Abstract: Undated exposure is one of the main performance indicators of radiation protection in nuclear power plants. Nuclear power plants have strict management and technical measures to prevent people from being exposed to unpned planned exposure. Based on some practical experience in operating nuclear power plants, this paper introduces the method of unconventional exposure control, and studies and discusses two typical unconventional irradiation control methods of high radiation risk operations, and concludes that unconventional exposure can be effectively avoided by formulating scientific and reasonable technical and management measures. Finally, the existing problems in the practice of un undated irradiation control are discussed and the solution is given, which provides a reference for the unseeded exposure of the control personnel of the peer power station and the radioactive-related units
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