LAUSR

Abstract We calculate the accumulation of ruthenium-106 with SCALE code and analyze the distribution of ruthenium-106 under different injection temperatures with ASTEC code. In deposited aerosol phase, the RuO and RuO 2 increase with temperature, however the RuO 3 increases rapidly and reaches equilibrium at a certain temperature of injection source. In suspended aerosol phase, the accumulation of RuO and RuO 2 decreases continuously with rising of temperature, while RuO 3 reaches the maximum at 750 °C. In gaseous phase, the masses of RuO and RuO 2 increase and reach equilibrium rapidly. Similar to gaseous aerosol phase, the accumulation of RuO 3 reaches to the maximum value at 750 °C. RuO 4 appears when the temperature above 750 °C and the RuO 4 mass at 900 °C are three times more than that of at 750 °C. Our results denote that a reasonable control of thermal-hydraulics parameters and redox conditions can effectively constrain the radionuclide ruthenium migration.