Abstract: The water chemistry monitoring and control during the reactor shutdown process with fuel cladding failure is very important for nuclear safety, source term and personnel dose reduction, and the economic benefit improvement for refueling outages. This paper describes water chemistry monitoring and control method during the reactor shutdown process. By analyzing the practice effect of the water chemistry control during the first reactorshutdown process with fuel cladding failure in Ningde NPP, and investigating the abnormal conditions encountered, we proposed a solution.

Key words: Fuel cladding failure, Reactor shutdown, Key nuclides chemistry control