H2 inhibition of radiation induced dissolution of spent nuclear fuel
2009 (English)In: Journal of Nuclear Materials, ISSN 0022-3115, E-ISSN 1873-4820, Vol. 383, no 3, 226-230 p.Article in journal (Refereed) Published
In order to elucidate the effect of noble metal clusters in spent nuclear fuel on the kinetics of radiation induced spent fuel dissolution we have used I'd particle doped UO2 pellets. The catalytic effect of Pd particles on the kinetics of radiation induced dissolution Of UO2 during gamma-irradiation in HCO3- containing solutions purged with N-2 and H-2 was studied in this work. Four pellets with Pd concentrations of 0%, 0.1%, 1% and 3% were produced to mimic spent nuclear fuel. The pellets were placed in 10 mM HCO3- aqueous solutions and gamma-irradiated, and the dissolution of UO22+ was measured spectrophotometrically as a function of time. Under N-2 atmosphere, 3% I'd prevent the dissolution of uranium by reduction with the radiolytically produced H-2, while the other pellets show a rate of dissolution of around 1.6 x 10(-9) mol m(-2) s(-1). Under H-2 atmosphere already 0.1% Pd effectively prevents the dissolution of uranium, while the rate of dissolution for the pellet without Pd is 1.4 x 10(-9) mol m(-2) s(-1). It is also shown in experiments without radiation in aqueous solutions containing H2O2 and O-2 that epsilon-particles catalyze the oxidation of the UO2 matrix by these molecular oxidants, and that the kinetics of the catalyzed reactions is close to diffusion controlled.
Place, publisher, year, edition, pages
2009. Vol. 383, no 3, 226-230 p.
WASTE-DISPOSAL CONDITIONS, OXIDATIVE DISSOLUTION, AQUEOUS-SOLUTION, URANIUM-DIOXIDE, UO2, KINETICS, H2O2, REDUCTION, CORROSION, MECHANISM
IdentifiersURN: urn:nbn:se:kth:diva-9369DOI: 10.1016/j.jnucmat.2008.09.021ISI: 000261905600004ScopusID: 2-s2.0-56349130830OAI: oai:DiVA.org:kth-9369DiVA: diva2:113656
QC 20100908. Uppdaterad från submitted till published (20100908).2008-10-232008-10-232011-05-11Bibliographically approved