Corrosion of the Secondary Side Steam Generator in the Presence of Impurities pp. 197-226
Authors: (Dumitra Lucan, Department of Corrosion and Circuits Chemistry, Institute for Nuclear Research, Pitesti, Romania)
Abstract: Steam generators are crucial components of pressurized water reactors. The failure of the steam generator as a result of components degradation by corrosion has been a major cause of Pressurized Water Reactor (PWR) plant unavailability. Steam generator problems have caused major economic losses in terms of lost electricity production through forced unit out ages and, in cases of extreme damage, as additional direct cost for large-scale repair or replacement of steam generators. Steam generator tubes and tubesheet are susceptible to failure by a variety of mechanisms, the must majority of which are related a corrosion. The feedwater that enters the steam generators under normal operating conditions is extremely pure, but nevertheless contains low levels (generally in the μg/l concentration range) of impurities such as iron, chloride, sulphate, silicate, etc. When water is converted to steam and exits the steam generator, the non-volatile impurities are left behind.