitudinal direction X of the package, and the term “circumferential” should be understood as orthogonal to the same longitudinal axis 8, and a transverse direction / radial R of the package.
- the storage device 4 comprises a plurality of adjacent housings arranged parallel to the axis 8, the latter being each adapted to receive at least one fuel assembly of square or rectangular section, and preferably only one.
- the container 1 and this device 4 have been shown in a vertical loading / unloading position of the fuel assemblies, different from the horizontal / recumbent position usually adopted during the transportation of the assemblies.
- the package 2 has essentially a bottom 10 on which the device 4 is intended to rest in a vertical position, a cover 12, and a lateral body 14 extending around and along the axis longitudinal 8, this body 14 defining a packaging opening for penetrating the basket into the housing cavity 6, and then being closed by the cover 12.
- this lateral body 14 which defines the housing cavity 6, with the aid of a lateral inner surface 16 of substantially cylindrical shape and of circular section, and of axis coincident with the axis 8.
- the bottom 10, which defines the bottom of the cavity 6 open at the cover 12, can be made in one piece with at least a portion of the lateral body 14, without departing from the scope of the invention.
- FIG 2 a part of the lateral body 14, which firstly has two concentric metal ferrules jointly forming an annular space 18 centered on the longitudinal axis of the package (not visible in this figure), can be seen in detail, this space 18 housing a radiological protection device 20 specific to the present invention.
- the ferrules 22, 24 are for example steel.
- This protection device 20 is in particular designed to form a barrier against gamma radiation emitted by the irradiated fuel assemblies housed in the cavity 6. Thus, it is housed between the inner shell 22 whose inner surface corresponds to the inner lateral surface 16 of the cavity 6, and the outer shell 24.
- the protection device 20 comprises a plurality of first and second radiological protection elements, respectively referenced 30 and 32.
- the elements are grouped in pairs each comprising a first element 30. and a second element 32 superimposed radially, the pairs being adjacent and in contact in the circumferential direction T, also called the tangential direction.
- the number of these pairs of elements 30, 32 may be several tens.
- the first and second elements 30, 32 are metallic, preferably lead or cast iron blocks or in one of their alloys, this type of material making it possible to provide both a radiological protection against gamma radiation, and a satisfactory thermal conductivity.
- the first and second elements 30, 32 have a very close shape, while being positioned inversely in the longitudinal direction, as will become clear later.
- each first element 30 its outer surface is supported, and more preferably in direct contact, against the inner surface 24a of the outer shell 24.
- This contact is preferably surface-based, over the entire surface of the block 30 which is located facing the inner surface 24a.
- its outer surface has in cross section a convex circular arc shape of diameter close to or identical to that of the inner surface 24a, and of the same center, even if a straight cut could be envisaged, without leaving the frame of the invention.
- This second element 32 has its inner surface bearing, and more preferably in direct contact, against the outer surface 22a of the inner ferrule 22.
- This contact is preferably surface-based, over the entire surface of the block 32 which is facing the surface outside 22a.
- its outer surface here has, in cross section, a concave arc shape of diameter close to or identical to that of the outer surface 22a, and the same center, even if a cross section could also be considered.
- the two elements 30, 32 of each pair have an identical circumferential extent, and are superimposed perfectly in the radial direction. In other words, each of them is only in radial support on the other element of the pair, which also results in the same angular setting of the two elements of identical circumferential extent.
- the circumferentially succeeding pairs of elements 30, 32 may also have identical or different circumferential extents.
- each first element 30 and the outer surface of the second element 32 associated with it are in surface contact, at an interface referenced 40 in the figures.
- This interface is flat or frustoconical, that is to say, in the latter case, it takes the form of an angular portion of a frustoconical surface.
- the interface 40 has, in section passing through any longitudinal plane passing through it and integrating the axis 8, the shape of a line segment inclined at an angle A with respect to a longitudinal straight line 42 parallel to the direction X.
- This angle A is preferably low, for example between 1 and 10 °, as shown in FIG. figure 3 .
- the interfaces between the ferrules and their associated element are in turn segments of straight lines parallel to the direction X. Therefore, one of the elements 30, 32 has a section that tapers in a given direction of the longitudinal direction X, while the other element presents a section that tapers analogously in the opposite direction to said given direction.
- each plane interface 40 takes the form of a line segment oriented substantially circumferentially, and more precisely orthogonally to a radial line 41 passing through the middle of this segment, and obviously by the longitudinal axis 8 (not visible on the figure 2 ).
- the heat generated by the assemblies is conducted continuously between the two rings 22, 24, which gives a satisfactory thermal conductivity to the lateral body.
- the heat is firstly conducted between the inner ferrule 22 and the second element 32 of each pair, then between the first and second elements 30, 32 in contact, and finally between the first elements 30 and the outer ferrule 24.
- One of the main advantages of this solution lies in obtaining continuous privileged paths of thermal conduction between the two rings, with elements 30, 32 of simple form, each in contact with only one of these two rings.
- each of the elements 30, 32 is therefore maintained solely by contacts in the annular space 18, each of them being pressed against one of the ferrules and against the protective element being superimposed on it radially.
- the second element 32 is first placed in the annular space 18, against the outer surface 22a of the ferrule 22. Its tapered portion is then close to the opening of the package, while its other end, the thickest, for example rests on the bottom of the package.
- the first element 30 is slid longitudinally between the outer shell 24 and the element 32 already in place, with its tapered end progressively approaching the thick end of this element 32. This sliding is operated until the surface contact at the interface between the two elements 30, 32, and obtaining a surface contact between the first element 30 and the inner surface 24a of the ferrule 24.
- pairs of elements are preferably mounted successively, although it may be considered to place first the set of the second or all of the first elements of all the couples, over 360 °, then slide all the other elements in the annular space.
- each first element 30 is in radial abutment against two second elements 32 directly adjacent in the circumferential direction, and vice versa.
- the circumferential extent of each of the elements 30, 32 is indifferently the same or different.
- figure 6 shows a third preferred embodiment in which there is provided a single first element 30 in the form of ferrule and a single second element 32 also in the form of ferrule, the interface 40 here being frustoconical, centered on the 8 axis (not shown) ferrules.
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- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Packages (AREA)
- Packaging Of Annular Or Rod-Shaped Articles, Wearing Apparel, Cassettes, Or The Like (AREA)
Abstract
Description
La présente invention se rapporte au domaine du transport et/ou entreposage de matières radioactives, tels que des assemblages de combustible nucléaire, frais ou irradiés.The present invention relates to the field of transport and / or storage of radioactive materials, such as nuclear fuel assemblies, fresh or irradiated.
En particulier, l'invention concerne un emballage comprenant un dispositif de protection radiologique agencé entre deux viroles concentriques, formant barrière contre les rayonnements gamma.In particular, the invention relates to a package comprising a radiological protection device arranged between two concentric rings, forming a barrier against gamma radiation.
Classiquement, pour assurer le transport et/ou entreposage d'assemblages de combustible nucléaire, il est utilisé des dispositifs de rangement, également appelés « panier » ou « râtelier » de rangement. Ces dispositifs de rangement, habituellement de forme cylindrique et de section sensiblement circulaire, disposent d'une pluralité de logements adjacents chacun apte à recevoir un assemblage de combustible nucléaire. Le dispositif de rangement est destiné à être logé dans la cavité d'un emballage afin de former conjointement avec celui-ci un conteneur pour le transport et/ou entreposage d'assemblages de combustible nucléaire, dans lequel la matière nucléaire est confinée.Conventionally, for the transportation and / or storage of nuclear fuel assemblies, storage devices are used, also called "basket" or "rack" storage. These storage devices, usually of cylindrical shape and of substantially circular section, have a plurality of adjacent housings each adapted to receive a nuclear fuel assembly. The storage device is intended to be housed in the cavity of a package to form together with it a container for the transport and / or storage of nuclear fuel assemblies, in which the nuclear material is confined.
La cavité précitée est généralement définie par un corps latéral s'étendant selon une direction longitudinale de l'emballage, ce corps latéral comprenant par exemple deux viroles métalliques concentriques formant conjointement un espace annulaire à l'intérieur duquel est logé un dispositif de protection radiologique, en particulier pour former une barrière contre les rayonnements gamma émis par les assemblages de combustible logés dans la cavité.The aforementioned cavity is generally defined by a lateral body extending in a longitudinal direction of the package, this lateral body comprising for example two concentric metal ferrules jointly forming an annular space inside which is housed a radiological protection device, in particular to form a barrier against gamma radiation emitted by the fuel assemblies housed in the cavity.
Classiquement, le dispositif de protection radiologique est réalisé à l'aide de plusieurs éléments préfabriqués en plomb ou dans l'un de ses alliages, répartis autour de la cavité, dans l'espace annulaire approprié défini par les deux viroles métalliques.Conventionally, the radiological protection device is made using several prefabricated elements made of lead or in one of its alloys, distributed around the cavity, in the appropriate annular space defined by the two metal ferrules.
Pour ce faire, chacun de ces éléments est inséré entre les deux viroles, selon une direction d'insertion longitudinale. Ainsi, un jeu de montage doit être prévu pour autoriser une telle insertion, ce jeu ayant pour conséquence une discontinuité de matière dans le corps latéral de l'emballage, selon la direction radiale dans laquelle sont agencés successivement la virole intérieure, les éléments de protection radiologique, et la virole extérieure. La discontinuité de matière observée a pour effet une baisse considérable de la conductivité thermique du corps latéral de l'emballage, impliquant une faible capacité de ce dernier à évacuer la chaleur produite par les assemblages de combustible.To do this, each of these elements is inserted between the two ferrules, in a longitudinal insertion direction. Thus, a mounting clearance must be provided to allow such insertion, this game resulting in a discontinuity of material in the lateral body of the package, in the radial direction in which the inner ring is successively arranged, the protective elements radiological, and the outer shell. The discontinuity of material observed has the effect of a considerable decrease in the thermal conductivity of the lateral body of the package, implying a low capacity of the latter to evacuate the heat produced by the fuel assemblies.
Pour minimiser l'impact négatif des discontinuités de matière, les jeux entre les éléments de protection radiologique et les viroles peuvent être réduits en diminuant les tolérances de fabrication, mais cela s'avère néanmoins très coûteux, et ne permet nullement de supprimer les discontinuités de matière.To minimize the negative impact of material discontinuities, the gaps between the radiological protection elements and the ferrules may be reduced by decreasing manufacturing tolerances, but it is nevertheless very expensive, and does not by any means to eliminate discontinuities matter.
D'autres moyens peuvent être employés pour atténuer la perte d'efficacité thermique, comme celui visant à injecter de l'hélium dans les espaces vides. Cependant, cette technique induit un coût et pose des problèmes sérieux d'exploitation de l'emballage.Other means may be employed to mitigate the loss of thermal efficiency, such as that for injecting helium into empty spaces. However, this technique entails a cost and poses serious problems of operation of the package.
Une autre solution consiste à séparer la fonction de protection radiologique de celle de conduction thermique, celle-ci étant alors remplie à l'aide d'éléments additionnels du type ailettes reliant les deux viroles, agencées en alternance avec les éléments de protection radiologique dans l'espace annulaire. Néanmoins, cela complique davantage la conception de l'emballage, et nécessite par ailleurs l'utilisation de techniques particulières pour s'assurer que les ailettes se trouvent bien au contact de chacune des deux viroles du corps latéral.Another solution consists in separating the radiological protection function from the thermal conduction function, this being then fulfilled by means of additional elements of the fin type connecting the two ferrules, arranged alternately with the radiological protection elements in the radiator. annular space. Nevertheless, this further complicates the design of the package, and also requires the use of special techniques to ensure that the fins are in contact with each of the two side body ferrules.
L'invention a donc pour but de remédier au moins partiellement aux inconvénients mentionnés ci-dessus, relatifs aux réalisations de l'art antérieur.The invention therefore aims to at least partially overcome the disadvantages mentioned above, relating to the achievements of the prior art.
Pour ce faire, l'invention a pour objet un emballage pour le transport et/ou l'entreposage de matières radioactives, ledit emballage comprenant un corps latéral s'étendant autour d'un axe longitudinal dudit emballage, ledit corps latéral formant une cavité de logement des matières radioactives et comprenant une virole métallique intérieure et une virole métallique extérieure, les deux viroles étant concentriques et formant conjointement un espace annulaire à l'intérieur duquel est logé un dispositif de protection radiologique formant barrière contre les rayonnements gamma.To do this, the subject of the invention is a package for transporting and / or storing radioactive materials, said package comprising a lateral body extending around a longitudinal axis of said package, said lateral body forming a cavity of housing of radioactive materials and comprising an inner metal ferrule and an outer metal ferrule, the two ferrules being concentric and together forming an annular space within which is housed a radiation protection device forming a barrier against gamma radiation.
Selon l'invention, ledit dispositif de protection radiologique comprend au moins un premier et un second éléments métalliques de protection radiologique superposés selon une direction radiale de l'emballage, ledit premier élément étant en appui contre la virole extérieure et ledit second élément étant en appui contre la virole intérieure. De plus, lesdits premier et second éléments sont au contact l'un de l'autre selon une interface prenant, en coupe selon un plan quelconque passant par ladite interface et intégrant l'axe longitudinal, la forme d'un segment de droite incliné par rapport à cet axe.According to the invention, said radiological protection device comprises at least a first and a second radiological protection metal elements superimposed in a radial direction of the package, said first element being in abutment against the outer shell and said second element being in support against the inner ferrule. In addition, said first and second elements are in contact with each other in an interface taking, in section along any plane passing through said interface and integrating the longitudinal axis, the shape of a straight line segment inclined by report to this axis.
L'invention offre ainsi une conception astucieuse permettant aux éléments de protection radiologique de conduire la chaleur de manière satisfaisante entre les deux viroles. En effet, la chaleur est conduite de manière continue tout d'abord entre la virole intérieure et le second élément de protection radiologique grâce au contact entre ces pièces, puis entre les faces en contact des premier et second éléments, et enfin entre le premier élément et la virole extérieure, toujours en raison du contact prévu entre ces pièces.The invention thus offers a clever design allowing the radiological protection elements to conduct heat satisfactorily between the two ferrules. Indeed, the heat is conducted continuously first between the inner ferrule and the second radiological protection element through the contact between these parts, then between the contacting faces of the first and second elements, and finally between the first element and the outer shell, always because of the expected contact between these parts.
Ainsi, la géométrie et la disposition particulières des éléments de protection radiologique permettent de conférer au corps latéral de l'emballage une conductivité thermique satisfaisante. La présence d'hélium ou d'ailettes de conduction thermique n'est donc plus nécessaire, ce qui permet de présenter un emballage de conception et de fabrication simplifiées.Thus, the particular geometry and arrangement of the radiological protection elements make it possible to confer on the lateral body of the package a satisfactory thermal conductivity. The presence helium or thermal conduction fins is no longer necessary, which allows to present a package design and simplified manufacturing.
En outre, les premiers et seconds éléments de protection radiologique n'étant plus destinés, comme dans l'art antérieur, à s'approcher au plus près de chacune des deux viroles, mais étant chacun seulement au contact de l'une et à distance de l'autre des deux viroles, les tolérances de fabrication de ces éléments peuvent être augmentées. Il en résulte avantageusement une réduction de coût importante.In addition, the first and second radiological protection elements are no longer intended, as in the prior art, to approach closer to each of the two ferrules, but each being only in contact with the one and remotely on the other of the two ferrules, the manufacturing tolerances of these elements can be increased. This advantageously results in a significant cost reduction.
Enfin, il est noté que l'effort de contact se produisant à l'interface des premier et second éléments superposés radialement est incliné par rapport à la direction longitudinale. L'intensité de ce contact ainsi que l'intensité de contact entre les éléments de protection radiologique et leur virole associée est donc dépendante de la position relative longitudinale entre les éléments. Par conséquent, lors de l'insertion de l'un des deux éléments de protection par glissement longitudinal entre sa virole associée et l'autre élément de protection, les contacts, une fois établis, ont une intensité qui augmente à mesure que l'on poursuit l'insertion, ce qui confère aux éléments un caractère auto-serrant entre les viroles. L'augmentation de l'intensité de ces contacts est avantageuse en ce sens qu'elle assure une meilleure conduction thermique. A cet égard, il est noté que l'un et/ou l'autre des éléments de protection radiologique peuvent être revêtus d'une couche conductrice de chaleur au niveau de l'interface de contact, afin d'améliorer encore davantage la conduction thermique entre ces éléments. Cette couche est de préférence de faible épaisseur, et déformable, par exemple réalisée en plomb ou dans l'un de ses alliages. Naturellement, cette solution de couche conductrice de chaleur peut également être adoptée au niveau des contacts entre les éléments de protection radiologique et les viroles.Finally, it is noted that the contact force occurring at the interface of the first and second superimposed elements radially is inclined relative to the longitudinal direction. The intensity of this contact as well as the intensity of contact between the radiological protection elements and their associated ferrule is therefore dependent on the longitudinal relative position between the elements. Consequently, when one of the two longitudinal sliding protection elements is inserted between its associated ferrule and the other protection element, the contacts, once established, have an intensity which increases as one continues the insertion, which gives the elements a self-tightening character between the ferrules. Increasing the intensity of these contacts is advantageous in that it provides better thermal conduction. In this regard, it is noted that one and / or the other of the radiological protection elements may be coated with a heat-conducting layer at the contact interface, so that to further improve the thermal conduction between these elements. This layer is preferably thin, and deformable, for example made of lead or in one of its alloys. Naturally, this heat conducting layer solution can also be adopted at the contacts between the radiological protection elements and the ferrules.
De préférence, ledit segment de droite incliné forme avec ledit axe longitudinal un angle (A) compris entre 1 et 10°.Preferably, said inclined line segment forms with said longitudinal axis an angle (A) of between 1 and 10 °.
L'interface ainsi inclinée permet un plaquage radial satisfaisant des éléments de protection radiologique contre leur virole associée, lorsque ceux-ci sont contraints longitudinalement.The interface thus inclined allows a satisfactory radial plating of the radiological protection elements against their associated ferrule, when they are forced longitudinally.
De préférence, ladite interface entre lesdits premier et second éléments est plane ou tronconique. Quoi qu'il en soit, sa nature surfacique confère une conductivité thermique globale satisfaisante au corps latéral de l'emballage.Preferably, said interface between said first and second elements is plane or frustoconical. In any case, its surface nature confers a satisfactory overall thermal conductivity to the lateral body of the package.
Dans le cas où elle est plane, elle prend de préférence, en coupe quelconque selon un plan orthogonal à l'axe longitudinal, la forme d'un segment de droite orthogonal à une droite radiale passant par son milieu. Dans l'autre cas où elle est tronconique, elle est préférentiellement coaxiale avec les viroles intérieure et extérieure. De préférence, la surface extérieure du premier élément en appui contre la virole extérieure est de section droite, ou encore plus préférentiellement en forme d'arc de cercle de diamètre identique à celui de la surface intérieure de la virole extérieure contre laquelle elle est en appui, et la surface intérieure du second élément en appui contre la virole intérieure est de section droite, ou encore plus préférentiellement en forme d'arc de cercle de diamètre identique à celui de la surface extérieure de la virole intérieure contre laquelle elle est en appui. Les sections en arcs de cercles sont préférées, surtout lorsqu'ils sont centrés sur l'axe longitudinal, car ils permettent ainsi l'obtention de contacts surfaciques entre les viroles et les éléments de protection radiologique.In the case where it is flat, it preferably takes, in any section along a plane orthogonal to the longitudinal axis, the shape of a line segment orthogonal to a radial line passing through its middle. In the other case where it is frustoconical, it is preferably coaxial with the inner and outer rings. Preferably, the outer surface of the first element bearing against the outer shell is of cross section, or even more preferably in the form of a circular arc of diameter identical to that of the inner surface of the outer shell against which it is supported , and the inner surface of the second element bearing against the inner ferrule is of cross section, or even more preferably in the form of a circular arc of diameter identical to that of the outer surface of the inner ferrule against which it is supported. The arcuate sections are preferred, especially when they are centered on the longitudinal axis, as they allow the obtaining of surface contacts between the ferrules and the radiological protection elements.
De préférence, chacun des premier et second éléments est maintenu seulement par contacts dans l'espace annulaire. Cela implique, en particulier, qu'aucun moyen de fixation additionnel n'est rapporté entre un élément de protection et sa virole associée, ni entre les deux éléments de protection superposés radialement. La conception permet donc à ces éléments de se maintenir mutuellement par contact, à l'aide également des viroles.Preferably, each of the first and second members is held only by contacts in the annular space. This implies, in particular, that no additional fastening means is reported between a protective element and its associated shell, or between the two radially superimposed protection elements. The design allows these elements to maintain each other by contact, also using ferrules.
Par ailleurs, lesdits premier et second éléments présentent une étendue circonférentielle identique ou différente.Furthermore, said first and second elements have an identical or different circumferential extent.
A titre d'exemple, l'emballage comprend une pluralité de premiers éléments métalliques de protection radiologique ainsi qu'une pluralité de seconds éléments métalliques de protection radiologique, chaque premier élément étant en appui radial uniquement sur l'un de ladite pluralité de seconds éléments, et inversement, chaque couple d'un premier et d'un second éléments présentant ici préférentiellement une étendue circonférentielle identique.By way of example, the package comprises a plurality of first radiological protection metal elements as well as a plurality of second radiological protection metal elements, each first element being supported radially solely on one of said plurality of second elements. , and conversely, each pair of first and second elements presenting here preferably an identical circumferential extent.
Enfin, l'invention a également pour objet un procédé de fabrication d'un emballage tel que décrit ci-dessus, dans lequel on met d'abord en place l'un desdits premier et second éléments dans l'espace annulaire, puis on insère longitudinalement l'autre desdits premier et second éléments entre sa virole associée et l'élément déjà mis en place.Finally, the subject of the invention is also a process for manufacturing a package as described above, in which first one of said first and second elements is placed in the annular space and then inserted longitudinally the other of said first and second elements between its associated ferrule and the element already in place.
D'autres avantages et caractéristiques de l'invention apparaîtront dans la description détaillée non limitative ci-dessous.Other advantages and features of the invention will become apparent in the detailed non-limiting description below.
Cette description sera faite au regard des dessins annexés parmi lesquels ;
- la
figure 1 représente une vue schématique d'un conteneur pour le transport et/ou entreposage d'assemblages de combustible nucléaire, comprenant un emballage selon un premier mode de réalisation préféré de la présente invention, uniquement représenté grossièrement ; - la
figure 2 représente une vue plus détaillée en coupe transversale d'une partie de l'emballage, prise le long de la ligne II-II de lafigure 1 ; - la
figure 3 représente une vue en coupe prise le long de la ligne III-III de lafigure 2 ; - la
figure 4 représente schématiquement une étape du procédé de fabrication de l'emballage montré sur les figures précédentes ; et - les
figures 5 et 6 représentent des vues similaires à celle de lafigure 2 , l'emballage se présentant sous la forme d'autres modes de réalisation préférés.
- the
figure 1 is a schematic view of a container for transporting and / or storing nuclear fuel assemblies, comprising a package according to a first preferred embodiment of the present invention, only shown roughly; - the
figure 2 is a more detailed cross-sectional view of a portion of the package, taken along line II-II of thefigure 1 ; - the
figure 3 represents a sectional view taken along line III-III of thefigure 2 ; - the
figure 4 schematically represents a step of the method of manufacturing the package shown in the preceding figures; and - the
Figures 5 and 6 represent views similar to that of thefigure 2 the package being in the form of other preferred embodiments.
Tout d'abord en référence à la
Le conteneur 1 comprend globalement un emballage 2 objet de la présente invention, à l'intérieur duquel se trouve un dispositif de rangement 4, également dénommé panier de rangement. Le dispositif 4 est prévu pour être placé dans une cavité de logement 6 de l'emballage 2, comme le montre schématiquement la
Dans toute la description, le terme « longitudinal » doit être compris comme parallèle à l'axe longitudinal 8 et à la direction longitudinale X de l'emballage, et le terme « circonférentiel » doit être compris comme orthogonal à ce même axe longitudinal 8, ainsi qu'à une direction transversale/radiale R de l'emballage.Throughout the description, the term "longitudinal" should be understood as parallel to the
De manière classique et à titre de rappel, il est noté que le dispositif de rangement 4 comprend une pluralité de logements adjacents disposés parallèlement à l'axe 8, ces derniers étant chacun apte à recevoir au moins un assemblage de combustible de section carrée ou rectangulaire, et de préférence un seul. Le conteneur 1 et ce dispositif 4 ont été montrés dans une position verticale de chargement/déchargement des assemblages de combustible, différente de la position horizontale/couchée habituellement adoptée durant le transport des assemblages.In a conventional manner and as a reminder, it is noted that the
De façon générale, l'emballage 2 dispose essentiellement d'un fond 10 sur lequel le dispositif 4 est destiné à reposer en position verticale, d'un couvercle 12, et d'un corps latéral 14 s'étendant autour et selon l'axe longitudinal 8, ce corps 14 définissant une ouverture d'emballage destinée à faire pénétrer le panier dans la cavité de logement 6, et à être ensuite obturée par le couvercle 12.In general, the
C'est donc ce corps latéral 14 qui définit la cavité de logement 6, à l'aide d'une surface intérieure latérale 16 de forme sensiblement cylindrique et de section circulaire, et d'axe confondu avec l'axe 8.It is therefore this
Le fond 10, qui définit le fond de la cavité 6 ouverte au niveau du couvercle 12, peut être réalisé d'une seule pièce avec une partie au moins du corps latéral 14, sans sortir du cadre de l'invention.The bottom 10, which defines the bottom of the
En référence à présent à la
Ce dispositif de protection 20 est en particulier conçu pour former une barrière contre les rayonnements gamma émis par les assemblages de combustible irradié logés dans la cavité 6. Ainsi, il est logé entre la virole interne 22 dont la surface intérieure correspond à la surface intérieure latérale 16 de la cavité 6, et la virole externe 24.This
Comme cela est visible sur la
Les premiers et seconds éléments 30, 32 sont métalliques, de préférence des blocs en plomb ou en fonte ou dans l'un de leurs alliages, ce type de matière permettant d'assurer à la fois une protection radiologique contre les rayonnements gamma, et une conductivité thermique satisfaisante. Les premiers et seconds éléments 30, 32 présentent une forme très proche, tout en étant positionnés de manière inversée selon la direction longitudinale, comme cela apparaitra clairement par la suite.The first and
Pour ce qui concerne chaque premier élément 30, sa surface extérieure est en appui, et plus préférentiellement en contact direct, contre la surface intérieure 24a de la virole extérieure 24. Ce contact est préférentiellement surfacique, sur toute la surface du bloc 30 qui se trouve en regard de la surface intérieure 24a. Pour ce faire, sa surface extérieure présente en section transversale une forme d'arc de cercle convexe de diamètre proche ou identique à celui de la surface intérieure 24a, et de même centre, même si une coupe droite pourrait être envisagée, sans sortir du cadre de l'invention.With regard to each
Par ailleurs, sa surface intérieure est à distance de la surface extérieure 22a de la virole intérieure 22, et au contact de la surface extérieure du second élément 32 qui lui est superposé radialement.Furthermore, its inner surface is spaced from the
Ce second élément 32 a sa surface intérieure en appui, et plus préférentiellement en contact direct, contre la surface extérieure 22a de la virole intérieure 22. Ce contact est préférentiellement surfacique, sur toute la surface du bloc 32 qui se trouve en regard de la surface extérieure 22a. Pour ce faire, sa surface extérieure présente ici, en section transversale, une forme d'arc de cercle concave de diamètre proche ou identique à celui de la surface extérieure 22a, et de même centre, même si une section droite pourrait également être envisagée.This
Dans ce premier mode de réalisation préféré, les deux éléments 30, 32 de chaque couple présentent une étendue circonférentielle identique, et se superposent parfaitement selon la direction radiale. En d'autres termes, chacun d'eux deux est uniquement en appui radial sur l'autre élément du couple, ce qui se traduit également par un même calage angulaire des deux éléments d'étendue circonférentielle identique.In this first preferred embodiment, the two
Les couples d'éléments 30, 32 qui se succèdent circonférentiellement peuvent également présenter des étendues circonférentielles identiques ou différentes.The circumferentially succeeding pairs of
Comme évoqué précédemment, la surface intérieure de chaque premier élément 30 et la surface extérieure du second élément 32 qui lui est associé sont en contact surfacique, au niveau d'une interface référencée 40 sur les figures. Cette interface est plane ou tronconique, c'est-à-dire, dans ce dernier cas, qu'elle prend la forme d'une portion angulaire d'une surface tronconique.As mentioned above, the inner surface of each
L'interface 40 présente, en coupe passant par tout plan longitudinal la traversant et intégrant l'axe 8, la forme d'un segment de droite incliné d'un angle A par rapport à une droite longitudinale 42 parallèle à la direction X. Cet angle A est préférentiellement faible, par exemple compris entre 1 et 10°, comme montré sur la
Par ailleurs, la
Avec une telle configuration, la chaleur dégagée par les assemblages est conduite de manière continue entre les deux viroles 22, 24, ce qui confère une conductivité thermique satisfaisante au corps latéral. Comme montré schématiquement par les flèches de la
Un des principaux avantages de cette solution réside dans l'obtention de chemins privilégiés continus de conduction thermique entre les deux viroles, avec des éléments 30, 32 de forme simple, chacun en contact avec seulement l'une de ces deux viroles.One of the main advantages of this solution lies in obtaining continuous privileged paths of thermal conduction between the two rings, with
Ici, chacun des éléments 30, 32 est donc maintenu uniquement par contacts dans l'espace annulaire 18, chacun d'eux étant plaqué contre l'une des viroles et contre l'élément de protection lui étant superposé radialement.Here, each of the
Pour assurer la fabrication de l'emballage, et plus particulièrement pour le montage de chaque couple d'éléments de protection radiologique, le second élément 32 est d'abord mis en place dans l'espace annulaire 18, contre la surface extérieure 22a de la virole 22. Sa partie effilée se trouve alors à proximité de l'ouverture de l'emballage, tandis que son autre extrémité, la plus épaisse, repose par exemple sur le fond de l'emballage.To ensure the manufacture of the packaging, and more particularly for mounting each pair of radiological protection elements, the
Ensuite, comme le montre schématiquement la
La poursuite du déplacement longitudinal du premier élément 30 par rapport à l'élément 32 conduit à accentuer l'intensité des contacts, et donc à renforcer la conductivité thermique.Continued longitudinal displacement of the
Il est noté qu'une configuration inversée pourrait être envisagée, dans laquelle le premier élément 30 serait mis en place avant le second, sans sortir du cadre de l'invention.It is noted that an inverted configuration could be envisaged, in which the first element would be put in place before the second, without departing from the scope of the invention.
De plus, il est indiqué que les couples d'éléments sont de préférence montés successivement, même s'il peut être envisagé de placer d'abord l'ensemble des seconds ou l'ensemble des premiers éléments de tous les couples, sur 360°, puis de glisser ensuite tous les autres éléments dans l'espace annulaire.In addition, it is stated that the pairs of elements are preferably mounted successively, although it may be considered to place first the set of the second or all of the first elements of all the couples, over 360 °, then slide all the other elements in the annular space.
Sur la
Enfin, la
Bien entendu, diverses modifications peuvent être apportées par l'homme du métier à l'invention qui vient d'être décrite, uniquement à titre d'exemples non limitatifs.Of course, various modifications may be made by those skilled in the art to the invention which has just been described, solely by way of non-limiting examples.
Claims (10)
caractérisé en ce que
characterized in that
caractérisé en ce que ledit segment de droite incliné (40) forme avec ledit axe longitudinal (8) un angle (A) compris entre 1 et 10°.Packaging according to claim 1,
characterized in that said inclined line segment (40) forms with said longitudinal axis (8) an angle (A) of between 1 and 10 °.
caractérisé en ce que ladite interface (40) est plane et prend, en coupe quelconque selon un plan orthogonal à l'axe longitudinal (8), la forme d'un segment de droite orthogonal à une droite radiale passant par son milieu.Packaging according to claim 3,
characterized in that said interface (40) is plane and takes, in any section along a plane orthogonal to the longitudinal axis (8), the shape of a line segment orthogonal to a radial line passing through its middle.
caractérisé en ce que ladite interface (40) est tronconique, et coaxiale avec les viroles intérieure et extérieure.Packaging according to claim 3,
characterized in that said interface (40) is frustoconical, and coaxial with the inner and outer ferrules.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0957930A FR2952468B1 (en) | 2009-11-10 | 2009-11-10 | PACKAGING FOR THE TRANSPORT AND / OR STORAGE OF RADIOACTIVE MATERIALS COMPRISING RADIALLY STACKED RADIOLOGICAL PROTECTION ELEMENTS |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2320429A1 true EP2320429A1 (en) | 2011-05-11 |
EP2320429B1 EP2320429B1 (en) | 2013-12-11 |
Family
ID=42194669
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10190308.6A Not-in-force EP2320429B1 (en) | 2009-11-10 | 2010-11-08 | Packaging for transporting and/or storing radioactive materials including radially stacked radiation protection elements |
Country Status (6)
Country | Link |
---|---|
US (1) | US9142327B2 (en) |
EP (1) | EP2320429B1 (en) |
JP (1) | JP5790984B2 (en) |
KR (1) | KR20110052489A (en) |
ES (1) | ES2452568T3 (en) |
FR (1) | FR2952468B1 (en) |
Cited By (1)
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CN105453186A (en) * | 2013-08-14 | 2016-03-30 | Tn国际公司 | Assembly comprising a package for transporting radioactive substances and a chassis for supporting the package |
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US9233776B2 (en) | 2012-06-07 | 2016-01-12 | Bayer Healthcare Llc | Molecular imaging vial transport container and fluid injection system interface |
WO2014052734A1 (en) | 2012-09-28 | 2014-04-03 | Mevion Medical Systems, Inc. | Controlling particle therapy |
US9757306B2 (en) | 2013-03-13 | 2017-09-12 | Bayer Healthcare Llc | Vial container with collar cap |
US9327886B2 (en) * | 2013-03-13 | 2016-05-03 | Bayer Healthcare Llc | Vial container with collar cap |
WO2015048468A1 (en) | 2013-09-27 | 2015-04-02 | Mevion Medical Systems, Inc. | Particle beam scanning |
US11549258B2 (en) * | 2019-08-08 | 2023-01-10 | Daniel John Shields | Radiation shielding structure |
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Also Published As
Publication number | Publication date |
---|---|
US20120007004A1 (en) | 2012-01-12 |
EP2320429B1 (en) | 2013-12-11 |
JP5790984B2 (en) | 2015-10-07 |
FR2952468B1 (en) | 2012-01-13 |
KR20110052489A (en) | 2011-05-18 |
ES2452568T3 (en) | 2014-04-02 |
JP2011102800A (en) | 2011-05-26 |
US9142327B2 (en) | 2015-09-22 |
FR2952468A1 (en) | 2011-05-13 |
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