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Kinetics of MgO Dissolution and Buffering of Fluids in the Waste Isolation Pilot Plant (Wipp) Repository

Published online by Cambridge University Press:  10 February 2011

Valerie Monastra  and
D. E. Grandstaff
Valerie Monastra
Affiliation:
now at: Department of Geological Sciences, Cornell University, Ithaca, NY 14853
D. E. Grandstaff
Affiliation:
Department of Geology, Temple University, Philadelphia, PA 19122 (grand @vm.temple.edu)
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Abstract

DOE has proposed to add MgO to backfill in the WIPP repository to stabilize pH and reduce gas pressures and spallation. Experiments show that MgO dissolution rates are proportional to surface area, nearly independent of pH, and decrease with increasing dissolved NaCl. The probable repository MgO dissolution rate will be ≤ 10 to 20 μmol m2 min−1. Simulations indicate that MgO dissolution will buffer pH and provide stabilizing cement; however, under highly reducing conditions MgO will not control total gas pressures. Adding oxidizing agents or materials containing oxidized species, for example anhydrite, to the backfill, might control gas pressures.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 556: Symposium QQ – Scientific Basis for Nuclear Waste Management XXII , 1999 , 625
Copyright
Copyright © Materials Research Society 1999

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References

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