Patent Number: 
Section: claims

1. A basket for transport and/or storage packaging of radioactive materials, the basket comprising:at least one internal partition comprising at least one wall having two opposite lateral surfaces, andat least one peripheral partition,the internal partition delimits at least partially on either side of the same two cells intended to house the radioactive materials, the peripheral partition participating with the internal partition in delimiting the cells,the peripheral partition comprising at least one housing accommodating one end of the at least one wall, the housing comprising two opposite lateral housing surfaces and a bottom bringing together the two lateral housing surfaces,wherein the basket comprises a fastener configured to press at least one of the lateral wall surfaces against at least one of the lateral housing surfaces and to tighten the lateral wall surface against the lateral housing surface. 2. The basket according to claim 1, wherein the internal partition comprises two parallel walls separated by a spacing, each of the walls having a lateral external surface and a lateral internal surface,wherein at least one of the lateral external surfaces is configured to be pressed against one of the lateral housing surfaces by the fastener, orwherein at least one of the lateral internal surfaces is configured to be pressed against one of the lateral housing surfaces by the fastener. 3. The basket according to claim 1, wherein the fastener generates a pinching strain of the wall end of the internal partition between:said lateral housing surface against which the wall is pressed, called a first pinching surface, anda second pinching surface facing the first pinching surface. 4. The basket according to claim 3, wherein the end of the at least one wall is pinched in the housing, by being in mechanical contact with both lateral housing surfaces. 5. The basket according to claim 1, wherein the peripheral partition comprises an internal surface oriented inwardly of the basket and participating in delimiting the cells,wherein the housing opens to the internal surface, such that at least one of the lateral housing surfaces is orthogonal to the internal surface. 6. The basket according to claim 1, wherein a value ratio of a thickness of at least one wall to a surface length of wall lateral surface contact with one of the lateral housing surfaces, in a transverse cross-sectional plane of the basket, is between 0.2 and 1. 7. The basket according to claim 1, wherein the internal partition is in mechanical contact with the peripheral partition on at least ¾ the height of the peripheral partition. 8. The basket according to claim 7, wherein the internal partition is in mechanical contact with the peripheral partition over substantially the entire height of the basket. 9. The basket according to claim 1, comprising a plurality of internal partitions formed by stacked interlaced structural sets. 10. The basket according to claim 1, wherein the fastener comprises a plurality of tightening elements spaced from each other along the height of the basket. 11. The basket according to claim 10, wherein each fastener is configured to exert a tightening force the value of which is independent of that of the other tightening elements. 12. The basket according to claim 1, wherein the fastener is configured to be tightened/untightened from outside the basket. 13. The basket according to claim 1, wherein the fastener comprises a screw and a nut configured to cooperate with the screw. 14. The basket according to claim 13, wherein the fastener comprises at least one jaw, wherein the jaw is separation biased by the nut to press at least one of the lateral wall surfaces against at least one of the lateral housing surfaces. 15. The basket according to claim 1, wherein the fastener comprises at least one first tilted surface, the peripheral partition or the wall end comprising at least one second tilted surface complementary to the first tilted surface and configured to be supported on the first tilted surface. 16. The basket according to claim 2, wherein the fastener comprises at least one elastic tightening element located in the spacing, the elastic tightening element tending to press at least one of the lateral external surfaces against one of the lateral housing surfaces. 17. A transport and/or storage pack for radioactive materials, comprising a packaging and a lid closing the packaging, the packaging housing a basket according to claim 1. 18. The transport and/or storage pack according to claim 17, wherein the radioactive material comprises nuclear fuel assemblies. 19. A method for assembling a basket the basket, the basket comprising:at least one internal partition comprising at least one wall having two opposite lateral surfaces, andat least one peripheral partition,the internal partition delimits at least partially on either side of the same two cells intended to house the radioactive materials, the peripheral partition participating with the internal partition in delimiting the cells,the peripheral partition comprising at least one housing accommodating one end of the at least one wall, the housing comprising two opposite lateral housing surfaces and a bottom bringing together the two lateral housing surfaces,wherein the basket comprises a fastener configured to press at least one of the lateral wall surfaces against at least one of the lateral housing surfaces and to tighten the lateral wall surface against the lateral housing surface,the method comprising, after a step of accommodating the end of the wall in the housing, a step of pressing at least one of the lateral wall surfaces against at least one of the lateral housing surfaces, such that the wall is located between the fastener and the lateral housing surface against which the lateral wall surface is pressed. 20. The basket according to claim 1, wherein the fastener does not contact the at least one internal partition.