Secondary Water Chemistry Control at St. Lucie No. 1

摘要

Plant design and operating philosophy relative to secondary cycle chemistry control at St. Lucie Nuclear Power Station Unit 1 were reviewed. St. Lucie 1 experienced moderate steam generator corrosion (tube denting) after only 17 months of commercial operation. Since the corrosion appeared related to the introduction of contaminants into the secondary cycle from intermittent condenser tube leakage, the condenser was retubed with titanium, and integrally grooved tubesheets were installed. Recently a new type of corrosive attack was found at the U-bend region of both steam generators. The precise nature and cause of this attack have not yet been determined. (ERA citation 08:012307)