Radiolysis of hydrazine-containing solution for bubbling depressurization systems

Radiolysis was studied in an aqueous solution containing boric acid and hydrazine, as used in nuclear power plants for trapping volatile chemical forms of iodine during loss-of-coolant accidents. The parameters examined included changes in the hydrazine concentration and pH, and formation of radiolysis products in dependence on the initial hydrazine concentration, absorbed dose, dose rate and temperature. The loss of hydrazine and formation of products were compared for the static and through-flow irradiation modes. The results indicate that the radiation resistance of the solution decreases with its increasing oxygen content and with decreasing dose rate. (author). 4 figs., 17 refs