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High-radiation-exposure work in Korean pressurized water reactors
송창주,공태영,김성준,손진호,김화평,김지웅,박재옥,김희근,김용권 한국원자력학회 2024 Nuclear Engineering and Technology Vol.56 No.5
Owing to strict radiation safety management in Korean nuclear power plants (NPPs), most radiation workers receive very low radiation doses, even lower than the annual dose limit for the general public. However, the occupational dose distribution indicates that some Korean NPP workers receive a relatively higher dose than the average dose. This inequity in radiation exposure could be reduced by providing customized radiation protection measures, such as dose constraints, to workers receiving relatively higher doses. In this study, dose normalization was performed to identify the highest radiation exposure work in Korean pressurized water reactors (PWRs). The results show that most of the occupational exposure in Korean PWRs occurs during the planned maintenance period. Finally, the three highest radiation exposure tasks in Korean PWRs were identified: nozzle dam installation and removal, eddy current testing, and man-way opening and closing.
송창주,공태영,김성준,손진호,최우석,김화평,김지웅,김희근 (사)한국방사선산업학회 2023 방사선산업학회지 Vol.17 No.2
A graded approach applies safety requirements differentially, depending on the risk potential. An advantage of applying a graded approach is that safety assessments can be conducted repeatedly byfocusing on areas with relatively higher risk than on those with low risk when decommissioning a nuclearpower plant (NPP). The International Atomic Energy Agency (IAEA) recommends applying a gradedapproach to decommissioning NPPs worldwide. In Korea, the definition of the graded approach requiresto be clarified. This study compared the decommissioning method used in Korean NPPs with the IAEAgraded approach and examined whether the graded approach can be applied to decommissioning NPPsin Korea. As a result of the comparison, the preliminary decommissioning plan for Shin-Kori Units 5 and6 showed that the decommissioning method for Korean NPPs is similar to the five-step IAEA gradedapproach.