Kori Unit 1, the first commercial nuclear power plant (NPP) in Korea, was permanently shut down in 2017 and was scheduled for decommissioning. Various programs must be planned early in the decommissioning process to safely decommission NPPs. Radiological characterization is a key program in decommissioning and should be a high priority. Radiological characterization involves determining the decommissioning technology to be applied to a nuclear facility by identifying the radiation sources and radioactive contaminants present within the facility and assessing the extent and nature of the radioactive contaminants to be removed from the facility. This study introduces the regulatory requirements, procedures, and implementation methods for radiological characterization and proposes a methodology to link the results of radiological characterizations for each stage. To link radiological characteristics, this study proposes to conduct radiological characterization in the decommissioning phase to verify the results of radiological characterization in the transitional phase of decommissioning NPPs. This enables significantly reducing the scope and content of radiological characterization that must be performed in the decommissioning phase and maintaining the connection with the previous phase.

1. Introduction
2. Materials and Methods
3. Results and Discussions
    3.1 Korean Regulatory Requirements forRadiological Characterization
    3.2 Procedures and Methods of RadiologicalCharacterization
    3.3 Methodology to Link the Results ofRadiological Characterizations
4. Conclusion
Conflict of Interest
Acknowledgements
REFERENCES

• Jaeok Park(Chosun University, 10, Chosundae 1-gil, Dong-gu, Gwangju 61452, Republic of Korea)
• Tae Young Kong(Chosun University, 10, Chosundae 1-gil, Dong-gu, Gwangju 61452, Republic of Korea) Corresponding author
• Seongjun Kim(Chosun University, 10, Chosundae 1-gil, Dong-gu, Gwangju 61452, Republic of Korea)
• Jinho Son(Chosun University, 10, Chosundae 1-gil, Dong-gu, Gwangju 61452, Republic of Korea)
• Changju Song(Chosun University, 10, Chosundae 1-gil, Dong-gu, Gwangju 61452, Republic of Korea)
• Jiung Kim(Chosun University, 10, Chosundae 1-gil, Dong-gu, Gwangju 61452, Republic of Korea)
• Seungho Jo(Chosun University, 10, Chosundae 1-gil, Dong-gu, Gwangju 61452, Republic of Korea)
• Hee Geun Kim(Uiduk University, 261, Donghae-daero, Gangdong-myeon, Gyeongju-si, Gyeongsangbuk-do 38004, Republic of Korea)