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Transport of radionuclides in inhomogeneous crystalline rocks

Conference · · Mater. Res. Soc. Symp. Proc.; (United States)
OSTI ID:5366785
; ;
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 the authors present a sensitivity analysis. The performance of the geologic barrier depends most critically on the extent of the altered zones.
Research Organization:
Swiss Federal Institute for Reactor Research, Wuerenlingen
OSTI ID:
5366785
Report Number(s):
CONF-850995-
Conference Information:
Journal Name: Mater. Res. Soc. Symp. Proc.; (United States) Journal Volume: 50
Country of Publication:
United States
Language:
English

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