Author(s): Yanchen Zhou; Tisong Hu; Nannan Zhang; Hongbin Fang
Linked Author(s):
Keywords: Radionuclide diffusion; Fluent; Two-dimensional model; Water resources security
Abstract: The current achievements about diffusion of radioactive liquid effluent has been introduced in this paper, and also the scope of application of three-dimensional, two-dimensional, one-dimensional and zero-dimensional numerical models. For an inland proposed nuclear power plant, two-dimensional model and FLUENT software were used to simulate the flow field of receiving water and radionuclide diffusion of radioactive liquid effluent in accident condition. k ε− model was chosen to simulate the flow field of receiving water and the result showed that it could reflect basically the original flow field. Component transport model was chosen to carry out the unsteady simulation of radionuclide 131I and 137Cs, result showed that short half-life nuclide 131I had faster speed of concentration decreasing than long half-life nuclide 137Cs, and they both have trend forward to diffuse upstream and the tributaries of the river downstream. The diffusion velocity is relatively fast where water flows quickly but in the places where water flows slowly or existing local eddy and backflow the diffusion velocity is much slower, and the nuclides will stay long term. The approach proposed in this paper is a quick and reliable way to predict radioactive nuclide movement after nuclear power plant accident.
Year: 2013