Getter Incorporation into Cast Stone and Solid State Characterizations

September 28, 2016

Report

Getter Incorporation into Cast Stone and Solid State Characterizations

Washington River Protection Solutions (WRPS) is collecting relevant available data on waste forms for use as a supplemental immobilization technology, to provide the additional capacity needed to treat low-activity waste (LAW) in Hanford Site tanks and complete the tank waste cleanup mission in a timely and cost-effective manner. One candidate supplemental waste form, fabricated using a low-temperature process, is a cementitious grout called Cast Stone. Cast Stone has been under investigation for this application at Pacific Northwest National Laboratory (PNNL) since initial screening tests in FY13. This report is the culmination of work to lower the diffusivities of Tc and I from Cast Stone using getters. Getters are compounds added to a system designed to selectively sequester a species of interest to provide increased stability to the species. The work contained within this report is related to waste form development and testing and does not directly support the 2017 integrated disposal facility (IDF) performance assessment. However, this work contains valuable information which may be used in performance assessment maintenance past FY17, and in future waste form development. This report on performance characterization of Tc and I getters in Cast Stone fabricated with simulated LAW covers several areas of interest and major findings to WRPS:

Revised: December 13, 2016 | Published: September 28, 2016

Asmussen R.M., C.I. Pearce, A.R. Lawter, J.J. Neeway, B.L. Miller, B.D. Lee, and N.M. Washton, et al. 2016. Getter Incorporation into Cast Stone and Solid State Characterizations. PNNL-25577 Rev. 0;RPT-SLAW-003 Rev A. Richland, WA: Pacific Northwest National Laboratory.