FR3101474A1 - STORAGE BASKET FOR RADIOACTIVE MATERIALS, SIMPLIFIED DESIGN PROVIDING IMPROVED THERMAL TRANSFER PROPERTIES - Google Patents

Abstract

The invention relates to a storage basket (1) for radioactive material (2), the basket defining one or a plurality of housings (4) for receiving radioactive material (2), the basket comprising a plurality of transverse plates (20). ) distributed along the longitudinal central axis (6) of the basket, each transverse plate (20) comprising a main plate portion (26) oriented orthogonally to the longitudinal central axis (6) and having one or a plurality of passage orifices (24) intended to be crossed by the radioactive materials (2). According to the invention, at least one passage orifice (24) of at least one of the transverse plates (20) has, on the main plate portion (26), an orifice outline (32) from which at least a folded heat transfer plate portion (30) extends axially from the main portion (26). Figure for the abstract: Figure 1.

Description

STORAGE BASKET FOR RADIOACTIVE MATERIALS, SIMPLIFIED DESIGN PROVIDES IMPROVED HEAT TRANSFER PROPERTIES

The present invention relates to the field of transport and/or storage of radioactive materials. It may, for example, be fresh or irradiated fuel assemblies, or radioactive waste.

A basket, also called storage “device” or “rack”, defines one or a plurality of adjacent housings each capable of receiving radioactive materials. The basket is housed in the containment enclosure of a package. It is designed to be able to fulfill several essential functions, including the thermal transfer function of the heat released by the radioactive materials.

Many technical solutions are already known for making such baskets. For example, it has been envisaged to provide sleeves/tubes arranged in parallel and each forming a housing intended to receive radioactive materials. In this case, for example disclosed in document EP 1 212 755 A1, the tubes are held together by transverse plates spaced from each other along the central longitudinal axis of the basket. To do this, each of these plates is crossed by the liners at the through holes. A similar design, without the liners but only keeping the transverse plates spaced from each other, is also known.

These solutions with transverse plates are satisfactory, but they can still be improved in terms of heat transfer and manufacturing cost. In fact, at the level of each passage orifice, the radioactive materials or the sleeve which passes through this orifice is in contact with the orifice outline, forming a contact surface limited by the thickness of the transverse plate. This limitation of the contact surface impairs the heat transfer function between the radioactive materials and the components of the basket. Furthermore, to make the passage orifices through the transverse plates of the basket, these plates are generally machined, leading to a loss of the removed material.

The object of the invention is therefore to at least partially remedy the drawbacks mentioned above, relating to the embodiments of the prior art.

To do this, the subject of the invention is a storage basket for radioactive materials, the basket being intended to be arranged in a packaging for the transport and/or storage of radioactive materials, the basket defining one or a plurality of housings each intended to receive radioactive materials, the housings being parallel to each other and each extending along a housing axis parallel to a central longitudinal axis of the basket, the latter comprising:
- a plurality of transverse plates distributed along the central longitudinal axis of the basket, each transverse plate comprising a main plate portion oriented orthogonally to the central longitudinal axis and having one or a plurality of through holes intended to be passed through by radioactive materials.

According to the invention, at least one passage orifice of at least one of the transverse plates has, on the main portion of the plate, an orifice outline from which extends at least one portion of folded transfer plate thermal, projecting axially from the main plate portion.

The invention thus breaks with previous solutions by retaining at least part of the material initially provided at the level of the passage orifice, in order to form a portion of folded plate serving to evacuate the heat given off by the radioactive materials. The folded plate portion thus makes it possible to improve the heat transfer function between the radioactive materials and the transverse plates, while limiting/avoiding the loss of materials at the level of the passage orifices of these same plates.

The invention also has at least one of the following optional features, taken individually or in combination.

The basket comprises means for axial spacing between the main plate portions of at least two directly consecutive transverse plates.

According to a preferred embodiment of the invention, for at least one set of two directly consecutive transverse plates, the means of axial spacing between the main plate portions comprise at least one folded plate portion belonging to at least one of the two transverse plates of this set.

Preferably, for at least one set of two directly consecutive transverse plates, the axial spacing means between the main plate portions comprise at least one folded plate portion belonging to one of the two transverse plates of this set, as well as at least one folded plate portion belonging to the other of the two transverse plates of this set.

Preferably, for at least one set of two directly consecutive transverse plates, including a primary transverse plate and a secondary transverse plate, the axial spacing means between the main plate portions comprise at least one folded plate portion associated with the one of the orifices of the primary plate, called primary orifice, as well as at least one folded plate portion associated with one of the orifices of the secondary plate, called secondary orifice, the primary and secondary orifices being aligned along the axis housing of the housing associated with said primary and secondary ports.

Preferably, for at least one set of two directly consecutive transverse plates, the means of axial spacing between the main plate portions comprise several folded plate portions associated with several orifices of at least one of the two transverse plates of this together, and preferably at least one, and even more preferably two folded plate portions associated with each orifice of at least one of the two transverse plates of this set, and preferably with each orifice of each of these two transverse plates .

Preferably, the basket comprises at least one set of two directly consecutive transverse plates, corresponding respectively to two plates of identical design, facing each other, and being offset by 90° with respect to each other. another along the central longitudinal axis of the basket. This particular design makes it possible to simplify the manufacture of the basket, and to reduce its costs.

The basket comprises a plurality of sets stacked along the central longitudinal axis of the basket, said sets being arranged back to back.

According to another preferred embodiment of the invention, the axial spacing means comprise spacing elements added between the main plate portions, preferably spacers.

Preferably, for two directly consecutive transverse plates whose main portions are spaced from each other by said added spacing elements, the axial spacing distance between the two main plate portions is strictly greater than the axial distance protrusion of each folded plate portion projecting between these two main portions.

The two preferred embodiments described above can be combined, without departing from the scope of the invention.

Regardless of the embodiment adopted, for at least one of the passage orifices of at least one of the transverse plates, and preferably for each of these orifices of each of the plates, the cumulative surface of the folded plate portions associated with the passage orifice preferably corresponds to at least 80% of the surface of this orifice delimited by its contour.

Preferably, at least one housing of the basket is defined by a sleeve made in one piece or from several axial plates passing through several passage orifices aligned along the corresponding housing axis and belonging to different transverse plates of the basket, at the at least one of the folded plate portions associated with each of said aligned passage orifices being in contact with an outer surface of the liner. Alternatively, the housing can be defined directly by the folded plate portions.

Preferably, at least one of the transverse plates is a sheet made of an aluminum-based material, and/or with a thickness of less than 1 cm.

Preferably, the orifice contour of at least one passage orifice of at least one transverse plate has a plurality of contour sections succeeding each other, preferably four contour sections succeeding each other, including two first contour sections facing each other, and two second contour sections facing each other. The passage orifice therefore has the overall shape of a quadrilateral, for example square, but other shapes can be envisaged, such as a hexagonal shape.

Preferably, the first two contour sections are free, and a folded heat transfer plate portion extends from at least one of the two second contour sections, and preferably from each of the two second contour sections.

Preferably:
the primary orifice has a contour whose first two contour sections are free, and for which a portion of folded heat transfer plate extends from each of the two second contour sections,
the secondary orifice has a contour whose first two contour sections are free, and for which a portion of folded heat transfer plate extends from each of the two second contour sections,
the first contour sections each have a first support member projecting transversely towards the inside of the associated passage orifice,
each folded plate portion comprises on the one hand a free axial end whose edge has an axial notch, and on the other hand two opposite side edges each having an axially oriented shoulder,
each portion of folded plate associated with the primary orifice projects axially in the direction of the secondary orifice and vice versa, so that:
- the first two support members associated with the primary orifice are in axial support respectively in the two axial notches of the folded plate portions associated with the secondary orifice, as are the first two support members associated with the secondary orifice are in axial support respectively in the two axial notches of the folded plate portions associated with the primary orifice, and/or
- the shoulders on the side edges of the folded plate portions associated with the two primary and secondary orifices are in axial support in pairs.

This design allows easy interlocking of the two transverse plates, thanks to the specific geometry of the passage orifices and their folded plate portions.

Preferably, each folded plate portion extends over the entire length of its associated contour section.

Preferably, each folded plate portion has a free axial end whose edge is parallel or substantially parallel to the contour section from which this folded plate portion extends.

Finally, the invention also relates to a method of manufacturing such a storage basket, comprising a step of producing at least one of the transverse plates of which at least one passage orifice is present, on the main portion of plate, an orifice outline from which extends at least one folded heat transfer plate portion, projecting axially from the main plate portion, this production step being implemented from a plate raw first cut to reveal each portion of plate to be folded on the main portion of plate, then by folding so as to obtain each portion of folded heat transfer plate.

Other advantages and characteristics of the invention will appear in the non-limiting detailed description below.

This description will be given with regard to the appended drawings, among which;

shows an exploded view in longitudinal section of a packaging for the transport and/or storage of radioactive materials, housing a storage basket according to a first preferred embodiment of the invention;

shows a section taken along line II-II of Figure 1;

shows a top view of one of the transverse plates forming the basket shown in Figure 1;

shows a sectional view taken along the line IV-IV of Figure 3;

represents a view in longitudinal section of a basket similar to that of FIG. 1, according to an alternative embodiment;

represents a section taken along line VI-VI of FIG. 5;

schematically represents different operations for the production of one of the transverse plates of the basket shown in the preceding figures;

shows a view similar to that of Figure 1, with the basket in the form of a second preferred embodiment of the invention;

shows a view similar to that of Figure 8, with the basket in the form of a third preferred embodiment of the invention, this view corresponding to a sectional view along the line IX-IX of Figure 10 ;

shows a sectional view taken along the line XX of Figure 9;

shows a perspective view of a transverse plate for the manufacture of a basket with 32 slots;

shows a perspective view of a set of two transverse plates according to the design shown in Figure 11, these two plates being nested one inside the other;

shows an enlarged exploded perspective view of part of the two transverse plates shown in Figure 12;

is a perspective view similar to the previous one, showing the two interlocking transverse plates;

shows a view similar to the previous one, cut along a plane passing through two axially aligned passage orifices; And

is a perspective view schematically representing an operation for the production of one of the transverse plates shown in Figures 13 to 15.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

With reference first of all to FIG. 1, there is shown a packaging 100 for the transport and/or storage of radioactive materials. This packaging 100 houses a storage basket 1 according to a first preferred embodiment of the invention, in which the radioactive materials 2 are intended to be stored, in one or more housings 4 adjacent and parallel to a central longitudinal axis 6 of the basket . Also, each housing 4 has a housing axis 8 parallel to the central axis 6 of the basket 1, corresponding to the longitudinal central axis of the packaging. In Figure 1, the basket has been shown with a single housing 4, implying that the axes 6 and 8 coincide.

The packaging 100 defines a containment enclosure 12 in which the basket 1 is intended to be housed. Conventionally, the packaging is formed by an outer lateral body 14, a fixed bottom 16 and a removable cover 18 closing the enclosure 12. When the packaging is loaded with radioactive materials 2 held by the basket 1, the whole thus formed is conventionally referred to as a “package”.

The storage basket 1 has a generally cylindrical shape with axis 6, and of complementary circular section to that of the enclosure 12. The housing(s) 4 here have a section in the overall shape of a quadrilateral, for example square or rectangular, but which could adopt any other shape intended to adapt to the shape of the radioactive materials received in the housing 4. As will appear in more detail below, the housing 4 is not continuous over the entire height of the basket, but interrupted along its housing axis 8.

By way of indication, it is noted that if only a single housing 4 has been represented on the basket of FIG. 1, the number of these housings can be high, preferably greater than 10. These are for example 32 housings which are defined by basket 1, each of these housings receiving radioactive materials 2 such as fresh or irradiated fuel assemblies, or radioactive waste.

The basket 1 is made using various elements, including several transverse plates 20 distributed along the longitudinal central axis 6. In this first preferred embodiment of the invention, the transverse plates 20 are thus spaced from each other in a longitudinal direction 22 of the basket, parallel to its central longitudinal axis 6 and also corresponding to a direction of the height of the basket and of the packaging.

The transverse plates 20, also called wafers, are thus oriented transversely within the basket, that is to say arranged orthogonally to the axes 6, 8. They are preferably made of an aluminum-based material to present good heat conduction properties. In addition, their thickness may be small, for example less than 1 cm.

Each transverse plate 20 has the general shape of a disk made using a sheet pierced with one or a plurality of orifices 24, the number of which corresponds to the total number of housings 4 within the basket.

More specifically, each transverse plate 20 comprises a main plate portion 26, which corresponds to the main disc-shaped part oriented orthogonally to the axis 6. It is this flat main disc portion 26 which is pierced by the passage orifices 24 intended to be traversed by the radioactive materials.

At each orifice 24 of the main portion 26, the transverse plate 20 is completed by at least one folded plate portion 30, the function of which is to ensure heat transfer between the radioactive materials 2 and the main plate portion 26 This folded plate portion 30 therefore corresponds to a part initially belonging to the main plate portion, but which was then trimmed and then folded to leave the plane of this main portion 26. The transverse plate 20 thus corresponds to a one-piece plate, that is to say made in one piece integrating the main portion 26, as well as one or more folded portions 30.

With reference to Figures 1 to 4, there will be described in more detail one of the transverse plates 20, and in particular the folded portions 30 of heat transfer.

Each passage orifice 24 made through the main plate portion 26 is delimited by an orifice outline 32. This outline 32, present on the main plate portion, corresponds to the surface defined in the thickness of the main portion 26 , and thus delimiting the passage orifice 24. In this first preferred embodiment, the contour 32 has a plurality of contour sections succeeding each other, here four contour sections among which two first contour sections 32a are facing, as well as two second contour sections 32b facing each other. The four sections 32a, 32b are connected at their ends, and they thus delimit the substantially square or rectangular section of the passage orifice 24.

The first two contour sections 32a are free, straight or substantially straight. On the other hand, a portion of folded heat transfer plate 30 extends from each of the two second contour sections 32b. The latter, represented by dotted lines in the figures, therefore remain fictitious given that they are not free, but extended by folded portions 30. It is in fact from each second contour section 32b that extends a folded portion 30 initially belonging to the main plate portion 26, the second section 32b being able to be likened to a fold line of the folded portion 30. The latter therefore extends axially projecting from the main plate portion 26. To do this, it begins with a bent part 30' of small radius, at an angle of approximately 90°. The bent part 30', which extends into the passage orifice 24, is extended by a substantially planar axial part 30'' parallel to the axes 6, 8.

When the radioactive materials 2 are loaded into the housing 4 defined in part by the orifice 24 and the folded portions 30, the outer surface of these materials 2 is in contact with at least one of the first free contour sections 32a , and/or in contact with the axial part 30'' of at least one of the two folded portions 30 projecting from the second contour sections 32b.

The two folded portions 30 are arranged facing each other, as two portions folded in the same direction, from the main plate portion 26. They are preferably symmetrical with respect to a median axial plane of the housing 4 The combined surface of the two folded plate portions 30 corresponds to at least 80% of the surface of the orifice, delimited between the four sections 32a, 32b of its outline 32. Thus, at the passage orifices 24, a very a large part of the material initially provided within the main plate portion 26 is functionalized, being dedicated to the heat transfer function.

In this first preferred embodiment, the folded portions 30 extend axially downwards from the main portion 26 of the transverse plates 20. Nevertheless, they could extend upwards, without departing from the scope of the invention. . Within the same basket, plates 20 could integrate folded portions 30 in a given direction while other plates could integrate folded portions 30 in an opposite direction, just as one or more plates 20 could integrate folded portions 30 in two opposite directions.

The folded portions 30 extend in a direction going towards a directly consecutive transverse plate of the basket, but without coming into contact with the latter. Indeed, the basket 1 also incorporates axial spacing means between the main portions 26 of two transverse plates 20 directly consecutive. In this first preferred embodiment, the spacing means comprise axial spacing elements in the form of spacers 40, clamped between the main plate portions 26. The spacers 40 thus determine an axial spacing distance "DE" between two main portions 26 directly consecutive. This distance "DE" is strictly greater than the axial projection distance "DA" of each folded plate portion 30 projecting axially between these two main portions 26, as can be seen in Figure 1.

These spacers 40 are for example made of steel, preferably stainless steel. They are crossed by tie rods 42 extending over the entire length of the basket 1, up to a basket base 45, so as to axially enclose the spacers 40 and the main plate portions 26 also crossed by these tie rods. This system of tie rods 42, making it possible to maintain the parts of the basket relative to each other by enclosing them axially, remains known as such. It will therefore not be further described.

Each folded portion 30 extends over the entire length of its associated contour section 32b, as is best seen in Figure 3. In other words, the width of each folded portion 30 is identical or substantially identical to the length of the contour section 32b from which this folded portion 30 projects. Furthermore, each folded portion 30 has, opposite its bent part 30', a free axial end 46 whose edge is parallel or substantially parallel to the second associated contour section 32b.

With this design, each housing defined by the first contour sections 32a and the folded portions 30 is therefore interrupted axially, as indicated above.

According to an alternative embodiment shown in Figure 5, the housing 4 of the basket 1 is no longer directly defined by the folded portions 30 and by the first contour sections 32a, but it is delimited by a sleeve 44 also called a tube, and extending over the entire length of the basket or over substantially all of this length. The sleeve 44 is made in one piece, or from several axial plates, for example four axial plates as shown in Figure 6. The sleeve 44 passes through several through holes 24 aligned along the housing axis 8, these orifices belonging to different transverse plates 20 of the basket. In this alternative configuration, at least a part of the outer surface of the radioactive materials 2 is in contact with the inner surface of the jacket 44. Similarly, the outer surface of the jacket 44 is in contact with at least one first free contour sections 32a of each of the orifices 24 associated with the housing 4, and/or in contact with the axial part 30'' of at least one of the two folded portions 30 associated with each of these orifices.

The production of each transverse plate 20 is shown schematically in FIG. 7. A first operation (a) consists of starting from a rough plate 200 of circular shape, of diameter corresponding to that of the main portion of the desired plate. A following operation (b) consists in cutting out this raw plate 200 to reveal each portion of plate 300 to be folded. The cut lines have been referenced 50 in Figure 7. Finally, an operation (c) of folding the portions 300 is carried out, so as to obtain the folded portions 30 projecting from the second contour sections 32b belonging to the main portion of plate 26.

According to a second preferred embodiment shown in FIG. 8, the axial spacing means between the transverse plates 20 are no longer produced by spacers, but by the folded portions 30 of these same plates 20. Indeed, for at least a set 60 of two directly consecutive transverse plates 20, the means of axial spacing between the two main plate portions 26 are here made by the two folded plate portions 30 belonging to one of the two transverse plates 20. These two portions 30 are such that their two free axial ends 46 bear axially on the bent part 30' of the two folded portions 30 belonging to the other transverse plate 20 of the assembly 60. This principle is preferably adopted for all the transverse plates 20 of the basket, which are preferably of identical design, and which all adopt the same angular position in relation to the axis 6.

Of course, this second preferred embodiment can be implemented with or without a sleeve 44.

Figures 9 and 10 show a third preferred embodiment of the invention, similar to the second mode. Indeed, the axial spacing means between the two transverse plates of a set 60 are here made from the folded portions 30 of the two plates of this set. These two plates are called respectively primary transverse plate 20a for the highest in the stack, and secondary transverse plate 20b for the lowest.

In other words, the two folded portions 30 of one of the two plates 20a, 20b allow axial support on the other of the two plates, and vice versa. In this context, the two transverse plates 20a, 20b of each assembly 60 are preferably of identical design, and they face each other while being angularly offset from each other with respect to the axis 6, according to an angular offset of 90°.

Consequently, the primary plate 20a comprises a primary passage orifice 24a from which extend two folded portions 30 in the direction of the secondary plate 20b, until they come into contact with the latter with their free axial ends 46. In the same way , the secondary plate 20b comprises a secondary passage orifice 24b from which extend two folded portions 30 in the direction of the primary plate 20a, until they come into contact with the latter with their free axial ends 46. Thanks to the angular offset between the two transverse plates 20a, 20b, the four folded portions 30 define a space substantially closed transversely, intended to form an axial part of the housing 4, or else intended to receive a jacket. Such a space can also be obtained with plates 20a, 20b of different designs, without departing from the scope of the invention. This design can in particular be adopted when the basket defines only two housings.

In all cases, the thermal function is improved by the presence of these four folded heat transfer portions 30.

Thanks to this design, the housing 4 can thus be continuous or substantially continuous transversely and over the entire length of the basket.

The sets 60 thus formed are then arranged back to back as shown in Figure 9, and pressed axially against each other using the tie rods 42 which pass through them.

As indicated previously, the transverse plates 20 can be provided to define a single housing for radioactive materials, or else a plurality of parallel housings, with axes 8. In the latter case, each plate 20 has a plurality of passage orifices 24 to each of which are associated two folded portions 30, as shown on the plate 20 of Figure 11 dedicated to the production of a basket with 32 slots. The folded portions 30 associated with the 32 passage orifices 24 can be all parallel, or else oriented alternately along two orthogonal directions, as shown in FIG. 11. FIG. 12 represents the assembly 60 obtained by the axial fitting of two of these transverse plates 20, which are angularly offset by an angle of 90° relative to each other. Each group of four folded portions 30, facing two by two, forms an axial section of one of the 32 housings 4, or an axial section of a space to receive a sleeve itself defining said housing 4.

Figures 13 to 15 show a particular embodiment of the passage orifices and the folded portions, so as to obtain an interlocking conferring the desired axial support between the two directly consecutive primary and secondary plates 20a, 20b. The description is focused on two primary and secondary orifices 24a, 24b aligned axially, but this design is preferably retained for any cooperation between two aligned passage orifices 24a, 24b of the assembly 60. Here too, the space defined between the four folded portions 30 form an axial section of one of the 32 housings 4, or an axial section of a space to receive a sleeve itself defining said housing 4.

In FIGS. 13 to 15, there are shown first contour sections 32a each having a first bearing member 62 projecting transversely inward from its associated passage orifice 24a, 24b. This first support member 62 has the shape of a narrow band centered on the first associated section 32a, and running along the latter.

Furthermore, for each of the folded plate portions 30 of the two plates 20a, 20b, the edge of the free axial end 46 has an axial notch 64 of shallow depth, also centered on this same edge. In addition, the two opposite side edges of each of the folded portions 30 each have a shoulder 66 oriented axially in the direction of the other transverse plate. Here too, each shoulder 66 is preferentially centered on its side edge.

Thanks to this design, when the two transverse plates 20a, 20b are nested one inside the other as shown in Figures 14 and 15, the two first support members 62 associated with the primary orifice 24a are in axial support respectively in the two axial notches 64 of the folded portions 30 associated with the secondary orifice 24b, just as the two first bearing members 62 associated with the secondary orifice 24b are in axial support respectively in the two axial notches 64 of the folded plate portions associated with the primary orifice 24a.

Alternatively or simultaneously, the shoulders 66 on the side edges of the folded portions 30 are in axial support two by two. In other words, a shoulder 66 present on a side edge of one of the folded portions 30 associated with one of the two plates 20a, 20b is in axial support on a shoulder 66 present on an adjacent side edge of the one of the folded portions 30 associated with the other of the two plates 20a, 20b.

Finally, it is noted that the manufacture of the plates 20a, 20b shown in FIGS. 13 to 15 is carried out in an identical or similar manner to that exposed in relation to FIG. 7. In particular, as shown schematically in FIG. 16, a raw plate 200 is cut along cutting lines 50 revealing each of the two portions of plate 300 to be folded in association with one of the through holes of this plate. The cut lines 50 also reveal the first support members 62, the axial notches 64, as well as the shoulders 66.

Of course, various modifications can be made by those skilled in the art to the storage basket 1 which has just been described, solely by way of indicative examples and within the limit of the scope defined by the appended claims. In particular, all the characteristics disclosed in the context of a given embodiment can be applied to the other embodiments, without departing from the scope of the invention.

Claims (19)

Storage basket (1) for radioactive materials (2), the basket being intended to be arranged in a packaging (100) for transporting and/or storing radioactive materials, the basket defining one or a plurality of housings (4 ) each intended to receive radioactive materials (2), the housings (4) being parallel to each other and each extending along a housing axis (8) parallel to a central longitudinal axis (6) of the basket, the latter comprising:
- a plurality of transverse plates (20) distributed along the central longitudinal axis (6) of the basket, each transverse plate (20) comprising a main plate portion (26) oriented orthogonally to the central longitudinal axis (6) and having one or a plurality of passage orifices (24) intended for the radioactive materials (2) to pass through;
characterized in that at least one passage orifice (24) of at least one of the transverse plates (20) has, on the main plate portion (26), an orifice contour (32) from which extends at least one folded heat transfer plate portion (30), projecting axially from the main plate portion (26). Basket according to claim 1, characterized in that it comprises means for axial spacing between the main plate portions (26) of at least two directly consecutive transverse plates (20). Basket according to Claim 2, characterized in that for at least one set (60) of two directly consecutive transverse plates (20), the means of axial spacing between the main plate portions comprise at least one folded plate portion (30 ) belonging to at least one of the two transverse plates (20) of this assembly (60). Basket according to Claim 2 or Claim 3, characterized in that for at least one set (60) of two directly consecutive transverse plates (20), the means of axial spacing between the main plate portions comprise at least one portion of folded plate (30) belonging to one of the two transverse plates (20) of this set, as well as at least a portion of folded plate (30) belonging to the other of the two transverse plates (20) of this set ( 60). Basket according to claim 4, characterized in that for at least one set (60) of two directly consecutive transverse plates (20a, 20b), among which a primary transverse plate (20a) and a secondary transverse plate (20b), the means of axial spacing between the main plate portions (26) comprise at least one folded plate portion (30) associated with one of the orifices of the primary plate, called primary orifice (24a), as well as at least one portion folded plate (30) associated with one of the orifices of the secondary plate, said secondary orifice (24b), the primary and secondary orifices (20a, 20b) being aligned along the housing axis (8) of the housing associated with said primary and secondary orifices. Basket according to any one of Claims 3 to 6, characterized in that for at least one set of two directly consecutive transverse plates (20), the means of axial spacing between the main plate portions comprise several folded plate portions ( 30) associated with several orifices (24) of at least one of the two transverse plates (20) of this set, and preferably at least one, and even more preferably two folded plate portions (30) associated with each orifice (24) of at least one of the two transverse plates (20) of this set, and preferably at each orifice (24) of each of these two transverse plates (20). Basket according to any one of the preceding claims, characterized in that it comprises at least one set (60) of two directly consecutive transverse plates (20), corresponding respectively to two plates of identical design, facing one another. other, and being offset by 90 ° relative to each other along the central longitudinal axis (6) of the basket. Basket according to claim 7, characterized in that it comprises a plurality of sets (60) stacked along the central longitudinal axis (6) of the basket, said sets (60) being arranged back to back. Basket according to Claim 1 or Claim 2, characterized in that the axial spacing means comprise spacing elements (42) attached between the main plate portions (26), preferably spacers. Basket according to claim 9, characterized in that for two directly consecutive transverse plates (20) whose main portions (26) are spaced from each other by said added spacing elements (42), the spacing distance distance (DE) between the two main plate portions (26) is strictly greater than the axial projection distance (DA) of each folded plate portion (30) projecting between these two main portions (26). Basket according to any one of the preceding claims, characterized in that for at least one of the passage orifices (24) of at least one of the transverse plates (20), and preferably for each of these orifices (24) of each of the plates (20), the cumulative surface of the folded plate portion(s) (30) associated with the passage orifice (24) corresponds to at least 80% of the surface of this orifice delimited by its outline (32). Basket according to any one of the preceding claims, characterized in that at least one housing of the basket (4) is defined by a sleeve (44) produced in one piece or from several axial plates passing through several passage orifices (24) aligned along the corresponding housing axis (8) and belonging to different transverse plates (20) of the basket, at least one of the folded plate portions (30) associated with each of said aligned passage orifices (24) being in contact with an outer surface of the liner (44). Basket according to any one of the preceding claims, characterized in that at least one of the transverse plates (20) is a sheet made of an aluminum-based material, and/or with a thickness of less than 1 cm. Basket according to any one of the preceding claims, characterized in that the orifice contour (32) of at least one passage orifice (24) of at least one transverse plate (20) has a plurality of contour sections succeeding each other, preferably four contour sections succeeding each other, among which two first contour sections (32a) facing each other, and two second contour sections (32) facing each other. Basket according to Claim 14, characterized in that the two first contour sections (32a) are free, and in that a folded heat transfer plate portion (30) extends from at least one of the two second contour sections (32b), and preferably from each of the two second contour sections. Basket according to Claim 15 combined with Claim 5, characterized in that the primary orifice (24a) has an outline whose first two outline sections (32a) are free, and for which a portion of folded heat transfer plate ( 30) extends from each of the two second contour sections (32b),
in that the secondary orifice (24b) has a contour of which the two first contour sections (32a) are free, and for which a portion of folded heat transfer plate (30) extends from each of the two second sections of outline (32b),
in that the first contour sections (32a) each have a first support member (62) projecting transversely towards the inside of the associated passage orifice (24a, 24b),
in that each folded plate portion (30) comprises on the one hand a free axial end (46) whose edge has an axial notch (64), and on the other hand two opposite side edges each having a shoulder (66) axially oriented,
in that each portion of folded plate (30) associated with the primary orifice (24a) projects axially in the direction of the secondary orifice and vice versa, so that:
- the two first support members (62) associated with the primary orifice (24a) are in axial support respectively in the two axial notches (64) of the folded plate portions (30) associated with the secondary orifice (24b) , just as the two first support members (62) associated with the secondary orifice (24b) are in axial support respectively in the two axial notches (64) of the folded plate portions (30) associated with the primary orifice (24a), and/or
- the shoulders (66) on the side edges of the folded plate portions (30) associated with the two primary and secondary orifices (24a, 24b) are in axial support in pairs. Basket according to any one of the preceding claims, characterized in that each folded plate portion (30) extends over the entire length of its associated contour section (32b). Basket according to any one of the preceding claims, characterized in that each folded plate portion (30) has a free axial end (46) the edge of which is parallel or substantially parallel to the contour section (32b) from which extends this folded plate portion. Method of manufacturing a storage basket according to any one of the preceding claims, characterized in that it comprises a step of producing at least one of the transverse plates (20) including at least one passage orifice ( 24) has, on the main plate portion (26), an orifice contour (32) from which extends at least one folded heat transfer plate portion (30), projecting axially from the portion main plate (26), this production step being implemented starting from a raw plate (200) first cut to reveal each portion of the plate to be folded (300) on the main portion of the plate, then by bending so as to obtain each portion of folded heat transfer plate (30).