Tie-down assembly for securing a cask containing radioactive waste to a vehicle

This patent describes an improved tie-down assembly for securing a cask to a vehicle having support beams. It comprises a plurality of cask lugs, each of which of attached to a portion of the outer wall of the cask for connecting the cask to tensioned cables which in turn are attached to the vehicle, wherein the cask lugs are formed from a material whose ratio of ultimate stress to yield stress is at least about 6 percent lower than the ratio of ultimate stress to yield stress of the material forming the portions of the outer wall of the cask so that the cask lugs will break off or pull out of the cask before they apply a force great enough to break or rupture the outer wall portions of the cask