Abstract: Two of the most important performance indicators of ion exchange resin in NPP (operating exchange capacity and decontamination factor) were experimentally studied. Firstly, simulant samples were prepared using typical ions presented in primary coolant in NPP, including Cs⁺, Co²⁺, Sr²⁺, Ca²⁺, Li⁺, and etc., and then, experiments were performed with different resins and concentrations. Results indicate that: (1) the usable operating exchange capacity could reach 80% of total exchange capacity when the mass concentration of sample was at 10^-6 level, and the operating exchange capacity was increased along with the higher concentration of sample. (2) The cross-linkage had appreciable effect on operating exchange capacity. (3) Comparing with a single processing bed, multi-beds in series demonstrates an obvious increase indecontamination factor (DF) .

Key words: nuclear power plant, ion exchange, resin