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Aerosol release fraction by concrete scarifying operations and its radiological impacts on the dismantling of nuclear facilities

Abstract : The sanitation of concrete structures through dismantling of nuclear buildings is complicated by the radiological threat associated with the airborne release of fine dust. This is the reason why the aerosol release fraction (ARF) associated with mechanical removal of concrete structure containing radioactivity needs to be accurately evaluated to implement efficient radiological survey. We characterize experimentally the ARF resulting from milling operations on a standard concrete slab in a confined experimental chamber using an industrial scarifying machine. Our results reveal a significant production of fine aerosol particles with a mass median aerodynamic diameter close to 4 µm and which mineralogical composition is dominated by calcium and silica compounds. The ARF measured when a vacuum suction device is used to confine the dust production close to the source is on the order of 5×10-4; the maximum ARF estimated when no suction device is used is on the order of 0.5.
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Submitted on : Friday, July 10, 2020 - 9:00:33 PM
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Mamadou Sow, Yohan Leblois, Cecile Bodiot, Charles Motzkus, Sebastien Ritoux, et al.. Aerosol release fraction by concrete scarifying operations and its radiological impacts on the dismantling of nuclear facilities. Journal of Hazardous Materials, Elsevier, 2020, 400 (123077), pp.1-10. ⟨10.1016/j.jhazmat.2020.123077⟩. ⟨hal-02896862⟩

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