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Report No.

The GTS-LTD MONOPOLE-2 experiment at grimsel; Predictive modeling and comparison with monitoring data

Soler, J. M.*; Martin, A. J.*; Lanyon, G. W.*; Havlov$'a$, V.*; Siitari-Kauppi, M.*; Tachi, Yukio  

An in-situ long-term diffusion (LTD) project has been performed at the Grimsel Test Site, Switzerland, to realistically evaluate matrix diffusion of radionuclides in crystalline rock with minimal disturbance to in-situ conditions. A second in situ diffusion experiment (monopole 2) has been performed. Predictive calculations for the monopole-2 experiment, based on results from monopole 1 or from through-diffusion experiments have been compared to monitoring data from the injection and observation boreholes. For the non-sorbing tracers (HTO, $$^{36}$$Cl$$^{-}$$), the diffusion parameters from the through-diffusion experiments provide a better match for the measurements, especially in the injection borehole. The initial drop in activities for $$^{134}$$Cs$$^{+}$$ and $$^{133}$$Ba$$^{2+}$$ shows clearly the effect of sorption. Bulk rock parameters for $$^{134}$$Cs$$^{+}$$ from monopole 1 seem to be applicable to monopole 2. However, $$^{133}$$Ba$$^{2+}$$ seems to sorb more strongly than expected.



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