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- W1531477560 abstract "BASTE DISPOSAL IN SRAKtTE: MCLIMlWWr RESULTS nm snuNi. SHEDEN Neville G. W. Cook*. John E.-fial*^' and Paul k. Uitherspoon* Department of Materials Science anfi^Hineral Engineering University of California* Berk*ley,94720 **Oepartreent of Eirth Sciences, University of Waterloo Waterloo, Ontario. Canada •Department of Earth Sciences* Lftwrence Berkeley Laboratory and Department of Materials Science and Mineral Engineering University of California, Berkeley 94720 IHTaPDUCTION Significant quantities of nuclear wastes exist already and continue to bs pro duced (U.S. 00E. 1978). To provide better protection for man and the environment fron the potential hazard posed by these wastes than does the present practice of near surface storage, disposal by deep burial in suitable geologic sites is favored (NRC, 1957; 1RG. 1578). The principal attraction of deep geologic disposal is that it provides a prac ticable method for isolating these wastes physically from the biosphere for long periods of tine. The principal uncertainty about deep geologic disposal concerns the rate at w M c h toxic components of the wastes may leak back Into the biopshere. There are two major aspects to the design of a suitable underground repository for nuclear wastes, namely, the intrinsic properties of the geologic media, and the effects which the excavation of a repository, emplacing radioactive waste in it and, finally, sealing the excavations will have on the isolation of these wastes. The evaluation of these aspects Involves concepts familiar to most mechanical engineers. The extent to which this Is not true arises from geologic terminology and the inher ent variability and uncertainty of the properties of sub-surface media. Although there are some places where an underground repository could be sited above the present water table, it cannot be assumed that climatic or other changes will not alter this condition during the period over which isolation of wastes is required. Accordingly, it must be assumed tnat the repository and rock mass will become saturated after the excavations have been sealed. The porosity and oermeability of intact specimens cf granite are of the order of one percent and 1 0 meters' (lO'^m/sec), respectively. It may seem that these and the ratio of permeability to porosity are such that the time taken for ground-" @default.
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- W1531477560 date "2010-06-16" @default.
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- W1531477560 title "Waste disposal in granite: preliminary results from Stripa, Sweden" @default.
- W1531477560 hasPublicationYear "2010" @default.
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