Abstract: The monitoring of atmospheric ¹⁴C around nuclear power plant is an important content of the supervisory monitoring of radiation environment. In this paper, the sampling and monitoring methods of ¹⁴C in the ambient air around Ningde NPP were presented. The variations and trends of the monitoring results from 2013 to 2021 were analyzed, and were comparatively studied with the baseline and other reported values around NPPs. Meanwhile, the correlation study with the gaseous effluent emission from Ningde NPP were analyzed. It was shown that the average specific activity of atmospheric ¹⁴C at each monitoring point of Ningde NPP ranges from 0.229 to 0.230 Bq/g(C), and the results of the Niulanggang monitoring point closest to the plant site may be affected by the discharge of the NPP. Furthermore, the seasonal variation of ¹⁴C specific activity was analyzed. It was shown that, except for the Niulanggang monitoring point, the specific activity of ¹⁴C was higher during July to September.

Key words: Ningde Nuclear Power Plant, environmental radiation monitoring, ¹⁴C, radioactivity in atmosphere