Method for manufacture of a package for the transport and/or storage of nuclear material, using the phenomenon of welding shrinkage

Abstract

A method for the manufacture of a package for the transport and/or storage of nuclear materials, where the package includes an inner ferrule, an outerferrule and means of thermal conduction, and where the method includes: the construction of an essentially circular casing having at least one lengthways slit defined by two facing lengthways edges; and the welding of the facing lengthways edges, in order to obtain the outer ferrule, where this step is accomplished such that the welding shrinkage causes a compression stress of the means of thermal conduction between the ferrules, in a radial direction, and such that each welding bead only fastens the two edges which it links one on to the other.

Description

DISCLOSURE[0001]1. Technical Field[0002]The present invention relates generally to the field of the manufacture of packages for the transport and / or storage of nuclear material.[0003]In particular, the invention concerns a method for manufacture of a package for the transport and / or storage of nuclear materials, including an inner ferrule, an outer ferrule and also means for thermal conduction in contact with both the inner and outer ferrules.[0004]2. State of the Prior Art[0005]Traditionally, for the transport and / or storage of nuclear materials, storage devices, also called storage “baskets” or “racks”, are used. These storage devices, habitually cylindrical in shape and essentially circular in section, are suitable for receiving nuclear materials. The storage device is intended to be housed in the cavity of a package in order to form jointly with the latter a container for the transport and / or storage of nuclear materials, in which they are completely confined.[0006]The abovement...

AI Technical Summary

Benefits of technology

[0037]As was explained above, during the welding shrinkage observed during the assembly step, a relative movement is created in the circumferential direction between the inner surface of the casing and some or all of the second parts of contact supported on this surface, and this movement therefore results from the reduction of the diameter in the casing designed to form the outer ferrule, after welding shrinkage. This movement ensures that the means of thermal conduction are not excessively constrained in the circumferential direction, notably with a view to preventing damaging the means of radiological protection, which are preferably arranged in the patterns of the means of thermal conduction.

[0038]To facilitate this

Problems solved by technology

The installation of these means of thermal conduction in the course of the method of manufacture of the package is often lengthy and difficult, and as a consequence relatively expensive.

Since the number of thermal conduction ribs is generally very high, able to reach, for example, several tens, the method of manufacture of the package is therefore greatly hindered, in terms of assembly time, by the installation and welding o

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