阳江核电站放射性气态流出物浓度计算

Calculation of the Radionuclides Concentration in Gaseous Effluents from Yangjiang Nuclear Power Plant

摘要: 针对阳江核电站的实际情形，基于阳江核电站区域的已知地面风场，通过高斯模型模拟计算了源于阳江核电站(东经112.27˚，北纬21.72˚)的放射性气态流出物点源瞬时释放后放射性核素云团的迁移和扩散过程，得到了放射性核素云团中心的运动轨迹、放射性核素云团中心地面相对浓度、放射性核素云团地面相对浓度分布及其等值线分布，同时给出了阳江市及邻近城市茂名市、云浮市、江门市放射性核素地面相对浓度随时间的变化。这些结果为源于阳江核电站的放射性气态流出物对整个阳江地区以及邻近城市的辐射环境影响提供参考信息，为可能发生的核电站事故下的监测提供参考数据。

Abstract: According to the practical situation of Yangjiang nuclear power plant and based on the specific ground wind field, the Gassion model is taken to simulate the transport and diffusion of the ra-dionuclide cloud in atmosphere, which come from an instantaneous point source from Yangjiang nuclear power plant (112.27˚ east longitude, 21.72˚ north latitude). The obtained calculated results are about the trajectory of the radionuclide cloud core, the relative concentration of the ra-dionuclide cloud center on the ground, the distribution of the relative concentration of the radio-nuclides and its isopleths. Further, the relative concentration of the radionuclides at Yangjiang nuclear power plant and the nearby cities, such as Yangjiang city, Maoming city, Yunfu city and Jiangmen city, have been evaluated. All these results not only can provide information for studying the radioactive effect on Yangjiang area and those nearby cities because of the radionuclides in gaseous effluents from Yangjiang nuclear power plant, but also can provide reference information for monitoring the possible nuclear incidents in nuclear power plant.