Comparison of simulants to actual neutralized current acid waste: process and product testing of three NCAW core samples from Tanks 101-AZ and 102-AZ

Abstract

Reprint of historical document PVIPC9Sm.03E. dated September 1995. Data. formaaing. and ocher mnvcntiom refla standards at thc original dak of printing. Technical p a r review and cdilorii reviews may m have been pufamcd. DISCLAIMERThis report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor Esnelle Memorial Institute, nor any of their employees, makes any warranty, express or implied, or assurnesany legal liability or responsibility forthe accuracy, completeness, or.usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by 'trade name, trzdemark, manufacturer, or othenvise h 2 s not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof, or Banelle Memorial Institute. Project to test and model simulated waste to support design, feed processibility, operations, permitting, safety, and waste-form qualification. Parallel testing with actual radioactive waste is being performed on a laboratory-scale to c o n f i r m the validity of using simulants and. glass property . models developed from simulants.Laboratory-scale testing has been completed on three radioactive core samples from tanks 101-AZ and 102-AZ containing neutralized.current ac.id waste (NCAW), which is one of the first waSte types to be.processed in the high-level waste vitrification plant under a privatization scenario.Properties of the radioactive waste measured during process and product testing were compared to simulant properties and model predictions to donfirm 'the validity of simulant and glass property models work. This repoh includes,re&s from the three NCAW core samples, comparable results from slurry and glass simulants, and comparisons to glass property model predictions. Experimental Approach 'The three NCAW samples were retrieved from the tanks in cylindrical segments 1 .inchin ' ' diameter and 19 inches long. Several segments representing a complete vertical sample of the settled solids in the tank were combined and blended to make up a core sample. Solids from each core sample were pretreated using a water wash/settle/decant process, including a ferric-nitrate flocculent additive, settle/decant, and two water washes (3 volunies deionized water to 1 volume solids). The washed solids were then characterized chemically, radiochemically, physically, and rheologically (101-AZ Core 1 only). After adjusting the samples to 125 g waste oxide& the waste was trea'ted with formic acid to adjust the feed rheology and to reduce the redox-sensitive species for introduction into the melter,. Off-gas analysis during formic acid addition was performed on 102-AZ Core 2 and . is described in a'separate report.") The formated slurry samples were characterized chemically, physically, and rheologically. Frit was added to ...

Review of the Scientific Understanding of Radioactive Waste at the U.S. DOE Hanford Site

“…Knowledge of the PSD of both insoluble and soluble Hanford waste solids is needed to support design of systems that retrieve, transport, mix, and treat these wastes. Particle size measurements have been performed on numerous core and auger samples taken from the Hanford tanks as part of waste characterization, retrieval, safety, and pretreatment projects. ,,,,− ,,,,,,,,− Despite the large body of work on waste PSD, not all tanks have been characterized, and many existing measurements are outdated due to transfers into tanks and/or chemical aging of the tank constituents. Furthermore, Hanford PSD measurements lack coherency due to the use of variable methodologies applied under different conditions.…”

Mixing Envelope D Sludge with LAW Intermediate Products with and without Glass Formers

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