ARKANSAS NUCLEAR ONE – NRC INTEGRATED INSPECTION REPORT 05000313/2014002 AND 05000368/2014002
Green. Inspectors documented a self-revealing finding for the licensee’s failure to correctly install the flexible link bolted connection on phase C of the 6.9 kV non-segregated bus of the Unit 2 auxiliary transformer, which contributed to the explosion of the Unit 2 auxiliary transformer. The licensee documented the issue in Condition Report CR-ANO-2-2013-02242. The licensee aligned startup transformer 3 (preferred offsite power source) to carry the plant loads during normal power operations and restarted the plant on January 10, 2014. The transformer is scheduled to be replaced during the upcoming refueling outage starting in May.
• Green. Inspectors documented a self-revealing finding for the licensee’s failure to correctly land the signal wire from the Unit 2 auxiliary transformer differential relay output contacts to the main generator lockout relay, which contributed to the explosion of the Unit 2 auxiliary transformer. The licensee documented the issue in Condition Report CR-ANO-2-2013-02242. The licensee correctly landed the wire and aligned startup transformer 3 (preferred offsite power source) to carry the
• Green. The inspectors reviewed a self-revealing non-cited violation of 10 CFR 50.63, “Loss of all alternating current power,” for the licensee’s failure to maintain the alternate ac diesel generator as a power source available to withstand and recover from a station blackout. Specifically, the licensee failed to perform preventive maintenance on the governors of the diesel in accordance with the recommended vendor maintenance, which resulted in an overspeed trip of the engine during testing. The licensee repaired the governors
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