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Title: Cold Crucible Vitrification of CST and Simulated Hanford Tank Waste

Abstract

The Direct Feed Low-Activity Waste (DFLAW) flowsheet provides for the early production of immobilized low-activity waste (ILAW) by feeding low-activity waste (LAW) from tank farms to the Hanford Tank Waste Treatment and Immobilization Plant (WTP) LAW Facility for immobilization. Prior to the transfer of feed to the WTP LAW Vitrification Facility, tank supernatant waste will be pretreated by the Tank Side Cesium Removal (TSCR) system to meet the WTP LAW waste acceptance criteria (<3.18×10-5 Ci 137Cs/mole of Na). This pretreatment will remove cesium from the waste stream through ion exchange (IX). The selected media for IX is crystalline silicotitanate (CST). The Cs is not easily removed from the CST; thus, the CST is described as non-elutable and will need to be managed with high 135Cs and 137Cs activity post processing. This report addresses the crucible vitrification of the cold (non-radioactive) CST medium into simulated high-level waste (HLW) glass to demonstrate vitrification of CST with other fractions of the waste during HLW operations and to develop a formulation of a CST-bearing melter feed. Initially, three glass compositions were chosen based on fitting glass models to the CST composition and HLW composition to be used in the vitrification of the actual spentmore » CST and actual Hanford tank waste while trying to maximize the CST loading in the glass. After preparation and initial analysis, these glasses were all heavily crystalline and another composition was chosen. This glass was prepared and was composed of simulated CST ion exchange media and HLW along with added glass forming chemicals. This glass was melted and fully characterized by canister centerline cooling (CCC), crystal fraction, Product Consistency Test (PCT), Toxicity Characteristic Leaching Procedure (TCLP), viscosity, and electrical conductivity.« less

Authors:
 [1]; ORCiD logo [1];  [1];  [1];  [1]; ORCiD logo [1]; ORCiD logo [1]
  1. BATTELLE (PACIFIC NW LAB)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1575237
Report Number(s):
PNNL-28895
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English

Citation Formats

Russell, Renee L., Kim, Dong-Sang, Vienna, John D., Gervasio, Vivianaluxa, Skidmore, Chloe H., Riley, Brian J., and Peterson, Reid A. Cold Crucible Vitrification of CST and Simulated Hanford Tank Waste. United States: N. p., 2019. Web. doi:10.2172/1575237.
Russell, Renee L., Kim, Dong-Sang, Vienna, John D., Gervasio, Vivianaluxa, Skidmore, Chloe H., Riley, Brian J., & Peterson, Reid A. Cold Crucible Vitrification of CST and Simulated Hanford Tank Waste. United States. doi:10.2172/1575237.
Russell, Renee L., Kim, Dong-Sang, Vienna, John D., Gervasio, Vivianaluxa, Skidmore, Chloe H., Riley, Brian J., and Peterson, Reid A. Wed . "Cold Crucible Vitrification of CST and Simulated Hanford Tank Waste". United States. doi:10.2172/1575237. https://www.osti.gov/servlets/purl/1575237.
@article{osti_1575237,
title = {Cold Crucible Vitrification of CST and Simulated Hanford Tank Waste},
author = {Russell, Renee L. and Kim, Dong-Sang and Vienna, John D. and Gervasio, Vivianaluxa and Skidmore, Chloe H. and Riley, Brian J. and Peterson, Reid A.},
abstractNote = {The Direct Feed Low-Activity Waste (DFLAW) flowsheet provides for the early production of immobilized low-activity waste (ILAW) by feeding low-activity waste (LAW) from tank farms to the Hanford Tank Waste Treatment and Immobilization Plant (WTP) LAW Facility for immobilization. Prior to the transfer of feed to the WTP LAW Vitrification Facility, tank supernatant waste will be pretreated by the Tank Side Cesium Removal (TSCR) system to meet the WTP LAW waste acceptance criteria (<3.18×10-5 Ci 137Cs/mole of Na). This pretreatment will remove cesium from the waste stream through ion exchange (IX). The selected media for IX is crystalline silicotitanate (CST). The Cs is not easily removed from the CST; thus, the CST is described as non-elutable and will need to be managed with high 135Cs and 137Cs activity post processing. This report addresses the crucible vitrification of the cold (non-radioactive) CST medium into simulated high-level waste (HLW) glass to demonstrate vitrification of CST with other fractions of the waste during HLW operations and to develop a formulation of a CST-bearing melter feed. Initially, three glass compositions were chosen based on fitting glass models to the CST composition and HLW composition to be used in the vitrification of the actual spent CST and actual Hanford tank waste while trying to maximize the CST loading in the glass. After preparation and initial analysis, these glasses were all heavily crystalline and another composition was chosen. This glass was prepared and was composed of simulated CST ion exchange media and HLW along with added glass forming chemicals. This glass was melted and fully characterized by canister centerline cooling (CCC), crystal fraction, Product Consistency Test (PCT), Toxicity Characteristic Leaching Procedure (TCLP), viscosity, and electrical conductivity.},
doi = {10.2172/1575237},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {8}
}