C-14 release and transport from a nuclear waste repository in an unsaturated medium [electronic resource].
- Washington, D.C. : United States. Dept. of Energy, 1990.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- 36 pages : digital, PDF file
- Additional Creators:
- Lawrence Berkeley National Laboratory
United States. Department of Energy
United States. Department of Energy. Office of Scientific and Technical Information
- The release of ¹⁴C as ¹⁴CO₂ from partly failed spent fuel containers has been analyzed by the flow of gases into and out of the containers. This flow of gases is driven by pressure differences, which are in turn caused by heating by the spent fuel. In this analysis, the timing and size of holes in the containers are assumed to be given. A better means of predicting the time distribution and sizes of penetrations in nuclear waste containers is needed. For the purposes of far-field transport calculations, we have adopted release rates that are shown to be bonding for the large range of hole sizes studied. The transport of released ¹⁴CO₂ has been analyzed by transport in equivalent porous medium. The peak ¹⁴CO₂ concentration in pore gas at 350 m above the repository does not depend on the time of hole occurrence, although the time of penetration obviously affects the arrival and duration of exposure to ¹⁴C. Nor does water saturation have much effect on peak concentration. In this analysis we have used a constant gas Darcy velocity. We performed limited sensitivity analysis on gas Darcy velocity by using values one order of magnitude above and below the published value. This probably gives us bounds on the likely gas Darcy velocity. Our calculations show that essentially all the released ¹⁴C will reach the ground surface in less than one half-life of ¹⁴C. However, the quantities of ¹⁴C reaching the ground surface are so small that even if all containers fail at emplacement and conservative dose factors are used, the resultant inhalation dose to the maximally exposed individual is about 0.1% of natural background radiation. 14 refs., 18 figs., 3 tabs.
- Published through SciTech Connect.
Lee, W.W.L.; Pigford, T.H.; Chambre, P.L.; Light, W.B.; Zwahlen, E.D.
- Funding Information:
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