|About this Abstract
||Materials Science & Technology 2012
||Materials Issues in Nuclear Waste Management in the 21st Century
||REDuction/OXidation (REDOX) Modeling and Process Control in the Defense Waste Processing Facility (DWPF): Impacts of Antifoam and Ar Bubbling
||Carol M. Jantzen, Fabienne C. Johnson, Michael E. Stone, Connie Cicero Herman
|On-Site Speaker (Planned)
||Connie Cicero Herman
Control of the REDuction/OXidation (REDOX) state of glass in High Level Waste (HLW) melters, such as the Defense Waste Processing Facility (DWPF), is critical in order to eliminate the formation of metallic species from overly reduced melts while minimizing foaming from overly oxidized melts. The REDOX control is normally a balance of the oxidants and reductants from the feed and from processing additives but the recent addition of Ar bubbling to the melt pool has caused sparging of free oxygen from the melt. One reductant previously not included in the DWPF REDOX model was antifoam. The impact of this component during simulant testing and during radioactive melter campaigns is modeled. In addition, the impact of the Ar bubbling during radioactive melter campaigns will be discussed and quantified.