The Ag-containing material used in core control rods and primary loop system of pressurized water reactor(PWR) nuclear power plant is the main reason for introducing ~(110m)Ag radionuclides into the primary loop coolant.By taking the ~(110m)Ag overstandard in primary loop system and radioactive waste liquid in a PWR nuclear power plant as the example

this paper investigates the speciation and removal methods of ~(110m)Ag.The results show that

the water chemistry environment of the core coolant has undergone a cyclic process from "alkaline-reduction" to "acidic-oxidation" and then to "alkaline-reduction".In this process

the ~(110m)Ag morphology has correspondingly undergone a process from atomic Ag~0 to ionic Ag~+

and then to Ag~0 nano-colloid.The conventional "filtration + ion exchange" process has relatively low decontamination factor for ~(110m)Ag colloidal radionuclides

while the "filtration + ion exchange + adsorption" process may be an effective process for ~(110m)Ag colloidal radionuclide removal.