PWR Steam Generator Chemical Cleaning Phase I Solvent and Process Development Volume II

摘要

Consolidated Edison Company of New York organized and manages a program for the Department of Energy to develop and demonstrate chemical cleaning methods for removing magnetite corrosion products from the annuli between steam generator tubes and the tube support plates in vertical U-tube steam generators. These corrosion products have caused steam generator tube "denting" and in some cases have caused tube failures and support plate cracking in several PWR generating plants.nIn August, 1977, under subcontract to Consolidated Edison, United Nuclear Industries initiated laboratory studies to develop a chemical cleaning solvent and application process for demonstration cleaning of the Indian Point Unit 2 steam generators. During December 1977, the chemical cleaning solvent and application process were successfully pilot-tested by cleaning the secondary side of one of the Indian Point Unit 1 steam generators. Although the Indian Point Unit 1 steam generators do not have a tube denting problem, the pilot test provided for testing of the solvent and process using much of the same equipment and facilities that would be used for the Indian Point Unit 2 demonstration cleaning.