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Retrieval of nuclear waste canisters from a borehole
Borehole disposal of spent nuclear fuel (SNF) and high-level waste (HLW) uses off-the-shelf directional drilling technology developed and commercialized by the oil and gas sectors. It is a technology that has been gaining traction in recent years in the nuclear industry. Disposal can be done in one or more boreholes (including an array) drilled into suitable sedimentary, igneous, or metamorphic host rocks. Waste is encapsulated in specialized corrosion-resistant canisters, which are placed end to end in disposal sections of relatively small-diameter boreholes that have been cased and fluid-filled. After emplacement, the vertical access hole is plugged and backfilled as an engineered barrier.
Klaus Janberg, Harry Spilker
Nuclear Technology | Volume 121 | Number 2 | February 1998 | Pages 136-147
Technical Paper | German Direct Disposal Project | doi.org/10.13182/NT98-A2826
Articles are hosted by Taylor and Francis Online.
In Germany, progress has been made in the development of a cask system for final disposal of spent fuel. The requirements for a final disposal cask and the planning requirements for a final repository are discussed, and a cask system is described that meets these requirements. Besides the description of the cask system and the planned inventory, the results of the shielding, criticality, and thermal calculations are described, as well as the results of the drop tests that have been performed with the cask. As a further development, a consolidated spent-fuel canister is described.
