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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.
T. Kunugi, M. Akiba, M. Ogawa, H. Ise, S. Yamazaki
Fusion Science and Technology | Volume 21 | Number 3 | May 1992 | Pages 1863-1867
Plasma-Facing Component | doi.org/10.13182/FST92-A29990
Articles are hosted by Taylor and Francis Online.
Several numerical codes were developed and used to evaluate the erosion thickness of the plasma facing wall. Some discrepancies of the results using the existing codes are pointed out. It is very important to understand the reason of the discrepancies. The analytical studies were performed to find the sensitivity of some factors on the results, such as boundary conditions, evaporation models and thermal properties. It was found that the temperature dependency effects of thermal conductivity and vapor pressure strongly affected the erosion results. Unfortunately, the results of this study cannot sufficiently explain the discrepancies. We would like to emphasize the necessity of the verification of the existing codes and numerical models, and the physical understanding.