Occupational exposure to magnetic fields while working around a reactor at a 400 kV substation in Finland

The paper presents the investigation of occupational exposure to magnetic fields at a 400 kV substation while working around a reactor. We studied three tasks: (A) working near the fence of a reactor; (B) maintaining an operating device of a disconnector of a reactor from a service platform, and (C) walking near reactor cables. We performed 12 magnetic field measurements and 10 measurements of exposure ratios (magnetic field) adhering to ICNIRP occupational guidelines. At Task A, the average magnetic field was 195.5 µT, and the maximum magnetic field was 260.0 µT. At Task B, the magnetic field was 97.0 µT, and at Task C, the average magnetic field was 559.8 µT, with a maximum magnetic field of 710.0 µT. The highest magnetic field (710 µT at task C) was 71% of the of the low action level…