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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.
C. A. Gentile, S. Raftopoulos, P. LaMarche, M. Viola, T. Walters, M. Kalish, T. Kozub, H. Carnevale, D. Shaltis, S. Vinson, W. Walker, L. Ciebiera, R. Yager, M. Quigley, R. Meagher, C. Bunting, E. Rogers, M. Casey, R. Hawes, R. Raucci, D. Reeves, E Amarescu, M. Gibson, T. Granger, S. Langish, S. Bush, J. Langford, D. Hyatt, J. L. Anderson
Fusion Science and Technology | Volume 30 | Number 3 | December 1996 | Pages 1564-1566
Safety and Environment | doi.org/10.13182/FST96-A11963173
Articles are hosted by Taylor and Francis Online.
The Tokamak Fusion Test Reactor which is the progenitor for full D-T operating tokamaks has successfully processed > 81 grams of tritium in a safe and efficient fashion. Many of the fundamental operational techniques associated with the safe movement of tritium through the TFTR facility were developed over the course of many years at DOE tritium facilities (LANL, LLNL, SRS, Mound). In the mid 1980's The Tritium Systems Test Assembly (TSTA) at LANL began reporting operational techniques for the safe handling of tritium, and became a major conduit for the transfer of safe tritium handling technology from DOE weapons laboratories to non-weapon facilities. TFTR has built on many of the TSTA operational techniques and has had the opportunity of performing and enhancing these techniques at America's first operational D-T fusion reactor. This paper will discuss negative pressure employing “elephant trunks” in the control and mitigation of tritium contamination at the TFTR facility, and the interaction between contaminated line operations and Δ pressure control. In addition the strategy employed in managing the movement of tritium through TFTR while maintaining an active tritium inventory of < 50,000 Ci will be discussed.