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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.
S.E. Grebenshchikov, G.M. Batanov, O.I. Fedyanin, D.K. Akulina, E.D. Andryukhina, V.V. Abrakov, M.S. Berezhetskii, I.S. Danilkin, N.P. Donskaya, G.A. Gladkov, N.K. Kharchev, Yu.V. Kholnov, L.M. Kolik, L.M. Kovrizhnykh, N.F. Larionova, A.A. Letunov, K.M. Likin, A.I. Meshcheryakov, Yu.I. Nechaev, A.E. Petrov, K.A. Sarksyan, I.S. Sbitnikova, E.R. Sisov, A.D. Smirnova, V.N. Sukhodol'skii, G.S. Voronov
Fusion Science and Technology | Volume 27 | Number 3 | April 1995 | Pages 270-272
Helical Systems | doi.org/10.13182/FST95-A11947085
Articles are hosted by Taylor and Francis Online.
The first results of ECH experiments in the L-2M stellarator are presented. The main goal of the experiments is to investigate the physics of ECH and plasma confinement at very high values of the volume heating power density. A current free plasma is produced and heated by extraordinary waves at the second harmonic of the electron cyclotron frequency. The experimental results are compared with the numerical simulations of plasma confinement and heating processes based on neoclassical theory using the full matrix of transport coefficients and with LHD-scaling.