Geochemical evaluation of different groundwater-host rock systems for radioactive waste disposal

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doi: 10.1016/S0169-7722(02)00130-4
Authors:Metz, V.; Kienzler, B.; Schüssler, W.
Author Affiliations:Primary:
Forschungszentrum Karlsruhe, Institut für Nukleare Entsorgung, Karlsruhe, Federal Republic of Germany
Volume Title:8th international conference on Chemistry and migration behaviour of actinides and fission products in the geosphere; Migration '01
Volume Authors:Kim, Jae-Il, editor; Geckeis, Horst
Source:Journal of Contaminant Hydrology, 61(1-4), p.265-279; 8th international conference on Chemistry and migration behaviour of actinides and fission products in the geosphere; Migration '01, Bregenz, Austria, Sept. 16-21, 2001, edited by Jae-Il Kim and Horst Geckeis. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0169-7722
Publication Date:2003
Note:In English. 33 refs.; illus., incl. 2 tables
Summary:The geochemical suitability of a deep bedrock repository for radioactive waste disposal is determined by the composition of geomatrix and groundwater. Both influence radionuclide solubility, chemical buffer capacity and radionuclide retention. They also determine the chemical compatibility of waste forms, containers and backfill materials. Evaluation of different groundwater-host rock systems is performed by modeling the geochemical environments and the resulting radionuclide concentrations. In order to demonstrate the evaluation method, model calculations are applied to data sets available for various geological formations such as granite, clay and rocksalt. The saturation state of the groundwater-geomatrix system is found to be fundamental for the evaluation process. Hence, calculations are performed to determine if groundwater is in equilibrium with mineral phases of the geological formation. In addition, corrosion of waste forms in different groundwater is examined by means of reaction path modeling. The corrosion reactions change the solution compositions and pH, resulting in significant changes of radionuclide solubilities. The results demonstrate that geochemical modeling of saturation state and compatibility of the host formation environment with the radioactive waste proves to be a feasible tool for evaluation of various sites considered as deep underground repositories. Abstract Copyright (2003) Elsevier, B.V.
Subjects:Actinides; Buffers; Chemical composition; Controls; Geochemistry; Granites; Ground water; Igneous rocks; Ions; Isotopes; Matrix; Metals; Migration of elements; Models; Plutonic rocks; Pollution; Pore water; Radioactive isotopes; Radioactive waste; Saturation; Solubility; Underground disposal; Uranium; Waste disposal; Water-rock interaction
Record ID:2003043709
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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