The invention provides a nuclear emergency 
system of a 
nuclear power plant, and belongs to the technical field of 
nuclear power plant emergency planning and preparing. The 
system comprises portable individual emergency devices, a fixed 
nuclear radiation monitoring device, an emergency refuge and a control center. The portable individual emergency device and the fixed 
nuclear radiation monitoring device can position and measure current 
radiation data and send the data to the control center. The control center judges whether leakage happens or not, confirms the accident location and 
radiation range, and plans the retreating and emergency refuge 
route according to positions of all workers through summarization and analysis, and sends the information to the corresponding portable individual emergency devices to be displayed on a map through display modules, and safe retreating of the workers is ensured. The 
system is simple in structure, complete in function, rapid, efficient and high in 
safety coefficient, greatly improves nuclear emergency reaction capacity and increases the 
survival rate of the workers on site, and meanwhile can be used as a nuclear emergency 
command system of the 
nuclear power plant.