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- W2182375412 abstract "Posiva carries out investigations and preparations for spent nuclear fuel disposal into Finnish bedrock at Olkiluoto. The salinity of groundwater in the bedrock, its distribution and quantity are important factors in planning the facilities for final disposal of the spent nuclear fuel, and in assessing the functionality and safety of the facilities. Belonging to site investigations, JP-Fintact carried out compilation of 3-D volume model of total dissolved salinity (TDS, g/l) distribution of Olkiluoto site. The model covers the central part of Olkiluoto island bedrock volume. The model update replaces the previous works. Current model is more simplified presentation of observations than previously, containing essentially enhanced amount and coverage of TDS data. The model is based on the hydrochemical TDS observations and the hydrology groundwater electrical conductivity data of flow logging converted to TDS. Observations confirm the concept of layered, diffuse behavior of increasing salinity according to depth. Model has been presented with four salinity classes ( 30 g/l), and two boundary surfaces have been shown between the volumes occupied by these classes. The boundaries are subhorizontal. The local distribution is heterogeneous, and its description will benefit of new data when available. The indirect geophysical electrical borehole logging and electromagnetic frequency sounding observation data offers dense data coverage, also outside of other borehole observations and the volume covered by boreholes. The usage was based on the ratio of groundwater electrical conductivity and TDS, and on the dependencies between bedrock electrical conductivity, porosity and groundwater electrical conductivity. The geophysical data values have variability compared to the model. The gathered TDS observations have been compiled into TDS boundaries and layers into Posiva’s ROCK-CAD system. Graphical presentations of the model have been compiled. The model has then been referred to the original geochemical and hydrological data, and to the site fracture zone model. Fracture zones seem to have some control of the local salinity distribution. The report describes the data and their use, and the compilation of model and the results. The model can now be used for later assessment, comparisons and visualization." @default.
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- W2182375412 date "2004-01-01" @default.
- W2182375412 modified "2023-09-24" @default.
- W2182375412 title "30 Model of Salinity of Bedrock Groundwater at Olkiluoto" @default.
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