Fuel corrosion processes under waste disposal conditions

X-ray photoelectron spectroscopy study of anodically oxidized SIMFUEL surfaces

Pyrolusite (β-MnO2(s)) was used to assess the influence of a competitive electron acceptor on the kinetics of reduction of aqueous uranyl carbonate by a dissimilatory metal-reducing bacterium (DMRB), Shewanella putrefaciens strain CN32 The enzymatic reduction of U(VI) and β-MnO2(s) and the abiotic redox reaction between β-MnO2(s) and biogenic uraninite (UO2(s)) were independently investigated to allow for interpretation of studies of U(VI) bioreduction in the presence of β-MnO2(s) Uranyl bioreduction to UO2(s) by CN32 with H2 as the electron donor followed Monod kinetics, with a maximum specific reduction rate of 110 μM/h/108 cells/mL and a half-saturation constant of 370 μM The bioreduction rate of β-MnO2(s) by CN32 was described by a pseudo-first-order model with respect to β-MnO2(s) surface sites, with a rate constant of 792 × 10-2 h-1/108 cells/mL Uraninite that precipitated as a result of microbial U(VI) reduction was abiotically reoxidized to U(VI) by β-MnO2(s), with concomitant reduction to Mn

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Modeling the Inhibition of the Bacterial Reduction of U(VI) by β-MnO2(s)

The effect of pH on the anodic dissolution of SIMFUEL (UO2)

In this review the kinetics and mechanism of oxidative dissolution of UO2(s), mainly under conditions of relevance for the safety assessment of a deep geological repository for spent nuclear fuel, ...

S. Sunder

Papers

Anodic oxidation and dissolution of CANDU fuel (UO2) in slightly alkaline sodium perchlorate solutions