Oxalate Mass Balance During Chemical Cleaning in Tank 5F

Poirier, M. ; Fink, S.

关键词: AR FACILITIES;    ANIONS;    CATIONS;    CLEANING;    CLOSURES;    MASS BALANCE;    NITRIC ACID;    OXALATES;    OXALIC ACID;    PERSONNEL;    REMOVAL;    SAVANNAH RIVER PLANT;    SLUDGES;    TANKS;   

DOI  :  10.2172/1021332
RP-ID  :  SRNL-STI-2011-00402
PID  :  OSTI ID: 1021332
Others  :  TRN: US1103962

学科分类：核能源与工程

美国|英语

来源: SciTech Connect

【 摘 要 】

The Savannah River Site (SRS) is preparing Tank 5F for closure. The first step in preparing the tank for closure is mechanical sludge removal. Following mechanical sludge removal, SRS performed chemical cleaning with oxalic acid to remove the sludge heel. Personnel are currently assessing the effectiveness of the chemical cleaning to determine whether the tank is ready for closure. SRS personnel collected liquid samples during chemical cleaning and submitted them to Savannah River National Laboratory (SRNL) for analysis. Following chemical cleaning, they collected a solid sample (also known as 'process sample') and submitted it to SRNL for analysis. The authors analyzed these samples to assess the effectiveness of the chemical cleaning process. Analysis of the anions showed the measured oxalate removed from Tank 5F to be approximately 50% of the amount added in the oxalic acid. To close the oxalate mass balance, the author collected solid samples, leached them with nitric acid, and measured the concentration of cations and anions in the leachate.