核电厂放射性液态流出物总γ放射性浓度控制值估算

核电厂放射性液态流出物排放监测包括源项监测、排放前取样监测和排放过程中的实时在线监测,其中源项监测和在线监测都是测量液态流出物的总γ放射性浓度,而不是活度浓度。本文针对新颁布实施的国家标准《核动力厂环境辐射防护规定》和《核电厂放射性液态流出物排放技术要求》所规定的滨海核电厂除氚和碳-14外其他放射性核素的活度浓度限值,通过理论分析和实验测量,建立了一种通过核电厂放射性液态流出物活度浓度估算总γ放射性浓度的方法,并结合秦山第二核电厂1号和2号机组放射性液态流出物中核素组成比例,确定了1号和2号机组放射性液态流出物排放的总γ放射性浓度控制值。

Estimating Control Target Value for Total Gamma Concentration in Radioactive Effluent from Nuclear Power Plant

Radioactive effluent Monitoring at nuclear power plants includes source term monitoring,prior-emission sampling monitoring and real-time monitoring by on-line radiation monitoring system during effluent emission.Both source term monitoring and on-line monitoring involve measurements of total gamma concentration instead of activity concentration.Considering the activity concentration limits of all the other nuclides included in radioactive effluent from nuclear power plants except 3H and 14C,this paper presents a method by which we could evaluate the total gamma concentration from activity concentration in radioactive effluent,and confirms the control target value for total gamma concentration in radioactive effluent from Qinshan second nuclear power plant Unit 1 and Unit 2,according to the proportion of different nuclides included in the radioactive effluent from Qinshan second nuclear power plant Unit 1 and Unit 2.