Supplemental Task A-2,A-2A, Design of robust waste cannister. Semi-annual report

摘要

The original design for High Level Nuclear Waste cannisters anticipated a dry and oxidizing environment and stable geological conditions. For these conditions, a welded light walled cannister of type 316L austenitic stainless steel was adequate. More recently, the possibility of geological activity, has been raised, and with it the occurrence of mechanical loading, water immersion, and reducing conditions. In order to meet these new design conditions, a multi barrier containment system is proposed. An inner shell of Copper base alloy, to resist a wet, reducing environment. An outer shell of a Nickel base Chromium alloy to resist the dry oxidizing conditions. A nonconducting oxide barrier to separate the two metallic barriers.