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Fusion Science and Technology
Latest News
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.
T. Nakamura, K. Hirata, T. Yamanishi, K. Okuno, Y. Naruse
Fusion Science and Technology | Volume 21 | Number 2 | March 1992 | Pages 942-947
Material; Storage and Processing | doi.org/10.13182/FST92-A29872
Articles are hosted by Taylor and Francis Online.
Experimental study for hydrogen isotope separation by thermal diffusion has been performed by using a single column and four interlinked columns. The dependence of the separation factor Q on the pressure was examined for single column operation with H-D (H2/ D2 ≈ 52/48), H-T (H2 / T2 ≈ 50/50) and D-T (D2 / T2 ≈ 80/20) systems where the hot wire temperature selected was 1273K. The optimum pressure observed was 93kPa for H-T, and 106kPa for H-D and D-T systems. The four columns were interlinked to function as a single column under the total reflux mode, and were operated with H-T at the optimum pressure observed in the single column experiments. The composition distributions experimentally observed were in close agreement with calculated results of the single column operation which is four times as high as each column.
