Waste Package Component Interactions with Savannah River Defense Waste Glass in a Low-Magnesium Salt Brine

McGrail, B.P.

doi:10.13182/nt86-a33859

Cited by 26 publications

(31 citation statements)

References 18 publications

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“…Other studies [2,3] had shown that reducing conditions significantly decreased the amount of Tc-99 in solution. In those studies, only solution concentrations were presented; thus, it was difficult to determine if the lower Tc-99 concentrations were due to the glass leaching less or to the reduction of Tc-99 to the 4+ state which formed Tc02 that precipitated.…”

Section: Introductionmentioning

confidence: 90%

“…The same dependence was seen with the glass prepared under oxidizing conditions. McGrail at PNL has leached a Tc-99 doped simulated DWPF glass in a low Mg brine (Permian Basin Brine 1) at 90°C [3] but did not directly calculate a normalized mass loss for the release ~ased on Tc-99. From his data at 100 days, we calculated a normalized mass loss of 1.9 gjm .…”

Section: Leachini Jn Simulated Salt Groundwatermentioning

confidence: 99%

“…Other studies [13,14] have shown that reducing conditions such as those that will be present in a granite or basalt repository decrease leach rates of the glass matrix elements and the alkali elements less than a factor of 2 based on B, Si, or Li. The significant decreases, greater than a factors of 10, observed for the redox active elements [1][2][3] such as Tc-99 must be due to solubility effects rather then an increase in the durability of the glass.…”

Section: Effect Of Reducjnlj Condjtjons On Leachjnlj Tc-99mentioning

confidence: 99%

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Leaching Tc-99 from SRP Glass in Simulated Tuff and Salt Groundwaters

Bibler

Jurgensen

1987

MRS Proc.

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Results of leach tests with Tc-99 doped SRP borosilicate waste glass are presented. The glass was prepared by melting a mixture of SRP 165 powdered frit doped with a carrier free solution of Tc-99 at 1150°C. Dissolution of portions of the resulting glass indicated that the Tc-99 was distributed homogeneously throughout the glass. Static leach tests up to 90 da1s were performed at 90°C in J-13 tuff groundwater or WIPP brine A at a SAN of lOOm-.Normalized mass losses were calculated for Tc-99 as well as all the major elements in the glass. Results indicated that under ambient oxidizing conditions Tc-99 leached no faster than the glass-forming elements of the glass. In J-13 water, Tc-99leached congruently with B. In WIPP brine A, it leached congruently with Si. Leach rates for Li were higher in both groundwaters, probably due to a contribution from an ion exchange mechanism. Leach tests were performed under reducing conditions in J-13 water by adding Zn/Hg amalgam to the leachate. In these tests the pH increased significantly, probably because of the reaction of the amalgam with the water. In a 21-day test, the pH increased to 13 and leach rates for the glass were very high. Even though there was si!2nificant dissolution of the glass, the normalized mass loss based on Tc-99 was only 0.02g/m . This result and the fact that reducing conditions at normal pH values do not significantly affect the dissolution of the glass, indicate that the low concentrations for Tc-99 obtained under reducing conditions are due to its solubility and not due to an increased durability of the glass.

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Section: Introductionmentioning

confidence: 90%

Section: Leachini Jn Simulated Salt Groundwatermentioning

confidence: 99%

Section: Effect Of Reducjnlj Condjtjons On Leachjnlj Tc-99mentioning

confidence: 99%

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Leaching Tc-99 from SRP Glass in Simulated Tuff and Salt Groundwaters

Bibler

Jurgensen

1987

MRS Proc.

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“…In the FBSR final waste form the radionuclide release (Cs and Re) is retarded preferentially to the matrix element, Na, release (Table V) or conversely, Na is released from one of the phases preferentially compared to the nosean phase which retains the Re. This finding is noteworthy because the Hanford specification for Na release for vitrified waste forms is an indicator for the congruent release of Tc 99 since Na and B and Tc 99 are all released at similar stoichiometric rates (congruently) from vitrified waste forms [10,11,15,16,17,18,19,20,21,22,23,24].…”

Section: Durability Testing Of the Fbsr Mineral Productmentioning

confidence: 86%

Characterization and Performance of Fluidized Bed Steam Reforming (FBSR) Product as a Final Waste form

Jantzen

2006

Ceramic Transactions Series

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“…Corrosion of the metal containers will generate iron oxyhydroxides that are known to adsorb or coprecipitate with Si (Harder 1978). This can act as an additional sink for Si, resulting in enhanced rates of glass corrosion (McVay and Buckwalter 1983;McGrail 1986). However, iron hydroxide precipitates may also have a beneficial effect in that they are well 4.12 known adsorbents for a wide variety of metals, and so could lower release rates for some radionuclides.…”

Section: Materials Interaction Testsmentioning

confidence: 99%