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

JOURNAL OF HAZARDOUS MATERIALS

卷:400

Article

Sow, Mamadou¹  Leblois, Yohan¹  Bodiot, Cecile¹  Motzkus, Charles²  Ritoux, Sebastien²  Gensdarmes, Francois¹ 

[1] Inst Radioprotect & Surete Nucl IRSN, SCA, LPMA, PSN Res, F-91192 Gif Sur Yvette, France

[2] Ctr Sci & Tech Batiment CSTB, Div Agents Biol & Aerocontaminants, 84 Ave Jean Jaures, F-77420 Champs Sur Marne, France

关键词: Dismantling;    Airborne release;    Concrete;    Scarifying;    Aerosol;   

DOI  :  10.1016/j.jhazmat.2020.123077

来源: Elsevier

【 摘 要 】

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 and containment techniques. We characterize experimentally the ARF resulting from milling operations on a standard non-radioactive 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 mu m 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 x 10(-4); the maximum ARF estimated when no suction device is used is on the order of 0.5. As the study is focused on non-radioactive concrete, transposition of aerosol characteristics investigated in this study to assess radioactive airborne release is only relevant for indepth neutron activation on elemental compounds of concrete.

【 授权许可】

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