Abstract: Radioactive liquid leakage accident is a typical radioactive accident in reprocessing facilities, which usually occurs in the equipment room. The generation of airborne radionuclides includes two processes: one is the release of inert gas from the solution during the leakage of radioactive liquid, and the aerosol generated by the interaction with air and floor; the other is the evaporation process after leakage (including before washing, before dilution and after dilution). The aerosol will deposit after being generated in the equipment room, and will be discharged to the environment after filtration along with the exhaust system of the equipment room. In this paper, a source term estimation method related to radioactive solution storage tank breach leakage accident is proposed. The estimation of accident leakage quality, leakage activity, airborne radioactivity concentration and integral concentration in equipment room, and environmental release source term are realized, which provides data support for emergency decision-making and response action.

Key words: emergency, reprocessing facilities, leakage, source term, airborne release