EP2831888B1 - Method and mobile device for reducing the thermal resistance between two solids - Google Patents
Method and mobile device for reducing the thermal resistance between two solids Download PDFInfo
- Publication number
- EP2831888B1 EP2831888B1 EP13717200.3A EP13717200A EP2831888B1 EP 2831888 B1 EP2831888 B1 EP 2831888B1 EP 13717200 A EP13717200 A EP 13717200A EP 2831888 B1 EP2831888 B1 EP 2831888B1
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- European Patent Office
- Prior art keywords
- elements
- transmitter
- basket
- base
- traction
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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
- G21F5/012—Fuel element racks in the 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
- G21F5/10—Heat-removal systems, e.g. using circulating fluid or cooling fins
Definitions
- the invention relates to a storage basket for nuclear fuel assemblies consisting of a plurality of contiguous cells of great length in each of which can be introduced a fuel assembly or possibly the rods of several fuel assemblies.
- These storage baskets are intended for storage and / or transport of said fuel assemblies, possibly in shielded packaging or not. They are suitable for used fuel, but can also be used for new fuel. They can be used in a dry or wet environment, for example when storing fuels in swimming pools or when they are introduced in transport or storage containers.
- Stacking various materials is the solution provided to the needs of the various functions of a fuel assembly transport ship (radiation protection, impact resistance, fire ). In the case of high power to be discharged, a limit to the internal temperature results from the presence of games required for stacking.
- this system with interlockings of the different radial layers requires, in particular to introduce more easily an assembly or the basket in a castle, to provide games at the interfaces between the different layers, in particular between assembly and cavity but also between the basket and the ferrule.
- These sets for example about 5 mm and 2 mm, can be disadvantageous with respect to heat transfer requirements.
- the transport is under nitrogen but more conducive gases (helium) can be used, in this case, internal and external clearances, respectively 5 mm and 2 mm, are sufficient to transport PWR fuel (pressurized water reactor) since the powers are weak.
- helium helium
- internal and external clearances respectively 5 mm and 2 mm, are sufficient to transport PWR fuel (pressurized water reactor) since the powers are weak.
- the maximum power of an assembly transported under helium would be limited to 2.5 kW without exceeding 450 ° C and 4.5 kW without exceeding 650 ° C while the need for power transported could be much higher.
- the document WO 2011/161233 describes a system that reduces the thermal resistance of contact due to external games.
- the 4 parts of a basket come into contact with the steel ferrule.
- the result is a simple system, with improved radial transfers, but not so-called internal games.
- the gain, in terms of evacuable power, is therefore low.
- a problem is therefore to improve internal heat exchange in a transport cask in order to reduce the temperatures reached in nominal mode.
- Each transmitting element is made of a material which conducts heat, and therefore of good thermal conductivity, for example of a metallic material such as aluminum or copper.
- each of these lateral faces is provided with at least 2 studs or 2 studs.
- the means for providing traction of the element may comprise notches or lateral recesses made in the element, each recess opening into one of the secondary plane faces, and possibly in the corresponding lateral face.
- a wall of each notch comprises means, for example at least 2 studs or 2 studs.
- Such an element may comprise at least one pull rod, for example having a perforated interior, or not, and cooperating with the means to ensure traction of the element in a direction parallel to the base.
- Such an element may have, in a plane perpendicular to the base, a substantially triangular shape.
- the base may be flat, or have at least one curvature about an axis substantially parallel to the direction of traction.
- the stack of transmitter elements may have a height (h) less than the total height of the basket element.
- the rest of the basket consists of a transmitting material, stacked above and below the transmitting elements described above.
- the height h is then substantially equal to or close to the length over which the fuel elements produce heat.
- the basket element may further comprise at least a second stack of transmitter elements as described above, arranged in a zone separated from the first stack by a continuous portion of material. This second stack then plays a mechanical role, but a lower thermal role.
- An elementary nuclear fuel storage basket may comprise a plurality of storage basket elements of the type described above, arranged to delimit a substantially square central cavity or rectangular or hexagonal in a plane perpendicular to the direction of traction of each basket, according to the shape of the assembly for which it is intended.
- Such a method may be preceded by a step of introducing the storage basket into a pool, and followed by a step of extracting the basket loaded with the rods to bring it out of the pool.
- means are used to apply a force on a stack of transmitting elements, which allows the basket to modify its internal and external radii and thus reduce the spaces between assembly and basket and also between basket and the external environment, for example a ferrule.
- the basket adapts its shape and marries any deformation of the assembly.
- the invention therefore makes it possible to maintain significant play during the introduction of the load and then to resorb them before a subsequent operation, for example handling or transport.
- the invention described here allows, by the multiplicity of its basic surfaces to increase the number of contact points and to have larger contact areas.
- the invention makes it possible to minimize the internal and external clearances in a basket, which makes it possible to carry out the transport storage and transportation of certain assemblies, whose powers (P> 8kW) are greater than those currently generated. It also makes it possible to optimize the number of transport assemblies, since both a single assembly, a plurality of assembly, can be made.
- Figures 2A (seen from the side, in section according to plane AA 'or xOz of the Figure 2B) and 2B (seen from above, in section along the plane BB 'or xOy of the Figure 2A ) which represent a stack of transmitter elements 30, 32, 34, 36 of the heat of a basket system 20 according to a particular embodiment of the invention.
- the axis Ox is perpendicular to the two walls 22,24 while the axes Oz and Oy are parallel to them.
- the stack extends in a general direction according to Oz.
- Each element of the stack has a substantially prismatic shape, as illustrated in FIG. Figure 2C for an embodiment of an individual element 30.
- the other elements of the Figure 2A are identical or similar and, for that reason, all parts - similar or identical to those described in Figure 2C - these other elements are not described in detail.
- It comprises a base 305, which, in this embodiment, is flat and parallel to a stop 307 which extends along the axis Oy of the trirectangular trihedron Oxyz.
- the element is limited by two walls or side faces 301, 301 '.
- the latter two walls are substantially perpendicular to the base 305 and substantially parallel to the plane xOz.
- the side walls here: 341, 341 ', the element shown being the element 34
- the side walls are inclined and thus cut at the same time the axes Ox and Oy.
- each of these transmitter elements has a shape substantially triangular, each triangle having a large side and 2 small sides, which are preferably of substantially equal length, the triangle itself being substantially isosceles.
- the height of this triangle is smaller than the distance between the two walls 22, 24.
- the maximum distance between the top 307 of the element and its base 305 makes it possible to maintain a clearance 27, 29 between this element and each of the two walls 22, 24.
- the various elements 30, 32, 34, 36 are stacked as indicated on the Figure 2A , the lower (respectively upper) planar surface of a first element being in contact with or facing the upper (respectively lower) planar surface of a second element immediately adjacent to, but situated under (respectively) on this first element, according to the Oz axis.
- a transmitting element 30 has a base directed towards the wall 24 while the base of the neighboring elements is directed towards the wall 22.
- the faces 305, 325, etc. are flat.
- the cylindrical portion of the wall 345 ', 305' is tangential to the outer wall or to the outer plane 24.
- Such a curvature may be useful to conform to the shape of a cylinder, the plans or walls 22 and 24 are often cylindrical (see, for example, the structures of Figures 10b ) An axis parallel to the direction of traction.
- each of the lateral faces 301, 301 ', 321, 321', 341, 341 ', 361, 361' of each element may comprise two pins 30 ', 30 ", 32', 32", 34 ', 34 ", 36 36 ", each post being close to one of the lower and upper planar surfaces of the corresponding element.
- the two tenons of the same lateral face are substantially aligned in a direction parallel to the base of this same element or along the edge 305 in the sectional view of the 2D figure (or again: according to the direction of traction).
- Each post has a substantially cylindrical shape, the axis of the cylinder being directed substantially perpendicular to the side face on which the pin is located.
- a connecting rod or rod 40, 42, 44, 46 connects the two tenons closest to two neighboring elements. This link will define the maximum distance that can be between the two flat surfaces, lower and upper, the closest to two neighboring elements, when they are not in contact. It also defines the maximum amplitude of the possible sliding of a plane face of an element relative to the plane face opposite the neighboring element.
- a link has the shape represented in Figure 2A or 6A this shape is longitudinal and has a central opening, also longitudinal.
- the maximum amplitude of this opening that is to say the distance between the internal faces of the two short sides of the rod is equal to the maximum distance desired between the external generatrices of the two neighboring studs of two transmitter elements immediately adjacent in stacking.
- the link and its lateral opening allow 2 neighboring elements to slide on one another, keeping their immediate neighboring faces in contact.
- each of the rods has a central opening which allows the two adjacent elements 301 and 321, 321 and 341, 341 and 361 ... to be spaced apart so that their adjacent side faces remain parallel to each other with a distance e.
- each link 47 has two openings, each of these openings for accommodating a stud 30 ", 32" of one of the transmitter elements.
- One of these openings that which is around the tenon 30 ", allows the rod to move only in rotation around this tenon, but not in translation, while the other opening allows it to move in rotation around 32 "and allows the element 32 to move in translation: the corresponding opening extends over a greater length, approximately from the middle of the link (in the direction of its length) to the inner side from one of its lateral ends.
- each lateral notch In the inner wall of each lateral notch is here made a hole 203 ', 204' in which can be positioned a pin, intended to cooperate with the end of a rod or a rod, as already described above .
- each notch is therefore intended to be provided with means, for example at least 1 stud or 1 pin, to couple each element using, for example, two rods, as explained above.
- Each notch has a volume sufficient to accommodate an end portion of the corresponding link.
- means or a traction mechanism 21 are positioned on one side of the basket, at the top or bottom thereof.
- Means comprising for example one or more rods 210 and / or one or more jacks are connected to the end element of the stack of elements to communicate to all the elements upward or downward movement along the axis oz.
- the means 21 may allow to exert pressure on the entire stack, when the latter is in the closed or lowered position.
- each transmitting element extends over a limited length L, for example between 100 mm and 200 mm or 500 mm, this length being chosen as a function of the surface qualities of the elements and the quality of the desired heat transfer.
- L may be the extended length of an arc, especially in the case of a base such as the base 345 'of the figure 3B .
- an assembly which generally has a cylindrical shape, will be surrounded by a plurality of n basket members, arranged substantially circularly, each basket member covering an area of about 360 ° / n.
- n basket members arranged substantially circularly, each basket member covering an area of about 360 ° / n.
- Figures 8A and 8B for a hexagonal assembly, each basket member 60, 62, 64, 66, 68, 70 covering a sector of about 60 °.
- References 620-626 are the individual elements of two basket members 62. The two end members 620 and 626 are truncated to provide planar surfaces at both ends of the stack.
- FIGS. 8A and 8B the three-dimensional system is shown, with a vertical array of transmitter elements removed (or a basket element removed) for better viewing.
- the set of basket elements is arranged to define an internal hexagonal opening at 17, in which a fuel element can be introduced.
- the figure 8A corresponds to an opening situation, the transmitting elements being in disjointed position from one another, as illustrated in FIG. Figure 2A and in Figure 4A .
- a game, which can be important, is then created between the load, which is in the center of the basket, and the inner wall of this basket.
- the Figure 8B corresponds to a closing situation, the neighboring transmitting elements being in a position of contact with each other, as illustrated in FIG. figure 4C and in Figure 6B . In this position, any play, which was previously between the load and the inner surface of the basket, is canceled.
- the hexagon 15 is the load, its outer wall corresponds to the hot wall (walls 22) of the Figure 2A .
- the basket thus formed is disposed inside a castle, the assembly being surrounded by a shell 54 of steel and a layer 52 of resin.
- the assembly may be provided with vanes 56 for the removal of heat; these are the fins which, in FIG. 10C, protrude outwards.
- These references 52, 54 are found on the figure 10A , for the case of a single basket.
- a constituent assembly of a castle may therefore comprise at least one elementary basket as described above, but also a set of absorbent layers, for example a layer 54 (which may be forged steel or lead) to absorb the gamma radiation, and a layer 52 (containing a lot of hydrogen) to slow the neutrons.
- a layer 54 which may be forged steel or lead
- a layer 52 containing a lot of hydrogen
- An elementary basket may have the structure that has just been described above, over its entire height.
- some elements can be arranged in a part in which there is no or little heat exchange, as in the zones 200, 200 '.
- These elements work as has been described above, but they have only a role of mechanical blocking, and not, or little, role from the thermal point of view.
- the set of moving elements has both a thermal and mechanical role.
- the zones 200 ', 200 are separated from the zone or the portion 20 by a portion of homogeneous and continuous material, not provided with transmitting elements as described above.
- FIGS. 9A - 9E represent the steps of a fuel loading in a device according to the invention.
- this assembly which does not yet contain a fuel element, is immersed in a pool 120 and the covers 130 of the different parts are open.
- the set can then be lifted from the pool for draining.
- the power per assembly ranges from 4.6kW (TC12) to 6.3kW (TC1) for standard sets. Cancel these games would get respectively 6.6kW to 8.8kW.
- the geometry chosen for the castle is a multi layer geometry, represented in top view in figure 10B .
- the outer diameter of the layer 550 is the same as that of the basket used today. which does not change the rest of the geometry.
- Reference 54 designates a steel ferrule, represented in plan view in figure 10A .
- the outside diameter De of the layer 52 of resin, and the outside diameter of the basket 100 of aluminum are preserved
- the external resin reaches a temperature of 80 ° C.
- the invention applies in the field of storage and / or transport of high power radioactive materials, especially high-power generation IV fuels, for example still assemblies loaded with minor actinides.
Description
L'invention concerne un panier de rangement pour assemblages combustibles nucléaires constitué d'une pluralité d'alvéoles contiguës de grande longueur dans chacune desquelles peut être introduit un assemblage combustible ou éventuellement les crayons de plusieurs assemblages combustibles.The invention relates to a storage basket for nuclear fuel assemblies consisting of a plurality of contiguous cells of great length in each of which can be introduced a fuel assembly or possibly the rods of several fuel assemblies.
Ces paniers de rangement (que l'on appelle également casiers ou « racks ») sont destinés au stockage et/ou au transport desdits assemblages combustibles, éventuellement en emballages blindés ou non. Ils sont adaptés pour le combustible irradié, mais sont aussi utilisables pour du combustible neuf. Ils peuvent être utilisés en milieu sec ou humide, par exemple lors du stockage des combustibles en piscine ou lors de leur introduction dans des emballages de transport ou stockage.These storage baskets (also called bins or "racks") are intended for storage and / or transport of said fuel assemblies, possibly in shielded packaging or not. They are suitable for used fuel, but can also be used for new fuel. They can be used in a dry or wet environment, for example when storing fuels in swimming pools or when they are introduced in transport or storage containers.
L'empilement de divers matériaux est la solution apportée au besoin des différentes fonctions d'un château de transport d'assemblages combustibles (radioprotection, tenue aux chocs, aux feux...). Dans le cas de forte puissance à évacuer, une limite à la température interne résulte de la présence de jeux nécessaires à l'empilement.Stacking various materials is the solution provided to the needs of the various functions of a fuel assembly transport ship (radiation protection, impact resistance, fire ...). In the case of high power to be discharged, a limit to the internal temperature results from the presence of games required for stacking.
Les problématiques liées à la sûreté et aux transports de matières radioactives sont exposées dans les documents
En général, les assemblages combustibles sont véhiculés à sec dans des châteaux contenant jusqu'à 12 assemblages (ou plus). Ces emballages de transport ont été agréés par les autorités compétentes françaises, britanniques et japonaises et répondent aux critères imposés par la réglementation AIEA pour les emballages de Type B. Ce type de château, utilisé depuis près de 40 ans, repose sur le principe des performances intrinsèque au colis (double barrière, tenue au feu...) qui empêche tout rejet de radioactivité.In general, fuel assemblies are transported dry in castles containing up to 12 (or more) assemblies. These transport packagings have been approved by the competent French, British and Japanese authorities and meet the criteria imposed by the IAEA regulations for type packagings. B. This type of castle, used for nearly 40 years, is based on the intrinsic performance principle of the package (double barrier, fire resistance ...) that prevents any release of radioactivity.
Comme illustré en
- une zone externe 2, qui peut être munie d'ailettes 4 de refroidissement,
- une
couche 6 absorbant les neutrons, - une
virole 8 en acier, - et un
panier 10 de rangement pour assemblages combustibles nucléaires, comportant une ou plusieurs alvéoles contigües 12, de grande longueur, dans lesquelles peut être introduit un assemblage combustible ou éventuellement les crayons de plusieurs assemblages combustibles.
- an
external zone 2, which can be provided withcooling fins 4, - a
layer 6 absorbing neutrons, - a
ferrule 8 made of steel, - and a
storage basket 10 for nuclear fuel assemblies, comprising one or morecontiguous cells 12, of great length, in which can be introduced a fuel assembly or possibly the rods of several fuel assemblies.
On connait divers types de paniers à structure alvéolaire pour assemblages combustibles nucléaires. Ils assurent en général trois fonctions :
- le contrôle de la criticité, à sec ou en présence d'eau, à l'état liquide ou gazeux (cette eau pouvant contenir des composés neutrophages, à base de bore par exemple), de l'ensemble des assemblages qui y sont rangés,
- une résistance mécanique suffisante qui répond à deux objectifs : (i) assurer le maintien de la géométrie du panier chargé d'assemblages et éviter la détérioration des crayons combustibles lors des utilisations normales (manutention, transport...), (ii) assurer le contrôle de la criticité par maintien de la géométrie du panier même en conditions accidentelles (choc et chute importants) selon les réglementations en vigueur,
- le transfert thermique, pour évacuer la chaleur dégagée dans le cas des assemblages irradiés.
- the control of criticality, dry or in the presence of water, in the liquid or gaseous state (this water may contain neutron-containing compounds, boron-based, for example), of all the assemblies stored therein,
- a sufficient mechanical strength that serves two purposes: (i) maintain the geometry of the basket loaded with assemblies and avoid the deterioration of the fuel rods during normal use (handling, transport ...), (ii) ensure the criticality control by maintaining the geometry of the basket even under accident conditions (high shock and drop) according to the regulations in force,
- heat transfer, to evacuate the heat released in the case of irradiated assemblies.
Les paniers sont parfois conçus également en vue d'apporter un complément de blindage contre les radiations.The baskets are sometimes also designed to provide additional shielding against radiation.
Le panier est généralement constitué d'une association de plusieurs matériaux, chacun d'eux remplissant au moins une des trois fonctions citées ci-dessus. Les principaux matériaux utilisés sont, en général :
- l'acier inox ou l'aluminium (ou ses alliages) pour la fonction de résistance mécanique,
- l'aluminium ou le cuivre (ou leurs alliages) pour la fonction de transfert thermique,
- les composés au bore (comme les frittés à base de B4C), les alliages de cuivre, d'aluminium ou d'acier inox contenant du bore pour la fonction de contrôle de la criticité.
- stainless steel or aluminum (or its alloys) for the mechanical strength function,
- aluminum or copper (or their alloys) for the heat transfer function,
- boron compounds (such as B4C-based sintered alloys), boron-containing alloys of copper, aluminum or stainless steel for the criticality control function.
Du point de vue des performances thermiques d'un château, l'évacuation de la puissance interne et la résistance à un feu de 800°C pendant 30 mn est actuellement résolue en jouant sur les matériaux (virole en acier, panier en aluminium...) et leur performance (« compound » traversé par des ailettes, protection des joints...).From the point of view of the thermal performance of a castle, the evacuation of the internal power and the fire resistance of 800 ° C for 30 minutes is currently solved by playing on the materials (steel ferrule, aluminum basket. .) and their performance ("compound" crossed by fins, protection of joints ...).
Pour une question de réalisation et surtout de montage, ce système avec des emboitements des différentes couches radiales nécessite, notamment pour introduire plus aisément un assemblage ou le panier dans un château, de ménager des jeux au niveau des interfaces entre les différentes couches, en particulier entre assemblage et cavité mais aussi entre le panier et la virole. Ces jeux, par exemple d'environ 5 mm et 2 mm, peuvent être pénalisants au regard des besoins en transfert thermique.For a question of realization and especially of assembly, this system with interlockings of the different radial layers requires, in particular to introduce more easily an assembly or the basket in a castle, to provide games at the interfaces between the different layers, in particular between assembly and cavity but also between the basket and the ferrule. These sets, for example about 5 mm and 2 mm, can be disadvantageous with respect to heat transfer requirements.
En particulier, dans le cas de forte puissance à évacuer, la présence de ces jeux engendre de fortes résistances thermiques, donc de forts gradients thermiques, ce qui augmente fortement la température maximale interne lorsqu'on souhaite accroître les puissances maximales admissibles (qui dépendent aussi des matériaux, du taux de combustion...).In particular, in the case of high power to be evacuated, the presence of these games generates high thermal resistances, and therefore high thermal gradients, which greatly increases the maximum internal temperature when it is desired to increase the maximum allowable powers (which also depend on materials, burning rate ...).
Actuellement, le transport se fait sous azote mais des gaz plus conducteurs (hélium) peuvent être utilisés, dans ce cas, des jeux interne et externe, respectivement de 5 mm et 2 mm, suffisent pour transporter du combustible REP (réacteur à eau pressurisée) puisque les puissances sont faibles.Currently, the transport is under nitrogen but more conducive gases (helium) can be used, in this case, internal and external clearances, respectively 5 mm and 2 mm, are sufficient to transport PWR fuel (pressurized water reactor) since the powers are weak.
Mais il se pose le problème de pouvoir transporter des combustibles de plus forte puissance (par exemple de type combustible MOX ou bien des assemblages avec actinides dans le futur).But there is the problem of being able to transport higher power fuels (for example of the MOX fuel type or assemblies with actinides in the future).
La possibilité d'une bonne évacuation des calories vers l'extérieur, sans dépasser des températures internes rédhibitoires, est donc un problème clé pour l'avenir.The possibility of a good evacuation of calories to the outside, without exceeding prohibitive internal temperatures, is therefore a key problem for the future.
Dans ce cas, ce n'est pas tant la puissance totale transportée qui pose problème, mais plutôt le gradient thermique qui est créé par la présence des jeux mentionnés ci-dessus.In this case, it is not so much the total power transported that poses a problem, but rather the thermal gradient that is created by the presence of the games mentioned above.
Ainsi en utilisant la technologie actuelle, la puissance maximale d'un assemblage transporté sous hélium serait limitée à 2.5 kW sans dépasser 450°C et 4.5 kW sans dépasser 650°C alors que le besoin en puissance transportée pourrait être bien supérieur.Thus using current technology, the maximum power of an assembly transported under helium would be limited to 2.5 kW without exceeding 450 ° C and 4.5 kW without exceeding 650 ° C while the need for power transported could be much higher.
Le document
Le document
Il se pose donc également le problème des jeux dits internes (entre assemblage et panier).There is also the problem of so-called internal games (between assembly and basket).
En effet, si on reprend le cas du château à un assemblage sous hélium, avec des jeux classiques (par exemple 5 mm en interne et 2 mm en externe) la puissance évacuable à 650°C est de 6.3 kW. Si on annule le jeu externe, par exemple selon l'enseignement du document
Par conséquent, les jeux internes à un château de stockage ou de transport, dont les épaisseurs des jeux créent une résistance de contact importante, ainsi que les critères thermiques à ne pas dépasser, conditionnent grandement la puissance évacuable lors d'un transportd'assemblages combustibles.Therefore, the internal games at a storage or transport castle, whose game thicknesses create a significant contact resistance, as well as that the thermal criteria not to be exceeded greatly affect the evacuable power during a transport of fuel assemblies.
Un problème est donc d'améliorer les échanges thermiques internes à un château de transport afin de diminuer les températures atteintes en régime nominal.A problem is therefore to improve internal heat exchange in a transport cask in order to reduce the temperatures reached in nominal mode.
On apporte ici une solution à cette limitation.Here is a solution to this limitation.
On décrit d'abord un élément transmetteur de la chaleur pour un panier de rangement de combustible nucléaire, de forme sensiblement prismatique, comportant 3 faces principales, dont une base et 2 surfaces planes secondaires, et deux faces latérales, en un matériau transmettant la chaleur, muni latéralement de moyens pour assurer une traction de l'élément selon une direction parallèle à la base.First described is a heat-transmitting element for a substantially prismatic nuclear fuel storage basket having 3 main faces, including a base and 2 secondary flat surfaces, and two side faces, of a heat-transmitting material. , laterally provided with means for ensuring traction of the element in a direction parallel to the base.
Chaque élément transmetteur est en un matériau qui conduit la chaleur, donc de bonne conductivité thermique, par exemple en un matériau métallique tel que de l'aluminium ou du cuivre.Each transmitting element is made of a material which conducts heat, and therefore of good thermal conductivity, for example of a metallic material such as aluminum or copper.
Les moyens pour assurer une traction de l'élément peuvent être placés sur les faces latérales. Par exemple chacune de ces faces latérales est munie d'au moins 2 plots ou 2 tenons.The means for ensuring traction of the element can be placed on the lateral faces. For example, each of these lateral faces is provided with at least 2 studs or 2 studs.
En variante les moyens pour assurer une traction de l'élément peuvent comporter des encoches ou des évidements latéraux pratiqués dans l'élément, chaque évidement débouchant dans une des faces planes secondaires, et éventuellement dans la face latérale correspondante. Une paroi de chaque encoche comporte des moyens, par exemple d'au moins 2 plots ou 2 tenons.Alternatively the means for providing traction of the element may comprise notches or lateral recesses made in the element, each recess opening into one of the secondary plane faces, and possibly in the corresponding lateral face. A wall of each notch comprises means, for example at least 2 studs or 2 studs.
Un tel élément peut comporter au moins une biellette de traction, par exemple ayant un intérieur ajouré, ou pas, et coopérant avec les moyens pour assurer une traction de l'élément selon une direction parallèle à la base.Such an element may comprise at least one pull rod, for example having a perforated interior, or not, and cooperating with the means to ensure traction of the element in a direction parallel to the base.
Un tel élément peut avoir, dans un plan perpendiculaire à la base, une forme sensiblement triangulaire.Such an element may have, in a plane perpendicular to the base, a substantially triangular shape.
La base peut être plane, ou avoir au moins une courbure autour d'un axe sensiblement parallèle à la direction de traction.The base may be flat, or have at least one curvature about an axis substantially parallel to the direction of traction.
Un élément de panier de rangement de combustible nucléaire, peut donc comporter :
- un premier empilement d'éléments transmetteurs du type décrit ci-dessus, chaque surface plane secondaire d'un élément étant en regard d'une surface plane secondaire d'un élément transmetteur voisin, de sorte que les bases des différents éléments transmetteurs sont alternativement tournées vers un côté de l'empilement puis vers l'autre, chaque élément transmetteur étant connecté à ses voisins par les moyens pour assurer une traction de l'élément selon une direction parallèle à la base,
- des moyens pour exercer une traction sur l'ensemble des éléments transmetteurs.
- a first stack of transmitter elements of the type described above, each secondary plane surface of an element facing a secondary planar surface of a neighboring transmitter element, so that the bases of the different transmitter elements are alternately rotated to one side of the stack and then to the other, each transmitting element being connected to its neighbors by the means to ensure traction of the element in a direction parallel to the base,
- means for exerting traction on all the transmitting elements.
Dans un tel élément de panier de rangement, chaque surface plane secondaire d'un élément peut :
- être en contact avec une surface plane secondaire d'un élément transmetteur voisin lorsqu'aucune traction n'est exercée sur l'ensemble des éléments transmetteurs, notamment lorsqu'une pression est exercée sur l'ensemble des éléments,
- et être éloignée, de la surface plane secondaire d'un élément transmetteur voisin, lorsqu'une traction est exercée sur l'ensemble des éléments transmetteurs.
- being in contact with a secondary plane surface of a neighboring transmitter element when no traction is exerted on all the transmitting elements, in particular when pressure is exerted on all the elements,
- and being away from the secondary planar surface of a neighboring transmitter element when traction is exerted on all the transmitter elements.
L'empilement d'éléments transmetteurs peut avoir une hauteur (h) inférieure à la hauteur totale de l'élément de panier. Dans ce cas, le reste du panier est constitué d'un matériau transmetteur, empilé au-dessus et au-dessous des éléments transmetteurs décrits ci-dessus. La hauteur h est alors sensiblement égale ou voisine de la longueur sur laquelle les éléments combustibles produisent de la chaleur.The stack of transmitter elements may have a height (h) less than the total height of the basket element. In this case, the rest of the basket consists of a transmitting material, stacked above and below the transmitting elements described above. The height h is then substantially equal to or close to the length over which the fuel elements produce heat.
L'élément de panier peut comporter en outre au moins un deuxième empilement d'éléments transmetteurs tels que décrit ci-dessus, disposés dans une zone séparée du premier empilement par une portion continue de matériau. Ce deuxième empilement joue alors rôle mécanique, mais un rôle thermique moindre.The basket element may further comprise at least a second stack of transmitter elements as described above, arranged in a zone separated from the first stack by a continuous portion of material. This second stack then plays a mechanical role, but a lower thermal role.
Un panier élémentaire de rangement de combustible nucléaire peut comporter une pluralité d'éléments de panier de rangement de type décrit ci-dessus, disposés de manière à délimiter une cavité centrale de forme sensiblement carrée ou rectangulaire ou hexagonale dans un plan perpendiculaire à la direction de traction de chaque panier, selon la forme de l'assemblage auquel il est destiné.An elementary nuclear fuel storage basket may comprise a plurality of storage basket elements of the type described above, arranged to delimit a substantially square central cavity or rectangular or hexagonal in a plane perpendicular to the direction of traction of each basket, according to the shape of the assembly for which it is intended.
On peut donc constituer un château pour le stockage et/ou le transport de combustible nucléaire, comportant un panier élémentaire de rangement, du type tel que décrit précédemment, le panier étant entouré(s) d'une couche de protection périphérique pour l'absorption des rayons gamma et une couche de protection périphérique pour ralentir les neutrons.It is therefore possible to constitute a castle for storing and / or transporting nuclear fuel, comprising an elementary storage basket of the type as described above, the basket being surrounded by a peripheral protection layer for absorption. gamma rays and a peripheral protection layer to slow down the neutrons.
On peut également constituer un château pour le stockage et/ou le transport de combustible nucléaire, comportant plusieurs paniers élémentaires de rangement, par exemple en nombre compris entre 2 et 12, chaque panier élémentaire étant du type tel que décrit précédemment.It can also constitute a castle for storing and / or transporting nuclear fuel, comprising several basic storage baskets, for example in number between 2 and 12, each elementary basket being of the type as described above.
Les paniers élémentaires sont placés dans un panier fixe lui-même ceinturé par une pluralité d'éléments transmetteurs du type précédent qui assurent un contact thermique efficace avec les couches périphériquesThe elementary baskets are placed in a fixed basket itself surrounded by a plurality of transmitting elements of the preceding type which ensure an effective thermal contact with the peripheral layers
Est également ici concerné un procédé de stockage et/ou de transport de crayon de combustible nucléaire, comportant les étapes suivantes:
- exercer une traction sur les éléments de panier d'un panier de rangement tel que décrit ci-dessus, de manière à les amener depuis une position initiale à une position soulevée et à engendrer un jeu entre chaque élément transmetteur et chacune des parois chaude et froide,
- introduire un ou plusieurs assemblages dans la cavité centrale,
- relâcher la traction, pour ramener les éléments transmetteurs dans la position initiale, dans laquelle la base de chaque élément transmetteur est positionnée en contact avec l'une ou l'autre des parois chaude et froide. Lors de cette étape, l'effet de la gravitation peut suffire pour ramener les éléments dans la position initiale, du fait de leur propre poids. On peut éventuellement ajouter une pression supplémentaire, ce qui permet de maintenir les éléments dans cette position même lorsque le panier est dans une position autre que la position verticale, par exemple lorsqu'il est en position horizontale lors d'un transport.
- pulling on the basket elements of a storage basket as described above, so as to bring them from an initial position to a raised position and to generate a clearance between each transmitter element and each of the hot and cold walls ,
- introduce one or more assemblies in the central cavity,
- releasing the tension, to bring the transmitting elements back to the initial position, in which the base of each transmitter element is positioned in contact with one or the other of the hot and cold walls. During this step, the effect of gravitation can be enough to bring the elements back to the initial position, because of their own weight. It may optionally add additional pressure, which keeps the elements in this position even when the basket is in a position other than the vertical position, for example when in a horizontal position during transport.
Un tel procédé peut être précédé d'une étape d'introduction du panier de rangement dans une piscine, et suivi d'une étape d'extraction du panier chargé avec les crayons pour l'amener hors de la piscine.Such a method may be preceded by a step of introducing the storage basket into a pool, and followed by a step of extracting the basket loaded with the rods to bring it out of the pool.
Dans l'invention, on met en oeuvre des moyens pour appliquer une force sur un empilement d'éléments transmetteurs, ce qui permet au panier de modifier ses rayons internes et externes et ainsi de réduire les espaces entre assemblage et panier et aussi entre panier et l'environnement extérieur, par exemple une virole.In the invention, means are used to apply a force on a stack of transmitting elements, which allows the basket to modify its internal and external radii and thus reduce the spaces between assembly and basket and also between basket and the external environment, for example a ferrule.
Ainsi le panier adapte sa forme et épouse d'éventuelles déformations de l'assemblage.Thus the basket adapts its shape and marries any deformation of the assembly.
L'invention permet donc de conserver des jeux importants lors de l'introduction de la charge puis de les résorber avant une opération ultérieure, par exemple une manutention ou un transport.The invention therefore makes it possible to maintain significant play during the introduction of the load and then to resorb them before a subsequent operation, for example handling or transport.
Dans le cas du transport d'assemblages, et en particulier de fortes puissances, le système permet de réduire, et même d'annuler, les résistances thermiques de contact (directement liées au gap de gaz dans les jeux et à la conductibilité thermique du gaz). Mais il présente d'autres avantages :
- le placage du panier sur l'assemblage permet une tenue mécanique pendant le transport ; on n'a alors plus besoin d'introduire des cales comme c'était le cas auparavant,
- ce panier va adapter sa forme et épouser d'éventuelles déformations longitudinales de l'assemblage,
- il réduit les coûts d'usinage actuels du panier,
- dans certains cas (notamment celui d'un assemblage dans un étui, on pourrait remplacer l'hélium du panier par de l'air sec ou de l'azote.
- the veneer of the basket on the assembly allows a mechanical strength during transport; then we do not need to introduce shims as was the case before,
- this basket will adapt its shape and marry any longitudinal deformation of the assembly,
- it reduces the current machining costs of the basket,
- in some cases (especially that of an assembly in a case, one could replace the helium of the basket by dry air or nitrogen.
Par rapport à la technique décrite dans le document
L'invention permet de minimiser les jeux internes et externes dans un panier, ce qui permet de réaliser le stockage et le transport en transport de certains assemblages, dont les puissances (P>8kW) sont supérieures à celles dégagées actuellement. Elle permet également d'optimiser le nombre de transport des assemblages, puisque que aussi bien un assemblage unique, qu'une pluralité d'assemblage, peuvent être réalisés.The invention makes it possible to minimize the internal and external clearances in a basket, which makes it possible to carry out the transport storage and transportation of certain assemblies, whose powers (P> 8kW) are greater than those currently generated. It also makes it possible to optimize the number of transport assemblies, since both a single assembly, a plurality of assembly, can be made.
On décrira à présent, à titre d'exemples non limitatifs, des modes de réalisation de l'invention, en se référant aux dessins annexés, dans lesquels :
- la
figure 1 , déjà décrite, est une vue éclatée d'un château de structure connue, - les
figures 2A-2D et 3A-3B sont diverses vues d'éléments transmetteurs tels que décrits, - les
figures 4A- 4C représentent 2 éléments liés par une biellette et leur mouvement relatif, - les
figures 5A-5D sont diverses vues d'éléments transmetteurs, - les
figures 6A et 6B représentent un empilement d'éléments transmetteurs, liés par des biellettes et leur mouvement relatif, - les
figures 7A et 7B sont des vues schématiques, respectivement d'un panier en position d'ouverture et d'un panier en position de fermeture, - les
figures 8A et 8B sont des vues d'un panier contenant un assemblage, - les
figures 9A-9E sont des étapes d'introduction d'un assemblage dans un panier, - les
figures 10A et 10B sont des vues de dessus de 2 systèmes, dont l'un contenant plusieurs assemblages, chacun de ces systèmes comportant au moins un panier, une virole en acier et une résine, - les
figures 11 ,respectivement 12 et 13, représentent l'évolution de la température maximale possible en fonction des jeux internes et externes et de la puissance d'un assemblage, pour 1 assemblage,respectivement 7 et 12 assemblages.
- the
figure 1 , already described, is an exploded view of a castle of known structure, - the
Figures 2A-2D and 3A-3B are various views of transmitter elements as described, - the
Figures 4A-4C represent 2 elements linked by a rod and their relative movement, - the
Figures 5A-5D are various views of transmitter elements, - the
Figures 6A and 6B represent a stack of transmitting elements, linked by rods and their relative movement, - the
Figures 7A and 7B are schematic views, respectively of a basket in the open position and a basket in the closed position, - the
Figures 8A and 8B are views of a basket containing an assembly, - the
Figures 9A-9E are steps of introducing an assembly into a basket, - the
Figures 10A and 10B are views from above of two systems, one of which contains several assemblies, each of these systems comprising at least one basket, a steel ferrule and a resin, - the
figures 11 , respectively 12 and 13, represent the evolution of the maximum possible temperature as a function of the internal and external clearances and the power of an assembly, for 1 assembly, respectively 7 and 12 assemblies.
On se réfère d'abord aux
Sur la
L'axe Ox est perpendiculaire aux 2 parois 22,24 tandis que les axes Oz et Oy leur sont parallèles. L'empilement s'étend selon une direction générale selon Oz.The axis Ox is perpendicular to the two
Chaque élément de l'empilement a une forme sensiblement prismatique, comme illustré en
Plus spécifiquement, l'élément représenté en
Il comporte une base 305, qui, dans ce mode de réalisation, est plane et parallèle à une arrête 307 qui s'étend selon l'axe Oy du trièdre trirectangle Oxyz.It comprises a
Selon un aspect particulier, illustré en
Entre l'arrête 307, ou le sommet, et la base 305 s'étendent 2 surfaces 303, 303' que l'on pourra désigner, par commodité, respectivement par « surface supérieure » et « surface inférieure». Dans l'exemple représenté, ces surfaces sont planes, mais elles peuvent avoir d'autres formes, par exemple elles peuvent comporter des corrugations ou des ondulations, destinées à venir en contact, ou à s'assembler, avec des corrugations ou des ondulations correspondantes d'une surface plane d'un élément voisin.Between the
Latéralement, selon l'axe Oy, l'élément est limité par deux parois ou faces latérales 301, 301'. Dans cet exemple de réalisation, ces deux dernières parois sont sensiblement perpendiculaires à la base 305 et sensiblement parallèles au plan xOz. Dans une variante, représentée schématiquement en vue de dessus en
La hauteur de ce triangle, ou la distance entre l'arrête 307 ou le sommet et la base 305, est inférieur à l'écart entre les deux parois 22, 24. Ainsi, lorsque l'élément est positionné comme illustré en
Sur la
Les divers éléments 30, 32, 34, 36 sont empilés comme indiqué sur la
Les grands côtés des éléments empilés sont disposés, alternativement, vers la paroi 24 et vers la paroi 22. Autrement dit, un élément transmetteur 30 a une base dirigée vers la paroi 24 tandis que la base des éléments voisins est dirigée vers la paroi 22.The long sides of the stacked elements are arranged, alternately, towards the
En position fermée ou abaissée de l'empilement, deux éléments voisins peuvent s'appuyer l'un contre l'autre par l'une de leurs surfaces planes inférieure et supérieure, selon une interface 40. Celle-ci a la forme d'un segment de droite qui définit, avec une droite parallèle à l'axe Ox, ou perpendiculaire aux parois 22, 24, un angle aigu A (par exemple compris entre 30° et 60°, par exemple encore égal à, ou voisin de, 45°).In the closed or lowered position of the stack, two adjacent elements can be supported against one another by one of their lower and upper flat surfaces, according to an
Dans l'exemple décrit ci-dessus, les faces 305, 325, etc sont planes.In the example described above, the
En variante, cette face peut présenter une courbure, par exemple elle peut consister en une portion de cylindre, comme illustré en
Comme on le voit également sur les
Une bielle ou biellette 40, 42, 44, 46 relie les deux tenons les plus proches de deux éléments voisins. Cette biellette va donc définir l'écart maximum qu'il peut y avoir entre les deux surfaces planes, inférieure et supérieure, les plus proches de deux éléments voisins, lorsque ceux-ci ne sont pas en contact. Elle définit également l'amplitude maximum du glissement possible d'une face plane d'un élément par rapport à la face plane en regard de l'élément voisin.A connecting rod or
Ces biellettes, et les tenons correspondants, permettent d'appliquer à l'élément concerné une traction selon une direction parallèle, ou sensiblement parallèle, à l'axe Oz et/ou à l'intersection 305 de la base avec le plan zOx (cas des
On peut ainsi assurer le déplacement relatif des éléments constitutifs du panier, lorsque ceux-ci sont empilés et disposés entre les deux parois telles que les parois chaude et froide 22, 24.It is thus possible to ensure the relative displacement of the constituent elements of the basket, when they are stacked and arranged between the two walls such as the hot and
Ces moyens vont permettre d'écarter les différents éléments par rapport à chacun de ses voisins et donc d'induire entre deux faces latérales de deux éléments voisins un écart e, ces deux faces latérales restant parallèle entre elles. De même, il se produit, lors de l'écartement des différents éléments, un positionnement de ceux-ci de sorte qu'un espace, ou jeu 27, 29, est ménagé entre les différents éléments et les parois 22,24.These means will allow to separate the various elements relative to each of its neighbors and thus to induce between two side faces of two neighboring elements a distance e, these two lateral faces remaining parallel to each other. Likewise, during the spacing of the various elements, a positioning thereof occurs so that a space, or
Une biellette a par exemple la forme représentée en
Un autre mode de réalisation des biellettes est représenté en
La distance entre les deux ouvertures et la longueur de la 2ème ouverture sont choisies de manière à ce que les deux éléments transmetteurs voisins puissent passer :
- d'une position dite initiale (
figure 4A ), dans laquelle les deux faces voisines de deux éléments voisins sont en contact, et 27, 29 est ménagé entre la base de chacun des éléments et la paroi ou la paroi 22,24 à laquelle cette base fait face,un jeu - à une position intermédiaire (
figure 4B ), dans laquelle les faces latérales voisines de deux éléments voisins sont écartées l'une de l'autre d'une distance souhaitée, et chacune des bases se rapproche de la paroi 22, 24 correspondante, - puis à une position de « placage » (
figure 4C ) danslaquelle 2 faces latérales voisines sont en contact l'une de l'autre ou plaquées l'une contre l'autre, et la base de chacun des éléments est plaquée contre la paroi 22, 24 correspondante.
- of an initial position (
Figure 4A ), in which the two neighboring faces of two adjacent elements are in contact, and a 27, 29 is provided between the base of each of the elements and the wall or theclearance 22, 24 to which this base faces,wall - at an intermediate position (
Figure 4B ), in which the adjacent side faces of two adjacent elements are spaced from each other by a desired distance, and each of the bases approaches the 22, 24,corresponding wall - then to a "plating" position (
figure 4C ) in which 2 adjacent side faces are in contact with each other or pressed against each other, and the base of each of the elements is pressed against the 22, 24 corresponding.wall
Dans ce mouvement, les extrémités de la biellette effectuent, sous l'action des moyens 21 (
Un autre mode de réalisation d'un système de liaison entre les éléments voisins est illustré en
Cette fois, l'élément 30 représenté comporte :
- deux encoches latérales, ou évidements latéraux, 203, 204, qui débouchent dans la
face plane supérieure 303 et éventuellement (comme c'est le cas sur lesfigures 5A- 5D ) dans la 301', 301 correspondante,face latérale - deux encoches latérales, ou évidements latéraux, 205, 206, qui débouchent dans la face plane inférieure 303' et éventuellement dans la
301', 301 correspondante.face latérale
- two lateral notches, or lateral recesses, 203, 204, which open into the
upper plane face 303 and optionally (as is the case on theFigures 5A-5D ) in the corresponding 301 ', 301,lateral face - two lateral notches, or lateral recesses, 205, 206, which open into the lower planar face 303 'and possibly into the corresponding
301', 301.lateral face
Dans la paroi intérieure de chaque encoche latérale est ici réalisé un trou de 203', 204' dans lequel on peut positionner un tenon, destiné à coopérer avec l'extrémité d'une bielle ou d'une biellette, comme déjà décrit ci-dessus.In the inner wall of each lateral notch is here made a
Une paroi de chaque encoche est donc destinée à être munie des moyens, par exemple au moins 1 plot ou 1 tenon, pour coupler chaque élément à l'aide, par exemple, de deux biellettes, comme expliqué ci-dessus. Chaque encoche a un volume suffisant pour accueillir une partie d'extrémité de la biellette correspondante.A wall of each notch is therefore intended to be provided with means, for example at least 1 stud or 1 pin, to couple each element using, for example, two rods, as explained above. Each notch has a volume sufficient to accommodate an end portion of the corresponding link.
Comme représenté en
Lorsqu'on veut introduire un assemblage dans le panier, on exerce une force vers le haut, comme schématisé par les flèches F sur les
Chaque élément du panier se sépare alors des éléments voisins, de la manière expliquée ci-dessus, en liaison avec les
Une fois l'assemblage en place, on applique une force vers le bas (toujours selon l'axe Oz), ou bien c'est la force de gravitation qui attire les éléments transmetteurs vers le bas, les faces planes des éléments transmetteurs viennent en contact les unes avec les autres et les jeux internes et externes disparaissent (comme en
Comme on le voit dans les vues de dessus des
Par conséquent, un assemblage, qui a en général une forme cylindrique, va être entouré par une pluralité de n éléments de panier, disposés de manière sensiblement circulaire, chaque élément de panier couvrant un secteur d'environ 360°/n. Une telle disposition est représentée en
Sur ces
La
La
Dans l'exemple de réalisation des
Dans cette réalisation, on note la présence d'une zone, entre deux cellules voisines d'un même étage, ou entre 2 éléments (par exemple 62 et 64) de panier, dans laquelle il n'y a pas d'éléments transmetteurs. Mais, pour la même raison que celle indiqué ci-dessus pour les jeux résiduels 270, 290, cela n'est pas gênant du point de vue de la conduction thermique ; en effet, la chaleur passe « à côté », dans des zones hautement conductrices du point de vue thermique (le rapport de la conductivité de l'aluminium sur celle de l'hélium est de 1000 et, sur celle de l'air, elle est d'environ 6000).In this embodiment, there is the presence of a zone, between two neighboring cells of the same stage, or between two elements (for example 62 and 64) basket, in which there are no transmitter elements. But for the same reason as that indicated above for the
Une fois le système mis en place (
Ainsi en utilisant un procédé de stockage mettant en oeuvre un panier tel que décrit ci-dessus, la limite précédemment énoncée de 2.5 kW (Tmax < 450°C) et 4.5 kW (Tmax < 650°C) passe respectivement à 3.5 kW et 6.5 kW. Lors d'un transport d'un assemblage, on peut donc atteindre 5 kW pour Tmax < 450°C et 9 kW pour Tmax < 650°C.Thus, by using a storage method using a basket as described above, the previously stated limit of 2.5 kW (Tmax <450 ° C) and 4.5 kW (Tmax <650 ° C) respectively increases to 3.5 kW and 6.5 kW. During a transport of an assembly, one can thus reach 5 kW for Tmax <450 ° C and 9 kW for Tmax <650 ° C.
La réalisation illustrée en
- une pluralité de paniers élémentaires 100-106,
- une partie fixe 55 (un empilement de disques en matériau conducteur de chaleur, par exemple en aluminium, chaque disque ayant les ouvertures appropriées pour laisser passer les paniers aux positions souhaitées),
- une couronne d'éléments de panier 550 Chaque élément étant du type selon l'invention, comme déjà présenté ci-dessus.
- a plurality of elementary baskets 100-106,
- a fixed part 55 (a stack of discs of heat-conducting material, for example aluminum, each disc having the appropriate openings for passing the baskets to the desired positions),
- a ring of
basket elements 550 Each element being of the type according to the invention, as already presented above.
Le panier ainsi constitué est disposé à l'intérieur d'un château, l'ensemble étant entouré d'une virole 54 en acier et d'une couche 52 en résine. L'ensemble peut être muni d'ailettes 56 d'évacuation de la chaleur; ce sont celles ailettes qui, sur la figure 10C, dépassent vers l'extérieur On retrouve ces références 52, 54 sur la
Un ensemble constitutif d'un château, peut donc comporter au moins un panier élémentaire tel que décrit ci-dessus, mais également un ensemble de couches absorbantes, par exemple une couche 54 (qui peut être en acier forgé ou en plomb) pour absorber le rayonnement gamma, et une couche 52 (contenant beaucoup d'hydrogène) pour ralentir les neutrons.A constituent assembly of a castle, may therefore comprise at least one elementary basket as described above, but also a set of absorbent layers, for example a layer 54 (which may be forged steel or lead) to absorb the gamma radiation, and a layer 52 (containing a lot of hydrogen) to slow the neutrons.
Un panier élémentaire peut avoir la structure qui vient être décrite ci-dessus, sur toute sa hauteur.An elementary basket may have the structure that has just been described above, over its entire height.
Il peut également avoir une telle structure sur une hauteur h limitée, qui correspond à la puissance que l'on veut évacuer, par exemple environ 1 m, comme cela apparaît par exemple en
En variante, comme illustrée en
Les
Dans un premier temps (
Puis (
Le panier étant maintenu dans cette position soulevée, on peut introduire un élément combustible 15 (voir la
On inverse ensuite la force d'appui sur les éléments de la paroi du panier, comme illustré en
Enfin, l'ensemble est refermé, en ramenant les couvercles dans leur position initiale (voir
L'ensemble peut ensuite être soulevé de la piscine pour égouttage.The set can then be lifted from the pool for draining.
On présente dans la suite des résultats numériques pour des châteaux transportant 1, 7 ou 12 assemblages. Ces châteaux sont nommés TC1, TC2 ou TC12 selon qu'ils transportent 1, 2 ou 7 assemblages.Numerical results are presented in the following for castles carrying 1, 7 or 12 assemblies. These castles are named TC1, TC2 or TC12 depending on whether they carry 1, 2 or 7 assemblies.
Pour une limite de 650°C, la puissance par assemblage va de 4,6kW (TC12) à 6,3kW (TC1) pour des jeux standards. Annuler ces jeux permettrait d'obtenir respectivement 6,6kW à 8,8kW.For a limit of 650 ° C, the power per assembly ranges from 4.6kW (TC12) to 6.3kW (TC1) for standard sets. Cancel these games would get respectively 6.6kW to 8.8kW.
Ci-dessous, on chiffre les gains réalisés en termes de puissance évacuable pour un critère de température donné, pour le cas d'assemblages chargés en actinides mineurs.Below, the gains made in terms of evacuable power for a given temperature criterion are recorded for the case of assemblies loaded with minor actinides.
La géométrie choisie pour le château est une géométrie multi couches, représentée en vue de dessus en
représentée en vue de dessus en
represented in plan view in
Trois cas en ont été étudiés : le cas d'un seul assemblage, celui de 7 assemblages et celui de 12 assemblages.Three cases have been studied: the case of a single assembly, that of 7 assemblies and that of 12 assemblies.
Pour le cas d'un seul assemblage, l'étude de l'effet des paramètres Tmax et des jeux conduit aux résultats suivants, donnés en
- la courbe I correspond à 2 jeux de 1 mm chacun,
- la courbe Il correspond à 1 jeu interne de 5
mm et 1 jeu externe de 1 mm, - la courbe III correspond à 1 jeu interne de 5
mm et 1 jeu externe de 2 mm, - la courbe IV correspond à 2 jeux de 5 mm,
- la courbe V correspond à 2 jeux de 0 mm, c'est-à-dire à un contact obtenu selon la présente invention,
- the curve I corresponds to 2 sets of 1 mm each,
- the curve It corresponds to 1 internal clearance of 5 mm and 1 external clearance of 1 mm,
- curve III corresponds to 1 internal clearance of 5 mm and 1 external clearance of 2 mm,
- curve IV corresponds to 2 sets of 5 mm,
- the curve V corresponds to 2 sets of 0 mm, that is to say to a contact obtained according to the present invention,
Par exemple, pour une valeur maximale de 650°C :
- dans le cas de la courbe I, on peut évacuer 8kW,
- dans le cas standard (courbe III) on peut évacuer environ 6.3kW,
- et l'optimum est de 8.7kW lorsque les jeux disparaissent (courbe V). Pour le cas de 7 assemblages, lors de l'étude paramétrique, on n'a étudié que le cas standard et celui où les jeux sont nuls (les autres cas étant compris entre
ces 2 cas limites). L'étude de l'effet des paramètres Tmax et des jeux conduit aux résultats suivants, donnés enfigure 11 sur laquelle : - la courbe I' correspond à 1 jeu interne de 5
mm et 1 jeu externe de 1 mm; dans ce cas standard on peut évacuer 5.5kW par assemblage, soit une puissance totale de 39 kW et la résine a une température comprise entre 70°C et 88°C, - la courbe II' correspond à 2 jeux de 0 mm.
- in the case of curve I, 8kW can be evacuated,
- in the standard case (curve III) about 6.3kW can be evacuated,
- and the optimum is 8.7kW when the games disappear (curve V). For the case of 7 assemblies, during the parametric study, we studied only the standard case and the one where the games are null (the other cases being included between these 2 limit cases). The study of the effect of Tmax parameters and games leads to the following results, given in
figure 11 on which : - the curve I 'corresponds to 1 internal clearance of 5 mm and 1 external clearance of 1 mm; in this standard case 5.5kW can be evacuated per assembly, ie a total power of 39 kW and the resin has a temperature between 70 ° C and 88 ° C,
- Curve II 'corresponds to 2 sets of 0 mm.
Là encore, on voit que la réduction des jeux permet, à une température au centre maximal donné, d'augmenter la puissance évacuable.Again, we see that the reduction of the games allows, at a given maximum center temperature, to increase the evacuable power.
Pour le cas de 12 assemblages, lors de l'étude paramétrique, on n'a étudié que le cas standard et celui où les jeux sont nuls (les autres cas étant compris entre ces 2 cas limites). L'étude de l'effet des paramètres Tmax et des jeux conduit aux résultats suivants, donnés en
- la courbe I" correspond à 1 jeu interne de 5
mm et 1 jeu externe de 1 mm ; dans ce cas standard on peut évacuer 4.5kW par assemblage, soit une puissance totale de 54 kW, la température au centre étant inférieure à 650°C, - la courbe II" correspond à 2 jeux de 0 mm.
- curve I "corresponds to 1 internal clearance of 5 mm and 1 external clearance of 1 mm, in this case it is possible to evacuate 4.5 kW per assembly, ie a total power of 54 kW, the center temperature being less than 650 ° C. ,
- Curve II "corresponds to 2 sets of 0 mm.
Dans ce cas de forte puissance la résine externe atteint une température de 80°C.In this case of high power, the external resin reaches a temperature of 80 ° C.
Les résultats de la
On a synthétisé dans le tableau II ci-dessous la puissance évacuable, pour les trois configurations ci-dessus, et pour 2 températures maximales différentes (450° C et 650° C). La puissance évacuable est indiquée pour chacun de ces cas, soulignée lorsque les jeux sont nuls.
L'invention s'applique dans le domaine stockage et/ou du transport de matières radioactives de forte puissance, notamment de combustibles de forte puissance de la génération IV, par exemple encore d'assemblages chargés en actinides mineurs.The invention applies in the field of storage and / or transport of high power radioactive materials, especially high-power generation IV fuels, for example still assemblies loaded with minor actinides.
Claims (15)
- Heat-transmitting element (30, 32, 34, 36) for a nuclear fuel storage rack, of substantially prismatic shape, comprising 3 main surfaces (303, 303', 305, 325, 345, 365), including a base and 2 secondary surfaces, and two side surfaces (301, 301'), made of a heat-transmitting material, these two side faces being provided with a means for pulling the element in a direction parallel to the base, and to bring it from an initial position, in which the transmitter element is released and is against a wall, called hot or cold, to a raised position, separated therefrom by a space, or a clearance (27, 29), and vice-versa.
- Element according to claim 1, the means for pulling the element:- being placed on the side surfaces,- or comprising side notches or side recesses (203, 204, 205, 206) formed in the element, each recess emerging in one of the secondary planar surfaces, and optionally in the corresponding side surface (303).
- Element according to claim 2, the means for pulling the element comprising at least 2 pins or 2 lugs (30', 30", 32', 32", 34', 34", 36', 36"), placed on each side surface or on a wall of each side notch or side recess.
- Element according to one of claims 1 to 3, comprising at least one traction link (40, 42, 44, 47) cooperating with the means for pulling the element in a direction parallel to the base, the traction link possibly having an interior at least in part cut out.
- Element according to one of the preceding claims, having at least one of the following features:- the element has, in a plane perpendicular to the base, a substantially triangular shape;- the base is planar or forms a portion of cylinder (305').- the secondary surfaces (303, 303') are planar or provided with undulations.
- Nuclear fuel storage rack element (60, 62, 64, 66, 68, 70), comprising:- a first stack of transmitter elements according to one of the preceding claims, arranged between the two walls, each secondary surface of an element being opposite a secondary surface of a neighbouring transmitter element, the bases of the different absorbing elements being alternatively turned towards one side of the stack, then towards the other, each transmitter element being connected to its neighbours by the means for pulling the element in a direction parallel to the base,- means (21) for exerting a traction on the assembly of transmitter elements.
- Storage rack element (60, 62, 64, 66, 68, 70) according to the preceding claim, each secondary surface of an element:- being in contact with a secondary surface of a transmitter element when no traction is exerted on the assembly of transmitter elements,- and being situated at a non-zero distance, from said secondary surface, and substantially parallel thereto, when a traction is exerted on the assembly of transmitter elements.
- Storage rack element (60, 62, 64, 66, 68, 70) according to claim 6 or 7, the stack of transmitter elements having a height (h) less than the total height of the rack element.
- Storage rack element (60, 62, 64, 66, 68, 70) according to one of claims 6 to 8, further comprising at least one second stack of transmitter elements according to one of claims 1 to 5, arranged in a zone (200, 200') separated from the first stack by a continuous portion of material.
- Nuclear fuel storage rack, comprising a plurality of storage rack elements according to one of claims 6 to 9, arranged so as to delimit a central cavity (17) of substantially cylindrical or square or rectangular or hexagonal shape in a plane perpendicular to the direction of traction of each rack.
- Cask for the storage and/or the transport of nuclear fuel, comprising at least one storage rack according to the preceding claim, surrounded by a peripheral protection layer (54) for the absorption of gamma rays and a peripheral protection layer (52) to slow down neutrons.
- Cask for the storage of nuclear fuel, according to the preceding claim, comprising several racks in number comprised between 2 and 12.
- Method for storing and/or transporting nuclear fuel rods (15), comprising the following steps:- exerting a traction on the transmitter elements of the rack elements of a storage rack according to claim 10, so as to bring them from an initial position to a raised position and to generate a clearance (27, 29) between each transmitter element and the two planes (22,24) which define the hot and cold surfaces,- introducing one or more fuel rods into the central cavity (17),- releasing the transmitter elements, so as to bring them back to the initial position, in which the base of each transmitter element is positioned in contact with one or the other of the two hot and cold walls (22,24).
- Method according to claim 13, comprising a prior step of introduction of the storage rack into a pool (12), and a later step of extraction from the pool of the rack loaded with the rods.
- Method according to claim 13 or 14, in which each fuel rod has a power at least equal to 7 kW or 8 kW.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1252769A FR2988898A1 (en) | 2012-03-28 | 2012-03-28 | METHOD AND MOBILE DEVICE FOR REDUCING THERMAL RESISTANCE BETWEEN TWO SOLIDS |
PCT/EP2013/056792 WO2013144326A1 (en) | 2012-03-28 | 2013-03-28 | Method and mobile device for reducing the thermal resistance between two solids |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2831888A1 EP2831888A1 (en) | 2015-02-04 |
EP2831888B1 true EP2831888B1 (en) | 2016-07-27 |
Family
ID=48141918
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13717200.3A Not-in-force EP2831888B1 (en) | 2012-03-28 | 2013-03-28 | Method and mobile device for reducing the thermal resistance between two solids |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP2831888B1 (en) |
JP (1) | JP6239586B2 (en) |
CN (1) | CN104246904B (en) |
FR (1) | FR2988898A1 (en) |
RU (1) | RU2608765C2 (en) |
WO (1) | WO2013144326A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2019110641A1 (en) | 2017-12-07 | 2019-06-13 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Storage basket for storing or transporting nuclear materials |
Citations (2)
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US3804676A (en) * | 1971-10-01 | 1974-04-16 | Isotopes Inc | Thermoelectric generator with thermal expansion block |
US4475145A (en) * | 1982-07-12 | 1984-10-02 | Rockwell International Corporation | Circuit board heatsink assembly and technique |
Family Cites Families (14)
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US3119933A (en) * | 1960-05-03 | 1964-01-28 | Stanray Corp | Container for transporting thermally hot intensely radioactive material |
NL266686A (en) * | 1960-07-06 | |||
US3229096A (en) * | 1963-04-03 | 1966-01-11 | Nat Lead Co | Shipping container for spent nuclear reactor fuel elements |
US3466445A (en) * | 1967-10-06 | 1969-09-09 | Atomic Energy Commission | Container for radioactive fuel elements |
US3731101A (en) * | 1971-04-14 | 1973-05-01 | Nl Industries Inc | Shipping container for radioactive material |
KR100315869B1 (en) | 1994-03-22 | 2002-02-28 | 모리스 다니엘 | Nuclear Fuel Assembly Rack |
SE509491C2 (en) * | 1995-01-10 | 1999-02-01 | Hydro Betong Ab | Methods and apparatus for storing hazardous waste |
SE516262C2 (en) * | 2000-04-11 | 2001-12-10 | Oyster Int Nv | Methods for making nuclear fuel storage containers and plant for carrying out the method |
JP2003315488A (en) * | 2002-04-26 | 2003-11-06 | Hitachi Ltd | Spent nuclear fuel housing container |
FR2865571B1 (en) * | 2004-01-23 | 2006-04-28 | Cogema Logistics | STORAGE DEVICE PROVIDED TO BE PLACED IN A PACKAGING FOR TRANSPORTING RADIOACTIVE MATERIALS |
FR2915307B1 (en) * | 2007-04-18 | 2013-04-19 | Tn Int | CONTAINER FOR THE TRANSPORT AND / OR STORAGE OF NUCLEAR MATERIALS, THE CONTAINER COMPRISING A MOBILE THERMAL CONDUCTION STRUCTURE. |
FR2952467B1 (en) * | 2009-11-10 | 2011-12-23 | Tn Int | PACKAGING FOR THE TRANSPORT AND / OR STORAGE OF RADIOACTIVE MATERIALS CONFERRING ENHANCED THERMAL TRANSFER |
DE102009046883A1 (en) | 2009-11-19 | 2011-06-09 | Moog Unna Gmbh | Pitch drive device for a wind or hydroelectric power plant |
FR2961942B1 (en) * | 2010-06-25 | 2014-04-11 | Tn Int | CONTAINER FOR THE TRANSPORT AND / OR STORAGE OF RADIOACTIVE MATERIALS |
-
2012
- 2012-03-28 FR FR1252769A patent/FR2988898A1/en active Pending
-
2013
- 2013-03-28 WO PCT/EP2013/056792 patent/WO2013144326A1/en active Application Filing
- 2013-03-28 RU RU2014143195A patent/RU2608765C2/en not_active IP Right Cessation
- 2013-03-28 JP JP2015502368A patent/JP6239586B2/en not_active Expired - Fee Related
- 2013-03-28 CN CN201380018204.1A patent/CN104246904B/en not_active Expired - Fee Related
- 2013-03-28 EP EP13717200.3A patent/EP2831888B1/en not_active Not-in-force
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US3804676A (en) * | 1971-10-01 | 1974-04-16 | Isotopes Inc | Thermoelectric generator with thermal expansion block |
US4475145A (en) * | 1982-07-12 | 1984-10-02 | Rockwell International Corporation | Circuit board heatsink assembly and technique |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2019110641A1 (en) | 2017-12-07 | 2019-06-13 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Storage basket for storing or transporting nuclear materials |
Also Published As
Publication number | Publication date |
---|---|
CN104246904A (en) | 2014-12-24 |
JP6239586B2 (en) | 2017-11-29 |
RU2014143195A (en) | 2016-05-20 |
WO2013144326A1 (en) | 2013-10-03 |
RU2608765C2 (en) | 2017-01-24 |
JP2015513101A (en) | 2015-04-30 |
EP2831888A1 (en) | 2015-02-04 |
FR2988898A1 (en) | 2013-10-04 |
CN104246904B (en) | 2017-09-26 |
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