Diffusion of Iodine and Rhenium in Category 3 Waste Encasement Concrete and Soil Fill Material

Technical Report · Fri Dec 15 00:00:00 EST 2006

DOI:https://doi.org/10.2172/900213· OSTI ID:900213

Wellman, Dawn M; Mattigod, Shas V; Whyatt, Greg A; Powers, Laura; Parker, Kent E; Wood, Marcus I

Assessing long-term performance of Category 3 waste cement grouts for radionuclide encasement requires knowledge of the radionuclide-cement interactions and mechanisms of retention (i.e. sorption or precipitation). This understanding will enable accurate prediction of radionuclide fate when the waste forms come in contact with groundwater. A set of diffusion experiments using carbonated and non-carbonated concrete-soil half cells was conducted under unsaturated conditions (4% and 7% by wt moisture content). Spiked concrete half-cell specimens were prepared with and without colloidal metallic iron addition and were carbonated using supercritical carbon dioxide. Spikes of I and Re were added to achieve measurable diffusion profile in the soil part of the half-cell. In addition, properties of concrete materials likely to influence radionuclide migration such as carbonation were evaluated in an effort to correlate these properties with the release of iodine and rhenium.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 900213
• Report Number(s): PNNL-16268; 830403000; TRN: US0702220
• Country of Publication: United States
• Language: English

Related Subjects

12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
36 MATERIALS SCIENCE
CARBON DIOXIDE
CEMENTS
CONCRETES
DIFFUSION
FORECASTING
GROUTING
IODINE
IRON ADDITIONS
MOISTURE
PRECIPITATION
RADIOISOTOPES
RADIONUCLIDE MIGRATION
RETENTION
RHENIUM
SOILS
SORPTION
WASTE FORMS
WASTES