Impact of operating nuclear power plants to decommissioning workers

During the licensing phase of construction or operation, Domestic nuclear power plant operator should prove that if the radiation dose meet the dose criteria according to requirements of Article 16 (Prevention of Environmental Hazards) of Notification (Radiation 001. Standard for Radiation Protection) to protect the residents and the environment. In case of Kori Unit 1, Kori Unit 2 to 4 and ShinKori Unit 1 and 2 are adjacent in the same Kori site. Close to Kori site, there is Sae-wul site which include Shin Kori Unit 3 and 4 and Shin Kori 5 and 6 which is under construction now. Thus it is essentially required to evaluate the exposure dose to the decommissioning workers by operating multiple NPP units nearby. In 2023, decommissioning of Kori unit 1 will be started. In consideration of Kori 2 shutdown expected in 2023, we could consider only the impacts of Kori 3,4 and Shin-Kori 1⁓6. As a result, the annual maximum individual dose of the decommissioning workers is estimated to be 2.31E-03mSv/yr and it is insignificant compared to the effective dose limit of 1mSv/yr