A Comparison of In-Situ Radionuclide Migration Studies in the Studsvik Area and Laboratory Measurements
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Werner. Lutze, editor
A COMPARISON OF IN-SITU RADIONUCLIDE MIGRATION STUDIES IN THE STUDSVIK AREA AND LABORATORY MEASUREMENTS ..
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0. LANDSTROM ++ .E. KLOCKARS+ , 0. PERSSON ++ K. ANDERSSON+ ++ ý.TORSTENFELT , B.ALLARD+, S.A . LARSSON AND E.L. JVLLBORG Studsvik Energiteknik AB, S-611 82 NYK6PING, Sweden-++ Geological Survey of Sweden (SGU), Box 670, S-75 128 UPPSALA, Sweden; Department of Nuclear Chemistry, Chalmers University of Technology (CTH), S-412 96 GOTEBORG, Sweden ABSTRACT A series of in-situ radionuclide migration tests are in progress in the Studsvik area on the Swedish east coast. Three well defined flowpaths have been located and characterized using non-sorbing tracers (1-131 and H-3), and one of these pathways have been used for a study of the migration of sorbing elements (Sr-85). Laboratory sorption studies with Sr-85 have been performed on materials (rock-water) from the same location as the field tests and with variation of parameters not easily varied in-situ (e.g. pH and nuclide concentration). A fairly good correlation was obtained between retention in natural fractures (field experiment) and laboratory column studies, although the latter were performed on crushed samples of whole rock (retention factors 15 - 30). INTRODUCTION In-situ migration studies were suggested by 0. Brotzen in 1976 as part of the Pray and KBS program and a series of experiments were carried out in fractured crystalline rocks at the Studsvik site during 1977 and 1978 1 . In another part of the Studsvik site a new test area has recently been prepared and the first series of migration experiments have been carried out and are reported in this paper. This work was initiated and supported by Prav but is now carried out on commission from KBS. The main objectives with the present work are a comparison between migration parameters measured in field and laboratory experiments, and a critical examination of the methods and materials used. This is achieved by a coordination between different KBS-supported projects, such as sorption studies at CTH,
fracture mineral investigations at SGU and field migration experiments
at Studsvik. FIELD MEASUREMENTS Preparation of the test site The Studsvik test site is located about 90 km south of Stockholm (Cf Figure 1). The experimental area is situated approximately 400 metres from the
698 sea,
adjacent to an outcrop formation at about 30 metres above sea level.
Based
on the results of geological and tectonic mapping of the bedrock and geophysical studies from the ground surface eight hammer-drilled (0 115 mm) diamond-drilled (KIN,
and one
0 56 nun) holes were made.
Borehole measurements
(partly to obtain background values) were carried out
and fractures and their orientation were identified by TV-logging. In
order to determine hydraulic conductivities around and between the bore-
holes and to find suitable flow paths, water injection tests in single holes and interference tests,
tests were carried out.
the boreholes B6N (pumphole),
Based on the results of these hydra
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