Speaker
Prof.
Kastriot Spahiu
(SKB, Stockholm, Sweden and Chalmers University of Technology, Gothenburg, Sweden)
Description
Our experimental data indicate that the hydrogen effect is a complex phenomenon and has several aspects. The decomposition of hydrogen peroxide on the surface of SIMFUEL is followed by the reaction of the produced hydroxyl radicals with hydrogen to give water, or their reaction with H2O2 to give O2. Only a very small part of the initial hydrogen peroxide (<0.02%) causes oxidative dissolution of the SIMFUEL producing U(VI) in solution.
In another study, the leaching of a high Pu content(~24%) un-irradiated MOX fuel was investigated under anoxic conditions(Ar) and in the presence of 1 MPa D2(g). The results obtained under 1MPa deuterium indicate a complete absence of oxidative dissolution during the first 29 days. Isotopic D/H analysis of the water sampled in the autoclave and analysis of the gas atmosphere of the autoclave makes possible to draw conclusions about the fate of radiolytic oxidants.
Primary author
Prof.
Kastriot Spahiu
(SKB, Stockholm, Sweden and Chalmers University of Technology, Gothenburg, Sweden)
Co-authors
Mrs
Lovisa Bauhn
(Chalmers University of Technology,Gothenburg, Sweden)
Mr
Niklas Hansson
(Chalmers University of Technology, Gothenburg, Sweden)
