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Fusion Science and Technology
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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.
Ichiro Yamamoto, Susumu Hatta, Akira Kanagawa
Fusion Science and Technology | Volume 21 | Number 2 | March 1992 | Pages 977-982
Material; Storage and Processing | doi.org/10.13182/FST92-A29878
Articles are hosted by Taylor and Francis Online.
The present paper analyzes the separative performance of a “cryogenic-wall” thermal diffusion column of which the cold-wall temperature is lower than 77.35 K. Because the value of thermal diffusion factor αT for H2-HT mixture decreases in lower temperature region and is probably negative under ∼70 K, an estimated enhancement of the separation factor is not so large: the total separation factor (αβ)max of the column with rh = 0.015 cm, rc = 1.5 cm, Z = 150 cm and ΔT = 1200 K increases from ∼3.3×103( Tc = 77.35 K, Popt = ∼0.04 MPa) to ∼6.0×103( Tc = 30 K, Popt = ∼0.027 MPa) when the column is operated under the feed rate of 10 cm3(converted to the value of 0.1 MPa and 288.15 K)/min and the cut θ is 0.1.