Thermal Performance analysis of Repository Codisposal Waste Packages containing Aluminum-Clad Spent Nuclear Fuel

摘要

The leading codisposal waste package (WP) design proposes that a central DOE Aluminum-clad Spent Nuclear Fuel (Al-SNF) canister be surrounded by five defense waste process facility (DWPF) glass log canisters, and placed into a WP in the Mined Geologic Disposal System (MGDS). Two waste form options are being considered for the DOE Al-SNF disposition using the codisposal WP design configuration. They are the direct and the melt-dilute SNF forms. For the direct form option, a number of Al-SNF assemblies are to be packed directly without any change of physical forms or chemical isotopes in a DOE Al-SNF canister. For the melt-dilute form option, a number of the SNF assemblies are melted and diluted to be emplaced in the central DOE Al-SNF stainless steel canister, which result in a SNF storage canister containing uranium-aluminum alloy ingots. For the present analysis, a SNF canister is estimated to be filled to 90% of the canister volume with an uranium-aluminum alloy ingot.