In order to control the Argon-41(41Ar)radiation source term in European Pressurized Reactor(EPR)coolant,this research pioneers the development of a transport model for 41Ar in EPR coolant and elucidates the pattern of 41Ar specific activity variation under different conditions.Through the model analysis,it is found that the specific activity of 41Ar in the coolant of a unit is abnormal,and it is the first time to detect the formation of a stable gaseous radiation hotspot within the gas-liquid separator of the EPR's hydrogen refueling station.The model is used to trace the specific path that the environmental air carries 40Ar into the coolant,and measures are taken to effectively control the radiation source term of 41Ar and reduce the radiation risk of the unit.
European Pressurized Water Reactor(EPR)Reactor activationSource item controlRadiation protection41Ar
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