Patent ID: 8437444
Filing Date: 2013-05-07
Classification: G21F

Abstract:
1. A canister that is capable of storing and transporting spent nuclear fuel, the canister comprising: a canister shell that includes an open end; a closure lid that is inserted within the open end of the canister shell, the closure lid having a sidewall, an upper portion having a first outer lateral circumference and a lower portion having a second outer lateral circumference, the first outer lateral circumference less than the second outer later circumference; a first weld layer disposed in a weld area, the first weld layer having welds between the closure lid and the canister shell at the top of the lower portion of the closure lid, the first weld layer being configured to close the closure lid onto the canister as a first seal to the canister; a second weld layer disposed above the first weld layer, the second weld layer having welds between the closure lid and the canister shell and disposed on the first weld layer, the second weld layer being configured to close the closure lid onto the canister as a second seal to the canister; and a seal ring that is disposed above the second weld layer and between the canister shell and the upper outer circumference of the sidewall of the canister lid, a lower portion of the seal ring being placed substantially adjacent to the second weld layer, a top surface of the seal ring being substantially aligned and welded to the top surface of the closure lid and a top end of the canister shell, the seal ring being configured to close the closure lid onto the canister as a second seal to the canister.