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Event Notification Report for January 14, 2015

U.S. Nuclear Regulatory Commission Operations Center Event Reports For 01/13/2015 - 01/14/2015 ** EVENT NUMBERS ** 50733 Power Reactor Event Number: 50733 Facility: DRESDEN Region: 3 State: IL Unit: [ ] [2] [ ] RX Type: [1] GE-1,[2] GE-3,[3] GE-3 NRC Notified By: DOUG STANKO HQ OPS Officer: STEVE SANDIN Notification Date: 01/13/2015 Notification Time: 22:10 [ET] Event Date: 01/13/2015 Event Time: 19:04 [CST] Last Update Date: 01/13/2015 Emergency Class: NON EMERGENCY 10 CFR Section: 50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL Person (Organization): HIRONORI PETERSON (R3DO) Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode 2 M/R Y 100 Power Operation 0 Hot Shutdown Event Text UNIT 2 MANUAL REACTOR SCRAM DUE TO REACTOR WATER LEVEL TRANSIENT "At 1904 Central Time 13 Jan 2015, Dresden Unit 2 was manually scrammed by Operators due to a Reactor Water Level transient. "All rods inserted to their full-in positions. "All systems operated as expected. "Reactor vessel inventory and pressure are being maintained in normal control bands. "The source of the transient was a failure of both controllers in the Feedwater Level Control system. Cause of the failure is under investigation. "This condition is being reported pursuant to 10 CFR 50.72(b)(2)(iv)(B), any event or condition that results in actuation of the reactor protection system (R) when the reactor is critical." There was no on-going work or testing during this time which could be attributed to the failure of the level controllers. Unit 2 is in a normal post scram electrical line-up and maintaining pressure and temperature. RHR cooling is available if required. Unit 3 was unaffected by this transient. The licensee informed the NRC Resident Inspector.

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