2008
DOI: 10.1016/j.jnucmat.2008.04.018
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On the effects of fission product noble metal inclusions on the kinetics of radiation induced dissolution of spent nuclear fuel

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Cited by 56 publications
(47 citation statements)
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“…On the basis of this observation a reaction where the noble metal inclusions catalyze the reduction of U(VI) to U(IV) by H 2 on the surface of the pellet was postulated [71]. This reaction was later verified using Pd particle-doped UO 2 pellets exposed to H 2 O 2 and H 2 [59]. In these experiments, Pd-doped pellets with different Pd concentrations were exposed to aqueous solutions containing H 2 O 2 and HCO 3 − at different partial pressures of H 2 .…”
Section: Influence Of Groundwater Componentsmentioning
confidence: 90%
See 1 more Smart Citation
“…On the basis of this observation a reaction where the noble metal inclusions catalyze the reduction of U(VI) to U(IV) by H 2 on the surface of the pellet was postulated [71]. This reaction was later verified using Pd particle-doped UO 2 pellets exposed to H 2 O 2 and H 2 [59]. In these experiments, Pd-doped pellets with different Pd concentrations were exposed to aqueous solutions containing H 2 O 2 and HCO 3 − at different partial pressures of H 2 .…”
Section: Influence Of Groundwater Componentsmentioning
confidence: 90%
“…UO 2 doped with α-emitting nuclides [51][52][53][54][55][56][57][58] has been used to mimic the radiation field from spent nuclear fuel older than 1000 years. UO 2 has been doped with Pd particles [59,60] to mimic the effect of ε-phase particles (fission products forming noble metal inclusions in the fuel matrix) and with rare earth oxides [61][62][63] to mimic the effect of fission products forming oxides in the fuel matrix. SIMFUEL is a more complex material produced to mimic some of the chemical properties of spent nuclear fuel.…”
Section: Kinetics Of Surface Reactionsmentioning
confidence: 99%
“…The possible reasons for the enhanced dissolution of irradiated fuels are expected to be, for example, the catalytic effect of noble metal fission products such as Pd on the oxidizing dissolution of UO 2 , the evolution of the effective surface area of the fuels by irradiation, or a decrease in the solid density of the fuels upon irradiation. As for the catalytic effect of noble metals, Trummer et al [17] reported that UO 2 powders containing 3 wt% of Pd dissolved five to six times faster than non-Pd powders in H 2 O 2 þ HCO 3 solution. The same effect of noble metals was also reported by Ikeda et al [18].…”
Section: Promotion Effect By Irradiationmentioning
confidence: 99%
“…Leaching experiments with SNF and UO 2 (s) samples as well as electrochemical studies in diluted Na + -Cl − -HCO 3 − / CO 3 2− solutions demonstrate clearly a hydrogen inhibition effect mediated by Ru-Pd-Rh-doping and ε-particles [133][134][135][136][137][138][139]]. An ε-particle surface mediated hydrogen effect depends on the availability of these particles and might be affected by "poisoning" of these noble metal alloys with dissolved sulfides present in the near-field, whereas a radiolytic driven hydrogen effect will be weakened by counteracting groundwater constituents, such as bromide.…”
Section: Radionuclide Release Due To Corrosion Of the Uo 2 Matrixmentioning
confidence: 99%