Post-Closure Performance Assessment for Deep Borehole Disposal of Cs/Sr Capsules

Post-closure performance assessment (PA) calculations suggest that deep borehole disposal of cesium (Cs)/strontium (Sr) capsules, a U.S. Department of Energy (DOE) waste form (WF), is safe, resulting in no releases to the biosphere over 10,000,000 years when the waste is placed in a 3–5 km deep wast...

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Veröffentlicht in:	Energies (Basel) 2019-05, Vol.12 (10), p.1980
Hauptverfasser:	Freeze, Geoff A, Stein, Emily, Brady, Patrick V
Format:	Artikel
Sprache:	eng
Schlagworte:	Aquifers Ballast Bentonite Biosphere Boreholes Bulk density Cement Cesium cesium (Cs) Climate change Crystalline rocks Design Diffusion coefficient Federal agencies Fractures Geology GEOSCIENCES Groundwater High level radioactive wastes Laboratories Nuclear energy Nuclear engineering Nuclear fuels Performance assessment Permeability Porosity Radioactive waste disposal Radioactive wastes Saline water Salinity Sediments Spent nuclear fuels Stratigraphy Strontium strontium (Sr) Tortuosity Waste disposal Waste management
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Beschreibung
Zusammenfassung:	Post-closure performance assessment (PA) calculations suggest that deep borehole disposal of cesium (Cs)/strontium (Sr) capsules, a U.S. Department of Energy (DOE) waste form (WF), is safe, resulting in no releases to the biosphere over 10,000,000 years when the waste is placed in a 3–5 km deep waste disposal zone. The same is true when a hypothetical breach of a stuck waste package (WP) is assumed to occur at much shallower depths penetrated by through-going fractures. Cs and Sr retardation in the host rock is a key control over movement. Calculated borehole performance would be even stronger if credit was taken for the presence of the WP.
ISSN:	1996-1073 1996-1073
DOI:	10.3390/en12101980