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IRSN, Institut de radioprotection et de sûreté nucléaire

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Incandescent particle characterization emitted by some cutting techniques during dismantling operations and measuring effects on filters

Pierre Marchal has defended his thesis on 26th November 2014 at Saclay's INSTN.​

Document type > *Mémoire/HDR/Thesis

Keywords >

Research Unit > IRSN/DSU/SERAC/LECEV

Authors > MARCHAL Pierre

Publication Date > 26/11/2014

Summary

Fire hazards while metal cutting on dismantling operations led IRSN to focus a study on incandescent particles emitted by these cutting tools and their impact on air filter. If microniques particles (< 10 μm) have been studied for their negative impact on human health, few studies are dealing with incandescent particles, despite their strong thermal energy. These particles are mainly made of iron, coming from the metal cutting, and the exothermic oxidation reaction coupled to a high temperature emission causes them to molt. An experimental system was designed, representative of dismantling operations with instrumentations adapted for in-flight particles measurement, such as size, velocity and temperature. The particles are characterized from the emission source (automated cut-off grinder) and all along their path into the ventilation duct to their impact on a filter. An analytical approach of the impact of these particles on the filter shows that the temperature of the particles, greater than 430 °C damages the filter medium, and may reduce the filter thickness or perforate it, which leads to a decrease of its filtration efficiency determined according to the French standard. Comparison between the characteristics of the particles and the filtration efficiency has permitted to establish empirical correlations in order to predict the loss of filtration efficiency versus the cutting parameters and some good practices have been proposed to protect the filter.

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