The Impact of Higher Waste Loading on Glass Properties: The Effects of Uranium and Thorium Page: 40 of 180
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Immobilization Technology Section
Savannah River Technology Center
Westinghouse Savannah River CompanyWSRC-TR-2003-00386
Rev. 0blocks. Averaging the ppm's for each set of triplicates helps to minimize the impact of the ICP
effects.
Table 5-1 summarizes the average measurements and the reference values for the 4 primary
elements of interest. The results indicate consistent and accurate measurements from the SRTC-
ML processes used to conduct these analyses.
Table 5-1. Results from Samples of the Multi-Element Solution StandardAnalytical Av Av Av Av
Block B Li Na Si
( m) (pm) ( m) ( m)
1 19.87 9.73 83.93 49.90
2 19.93 9.73 85.47 49.90
3 20.20 9.75 83.77 49.50
4 19.83 9.67 86.13 50.67
5 20.57 9.75 87.27 51.20
6 20.03 9.78 85.37 50.53
Grand Average 20.07 9.74 85.32 50.28
Reference Value 20 10 81 50
% difference 0.36% -2.64% 5.34% 0.57%5.3.3 Measurements by Glass Number
Exhibit D.4 in Appendix D provides plots of the leachate concentrations for each type of
submitted sample: the standards (multi-element solution standard, ARM, EA, and blanks) and the
study glasses (ccc and quenched). These plots allow for the assessment of the repeatability of the
measurements, which suggests some scatter in the triplicate values for some analytes for some of
the glasses. With the exception of the values for rcth-30, all of the triplicate values (for both
quenched and ccc versions) are extremely consistent. The values for B, Li, Na, and Si for the
rcth-30 samples appear to have a larger variation but do not present a practical concern. For
example, consider the B ppm values for rcth-30 which range from approximately 125 to 175 ppm.
These values will not translate into a significant or practical difference during the durability
assessment. Therefore, none of the ppm values have been excluded from the calculations that
follow.
5.3.4 Quenched versus Centerline Canister Cooled PCTs
Exhibits D.5 and D.6 in Appendix D provide a closer look at the effect of heat treatment on the
PCTs for the study glasses using the averages of the ppm values and of the logarithms of these
values, respectively. These exhibits provide paired t-tests between the quenched and ccc PCTs
for the study glasses for each of the four elements of interest. None of these differences appear to
be statistically significant at a significance level of 5%. However, this does not suggest that
significant differences between quenched and ccc views of individual glasses will not be
observed.30
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Peeler, D.K. The Impact of Higher Waste Loading on Glass Properties: The Effects of Uranium and Thorium, report, December 2, 2003; South Carolina. (https://digital.library.unt.edu/ark:/67531/metadc739213/m1/40/: accessed April 30, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.