Add to ORKGMetal oxides added to UO2 to improve material performance during irradiation, or as burnable absorbers to control reactor energy output, affect point defect processes in UO2. The oxygen and uranium Frenkel pairs and the uranium-oxygen Schottky defects regulate the O/U ratio, which in turn influence diffusion processes in UO2. The dopants considered here include Cr2O3 and Gd2O3. Using the law of mass action to the Frenkel and Schottky defects in doped UO2, we relate O/U to the dopant concentration. Also, we find relationships between the oxygen and uranium vacancies and dopant concentration. The uranium self-diffusion coefficient is proportional to concentration of uranium vacancies in the hyper-stoichiometric region, whereas to that...