Radiolysis and corrosion of238Pu-doped UO2 pellets in chloride brine |
| |
Authors: | M Kelm and E Bohnert |
| |
Institution: | (1) Forschungszentrum Karlsruhe, Institut für Nukleare Entsorgung, 3640, 76021 Postfach, Karlsruhe, Germany |
| |
Abstract: | Deaerated 5 M NaCl solution is irradiated in the presence of UO2 pellets with α-radiation from238Pu. Experiments are conducted with238Pu doped pellets and others with238Pu dissolved in the brine. The radiolysis products and yields of mobilized U and Pu from the oxidative dissolution of UO2 are determined. Results found for radiolysis products and for the oxidation/dissolution of pellets immersed in Pu containing
brine are similar to results for Pu doped pellets, where the radiation chemical processes occur only in the liquid layer of
some 10 σm thickness adjacent to the pellet. The yield of radiolysis products is comparable to earlier results, that of mobilized
U from the pellets is < 1% of the total amount of oxidized species. Thus, the radiation chemical yield (G-value) for mobilized hexavalent U is < 0.01 ions/100 eV. In spite of the low radiation yield for the corrosion, the rate
of UO2dissolution is higher than expected for the concentrations of long-lived oxidizing radiolysis compounds found in the solutions. |
| |
Keywords: | α Radiolysis UO2 leaching chloride brine radiolysis products |
本文献已被 SpringerLink 等数据库收录! |
|