In decommissioning a nuclear power plant, numerous concrete structures need to be demolished and decontaminated. Although concrete decontamination technologies have been developed globally, concrete cutting remains problematic due to the secondary waste production and dispersion risk from concrete scabbling. To minimize workers’ radiation exposure and secondary waste in dismantling and decontaminating concrete structures, the following conceptual designs were developed. A micro-blast type scabbling technology using explosive materials and a multi-dimensional contamination measurement and artificial intelligence (AI) mapping technology capable of identifying the contamination status of concrete surfaces. Trials revealed that this technology has several merits, including nuclide identification of more than 5 nuclides, radioactivity measurement capability of 0.1–107 Bq·g−1, 1.5 kg robot weight for easy handling, 10 cm robot self-running capability, 100% detonator performance, decontamination factor (DF) of 100 and 8,000 cm2·hr−1 decontamination speed, better than that of TWI (7,500 cm2·hr−1). Hence, the micro-blast type scabbling technology is a suitable method for concrete decontamination. As the Korean explosives industry is well developed and robot and mapping systems are supported by government research and development, this scabbling technology can efficiently aid the Korean decommissioning industry.

1. Introduction
2. Development of Micro-Blast TypeScabbling Technology
    2.1 Background
    2.2 Necessity of Adoption of Micro-Blast TypeScabbling Technology
    2.3 Characteristics of Micro-Blast Type ScabblingTechnology
    2.4 Technology Situation for Decontaminationof Concrete Structure
    2.5 Outline of Development of Micro-BlastType Scabbling Technology
3. Conclusions
Acknowledgements
REFERENCES

• Kyungho Lee(ORION ENC, 37, Seongsui-ro 22-gil, Seongdong-gu, Seoul 04798, Republic of Korea)
• Sewon Chung(ORION ENC, 37, Seongsui-ro 22-gil, Seongdong-gu, Seoul 04798, Republic of Korea)
• Kihyun Park(ORION ENC, 37, Seongsui-ro 22-gil, Seongdong-gu, Seoul 04798, Republic of Korea)
• SeongHee Park(ORION ENC, 37, Seongsui-ro 22-gil, Seongdong-gu, Seoul 04798, Republic of Korea) Corresponding author