Patent ID: 6853697

Claim:
A transfer cask for transporting a canister of spent nuclear fuel from a spent nuclear fuel pool to a storage cask, the transfer cask comprising: a cylindrical body having a top surface, a bottom surface, and a cavity adapted for receiving the canister, the bottom surface comprising means for securing and unfastening a bottom lid and means for securing to a mating device, the top surface comprising means to secure a cask lid; a bottom lid, the bottom lid acting as a floor for the cavity when secured to the bottom surface; a cask lid; a bottom seal positioned between the bottom lid and bottom surface and compressed between the bottom surface of the cylindrical body and the bottom lid so as to hermetically seal a bottom of the cavity; and an annulus seal at or near the top surface of the cylindrical body and positioned between the canister and the cylindrical body when the canister is resting in the cavity.