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Transport of Gaseous 14C in a Partially Saturated, Fractured, Porous Medium

Published online by Cambridge University Press:  21 February 2011

W. B. Light ,
P. L. Chambré ,
W. W.-L. Lee  and
T. H. Pigford
W. B. Light
Affiliation:
Department of Nuclear Engineering, University of California, and Lawrence Berkeley Laboratory, University of California, Berkeley, CA 94720
P. L. Chambré
Affiliation:
Department of Nuclear Engineering, University of California, and Lawrence Berkeley Laboratory, University of California, Berkeley, CA 94720
W. W.-L. Lee
Affiliation:
Department of Nuclear Engineering, University of California, and Lawrence Berkeley Laboratory, University of California, Berkeley, CA 94720
T. H. Pigford
Affiliation:
Department of Nuclear Engineering, University of California, and Lawrence Berkeley Laboratory, University of California, Berkeley, CA 94720
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Abstract

We predict the transport of 14C from the proposed nuclear waste repository at Yucca Mountain using a porous medium model. Use of this model is justified if the Peclet number, which indicates equilibrium between gas in fractures and liquid in rock pores, is much less than unity. For the assumed release rates, maximum predicted concentrations of 14CO2 in rock near the ground surface are comparable to the USNRC limit for unrestricted areas. Furthermore, dilution near the ground surface as the 14CO2 enters the atmosphere will lower the concentrations by several orders of magnitude. Travel times from the repository to the surface are predicted to be hundreds to thousands of years. For a wide range of the parameters, the release rate from the source has negligible effect on the maximum concentrations at the ground surface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 176: Symposium U – Scientific Basis for Nuclear Waste Management XIII , 1989 , 761
Copyright
Copyright © Materials Research Society 1990

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References

REFERENCES

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