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… to 10 CFR 50.54 (Generic Letter 91-13) … UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON D. C. 20555 … 1. Braidwood Units 1 and 2 2. Byron Units 1 and 2 3. Catawba Units 1 and 2 4. Comanche Peak Units 1 and 2 5. Cook … the earlier development and promulgation of 10 CFR 50.63 (station blackout rule), which was based on an assumption …

… for Diesel Generator Jacket Cooling Water … UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF NUCLEAR REACTOR … valve for the diesel generator jacket cooling water at Catawba Nuclear Station occurred beyond its normal service life and to …