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Preliminary Performance Assessment for Deep Borehole Disposal of High-Level Radioactive Waste

Published online by Cambridge University Press:  28 March 2012

Peter N. Swift ,
Bill W. Arnold ,
Patrick V. Brady ,
Geoff Freeze ,
Teklu Hadgu  and
Joon H. Lee
Peter N. Swift
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico, USA 87185
Bill W. Arnold
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico, USA 87185
Patrick V. Brady
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico, USA 87185
Geoff Freeze
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico, USA 87185
Teklu Hadgu
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico, USA 87185
Joon H. Lee
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico, USA 87185
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Abstract

Deep boreholes have been proposed for many decades as an option for permanent disposal of high-level radioactive waste and spent nuclear fuel. Disposal concepts are straightforward, and generally call for drilling boreholes to a depth of four to five kilometers (or more) into crystalline basement rocks. Waste is placed in the lower portion of the hole, and the upper several kilometers of the hole are sealed to provide effective isolation from the biosphere. The potential for excellent long-term performance has been recognized in many previous studies. This paper reports updated results of what is believed to be the first quantitative analysis of releases from a hypothetical disposal borehole repository using the same performance assessment methodology applied to mined geologic repositories for high-level radioactive waste. Analyses begin with a preliminary consideration of a comprehensive list of potentially relevant features, events, and processes (FEPs) and the identification of those FEPs that appear to be most likely to affect long-term performance in deep boreholes. The release pathway selected for preliminary performance assessment modeling is thermally-driven flow and radionuclide transport upwards from the emplacement zone through the borehole seals or the surrounding annulus of disturbed rock. Estimated radionuclide releases from deep borehole disposal of spent nuclear fuel, and the annual radiation doses to hypothetical future humans associated with those releases, are extremely small, indicating that deep boreholes may be a viable alternative to mined repositories for disposal of both high-level radioactive waste and spent nuclear fuel.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1475: Symposium NW – Scientific Basis for Nuclear Waste Management XXXV , 2012 , imrc11-1475-nw35-il08
Copyright
Copyright © Materials Research Society 2012

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