Abstract: With respect to current waste treatment technology for NPPs at home and abroad, liquid effluents can be managed by certain processes to reach the state of Near-Zero Emission for nuclides, excludingTritium and ¹⁴C, in them. As the processes do not treat Tritium effectively, its concentration is a decisive factor to determine whether or not to reuse liquid effluents. With practical experiences learned from running NPPs in China, the principle of liquid effluent's reuse and release for AP1000 nuclear power units is studied. That is, after treatment, release of liquid effluent with high Tritium content, reuse of liquid effluent with low Tritium content as much as possible, and discharge of the unbalanced parts. Calculations with realistic source terms show that, with a low concentration of Tritium in liquid effluent, the demand for discharge or reuse can be met while the activity of it after treatment does not exceed 50 Bq/L, with exception of Tritium and ¹⁴C.

Key words: Nuclear Power Plant, Liquid effluents, Reuse, Release