摘要
本文以江西彭泽内陆核电厂拟选厂址为研究区,基于CAP88-PC(清洁空气法案评价工具包)计算模型预测11种排放高度情景,下气载放射性核素131I和137Cs的大气扩散过程。研究结果表明:放射性核素131I大气弥散因子、空气浓度、干沉降速率和地面沉积速率随距离增加呈先增加后减少趋势;在同一风向下随不同排放高度增加呈下降趋势,其最高值均出现在NNW方位。放射性核素137Cs大气弥散因子、空气浓度、干沉降速率和地面沉积速率随距离增加呈增加趋势;在同一风向下随不同排放高度增加呈下降趋势,其最高值均出现在NNW方位。对比2种核素发现:放射性核素137Cs大气弥散因子平均为131I的1.1倍;放射性核素131I空气浓度、干沉降速率和地面沉积速率分别平均为137Cs的29.7倍、577.0倍和184.4倍。本研究可为核电厂放射性核素环境影响评价提供参考。
An inland nuclear power plant site may to be selected in future was the research region in this paper.Atmosphere dispersion processes of131 I and137Cs radionuclides were predicted by CAP88-PC model（ Clean Air Act Assessment Package） under 11 different release height scenarios. Results showed that atmosphere dispersion factor、air concentration、dry deposit rate and ground deposit rate of131 I presented first increased and then decreased trend with distance; and that displayed decreased trend with increased release height in the same wind direction and the max value appeared in NNW. Atmosphere dispersion factor、air concentration、dry deposit rate and ground deposit rate of137 Cs presented increased trend with distance; and that displayed decreased trend with increased release height in the same wind direction and the max value appeared in NNW. Comparison of results of two kinds of radionuclides showed that atmosphere dispersion factor of137 Cs was 1. 1 times that of131 I and air concentration、dry deposit rate and ground deposit rate of131 I were 29. 7,577. 0 and 184. 4 times that of137 Cs,respectively. This study can provide reference for environmental impact assessment of redionuclide from nuclear powder plant.
出处
《核农学报》
CAS
CSCD
北大核心
2015年第1期128-138,共11页
Journal of Nuclear Agricultural Sciences
基金
重大专项CAP1400安全审评关键技术研究(2013ZX06002001)
关键词
放射性核素
CAP88
内陆核电厂
大气扩散
环境影响
radionuclide
CAP88
inland nuclear power plant
atmosphere dispersion
environmental impact
