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Title: Getter Incorporation into Cast Stone and Solid State Characterizations

Abstract

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 andmore » major findings to WRPS: investigating performance of potassium metal sulfide (KMS-2-SS) and tin (II) apatite (Sn-A) as Tc getters when incorporated into Cast Stone; investigating performance of silver exchanged zeolite (Ag-Z) and argentite (Arg) as I getters when incorporated into Cast Stone; utilizing sequential addition of Tc and I getters to overcome any deleterious interactions between the getters in solution; determining, for the first time, Tc distribution within the cured Cast Stone and its evolution during leaching; and performing solid state characterization of getters and Cast Stone samples to support leach test findings and develop a mechanistic understanding of the processes that control Tc and I release into solution.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1334894
Report Number(s):
PNNL-25577 Rev. 0; RPT-SLAW-003 Rev A
830403000; TRN: US1700816
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; WASTE FORMS; GETTERS; TANKS; TEMPERATURE RANGE 0273-0400 K; PERFORMANCE; HANFORD RESERVATION; LOW-LEVEL RADIOACTIVE WASTES; RADIOACTIVE WASTE PROCESSING; DIFFUSION; GROUTING; SIMULATION; REMEDIAL ACTION; IMMOBILIZATION

Citation Formats

Asmussen, Robert M., Lawter, Amanda R., Stephenson, John R., Bowden, Mark E., Washton, Nancy M., Neeway, James J., Du, Yingge, Pearce, Carolyn I., Clayton, Ray E., Saslow, Sarah A., Buck, Edgar C., Cordova, Elsa, and Qafoku, Nikolla. Getter Incorporation into Cast Stone and Solid State Characterizations. United States: N. p., 2016. Web. doi:10.2172/1334894.
Asmussen, Robert M., Lawter, Amanda R., Stephenson, John R., Bowden, Mark E., Washton, Nancy M., Neeway, James J., Du, Yingge, Pearce, Carolyn I., Clayton, Ray E., Saslow, Sarah A., Buck, Edgar C., Cordova, Elsa, & Qafoku, Nikolla. Getter Incorporation into Cast Stone and Solid State Characterizations. United States. doi:10.2172/1334894.
Asmussen, Robert M., Lawter, Amanda R., Stephenson, John R., Bowden, Mark E., Washton, Nancy M., Neeway, James J., Du, Yingge, Pearce, Carolyn I., Clayton, Ray E., Saslow, Sarah A., Buck, Edgar C., Cordova, Elsa, and Qafoku, Nikolla. Wed . "Getter Incorporation into Cast Stone and Solid State Characterizations". United States. doi:10.2172/1334894. https://www.osti.gov/servlets/purl/1334894.
@article{osti_1334894,
title = {Getter Incorporation into Cast Stone and Solid State Characterizations},
author = {Asmussen, Robert M. and Lawter, Amanda R. and Stephenson, John R. and Bowden, Mark E. and Washton, Nancy M. and Neeway, James J. and Du, Yingge and Pearce, Carolyn I. and Clayton, Ray E. and Saslow, Sarah A. and Buck, Edgar C. and Cordova, Elsa and Qafoku, Nikolla},
abstractNote = {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: investigating performance of potassium metal sulfide (KMS-2-SS) and tin (II) apatite (Sn-A) as Tc getters when incorporated into Cast Stone; investigating performance of silver exchanged zeolite (Ag-Z) and argentite (Arg) as I getters when incorporated into Cast Stone; utilizing sequential addition of Tc and I getters to overcome any deleterious interactions between the getters in solution; determining, for the first time, Tc distribution within the cured Cast Stone and its evolution during leaching; and performing solid state characterization of getters and Cast Stone samples to support leach test findings and develop a mechanistic understanding of the processes that control Tc and I release into solution.},
doi = {10.2172/1334894},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Sep 28 00:00:00 EDT 2016},
month = {Wed Sep 28 00:00:00 EDT 2016}
}

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