| 초록 |
The coverage and temperature dependence of H2O adsorption on fuel cladding is studied using synchrotron-based high-resolution photoemission spectroscopy (HRPES). Before H2O adsorption, it is confirmed that Zr 3d, O 1s, C 1s, and Sn 3d HRPES profiles from fuel cladding. From analysis of these results, we determine the compositions of O2−, hydroxyl OH−, chemisorbed H2O, zirconium carbide, adventitious carbon, Sn metal, and SnO2 of fuel cladding surface. After deposition of H2O molecules on fuel cladding, the relative proportion of zirconium metal decreases, whereas that of the total zirconium oxides increases. This is indicating that there should be the reaction between H2O and the zirconium metal in fuel cladding. On annealing fuel cladding with 1000 L H2O on at 300 °C, Zr2O3 and ZrO2 decompose, and the oxygen diffuses into the bulk. |
