Packaging for transporting and/or storing radioactive materials, including improved means for attaching a shock-absorbing cover
The invention relates to a packaging for transporting and/or storing radioactive materials, comprising a packaging body extending along a longitudinal direction, and further including at least one shock-absorbing cover mounted on one of both longitudinally opposite ends of the packaging body, the absorbing cover comprising attaching portions ( 44 ) on said packaging body, each attaching portion defining a clearing hole ( 58 ) through which an element ( 24 ) screwed in the packaging body passes. According to the invention, the attaching portion ( 44 ) has a deformable area ( 54 ) which, in the case of an outer bias on the absorbing cover leading to a contact strain between the screwed element ( 24 ) and the clearing hole ( 58 ), is designed to plastically deform.
1. Packaging ( 1 ) adapted to contain radioactive materials, comprising a packaging body ( 8 ) extending along a longitudinal direction and further comprising two longitudinally opposite ends of the packaging body, said packaging further including at least one shock-absorbing cover ( 22 ) mounted on one of the longitudinally opposite ends of the packaging body, said absorbing cover comprising attaching portions ( 44 ) in contact with said packaging body, each attaching portion defining a clearing hole ( 58 ), said packaging further including at least one screwed element ( 24 ) having a bearing head with a diameter larger than a diameter of the clearing hole and a shaft which passes through said clearing hole and is screwed into said packaging body,
wherein at least one of said attaching portions ( 44 ) has a deformable area ( 54 ) adjacent to an empty area that is provided along the shaft of the at least one screwed element,
wherein in case of an outer bias on the absorbing cover ( 22 ) leading to a contact strain between said screwed element ( 24 ) and the clearing hole ( 58 ), the deformable area is adapted to plastically deform and expand at least partially into the empty area.
2. The packaging according to claim 1 , wherein said deformable area ( 54 ) extends on an angular sector ( 70 ) around the screwed element ( 24 ), at least part of this angular sector being oriented towards the outside of the cover.
3. The packaging according to claim 2 , wherein said deformable area ( 54 ) has several elements ( 54 ′) angularly spaced from each other on said angular sector ( 70 ).
4. The packaging according to claim 1 , wherein a thickness of said deformable area ( 54 ) along the direction of the screwed element ( 24 ) extends over less than than the height of said clearing hole ( 58 ).
5. The packaging according to claim 4 , wherein said deformable area assumes the shape of a ligament of material ( 54 ) located flush with a slit or a groove ( 60 ).
6. The packaging according to claim 5 , wherein said slit or groove ( 60 ) opens onto a same surface as the one onto which said clearing hole ( 58 ) opens.
7. The packaging according to claim 6 , wherein said ligament of material ( 54 ) is annular and internally carries a jacket ( 56 ) defining said clearing hole ( 58 ).
8. The packaging according to claim 4 , wherein said deformable area is a part ( 54 ) protruding radially inward in the direction of the screwed element ( 24 ), said protruding part ( 54 ) partially defining said clearing hole ( 58 ).
9. The packaging according to claim 1 , wherein said attaching portion ( 44 ) is formed integrally with a bottom ( 28 ) of the absorbing cover ( 22 ).
10. The packaging according to claim 1 , wherein said packaging body ( 8 ) includes a lid ( 11 ), a bottom ( 9 ) remote from the lid along said longitudinal direction, as well as a packaging side body ( 10 ) connecting the bottom and the lid.
11. The packaging according to claim 1 , wherein each attaching portion ( 44 ) comprises at least one part in contact with the shaft.