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Abstract Digital twin technology is considered an ideal solution for optimizing nuclear power plant operation and enabling situation responsive monitoring under various scenarios. Korea Hydro & Nuclear Power has deployed a web-based digital twin of the APR1400 nuclear power plant as part of its plant digitalization strategy. To enhance the applicability of digital twin systems, the use of portable radiation measurement devices is required in addition to conventional fixed radiation monitoring instruments. Such portable systems support situation-responsive monitoring and enable the validation and updating of three-dimensional plant models. In this study, a digital twin based monitoring framework was demonstrated by combining LiDAR based three-dimensional plant model comparison with portable radiation measurements. Due to security constraints at nuclear power plants, the proposed approach was investigated at an accelerator-based monoenergetic neutron facility at the Korea Research Institute of Standards and Science. Radiation measurements were performed using a newly developed phoswich type detector composed of a CLYC scintillator and a plastic scintillator, designed for efficient portable measurements. The results demonstrate the feasibility of applying portable radiation detection systems to digital twin based monitoring for enhanced situational awareness in nuclear facilities.
Acknowledgment
This work was supported by the Korea Research Institute of Standards and Science (KRISS) (Grant No. GP2025-0008-01), the National Research Council of Science & Technology (NST) funded by the Ministry of Science and ICT (MSIT) (No. GTL25051-000), and the National Research Foundation of Korea (NRF) funded by MSIT (No. RS-2025-02315930).
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