Reaction of Topopah Spring tuff with J-13 water: a geochemical modeling approach using the EQ3/6 reaction path code

Delany, J.M.

doi:10.2172/59915

Cited by 28 publications

(49 citation statements)

References 17 publications

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“…The Tsw2 has several desirable features: relatively simple, well-characterized mineralogy which includes only trace phases that contain redox elements (Delany, 1985;Wolery, 1986, Knauss et al, 1985); thermodynamic data at elevated temperature are available for all of the relevant minerals and aqueous solutes; and specific-surface areas and kinetic data at elevated temperatures exist for all the major primary and many potential secondary minerals.…”

Section: Sample Characterization Andpreparationmentioning

confidence: 99%

Results of plug-flow reactor experiments with crushed tuff at 280C and 300C

Dibley¹,

Knauss²,

Rosenberg³

1999

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We report on the results to date for two plug-flow reactor experiments, PFR-11 and PFR-13, designed to simulate reactive transport chemical and physical processes. These experiments provide a physical model of idealized onedimensional plug flow and chemical reaction using deionized water and crushed Topopah Springs Tuff (Tsw2). Data consist of effluent ion concentrations and pH measurements taken at several times during both experiments and limited mineralogical analysis of post-test solid phases for PFR-11.

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Section: Sample Characterization Andpreparationmentioning

confidence: 99%

Results of plug-flow reactor experiments with crushed tuff at 280C and 300C

Dibley¹,

Knauss²,

Rosenberg³

1999

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“…The "Carbon Deficient" and "Phosphate Deficient" media contained no organic carbon or phosphate, respectively, approximating the levels of these species found in J13 pore water. 3 The concentrations of the other macronutrients, sulfate and nitrogen, were likewise adjusted in "J13-SO," and "313-NO,", respectively, by decreasing them to match those found in 1X J13 (Table 1). Finally, all experimental media are predicted to have a pH of 7.2.…”

Section: A Mediamentioning

confidence: 99%

Sustaining Native Microbial Growth With Endogenous Nutrients at Yucca Mountain

Davis¹,

Martin²,

Miranda³

et al. 1998

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“…In these simulations, we used the thermodynamic model EQ3/6 (unqualified) Version 8.0 (Wolery, 1992a(Wolery, , 1992bWolery and Daveler, 1992) Delany, 1985;Knauss and Peifer, 1986;Knauss et al, 1987).…”

Section: Mineralogical and Geochemical Parametersmentioning

confidence: 99%

Predicting mineral alteration at the potential nuclear waste repository at Yucca Mountain, NV with reactive transport modeling

Glassley¹

1998

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April 1998This is an informal report intended primarily for internal or limited external distribution. The opinions and conclusions stated are those of the author and may or may not be those of the Laboratory. Work performed under the auspices of the U.S. Department of Energy by the Lawrence Livermore National Laboratory under Contract W-7405-ENG-48. DISCLAIMERThis document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or the University of California, and shall not be used for advertising or product endorsement purposes.This report has been reproduced directly from the best available copy. ABSTRACTWe present the results of a reactive transport modeling study that examines the sensitivity of mineral evolution to temperature, condensate properties and water flow conditions anticipated to occur in the potential Yucca Mountain nuclear waste repository site. We have investigated a key aspect of the thermal-hydrological repository system, the interaction of condensate water flowing through fractures at the site. Future simulations will include mineral changes at the boiling front, a process not considered in this study.Our simulations show that the principal mineral changes that occur are dissolution of the initial phases (mainly calcite, but also feldspars and clay) and formation of zeolites and hydrated aluminous phases. Major differences in mineral alteration occur over very short distances. Fracture mineral alteration is clearly coupled with the thermal hydrological environment. Fracture porosity is enhanced in those areas where condensate forms, an upper, lower temperature condensate zone and a lower, high temperature condensate zone. The locations where mineral precipitation occur and porosity decreases depend on the integrated residence time of the solution on the fracture surface. In general, mineral precipitation is expected to occur in the region ~150 m above the water table. Whether the changes in porosity are significant enough to modify thermohydrological behavior remains to be evaluated.

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Reaction of Topopah Spring tuff with J-13 water: a geochemical modeling approach using the EQ3/6 reaction path code

Cited by 28 publications

References 17 publications

Results of plug-flow reactor experiments with crushed tuff at 280C and 300C

Results of plug-flow reactor experiments with crushed tuff at 280C and 300C

Sustaining Native Microbial Growth With Endogenous Nutrients at Yucca Mountain

Predicting mineral alteration at the potential nuclear waste repository at Yucca Mountain, NV with reactive transport modeling

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