The radioactive sludges formed at the bottom of high-level liquid waste (HLW) storage tanks pose challenges when HLWs are vitrified. This study aims to determine influence sludge content (enriched in Na2O, Al2O3, NiO, Fe2O3, and BaSO4) on structure properties glasses order find optimal ratio HLW during vitrification. In experiments, simulated were mixed different ratios from 0:8 4:4, with an ov...

The 129I radioactive isotope is a by-product of nuclear plants activity. Owing to its strong volatility, there currently no ideal protocol immobilize in waste borosilicate glasses. Recently, we have proposed the use high-pressure syntheses dissolve iodine various glass compositions; however, I speciation and dissolution mechanism could not be determined. We adopted an approach combining X-ray P...

Defects and heterogeneities degrade the strength of glass with different surface and subsurface properties. This study uses surface nanostructures to improve the bending strength of glass and investigates the effect of defects on three glass types. Borosilicate and aluminosilicate glasses with a higher defect density than fused silica exhibited 118 and 48 % improvement, respectively, in bending...

Article history: Received 19 August 2014 Accepted 15 September 2014 The radioisotope I, a fission product in spent nuclear fuel, has a long half-life, and can be highly mobile in the environment. Iodine K-edge X-ray absorption spectra were collected to characterize the iodine valence and coordination environment in simulated Hanford low activity waste glasses. Both iodine XANES and EXAFS data f...

To understand the influence of alkali elements on incorporation mechanisms and limit iodine in borosilicate glasses used for nuclear waste immobilization, series model with different contents (22 or 35 mol% Na2O, 22 a mixture alkalis: Na substituted by Li, K Cs) were loaded (from 1 000 to 10 ppm at. under form iodide) at 1100 °C. When was reached, iodide crystals observed (e.g., NaI). For overs...