Investigations and evaluation of radionuclide migration at planned new nuclear power plant site

Vigilija Cidzikienė

Doctoral dissertation

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During research the migration of radionuclides in groundwater at planned nuclear power plant territory was analyzed. The groundwater flow direction and velocity, effective porosity and environmental dispersivity was estimated using tracer method in the target area of the planned NPP. The salt (NaBr) and fluorescent substance (uranine) were selected as tracers. The radionuclides (3H, 137Cs, 14C) migration in groundwater was modeled with FEFLOW simulation modeling program. The research work explores influence of building material (from previous NPP) and soil to groundwater.

In the the first chapter of the thesis defined the research object – the planned NPP territory. The task of review is to provide  the main radioactive sources, which radionuclides are formed in the NNP territory. The tracer method are described in detail. The method used to estimate the hydrogeological parameters (water flow direction and velocity, dispersion coefficient, and so on.). The chapter analyzes the environmental impact of the previous NPP.

In the the second chapter presented a tracer and water sampling methodologies,  instruments  used for tracer experiment and their principles of operation, kinetic fluorimetric measurements, the chemical analysis. The determination of tritium activity with beta liquid scintillation spectrometry was presented also. There was described the gamma-spectrometry method and computer programs (FEFLOW and CXTFIT) used for research work.

In the third chapter was submitted the situation of NPP territory, geophysical conditions, the hydrogeological parameters results were indentified  by tracer method. It was analyzed processes which could affect the tracer experiment results, the tracer experiment results was compared with the pumping test results. Presented tritium volumetric activity in groundwater and spectroscopy measurements results. There was analyzed the influence of building material for  groundwater. FEFLOW computer simulation program was applied to predict the migration of radionuclides (3H, 137Cs, 14C) in groundwater.

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145×205 mm
206 p.
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