Combustion aerosols formed during burning of radioactively contaminated materials: Experimental results

Abstract

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Contribution to the study of particle resuspension kinetics during thermal degradation of polymers

“…Similarly to the results reported by previous authors [15], we present in Fig. 1 a summary of available data on airborne release fractions (ARF: mass of contaminant released in aerosol form divided by the overall mass of contaminant deposited) for the glove box materials most commonly used in the nuclear industry (mainly Plexiglas TM PMMA and LEXAN TM PC) and for main contaminant particles (UO 2 [6,7]; 80% UO 2 -20% PuO 2 [8,9]; CeO 2 [10,12,14]; 84% CeO 2 -16% EuO 2 [13,14]; CsCl [14]; Co 2 O 3 [14]; La 2 O 3 [14]). It is clearly apparent that a significant discrepancy could be identified between the results obtained from different experimental studies.…”

“…Indeed, the results obtained by several authors [7,13] reveal that the sample type (i.e. polymer composition) has an impact on the quantity of aerosol released.…”

“…Nevertheless, regarding airborne releases in the event of a polymer fire, several experimental studies are reported in the literature addressing different scales (i.e. from the analytical scale [6][7][8][9][10][11][12] to the real scale [13,14]), contaminants (oxide and salt) and fire conditions (flaming, non-flaming). Similarly to the results reported by previous authors [15], we present in Fig.…”

Radioactive Aerosols Emission in Fires

“…Extensive research has been done and computer codes such as FIRIN, described by Ballinger et al (19891, have been developed to estimate the source term release of smoke and radioactive particles from potential fires. The current code FIRIN radioactive source term model is based on the results of a series of small scale experiments made by Halverson (1987) measuring the fractional release from specific types of fire accidents. Experiments have been made with 5.7 diameter circles of 1.27 cm thick Plexiglas.…”

Supplemental analysis of accident sequences and source terms for waste treatment and storage operations and related facilities for the US Department of Energy waste management programmatic environmental impact statement

“…The fluidlike plastic would tend to overlaykoat other combustibles, such as cellulosics, and retard their vapor generation. Contamination as solid particles on the surface or in the materials sinks through the molten plastic (Halverson et al 1986), and the particle generated must pass through any ash layer to be released from the package. For these reasons, the RARF is bounded by the experimentally measured value of 4E-5.…”