Abstract: For the water quality management at Ningde NPP Unit 1, a variety of measures were taken at different stages of construction, involving equipment maintenance to reduce corrosion of thermal container during the installing stage of system, strict control over rinse and drain during debugging and startup stage, and check and removal of contamination sources in an one-by-one way. Thus, secondary loop water quality is continuously improved. Chemistry performance index (CPI) had reached advanced level of WANO in the first year of commercial operation.

Key words: Chemistry performance index (CPI), The first year of commercial operation, Water quality management, Management practice