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This report summarises the work of the Engineering Studies Task Group (ESTG) of the Seabed Working Group. During its five year study of the subseabed disposal of high level radioactive waste, the ESTG has performed design studies of emplacement systems, costed them, and estimated operational reliabilities. The ESTG has also developed mathematical models for important physical and engineering processes, and has performed a large number of laboratory tests, sea trials, and in situ experiments for the purpose of understanding the emplacement environment and developing the specialised equipment necessary for emplacement. After preliminary study of numerous methods for the burial of wastes beneath the seafloor, the ESTG decided to focus its attention on two systems. The first would emplace a 450 m column of waste packages in predrilled holes 750 m deep. The second method would use free falling gravity penetrators launched from a disposal ship to embed waste packages about 50 m below the seafloor in an array that separated each by an average of 180 m from its neighbours. Desktop studies of each system covered all aspects, from the general configuration and functions of the port facilities through transport to the ocean site, emplacement operations, and post emplacement behaviour of the waste packages. Cost and reliability studies were similarly broad.

Additional information

Authors: HICKERSON J, Sandia National Laboratories (US);FREEMAN T J, Building Research Establishment (GB);BOISSON J Y, CEA, Saclay (FR);GERA F, JRC Ispra (IT);MURRAY N, Ismes, Roma (IT);NAKAMURA H, IAEA, Tokyo (JP);NIEUWENHUIS J D, Delft Geotechnics (NL);SCHALLER K H, CEC Bruxelles (BE)
Bibliographic Reference: Report: SAND87-2223 UC 70 EN (1988)
Availability: Available from Sandia National Laboratories, Albuquerque, New Mexico 87185 and Livermore, California 94550 (US)
Record Number: 198911088 / Last updated on: 1994-12-01
Original language: en
Available languages: en
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