Tank 41H Saltstone Regulatory Analyses Page: 6 of 42
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WSRC-TR-2004-00051
Revision 0
EXECUTIVE SUMMARY
A Saltstone waste form was prepared in the Savannah River Technical Center (SRTC)
shielded cells facility from a Tank 41H sample and Z-Area premix material. After a cure of
at least 28 days, samples of the Saltstone were collected and characterized. Results showed
that a Class 3 Industrial Solid Waste Landfill (ISWLF) would be required for disposal of this
Tank 41H Saltstone waste form because of high leachate nitrate and alpha-emitting
radionuclide concentrations.
1.0 INTRODUCTION
After evaluation of options for processing the Tank 41 salt solution, the SRS tank waste
closure strategy may include immobilization of this salt solution in the SRS Saltstone facility.
Tank 50 is the feed tank for the Saltstone process. In a separate study, the content of Tank 50
was sampled and immobilized in Saltstone. Results from characterization of this Tank 50
Saltstone have been documented as part of a separate report. Before initiating a treatment
process for the Tank 41 salt solution, the technical basis is being examined for the disposition
options.
Demonstration of a technical basis for immobilization of any waste stream in Saltstone
requires
-demonstrating the waste stream solution can be processed at the SRS Saltstone facility
-demonstrating the Saltstone waste form will qualify as a nonhazardous radioactive waste
-demonstrating the Saltstone waste form will be compatible with the disposal facility
Processability is established when characterization of a salt solution meets the Z-Area Waste
Acceptance Criteria (WAC).1 The WAC provides limits for radionuclide and chemical
constituents and for physical properties. In addition, Tank 412 and Tank 503 Saltstone have
been shown to qualify as nonhazardous radioactive waste forms. By passing the Toxicity
Characterization Leaching Procedure (TCLP) test for the D-Code constituents,4 Tank 41 and
50 Saltstones have now been shown to no longer display the characteristic of metal toxicity.
Demonstrating compatibility between the waste form and the disposal facility requires that a
determination be made as to whether a Class 1, 2, or 3 Industrial Solid Waste Landfill
(ISWLF) is required. This is based on the leachability of constituents of potential concern
(COPCs) from the waste form. Leachability is evaluated by comparison of results from
TCLP analyses to SCDHEC R.61-107.16 Subpart A 16.4 Maximum Contaminant Levels
(MCLs) and Primary Remediation Goals (PRGs).51
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FERRARA, D. Tank 41H Saltstone Regulatory Analyses, report, April 15, 2004; South Carolina. (https://digital.library.unt.edu/ark:/67531/metadc780578/m1/6/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.