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Demonstration of the defense waste processing facility vitrification process for tank 42 radioactive sludge – melter feed preparation

Published online by Cambridge University Press:  10 February 2011

T. L. Fellinger ,
N. E. Bibler ,
K. M. Marshall ,
C. L. Crawford  and
M. S. Hay
T. L. Fellinger
Affiliation:
Savannah River Technology Center, Westinghouse Savannah River Company, Aiken, S.C. 29808
N. E. Bibler
Affiliation:
Savannah River Technology Center, Westinghouse Savannah River Company, Aiken, S.C. 29808
K. M. Marshall
Affiliation:
Savannah River Technology Center, Westinghouse Savannah River Company, Aiken, S.C. 29808
C. L. Crawford
Affiliation:
Savannah River Technology Center, Westinghouse Savannah River Company, Aiken, S.C. 29808
M. S. Hay
Affiliation:
Savannah River Technology Center, Westinghouse Savannah River Company, Aiken, S.C. 29808
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Abstract

The Defense Waste Processing Facility (DWPF), at the Savannah River Site (SRS), is processing and immobilizing the radioactive high level waste sludge at SRS into a durable borosilicate glass for final geological disposal. The DWPF is currently processing the second, million gallon batch of radioactive sludge. This second batch is primarily from Tank 42. Each time a new batch of radioactive sludge is to be processed by the DWPF, the process flowsheet is to be tested and demonstrated to ensure an acceptable melter feed and glass can be made. This demonstration was completed in the Shielded Cells Facility in the Savannah River Technology Center at SRS.

This paper presents the processing and offgas data, and compositional analyses obtained during the preparation of a melter feed for this demonstration. A second paper in this conference describes the properties of the glass produced from this feed. The demonstration used Tank 42 sludge slurry and the DWPF process control strategy for blending the sludge slurry with Frit 200 to make an acceptable melter feed. To prepare feed for the melter, the flowsheet requires that the radioactive sludge slurry be treated with nitric and formic acid to adjust rheology and remove mercury. During this step, hydrogen is formed from the decomposition of the formic acid. The acidified sludge slurry is then mixed with the prescribed amount of glass forming frit and evaporated to the proper weight percent solids to prepare feed to the melter. During this step hydrogen is also formed. Results indicate that the H2 generation rate is below the DWPF safety limits and an acceptable melter feed was produced.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 556: Symposium QQ – Scientific Basis for Nuclear Waste Management XXII , 1999 , 199
Copyright
Copyright © Materials Research Society 1999

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References

REFERENCES

1. Office of Environmental Restoration and Waste Management, Waste Acceptance Product Specifications for Vitrified High-Level Waste Forms, Revision 2, USDOE Document EM-0093, U.S. Department of Energy, Germantown, MD, 1996.Google Scholar
2. Bibler, N. E., Fellinger, T. L., Crawford, C. L., Marshall, K. M., and Edwards, T. B., Demonstration of the Defense Waste Processing Facility Vitrification Process for Tank 42 Radioactive Sludge - Glass Preparation and Results, Mater. Res. Soc. Proc. These Proceedings, Boston, MA., 1998.Google Scholar
3. Kinard, W. F., Bibler, N. E., Coleman, C. J., and Dewberry, R. A., J. Radioanal. Nucl. Chem., Vol.219, pp.197, 1997.Google Scholar
4. Smith, G. L., Characterization of Analytical Reference Glass I (ARG-»), PNNL-8992, Pacific Northwest Laboratory Report, (12/93).Google Scholar
5. Coleman, C.J., Bibler, N.E., Ferrara, D.M. and Siegwald, S.F., Reaction of Formic and Nitric Acids with Savannah River Site Radioactive HIWSludge in the DWPF Pretreatment Steps, Nuclear and Hazardous Waste Management- Spectrum 94, pp. 737–741, August 1994.Google Scholar
6. Hsu, C. W. and Ritter, J. A., Treatment of Simulated High-Level Radioactive Waste with Formic Acid: Bench-Scale Study on Hydrogen, Nuclear Technology, Vol.16, pp. 196-207, November 1996.Google Scholar