Water regime and core state in WWER reactors

Some features of the ammonia-potassium water regime used in the WWER-reactors are considered. This regime makes it possible to suppress water radiolysis and simultaneously obtain a high pH value of the coolant, which is necessary in operation with boron control of the reactor power. Absence of oxygen and significant deposits on the zirconium alloy claddings of the fuel elements affect favourably the corrosion condition of the core. The thickness of the corrosion film on the fuel cladding at the end of their lifetime is as low as 3μm and the hydrogen content remains at the initial level