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Measurement and analysis of EMI at main control room in Uljin nuclear power plant

In this paper, conducted and radiated noise at the power and enclosure ports of the plant control system and the core protection calculator installed at main control room in Uljin nuclear power plant were measured and analyzed. The measurement was performed continuously over a period of two months in which the power output was elevated progressively in phases from reactor power of 0% to 100%. The measurement consisted of performing conducted emissions in the frequency range of 30 Hz to 30 MHz, and radiated emissions in the frequency range of 30 Hz to 7 GHz. The measured values and profiles for conducted and radiated emissions were similar to those of nuclear plants gathered in United States. The conducted and radiated limits, which are applicable to Korean standard, using the recursive least square analysis technique were derived from measured data. The limits obtained were compared with those of United States Nuclear Regulatory Commission (USNRC) and Electric Power Research Institute (EPRI).