Pretreatment of Tc-Containing Waste and Its Effect on Tc-99 Leaching From Grouts

Conference · Sun Jul 01 04:00:00 EDT 2007

OSTI ID:21062428

Aloy, Albert; Kovarskaya, Elena N ^[1]; Harbour, John R; Langton, Christine A; Holtzscheiter, E William ^[2]

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1. RosAtom, 'V.G. Khlopin Radium Institute' (KRI), 2-nd Murinsky str., 28, Saint Petersburg, 194021 (Russian Federation)
2. Savannah River National Laboratory, Washington Savannah River Company, Aiken, SC 29808 (United States)

A salt solution (doped with Tc-99), that simulates the salt waste stream to be processed at the Saltstone Production Facility, was immobilized in grout waste forms with and without (1) ground granulated blast furnace slag and (2) pretreatment with iron salts. The degree of immobilization of Tc-99 was measured through monolithic and crushed grout leaching tests. Although Fe (+2) was shown to be effective in reducing Tc-99 to the +4 state, the strong reducing nature of the blast furnace slag present in the grout formulation dominated the reduction of Tc-99 in the cured grouts. An effective diffusion coefficient of 4.75 x 10{sup -12} (Leach Index of 11.4) was measured using the ANSI/ANS-16.1 protocol. The leaching results show that, even in the presence of a concentrated salt solution, blast furnace slag can effectively reduce pertechnetate to the immobile +4 oxidation state. The measured diffusivity was introduced into a flow and transport model (PORFLOW) to calculate the release of Tc-99 from a Saltstone Vault as a function of hydraulic conductivity of the matrix. (authors)

• Research Organization: Materials Research Society, 506 Keystone Drive, Warrendale, PA, 15086-7573 (United States)
• OSTI ID: 21062428
• Country of Publication: United States
• Language: English

Related Subjects

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
BLAST FURNACES
DIFFUSION
DOPED MATERIALS
GROUTING
HYDRAULIC CONDUCTIVITY
IRON COMPOUNDS
LEACHING
PERTECHNETATES
RADIONUCLIDE MIGRATION
REDUCTION
SALTS
TECHNETIUM 99
WASTE FORMS