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Abstract

The thermal simulation of drift emplacement is a large scale test being performed in the Asse salt mine in Germany, to demonstrate the emplacement of spent fuel in drifts and to study the thermomechanical effects with this way of disposal. This direct disposal provides the packaging of the fuel rods in self-shielding Pollux casks; in this test the spent fuel is simulated by electrical heaters. The remaining volume of the drifts is backfilled with crushed salt. The required compaction of the backfill to a solid rock is achieved by the gradual closure of the backfilled drifts due to convergence. As a result of the heat from the casks the creep deformations of the rock salt and thus the compaction of the backfIll are accelerated terminating in a complete sealing of the waste canisters in the rock salt. Gas generation occurs by the corrosive reaction of water with the metallic casks or by radiolytic impact of gamma radiation. Moreover, small amounts of gas and water contained in rock salt can be released due to heat-up of the salt. In this report, results are presented on the investigations on compaction behaviour of the crushed salt backfill and the gas release through this backfill.

Additional information

Authors: SCHNEEFUSS J, Forschungszentrum für Umwelt und Gesundheit GmbH (GSF), Institut für Tieflagerung, Braunschweig (DE);FEDDERSEN H-K, Forschungszentrum für Umwelt und Gesundheit GmbH (GSF), Institut für Tieflagerung, Braunschweig (DE);JOCKWER N, Forschungszentrum für Umwelt und Gesundheit GmbH (GSF), Institut für Tieflagerung, Braunschweig (DE);DROSTE J, Forschungszentrum für Umwelt und Gesundheit GmbH (GSF), Institut für Tieflagerung, Braunschweig (DE)
Bibliographic Reference: EUR 16730 EN (1996) 47pp., FS, ECU 7.00
Availability: Available from the (2)
ISBN: ISBN 92-827-5635-1
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