Hydrochemical characteristics are one of the most critical evaluation factors for the site selection and long-term performance safety evaluation of nuclear facilities.Mathematical statistics,ion proportion method,isotope analysis method,and hydrogeochemical simulation were used in this paper to investigate hydrochemical characteristics of an underground nuclear facility site along the coast.Its hydrochemical characteristics,possible controls,groundwater recharge source,and apparent age were analyzed.Furthermore,the conceptual model of groundwater flow and hydrochemical evolution in the area was preliminarily constructed.The results suggest that the total dissolved solids(TDS)of the groundwater is low,and the pH value in most samples is weakly acidic.The hydrochemical types of groundwater sampling from boreholes and tunnels are mainly HCO3-Na·Ca and HCO3-Ca·Na.The weathering of silicate rocks specifically controls hydrochemical components.Moreover,the weathering dissolution of albite and anorthite is the primary water-rock interaction of groundwater along unconfined aquifer main runoff paths.The groundwater source is the infiltration recharge of local atmospheric precipitation,and the 14C apparent age in the depth range of nuclear facilities is about 2.08-3.60 ka.It is concluded that the hydrochemistry and groundwater circulation conditions at the site are beneficial to ensure the safety of underground nuclear facilities.
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