Emergency plan and improvement measures of isolated grid operation for Qinshan nuclear power plant

This paper introduces the principle and characteristic of isolated grid operation of the generator and power FM, and analyzes and anticipates the isolated grid operation risk faced by the Qinshan 320 MW unit when the reliability of the off-site power supply decreased during the maintenance work of Zhejiang power grid. This paper also puts forward corresponding emergency plans of accident mitigation for the operating personnel, and provides reference for the unit when faces treatment in such a similar situation. For the shortage of the DEH-III A control system of Qinshan nuclear power plant, and the lack of experience of isolated grid operation, technical improvements are proposed combining with the industrial experience for the control system of unit. (author)