원전 해체 공정 시 발생하는 방사성 에어로졸로 인한 작업종사자의 내부피폭평가 연구

Abstract

Kori unit #1, which is the first commercial nuclear power plant in Korea, was permanently shutdown in June 2017, and it is about to be decommissioned. Currently in Korea, researches on the decommissioning technology are actively conducted, but ther e are few researches on workers internal exposure to radioactive aerosol that is generated in the process of decommissioning nuclear power plant. As a result, the over-exposure of decommissioning workers is feared, and the optimal working time needs to be derived in consideration of radioactive aerosol. This study investigated the growth and dynamics of aerosol, which can be used as an indicator in evaluating the internal exposure of the workers due to radioactive aerosol generated in the process of decommissioning nuclear power plants. Also, to evaluate it, the authors compared and analyzed the cases of aerosol generated when activated pipes are cutting, metal melting in the process of nuclear power plants and the codes for evaluating internal exposure. Based on the evaluation of internal exposure through evaluation code and analyzed data, this paper will be used as a measure of work time to prevent over exposure of workers in the process of decommissioning.