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The Compilation of Geochemical Data Bases for Performance Assessment of a Planned Repository in the Opalinus Clay in Northern Switzerland

Published online by Cambridge University Press:  01 February 2011

Bernhard Schwyn  and
Paul Wersin
Bernhard Schwyn
Affiliation:
National Cooperative for the Disposal of Radioactive Waste (Nagra), 5430 Wettingen, Switzerland
Paul Wersin
Affiliation:
National Cooperative for the Disposal of Radioactive Waste (Nagra), 5430 Wettingen, Switzerland
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Abstract

Chemical retention of radionuclides in the near field and in the host rock is an important safety pillar within the Swiss concept for a radioactive waste repository. Geochemical databases for solubility limits in cement and bentonite porewater and sorption / diffusion in cement, compacted bentonite and Opalinus Clay were compiled for use in safety assessment calculations. The databases are presented for selected safety-relevant radioelements. In contrast to earlier safety assessment studies Kd values were not truncated at 5 m3 kg−1 and values well above 10 m3 kg−1 (e.g. for actinides) are reported.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 807: Symposium Scientific Basis for Nuclear Waste Management XXVII , 2003 , 761
Copyright
Copyright © Materials Research Society 2004

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