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The environmental conditions of a deep repository and especially the chemical composition of water in the near field of containers will govern the microbial activity and the kinetics of this activity leading to gas generation. In this report several conditioning matrices for waste were studied (eg bitumen and concrete). The alpha and gamma radiolysis of the water and other organic compounds included in a radium-bearing sludge leads to hydrogen formation.
The encapsulation of ethylenediaminetetraacetic acid (EDTA) in cement induces an important effect on hydration phenomenon. Up to 1.5% content, EDTA acts as a set retarder. Beyond 1.5% the precipitation of a calcic EDTA hydrate salt is observed, plugging part of the interstitial porous volume. With time, a variation of the free water in the interstitial porous volume is observed and also the volume of radiolytic hydrogen produced. Under gamma irradiation, the presence of EDTA tends to enhance significantly the hydrogen release, the production of which depends on the conditions of storage. The leaching of EDTA and the consecutive increase of solubility of the radionuclides due to its high complex capacity is important within the frame of storage and containment requirements.

Additional information

Authors: LESSART P ET AL, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR);ROSEVEAR A ET AL, AEA Technology, Harwell Laboratory, Didcot, Oxon (GB)
Bibliographic Reference: EUR 17103 EN (1997) 165pp., FS, ECU 30.00
Availability: Available from the (2)
ISBN: ISBN 92-827-8982-9
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