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| Simulation of Radionuclide Migration in Underground Water of a Uranium Tailing Based on MODFLOW Software |
| LIU Zhong-ping1, SHU Hui2, LIU Qian-shun3, LI Ya-jun1 |
1. NO. 203 Research Institute of Nuclear Industry, Xianyang 712000, China;
2. 272 uranium industry co. Ltd of CNNC;
3. Liaoning Provincal Nuclear and Radiation Monitoring Center |
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Abstract Objective To study the time and space distribution of radionuclide of uranium tailing by means of numerical simulation in groundwater.Methods To select a uranium tailing in China as the research object and establish the radionuclide migration equation on the basis of the underground water dynamics model. When the uranium tailing retirs to 30 a,50 a,100 a,200 a,500 a,1000 a after, simulate the concentration distribution and largest migration distance of 238U and 226Ra in groundwater by using MODFLOW software and the calculation method of finite difference mesh.Results The activity concentration of 238U and 226Ra was 6.18 Bq/L, 0.76 Bq/L in the monitoring Well, when the uranium tailing retired after 1000 a.the maximum migration distance of 238U and 226Ra was 1.7 km, 0.7 km, respectively.Conclusion As the distance increased, the activity concentration of 238U and 226Ra decreased in groundwater. As time went on the activity concentration of 238U and 226Ra decreased rapidly at first, later tended to a stable value.
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Received: 08 August 2016
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