氚在某拟建核电厂长距离排放管线地下土壤-水中的扩散行为和迁移模拟研究  

Diffusion Behavior Characterization and Migration Simulation of Tritium in the Soil-Water System Below the Long-Distance Effluent Pipeline of a Proposed Nuclear Power Plant

作　　者：周嘉屿 孙乐文 高锦辉 文鸿宇 黄炳豪 陈堃杰 陈媛 杨杰 李传斌 吴涵玉 康明亮 ZHOU Jiayu;SUN Lewen;GAO Jinhui;WEN Hongyu;HUANG Binghao;CHEN Kunjie;CHEN Yuan;YANG Jie;LEE Chuanpin;WU Hanyu;KANG Mingliang(Sino-French Institute of Nuclear Engineering and Technology,Sun Yat-sen University,Zhuhai,Guangdong 519082,China;China Nuclear Power Engineering Co.,Ltd.,Shenzhen,Guangdong 518124,China;State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment,China Nuclear Power Engineering Co.,Ltd,Shenzhen,Guangdong 518172,China;Engineering Research Center of Ministry of Education for Nuclear Technology Application,East China University of Technology,Nanchang,Jiangxi 330013,China)

机构地区：[1]中山大学中法核工程与技术学院,广东珠海519082 [2]中广核工程有限公司,广东深圳518124 [3]中广核工程有限公司核电安全监控技术与装备国家重点实验室,广东深圳518172 [4]东华理工大学核技术应用教育部工程研究中心,江西南昌330013

出　　处：《世界核地质科学》2023年第S01期666-672,共7页World Nuclear Geoscience

基　　金：中国广核集团有限公司核电厂海水冷却塔关键技术研究尖峰课题,中国广核集团有限公司放射性液态流出物长距离排放的环境影响研究(编号:K-A2021.561);国家自然科学基金资助项目(编号:41773095,21906187)联合资助。

摘　　要：了解关键放射性核素3 H在某拟建核电厂长距离排放管线地下土壤-水中的迁移行为,可为3 H的监测方案和事故工况应急预案提供科学支持和数据支撑。采用贯穿扩散法研究了3 H在某拟建核电厂长距离排放管线地下土壤-水中的扩散行为,分析了不同压实密度对3 H有效扩散系数(De)的影响,并将获取的有效扩散系数作为溶质运移模型的输入参数,通过Visual MODFLOW软件对模拟区域进行水文建模和溶质运移预测,模拟30 d到10 a期间3 H在区域内地下水中的迁移。结果表明:在土壤压实密度介于2000~2400 kg·m^(-3)之间时,3 H的有效扩散系数介于1.48×10^(-11)~2.83×10^(-11 )m^(2)·s^(-1)之间,在地下水中迁移扩散范围不超过200 m^(2),且3 H污染物中心β活度浓度始终低于1 Bq·L^(-1),符合我国各类规章和标准限值。To gain insights into the migration behavior of the radionuclide 3 H in the soil-water system below a long-distance effluent pipeline of a proposed nuclear power plant,this study provides scientific support and the reference for monitoring schemes and emergency plans under accident conditions.The penetration diffusion method was employed to investigate the diffusion behavior of 3 H and the effective diffusion coefficient(De)of 3 H was tested with different compaction densities.The obtained De was taken as the input parameter for the transport model,with which 3 H migration from 30 days to 10 years was simulated by using Visual MODFLOW software.The results indicate that for dry soil with density between 2000-2400 kg·m^(-3),De ranges from 1.48×10^(-11) to 2.83×10^(-11 )m^(2)·s^(-1),and the maximum area of migration in groundwater is below 200 m^(2).Moreover,at the 3 H polluted center,βactivity concentration is consistently below 1 Bq·L^(-1),which complies with various regulatory standards in China.

关 键 词：放射性液态流出物 氚 扩散 核素迁移 

分 类 号：TL942[核科学技术—辐射防护及环境保护]