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Heat Exchanger Fouling and Cleaning VII
July 1-6, 2007 - Tomar, Portugal
| Editors: |
Hans Müller-Steinhagen, Institute of Technical Thermodynamics, German Aerospace Centre (DLR)
and Institute for Thermodynamics and Thermal Engineering, University of Stuttgart, Germany
M. Reza Malayeri, University of Stuttgart, Germany
A. Paul Watkinson, The University of British Columbia, Canada |
The articles for these proceedings are peer-reviewed.
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CRYSTALLIZATION FOULING BEHAVIOUR OF URANIUM OXIDE AND ALUMNOSILICATE SCALE IN HIGH LEVEL NUCLEAR WASTE MEDIUM
Jonas Addai-Mensah, Ian Wark Research Institute, ARC Special Research Centre, University of South Australia. Mawson Lakes, Adelaide. 5095. SA. Australia
Jun Li, Ian Wark Research Institute, ARC Special Research Centre, University of South Australia. Mawson Lakes, Adelaide. 5095. SA. Australia
Bill Wilmarth, Westinghouse Savannah River National Laboratory Aiken, South Carolina, USA
ABSTRACT:
During high level nuclear waste (HLNW) liquor
processing in evaporators operating in the temperature
range 30 - 140 °C, dissolved silica, alumina, sodium
hydroxide, uranium-235 and transuranic species (e.g.
plutonium-238) invariably become concentrated. As the
liquor evaporation proceeds, the sodium aluminosilicate
(SAS) and radionuclides may exceed their solubility limits
and co-precipitate, fouling the tubes and walls of the
evaporator. If the fouling process is not effectively
controlled or mitigated, radionuclide scale accumulation
exceeding the critical mass necessary for self-sustaining
nuclear fission reaction may proceed at an alarming rate,
posing a serious criticality concern.
To probe the mechanisms underpinning uranium
oxide-sodium aluminosilicate co-crystallization fouling,
fundamental studies simulating the process were
undertaken. New knowledge and greater understanding
gleaned from the present work comprise crystallo-chemical
structure characteristics, solubility and the fouling
mechanisms involved in the mixed oxides scale deposition.
The implications of the findings with regards to uraniumbased
scale formation in HLNW plants are highlighted.
Jonas Addai-Mensah, Jun Li, and Bill Wilmarth, "CRYSTALLIZATION FOULING BEHAVIOUR OF URANIUM OXIDE AND ALUMNOSILICATE SCALE IN HIGH LEVEL NUCLEAR WASTE MEDIUM" in "Heat Exchanger Fouling and Cleaning VII", Hans Müller-Steinhagen, Institute of Technical Thermodynamics, German Aerospace Centre (DLR)
and Institute for Thermodynamics and Thermal Engineering, University of Stuttgart, Germany
M. Reza Malayeri, University of Stuttgart, Germany
A. Paul Watkinson, The University of British Columbia, Canada
Eds, ECI
Symposium Series, Volume RP5 (2007). http://services.bepress.com/eci/heatexchanger2007/13
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