caa a22 4500 378927116 CHVBK 20180305123620.0 cr unu---uuuuu 161128e20041101xx s 000 0 eng 10.1524/ract.92.9.603.54977 doi (NATIONALLICENCE)gruyter-10.1524/ract.92.9.603.54977 Electrochemical aspects of radiolytically enhanced UO2 dissolution [Elektronische Daten] [Bernd Grambow, Thierry Mennecart, M. Fattahi, G. Blondiaux] Experiments were performed, irradiating UO2 colloids of 3nm diameter by a 5MeV alpha beam of a cyclotron. Both the dissolution rate of these colloids and the production rate of hydrogen peroxide have been measured. The experimentally measured corrosion rate of these colloids is very similar to the corrosion rates measured for bulk UO2 samples, indicating on the one hand that similar reaction mechanism prevail and on the other hand that the UO2 colloids are well representative for bulk UO2. The results were compared with two current models for radiolytical dissolution of spent fuel. Additionally a new coupling between water radiolysis reactions and spent fuel dissolution has been established. The coupling is not anymore based on rate constants for direct reaction of oxidants with UO2, but on the electrochemical coupling of anodic dissolution reactions with cathodic reduction of molecular and radical radiolysis products. The model not only describes well the experimental data, it also allows to predict both the establishment of corrosion potentials and of fractional reaction orders with respect to oxidant concentrations. Model results can also be compared with experimental data (corrosion potential ...) using UO2 as an electrode. © 2004 Oldenbourg Wissenschaftsverlag GmbH Laboratory techniques, experiments nationallicence Analytical chemistry nationallicence Inorganic chemistry nationallicence Grambow Bernd aut Mennecart Thierry aut Fattahi M. aut Blondiaux G. aut Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 92/9-11/2004(2004-11-01), 603-609 0033-8230 92:9-11/2004<603 2004 92 ract https://doi.org/10.1524/ract.92.9.603.54977 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/ract.92.9.603.54977 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Grambow Bernd aut NATIONALLICENCE 700 1- Mennecart Thierry aut NATIONALLICENCE 700 1- Fattahi M. aut NATIONALLICENCE 700 1- Blondiaux G. aut NATIONALLICENCE 773 0- Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 92/9-11/2004(2004-11-01), 603-609 0033-8230 92:9-11/2004<603 2004 92 ract CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter