Abstract
The inleakage of the radioactivity caused by ingress/egress could reduce the habitability of the main control room for the operators under the accident conditions. This study used the concentration-decay method to measure the air inleakage caused by ingress/egress, and based on this point, theoretical calculations of the radioactivity in the vestibule and the main control room were conducted to clarify the air cleaning effect. The results showed that: The measured air inleakage induced by each ingress/egress ranged from 0.273 m3 to 1.818 m3 at different opening speed and degree of the door. Compared with the present internal recycle air cleaning unit of main control room of AP1000, we recommended a design which can remove the radioactivity incurred from ingress/egress more effectively and rapidly. Therefore, to reduce the radiation risk of operators in main control room at designed basic accidents, the implementation of replacement is proposed as soon as possible.
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