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Field tests have been performed to demonstrate the feasibility of emplacement of precompacted clay buffer materials in a granitic medium. The Silord site was selected because it was possible, using the raise boring technique, to drill pits of 30 m depth minimum between two pre-existing galleries. Two pits of 37 m depth were drilled and characterised in detail: mean diameter and vertical deviation measurements, valuation of the surface condition (rugosity) and cracking. The most regular pit was selected for the feasibility test itself. In parallel, manufacturing and handling techniques for the engineered barrier were improved. The bricks were made from a powdered mixture of clay and 10 % sand and formed the barrier which was installed in the pit using iron baskets. The technique used was compacting by uniaxial pressing at 64 MPa. Twenty eight baskets containing the engineered barrier were fabricated and taken to Fanay-Silord. The baskets were stacked up in the pit, without any difficulty, with a mean radial gap of 1.6 cm (for a pit mean diameter of 99.3 cm). Three simulated Cogema waste containers were then satisfactorily installed.

Additional information

Authors: JORDA M, CEA/DCC/DSD, Fontenay-aux-Roses (FR);LAJUDIE A, CEA/DCC/DSD, Fontenay-aux-Roses (FR);GATABIN C, CEA/DCC/DSD, Fontenay-aux-Roses (FR);ATABEK R, CEA/DCC/DSD, Fontenay-aux-Roses (FR)
Bibliographic Reference: EUR 14185 FR (1992) 53 pp., FS, ECU 7.50
Availability: (2)
ISBN: ISBN 92-826-4642-4
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