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The void fraction of melter feed during nuclear waste glass vitrification

Published online by Cambridge University Press:  23 March 2015

Zachary J. Hilliard  and
Pavel R. Hrma
Zachary J. Hilliard
Affiliation:
Pacific Northwest National Laboratory, 902 Battelle Blvd, Richland WA, 99354, U.S.A.
Pavel R. Hrma
Affiliation:
Pacific Northwest National Laboratory, 902 Battelle Blvd, Richland WA, 99354, U.S.A. Division of Advanced Nuclear Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea
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Abstract

To efficiently vitrify Hanford waste, the melting process (i.e., melter feed turning into waste glass) must be modeled and optimized. The rate of heat transfer to the melter feed in a waste glass melter, and thus the rate of melting, is strongly affected by the melter feed porosity, especially in the final stages where the glass-forming melt produces foam that insulates the feed from the molten glass. The volume expansion test allows the determination of the melter feed porosity as a function of temperature. This test measures the profile area of the feed pellet as it turns into glass. This contribution presents the calculation of the void fraction (porosity) of the melter feed as a function of temperature, heating rate, and material parameters. The process of finding the void fraction is described as well as results from the application of this process.

Keywords

nuclear materialsphase transformationporosity
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1744: Symposium EE – Scientific Basis for Nuclear Waste Management XXXVIII , 2015 , pp. 107 - 112
Copyright
Copyright © Materials Research Society 2015 

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