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2024 ANS Annual Conference
June 16–19, 2024
Las Vegas, NV|Mandalay Bay Resort and Casino
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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.
Takashi Kato, Kunihiro Matsui, Susumu Shimamoto, Kazuhiko Nishida, Tadaaki Honda, Kazuya Hamada, Hiroshi Tsuji, Neil Michel, Kiyoshi Yoshida
Fusion Science and Technology | Volume 30 | Number 3 | December 1996 | Pages 1253-1257
Fusion Magnet Systems | doi.org/10.13182/FST96-A11963120
Articles are hosted by Taylor and Francis Online.
One of the safety analysis for superconducting magnet system in International Thermonuclear Experimental Reactor (ITER) was carried out. The ITER cryostat will hold many superconducting magnets, such as twenty of toroidal field coils, a central solenoid coil, and seven poloidal coils. Loss of vacuum of the cryostat was considered as the worst assumption and the safety analysis of the magnets was examined when the assumption would be occurred. Accordingly, the loss of vacuum will cause the loss of thermal shield vacuum for the magnets and then a large heat transfer will be generated in the cryostat The magnet pressure and temperature will rise, bringing the magnets to quench. Such behavior was simulated by using a developed computer-aided calculation code. As a result of the calculation, a catastrophic phenomenon doesn't appear in the assumption. It is observed that a quasi-stable state, where the magnet temperature is kept to be less than 7 K, is maintained for more than 600 seconds. Thus, the magnet current can be slowly discharged like as the ordinal operation without magnet quench even in such worst assumption due to a large volume of the cryostat.