Abstract: The statistics of radioactive effluent emissions from operating nuclear power plants is an important work. However, it is found in practice that the activity concentrations of many radionuclides in the effluents from nuclear power plants are not high, and the analysis results are often lower than the detection limit in the effluent emissions statistics. In this context, it is a challenge to make deep research on how the monitoring data can be processed to bring emissions statistics closer to actual emissions. In this paper, the monitoring data of effluents from Qinshan nuclear power base in recent years are collected; their numerical distribution characteristics are analyzed and studied; the statistical method and strategy of effluent emissions based on radionuclide detection rate are put forward; and the recommended value of the value coefficient of the detection limit of effluent is given. By comparing with the statistical results of traditional methods and by analyzing the differences, it is considered that the statistical method and strategy based on radionuclide detection rate is realistic and feasible, and the statistical results are closer to the actual emission situation, which is worthy of further research.

Key words: nuclear power plant, detection limit, emission activity concentration, emissions