Abstract: Based on the monitoring data of tritium in the air and water around the nuclear base of nuclear power institute from 2014 to 2017, the effective doses to be accumulated in various pathways of key residential groups were roughly estimated. The results show that there is no significant difference in tritium activity concentration between the upstream, downstream and drinking water, indicating that the sampling time of surface water may be misplaced with the discharge time of liquid effluent, or the tritium of liquid effluent at 1km downstream of the discharge outlet has been diluted to the background level; the tritium activity concentration in air and rain water decreases with the increase of distance from the nuclear base. The average annual tritium intake of adults, teenagers, children, young children and infants in the residential groups near the complex building was 1.52, 1.44, 1.05, 0.681 and 0.562 kBq/a, respectively. And the annual effective doses to be accumulated were 0.027 4, 0.026 1, 0.024 2, 0.021 1 and 0.026 9 μSv/a respectively. The maximum effective dose of tritium in adult group was 0.027 4 μSv/a, but it only accounted for less than 1 ‰ of the target dose (0.25 mSv/a). It can be concluded that tritium has little effect on the surrounding environment of nuclear base under normal operation conditions.

Key words: nuclear power institute, nuclear base, tritium, dose evaluation