Abstract
In the present study, the phase diagrams for zirconium-oxygen-hydrogen ternary system were assessed between 573.15K and 1, 473.15K by means of CALPHAD technique. The calculated ternary isothermal section of zirconiumoxygen-hydrogen system at 973.15K was in good agreement with the experimental diagram. The calculated and experimental Sieverts' constants also accorded well. Isothermal sections of the other temperatures were also obtained, and drastic shifts of phase boundaries were prospected. From the zirconium (with hydrogen)-oxygen pseudo binary phase diagrams, it was predicted that dissolved hydrogen let the oxygen content for prior-β phase increase, and that the zirconium based fuel cladding became less ductile by the addition of hydrogen.
