Modelling of tritium transport in the underground water from hypothetical reactor at the new NPP site in Lithuania

•The task is to predict tritium transport from hypothetical reactor.•The tritium activity concentration will not exceed the maximum allowed activity.•The results will allow predicting the radionuclides transport from NPP's reactor.

Groundwater flow and tritium transport model was performed for model domain of new NPP site in Lithuania using three-dimensional finite-element code FEFLOW 5.0 which allows modelling of groundwater flow and contaminant transport in a layered three-dimensional system. The goal of these estimations is to describe the tritium transport from hypothetical reactor of new NPP. The model was calibrated using monitoring data of water level. The results of this calculation will allow predicting the tritium transport from NPP's reactor.

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