Discussion on potential surface contamination risk management of a nuclear power plant

A nuclear power plant adopts the international advanced 'EVEREST' access controlled area mode, which allows personnel enter and leave the radiation controlled area in ordinary labor protection clothing. In order to avoid or reduce contamination spread and human contamination caused by accidental leakage of equipment in the radiation controlled area, the potential contamination risk management method were adopt in the controlled area of the nuclear power plant, which includes analyzing the reliability of the radioactive media inclusion of the main equipment in the nuclear loops and the causes of the contamination events that have occurred, identifying the potential contamination area, dividing the controlled area and setting boundaries for potential contamination area and the actual contamination area, and providing the personal protection accordingly. (authors)