Euradwaste '08 - EU Bookshop - Europa
Euradwaste '08 - EU Bookshop - Europa Euradwaste '08 - EU Bookshop - Europa
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Investigation of far-field processes in sedimentary formations at a natural analogue site - Ruprechtov Ulrich Noseck 1 , Vaclavá Havlová 2 , Radek Cervinka 2 , Juhani Suksi 3 , Melissa Denecke 4 , Wolfgang Hauser 4 Summary 1 GRS, Germany 2 NRI, Czech Republic 3 University of Helsinki, Finland 4 FZK-INE, Germany The analogue study at Rurpechtov site aimed at in-depth understanding of the behaviour of uranium and organic matter in a natural sedimentary system similar to overlying strata of salt domes but also other host rock formations for radwaste disposal. By application of a set of different microscopic and macroscopic analytical methods the complex immobilisation mechanism for uranium and the long-term stability of the immobile U(IV) phases were shown. Sedimentary organic carbon (SOC) is microbially degraded in the lignite rich layers, but DOC concentrations are relativley low, since only a very small fraction of SOC seems to be accessible. Beside increase of process understanding another important contribution of this study to the Safety Case consists in further development and testing of methods for colloid analysis, sample characterisation on μ-scale, and evaluation of environmental isotope signatures. 1. Introduction In component RTDC5 of the integrated EC project FUNMIG the far field of the host rock formation salt is subject of the investigations. In contrast to the two other host-rock components RTDC3 (clay) and RTDC4 (granite) RTDC5 is a natural analogue study. The study is performed at Ruprechtov site in Czech Republic and represents an analogue for potential migration processes in a similarly structured overburden of a salt dome but also in other geological formations, which are foreseen as potential host rocks for radioactive waste repositories. Results from site characterisation were already available before this study, e.g. [1]. Within the FUNMIG project specific questions have been addressed, to receive an in-depth understanding of the evolution of the natural system and the key processes involved in uranium immobilisation as well as the behaviour of organic matter. Emphasis was put into characterisation of the immobile uranium phases, their long-term stability and the processes controlling mobility of uranium in the system. The second major issue comprised the behaviour of colloids and organic matter in the system, i.e. to better understand the interrelation between sedimentary organic carbon (SOC) and dissolved organic carbon (DOC) and its impact on the mobility of uranium. 343
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