Destruction Characteristics Of
Irradiated Graphite Waste At
Various Waste Thermal Conditions
Author(s)
H. C. Yang, D. G. Lee, H. C. Eun, J. H. Lee, K. W. Lee
& W. Z. Oh
Abstract
This study investigated the thermal destruction characteristics of nuclear graphite
waste at up to 1000 °C for various waste thermal conditions. The purpose of this
study is to get some useful data that are required to design a thermal treatment
furnace for nuclear graphite waste. The basic design and operating parameters,
such as temperature, heating rate and gaseous atmosphere, on the graphite
decomposition characteristics were investigated using a thermo-gravimetric
analyser (TGA) coupled with a gas chromatography-mass spectrometer (GC-MS)
system. The tested graphite was not easily destroyed in oxygen-deficient
conditions. No significant amount of the products of incomplete combustion was
formed even in the limited oxygen concentration of 4% O2. However, the
oxidation reaction was found to be very effective in the presence of oxygen. It
could therefore be said that direct incineration would be very effective to reduce
the volume of nuclear graphite waste. The influence of temperature and oxygen
partial pressure was evaluated by the theoretical model analysis of thermo-gravimetric
data. The activation energy and the reaction order of graphite
oxidation were evaluated as 128 kJ/mol and 1.1, respectively.
1 Introduction
Graphite has been used as a moderator and reflector of neutrons in many nuclear
reactors. The old graphite moderated reactors have been shut down and.
decommissioning of an old graphite reactor generates a huge amount of
radioactive graphite waste. The radioactive graphite waste has different
characteristics compared to other radioactive waste due to its physical and
Keywords
Related Book
Other papers in this volume
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