Abstract: The radiation monitoring system of a NPP is use for its main processes, effluents and workplaces, to ensure its safe operation and protection of worker and public health. The development of computerhas created a condition for realizing digitization of radiation monitoring system in NPPs. The overall structure of this system has changed dramatically, evidenced from the development of Ling'Ao nuclear power Phase I, II and Ningde NPP. The technical problems encountered in the optimization of nuclear power plant radiation monitoring system and the improvement scheme is analyzed and discussed.

Key words: NPP, Radiation monitoring system, Optimization and improvement