COMPUTER MODELING OF HIGH-LEVEL WASTE GLASS TEMPERATURES WITHIN DWPF CANISTERS DURING POURING AND COOL DOWN Page: 6 of 69
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SRNL-STI-201 1-00546
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EXECUTIVE SUMMARY
This report describes the results of a computer simulation study to predict the temperature of the
glass at any location inside a DWPF canister during pouring and subsequent cooling. These
simulations are an integral part of a larger research focus aimed at developing methods to predict,
evaluate, and ultimately suppress nepheline formation in HLW glasses. That larger research
focus is centered on holistically understanding nepheline formation in HLW glass by exploring
the fundamental thermal and chemical driving forces for nepheline crystallization with respect to
realistic processing conditions. Through experimental work, the goal is to integrate nepheline
crystallization potential in HLW glass with processing capability to ultimately optimize waste
loading and throughput while maintaining an acceptable product with respect to durability.
The results of this study indicated severe temperature gradients and prolonged temperature dwell
times exist throughout different locations in the canister and that the time and temperatures that
HLW glass is subjected to during processing is a function of pour rate. The simulations indicate
that crystallization driving forces are not uniform throughout the glass volume in a DWPF (or
DWPF-like) canister and illustrate the importance of considering overall kinetics (chemical and
thermal driving forces) of nepheline formation when developing methods to predict and suppress
its formation in HLW glasses.
The intended path forward is to use the simulation data both as a driver for future experimental
work and, as an investigative tool for evaluating the impact of experimental results. Simulation
data will be used to develop laboratory experiments to more acutely evaluate nepheline formation
in HLW glass by incorporating the simulated temperatures throughout the canister into the
laboratory experiments. Concurrently, laboratory experiments will be performed to identify
nepheline crystallization potential in HLW glass as a function of time and temperature, the results
of which will be fed back into simulations to evaluate the potential impacts. Through an iterative
process involving computer simulations and experimental results, the potential for nepheline
crystallization in HLW glass can be predicted, evaluated, and suppressed to maximize waste
loading and throughput of canisters.
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Amoroso, J. COMPUTER MODELING OF HIGH-LEVEL WASTE GLASS TEMPERATURES WITHIN DWPF CANISTERS DURING POURING AND COOL DOWN, report, October 9, 2011; United States. (https://digital.library.unt.edu/ark:/67531/metadc836202/m1/6/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.