Abstract: Directed at the waste cake floating problem in the process of cement immobilization of radioactive waste in a nuclearpower plant, an anti-floating device was designed. And a mathematical model wasalso established to analyze the relationship between the length of cake and theloading ratio of the repackaging drum. With the current process data as input,the calculation provides a basis for selection of 320 L drum, with different block slice length, for repackaging. The safe loading interval of such a kind of repackaging drum is then calculated, which resulted in a Table of Optimized Safe Loading Interval for Waste Cakes. The optimization of this loading operation canbe theoretically based on.

Key words: Radioactive waste, Cement immobilization, Anti-floatingdevice, Safe loading interval