Iron-Enriched Basalt for Containment of Nuclear Wastes

Welch, J.M.; Schuman, R.P.; Sill, C.W.; Kelsey, P.V.; Henslee, S.P.; Tallman, R.L.; Horton, R.M.; Owen, D.E.; Flinn, J.E.; Idaho, Eg g

doi:10.1557/proc-6-23

Cited by 7 publications

(2 citation statements)

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“…The voltage and current in the circuit arc related by Ohm's Law, V = I R (9) and the resistance is approximated by…”

Section: Considerationsmentioning

confidence: 99%

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Bench-scale arc melter for R&D in thermal treatment of mixed wastes

Kong¹,

Grandy²,

Watkins³

et al. 1993

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A small dc arc melter was designed and constructed to run bench-scale investigations on various aspects of development for high-temperature (1,500-1,800°C) proccssing of simulatcd transuranic-contaminatcd waste and soil located at the Radioactive Waste Management Complex (RWMC). Several recent system design and treatment studies have shown that high-tempcrature melting is the preferred treatment. The small arc melter is needed to establish techniques and procedures (with surrogates) prior to using a similar melter with the transuranic-contaminatcd wastes in appropriate facilities at the site. This report documents the dcsign and construction, starting and heating procedures, and tests evaluating the mclter's ability to process several waste types stored at the RWMC. lt is found that a thin graphite strip provides reliable starting with initial high current capability for partially melting the soil/waste mixture. The heating procedure includes (1) the initial high current-low voltage mode, (2) a low current-high voltage mode that " commences after some slag has tbrmed and arcing dominates ovcr the receding graphite conduction path, and (3) a predominantly Joule heating mode during which thc currcnt can bc increased within the limits to maintain relatively quiescent operation. Scvcral experiments involving the melting of simulated wastes arc discussed. Energy balancc, slag tcmpcraturc, and electrode wear mcasurements are presented. Recommendations for further refinements to enhance its processing capabilities are identified. Future studies anticipated with the arc melter include waste form processing development; dissolution, retention, volatilization, and collection for transuranic and low-levcl radionuclides, as well as high vapor prcssure metals; clcctrode material development to minimize corrosion and erosion; refractory corrosion and/or skull formation effects; crucible or melter geometry; metal oxidation; and desirable melt reduction/oxidation (redox) conditions.

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“…The voltage and current in the circuit arc related by Ohm's Law, V = I R (9) and the resistance is approximated by…”

Section: Considerationsmentioning

confidence: 99%

“…This section documents the results of arc melter capability demonstration tests (Tests [8][9][10][11][12][13][14] for various simulated waste type compositions stored at the RWMC. The capability tests also evaluated the effects of material addition during arc melter operating conditions.…”

mentioning

confidence: 99%