Control of the reduction/oxidation potential of Hanford Waste Vitrification Plant feeds
A schematic diagram shows the various processing steps to be performed during feed preparation in the Hanford Waste Vitrification Plant (HWVP). The pretreated NCAW is transferred to the slurry receipt adjustment tank (SRAT) in the HWVP for concentration. Water removed during boildown is collected in the slurry mix evaporator condensate tank (SMECT). After waste treatment the water is returned to the storage tanks for eventual disposal. The pretreated Neutralized Current Acid Waste (NCAW) is concentrated in the SRAT to approximately 125 g waste oxides/ liter. Formic acid is then added at a controlled rate to improve rheological properties and achieve a required reduction/oxidation state. Reflux boiling is initiated and continued for several hours. The concentrated slurry is cooled and pumped to the slurry mix evaporator (SME). In the SME, glass frit is added, and the slurry is further concentrated to achieve a nominal composition of 500 g total oxides/liter. This waste/frit slurry is transferred to a melter feed tank (MFT) and continuously metered to a joule-heated ceramic melter where it is converted into a borosilicate glass. 2 figs.
- Research Organization:
- Westinghouse Hanford Co., Richland, WA (USA)
- DOE Contract Number:
- AC06-87RL10930
- OSTI ID:
- 6817093
- Report Number(s):
- WHC-SA-0269; CONF-880903-33; ON: DE89000514
- Country of Publication:
- United States
- Language:
- English
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053000 -- Nuclear Fuels-- Environmental Aspects
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
FORMIC ACID
HANFORD RESERVATION
HIGH-LEVEL RADIOACTIVE WASTES
INDICATORS
MANAGEMENT
MATERIALS
MODIFICATIONS
MONOCARBOXYLIC ACIDS
NATIONAL ORGANIZATIONS
ORGANIC ACIDS
ORGANIC COMPOUNDS
PH VALUE
PROCESSING
PUREX PROCESS
RADIOACTIVE EFFLUENTS
RADIOACTIVE MATERIALS
RADIOACTIVE WASTE MANAGEMENT
RADIOACTIVE WASTE PROCESSING
RADIOACTIVE WASTES
REDOX REACTIONS
REPROCESSING
SEPARATION PROCESSES
US DOE
US ERDA
US ORGANIZATIONS
VITRIFICATION
WASTE MANAGEMENT
WASTE PROCESSING
WASTES