Abstract The CONOSEAL seal for the nuclear reactor thermocouple column belongs to the boundary seal of the primary circuit. When the sealing surface suffers from scratches, damages, or other defects, it will directly affect the sealing reliability and result in leakage. However, replacing the thermocouple column is a complex process with huge workload and long period. To address these issues, an in-situ reactor thermocouple column CONOSEAL sealing surface repairing device is designed.
