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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.
F. Ono, S. Tanaka, M. Yamawaki
Fusion Science and Technology | Volume 21 | Number 2 | March 1992 | Pages 827-832
Material; Storage and Processing | doi.org/10.13182/FST92-A29851
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The sorption and desorption of tritiated water on paints , such as acryl, silicone, epoxy and fluorine types, has been studied. In dynamic adsorption and desorption experiments, tritium concentration in the chamber, in which painted metal was installed, was measured during HTO vapor charging or purging by N2+H2O. Slow desorption rate for acryl type was observed. Residual tritium not released by sweeping with N2+H2O was recovered by heating up to 800°C. Residual tritium fraction for epoxy type was found to be highest among tested. Paint membrane was used in permeation experiments of HTO vapor and liquid. Diffusivity, solubility and permeability were evaluated. Diffusivity for fluorine was largest and that for epoxy smallest. Epoxy is considered to be the most suitable paint because of its low permeability.
