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Hydrothermal Interaction of Topopah Spring Tuff With J-13 Water as a Function of Temperature

Published online by Cambridge University Press:  26 February 2011

Kevin G. Knauss ,
J. M. Delany ,
W. J. Beiriger  and
D. W. Peifer
Kevin G. Knauss
Affiliation:
Earth Sciences Department, Lawrence Livermore National Laboratory, Livermore, CA 94550
J. M. Delany
Affiliation:
Earth Sciences Department, Lawrence Livermore National Laboratory, Livermore, CA 94550
W. J. Beiriger
Affiliation:
Earth Sciences Department, Lawrence Livermore National Laboratory, Livermore, CA 94550
D. W. Peifer
Affiliation:
Earth Sciences Department, Lawrence Livermore National Laboratory, Livermore, CA 94550
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Abstract

In support of the Nevada Nuclear Waste Storage Investigations Project experiments were conducted to study the hydrothermal interaction of rock and water representative of a potential repository in tuff. These experiments provided data relevant to near-field repository conditions that can be used to: assess the ability to use “accelerated” tests based on the SA/V (surface area/volume) parameter and temperature; allow the measurement of chemical changes in phases present in the tuff before reaction as well as the identification and chemical analysis of secondary phases resulting from hydrothermal reactions; and demonstrate the usefulness of geochemical modeling in a repository environment using the EQ3/6 thermodynamic/kinetic geochemical modeling code. Crushed tuff and polished wafers of tuff were reacted with a natural ground water in Dickson-type gold-cell rocking autoclaves which were periodically sampled under insitu conditions. Results were compared with predictions based on the EQ3/6 geochemical modeling code. Eight short-term experiments (2 to 3 months) at 150°C and 250°C have been completed using tuff from both drillcore and outcrop. Long-term experiments at 90°C and 150°C using drillcore polished wafers are in progress. This paper will focus on the results of the 150°C and 250°C experiments using drillcore polished wafers.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 44: Symposium N – Scientific Basis for Nuclear Waste Management VIII , 1984 , 539
Copyright
Copyright © Materials Research Society 1985

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