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Transport of Radionuclides in Inhomogeneous Crystalline Rocks

Published online by Cambridge University Press:  28 February 2011

Joerg Hadermann ,
Fritz Roesel  and
Charles Mccombie
Joerg Hadermann
Affiliation:
Swiss Federal Institute for Reactor Research, CH-5303 Wuerenlingen
Fritz Roesel
Affiliation:
Swiss Federal Institute for Reactor Research, CH-5303 Wuerenlingen
Charles Mccombie
Affiliation:
Nagra, National Cooperative for the Storage of Radioactive Waste, CH-5401 Baden, Switzerland
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Abstract

In Switzerland high-level radioactive wastes are planned to be disposed of in deep-lying crystalline formations. The modelling approach for geospheric transport in the framework of a HLW safety assessment is described. The processes taken into account are advection and dispersion in water conducting veins or fractures. Out of these, nuclides may diffuse into a spatially limited zone of altered rock. Sorption of nuclides on the rock is taken into account. Diffusion out of fractures and sorption in the adjacent altered rock may often be represented by an effective surface sorption on the fracture walls. For transport of the 237-Np nuclide chain we present a sensitivity analysis. The performance of the geologic barrier depends most critically on the extent of the altered zones.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 50: Symposium STOCKHOLM – Scientific Basis for Nuclear Waste Management IX , 1985 , 655
Copyright
Copyright © Materials Research Society 1985

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