海域自动连续监测辐射剂量率影响机制初步研究

Preliminary Study on Influence Mechanism of Automatic and Continuous Monitoring of Marine Radiation Dose Rate

海域辐射自动连续监测是完善核电厂辐射环境监督性监测的有力手段,需要对监测到的辐射剂量率的变化规律及影响机制进行研究,为建立核电厂异常排放和事故排放预警水平提供技术依据。本文主要介绍防城港核电厂海域辐射自动连续监测系统的相关设计,对近一年的监测结果进行初步研究。结果表明,系统监测到的辐射剂量率主要来源于宇宙射线的贡献,同时受降雨的影响明显。本文还将连续监测数据与陆上辐射剂量率连续监测数据进行了对比,探讨了辐射剂量率的周期性变化规律,分析了核电厂液态流出物排放的影响。

Automatic and continuous monitoring of marine radiation dose rate is one of effective tools to improve the environmental supervision of coastal nuclear power plant(NPP). It is necessary to study the change law and influence mechanism of the radiation dose rate to provide technical basis for establishing the early warning level of abnormal discharge and accident discharge of nuclear power plants. This paper mainly introduces the design of automatic continuous monitoring system for radiation in the sea area of Fangchenggang NPP. The results show that the radiation dose rate measured by the system mainly comes from the contribution of cosmic rays, and it is obviously affected by rainfall. This paper also compares the continuous monitoring data with the continuous monitoring data of radiation dose rate on land, discusses the periodic variation rule of radiation dose rate, and analyzes the influence of liquid effluent emission from NPP.