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This report presents the results obtained in the optional part of the "Repository system simulation test" (RSST). The results of the compulsory part have been reported and evaluated in another publication (EUR 12544). The effects of the oxidation-reduction potential and carbonate concentration on the alterability and containment properties of R7T7 glass were investigated under semi-integral conditions, i.e. by leaching glass samples doped with 239Pu and 237Np in the presence of environmental materials (sand, clay and granite) in three different test media: - a carbonated medium obtained by adding sodium bicarbonate; - an oxidative medium with a 2-bar oxygen partial pressure; - a reducing medium with a 2-bar partial pressure of argon and 5% H(2) additive. Under the semi-integral test conditions, the normalised Np and Pu mass losses varied by less than an order of magnitude for the different test media, but the following general tendencies were observed: NL(Np){CO(2)} > NL(Np){O(2)} > NL(Np){H(2)} and NL(Pu){O(2)} > NL(Pu){CO(2)} > NL(Pu){H(2)} A large fraction of the released activity was incorporated by the environmental materials present in the conditioning cell, notably by the clay. The actinide concentrations in the interstitial water and the amounts fixed on the granite were low.

Additional information

Authors: DUSSOSSOY J L, CEA Valrô, Bagnols-sur-Cèze (FR);CHOUCHAN J L, CEA Valrô, Bagnols-sur-Cèze (FR);BOUCHON M, CEA Valrô, Bagnols-sur-Cèze (FR);VERNAZ E, CEA Valrô, Bagnols-sur-Cèze (FR)
Bibliographic Reference: EUR 13603 EN (1991) 63 pp., FS, ECU 6.25
Availability: (2)
ISBN: ISBN 92-826-2870-1
Record Number: 199111284 / Last updated on: 1994-12-02
Original language: en
Available languages: en