Actinide migration experiment in the HRL AeSPOe, Sweden: results of laboratory and in situ experiments (Pt. 1)

This report covers investigations on actinide migration in single fractured granite samples performed in laboratory and in situ in the AeSPOeHRL. Design of experimental setup, breakthrough of inert tracer and of actinides Am, Np and Pu are presented. Breakthrough curves are analyzed to determine hydraulic properties of the fractured samples. Destructive and non-destructive analyses of the samples are performed. The different analytical techniques for characterization of the flow path and the sorbed actinides are presented. One-dimensional transport model calculations are performed and the results are compared to the experimental findings. The rather simple model is not well suited for the complex flow paths and the complex sorption process. Matrix diffusion processes are not relevant vor the cores investigated