title: Swedish-German actinide migration experiment at ASPO hard rock laboratory.
abstract: Within the scope of a bilateral cooperation between Svensk Kärnbränslehantering (SKB) and Forschungszentrum Karlsruhe, Institut für Nukleare Entsorgung (FZK-INE), an actinide migration experiment is currently being performed at the Aspö Hard Rock Laboratory (HRL) in Sweden. This paper covers laboratory and in situ investigations on actinide migration in single-fractured granite core samples. For the in situ experiment, the CHEMLAB 2 probe developed by SKB was used. The experimental setup as well as the breakthrough of inert tracers and of the actinides Am, Np and Pu are presented. The breakthrough curves of inert tracers were analyzed to determine hydraulic properties of the fractured samples. Postmortem analyses of the solid samples were performed to characterize the flow path and the sorbed actinides. After cutting the cores, the abraded material was analyzed with respect to sorbed actinides. The slices were scanned optically to visualize the flow path. Effective volumes and inner surface areas were measured. In the experiments, only breakthrough of Np(V) was observed. In each experiment, the recovery of Np(V) was < or = 40%. Breakthrough of Am(III) and Pu(IV) as well as of Np(IV) was not observed.
authors.affiliation: Institut für Nukleare Entsorgung, Forschungszentrum Karlsruhe, PO Box 3640, D-76021 Karlsruhe, Germany. kienzler@ine.fzk.de
authors.forename: B
authors.initials: B
authors.lastname: Kienzler
authors.forename: P
authors.initials: P
authors.lastname: Vejmelka
authors.forename: J
authors.initials: J
authors.lastname: Römer
authors.forename: E
authors.initials: E
authors.lastname: Fanghänel
authors.forename: M
authors.initials: M
authors.lastname: Jansson
authors.forename: T E
authors.initials: TE
authors.lastname: Eriksen
authors.forename: P
authors.initials: P
authors.lastname: Wikberg
mesh_terms: D008671:Actinoid Series Elements / Q000032:analysis*; D055593:Geological Phenomena; D005844:Geology; D005858:Germany; D007391:International Cooperation; D011850:Radioactive Waste; D012822:Silicon Dioxide / Q000737:chemistry*; D013548:Sweden
chemical_list: D008671:Actinoid Series Elements; D011850:Radioactive Waste; C007886:granite; D012822:Silicon Dioxide