Thermal diffusion of iodine in UO2 and UO2+x

Measurement of radiation-enhanced diffusion of La in single crystal thin film CeO2

“…Transmutation of the recycled minor actinides (Np, Am, and Cm, for example) in either LWRs or fast reactors can potentially reduce the nuclear fuel waste storage requirements by hundreds of thousands years. However, little is known regarding the behavior of minor actinides in the UO 2 fuel matrix during operation [5]. In particular, precipitation can alter the mechanical and thermal response of the fuel form.…”

Specific low temperature release of 131Xe from irradiated MOX fuel

“…Both iodine and xenon are normally almost insoluble in UO 2 matrix [14,15] (in hyperstoichiometric UO 2+x the solubility of Xe increases substantially together with its thermally activated diffusion coefficient (for T > 1300 K) [16][17][18]). Our results are in agreement with the diffusion coefficient measurements by Turnbull et al [19], showing a diffusion coefficient for iodine, D I , hundred times larger than for xenon, D Xe , at the irradiation temperature of the samples (800 K).…”

Secondary Ion Mass Spectrometry

“…106,108,109 In parallel, more fundamental studies conducted with the use of SIMS after ion implantation have made possible the calculation of diffusion coefficient values for several fission products in UO 2 . 110 Concerning the evolution of isotopic abundances, one of the most attractive features of SIMS for postirradiation examinations is the determination of local burn-up values from the measurement of rare-earth fission products, e.g. Nd isotopes, to 238 U ratios.…”