Initial NRC Briefing by SCE on RSG Project, June 7, 2006

From the Inspector General Report on SONGS

On June 7, 2006, SCE notified NRC of its intent and timeline to replace Units 2 and 3 steam generators under 10 CFR 50.59. The SCE briefing document indicated there would be no associated power uprate and that associated technical specification changes were scheduled to be identified in 2007. The briefing document identified the following key design improvements: larger surface area, alloy 690 thermally treated tubing, improved anti-vibration bar design, integral steam nozzle, improved material for tube supports, and a forged shell. The briefing document also identified that while both the original and replacement steam generators were identical in height and upper diameter (65'6" and 22', respectively), the replacement steam generator would weigh 643.6 tons, which was 23.6 tons heavier than the original and the replacement would have more tubes than the original (9,727 versus 9,350).

SCE documented its 10 CFR 50.59 screen and evaluation for the Unit 2 and 3 steam generator replacement in engineering change packages NECP 800071702 and NECP 800071703, respectively. SCE concluded that the steam generator activities could be implemented per plant procedures without obtaining a license amendment.{{Inspector's General Report page 7.}}

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