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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.
L. Bromberg, P. Titus
Fusion Science and Technology | Volume 30 | Number 3 | December 1996 | Pages 1199-1203
Fusion Magnet Systems | doi.org/10.13182/FST96-A11963110
Articles are hosted by Taylor and Francis Online.
To improve scheduled and unscheduled maintenance of the nuclear island, methods of supporting the out-of-plane TF loads so as not to interfere with maintenance operation would be highly desirable. Even if the toroidal field coil were extended outwardly to allow for maintenance of toroidally segmented modules, ideally there should not be structures in between coils in the outboard legs of the toroidal field coil. The number of these modules is the same as the number of toroidal field coils, and therefore one and only one module is removed between a pair of adjacent TF coils. Structural analyses of several cases that have the common feature of avoiding material in between the outer legs of the TF coil are presented in this paper. The implications on the structural amount of material required are investigated.