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… 130, & Essential Service Water System Failures at Multi-Unit Sites, & Pursuant to 10 CFR 50.54 (Generic Letter … REACTOR NUCLEAR POWER PLANTS: 1. Braidwood Units 1 and 2 2. Byron Units 1 and 2 3. Catawba Units 1 and 2 4. Comanche … the earlier development and promulgation of 10 CFR 50.63 (station blackout rule), which was based on an assumption …

… the Power Supply Circuitry of Electric Governor Systems … UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF … notified the NRC that during a refueling outage, the Byron Station Unit 1 A EDG had failed a scheduled 4-hour …