Patent Number: 
Section: claims

1. A cask for containing radioactive materials comprising:a cask body comprising an opening forming a passageway into an internal storage cavity of the cask;a closure lid configured to be detachably coupled to the cask body to enclose the opening; anda locking mechanism comprising at least one first locking member and at least one second locking member, the first and second locking members slideable relative to one another to alter the locking mechanism between: (1) a first state in which the closure lid can be removed from the cask body; and (2) a second state in which the first and second locking members engage one another to prevent the closure lid from being removed from the cask body. 2. The cask according to claim 1, wherein the locking mechanism is configured so that upon the locking mechanism be altered from the first state to the second state, the closure lid and the cask body are pulled together to fluidly seal the internal storage cavity. 3. The cask according to claim 2, wherein the first and second locking members translate relative to one another when the locking mechanism is altered from the first state to the second state. 4. The cask according to claim 3, further comprising a gasket located at an interface between the cask body and the closure lid, and wherein the gasket is compressed a greater amount in the second state than in the first state. 5. The cask according to claim 1, wherein one of the first and second locking members is fixed relative to the cask body or the closure lid, and the other one of the first and second locking members is slideable relative to both the cask body and the closure lid. 6. The cask according to claim 1, wherein the locking mechanism does not include threaded fasteners in the second state. 7. The cask according to claim 1, wherein the first locking member comprises a plurality of spaced-apart first locking protrusions and the second locking member comprises a plurality of spaced-apart second locking protrusions which are selectively interlockable with the first locking protrusions to lock the lid to the cask body. 8. The cask according to claim 7, wherein the first locking member with first locking protrusions is disposed on the lid, and the second locking member comprises portions of the cask body in the storage cavity in which the second locking protrusions are fixedly disposed on the cask body. 9. The cask according to claim 8, wherein the first and second locking protrusions are each wedge shaped defining tapered first and second locking surfaces respectively, the first locking surfaces being slideably engageable with the second locking surfaces when the locking mechanism is in the second state. 10. The cask according to claim 9, wherein the first locking surfaces frictionally engage the second locking surfaces to lock the lid to the cask body via a wedging-action which draws the lid towards and against the cask body. 11. The cask according to claim 8, wherein the first locking member comprises an elongated locking bar and the first locking protrusions are disposed thereon, the locking bar being slideably disposed in a corresponding elongated guide channel formed on the lid such that the locking bar is movable relative to the lid. 12. The cask according to claim 8, wherein the first locking protrusions of the lid are insertable between and through the second locking protrusions of the cask body, and vice versa. 13. The cask according to claim 11, wherein the locking bar is movable to interlock the first and second locking protrusions without moving the lid relative to the cask body when the lid is coupled to the cask body. 14. The cask according to claim 11, wherein the locking bar is movable between a locked position in which the first and second protrusions are mutually engaged to prevent removal of the lid from the cask body, and an unlocked position in which the first and second protrusions are disengaged to allow removal of the lid from the cask body. 15. The cask according to claim 14, wherein the first locking protrusions of the lid are positioned below the second locking protrusions of the cask body when the locking bar is in the locked position. 16. The cask according to claim 11, wherein the first locking protrusions are received and slideable within an elongated and inwardly open locking recess formed in the second locking member on the cask body below the second locking protrusions. 17. The cask according to claim 1, further comprising a hydraulic or pneumatic actuator coupled to the first locking member and operable to slide the first locking member to change the locking mechanism between the first and second states. 18. The cask according to claim 17, wherein each actuator includes an extendible and retractable piston rod fixedly coupled to the first locking member. 19. The cask according to claim 5, further comprising a locking handle assembly mounted to the cask body, the locking handle assembly configured and movable to retain the locking mechanism in the second state. 20. The cask according to claim 1, wherein the cask body has an elongated rectangular cuboid configuration and the lid has a rectangular configuration. 21. The cask according to claim 20, wherein the lid comprises a plurality of first locking members and the cask body includes a plurality of second locking members slideably engageable with each other.