Current Event Notification Report for November 19, 2013
U.S. Nuclear Regulatory CommissionOperations Center
Event Reports For
11/18/2013 - 11/19/2013
MANUAL REACTOR TRIP DUE TO INDICATION OF DROPPED CONTROL RODS
"On November 14, 2013, at 1313 Eastern Standard Time, Unit 1 was manually tripped from 100% power due to indications of [four] dropped control rods. This manual reactor protection system actuation is reportable per 10 CFR 50.72(b)(2)(iv)(B). The cause of the dropped rods is not confirmed at this time, but may be related to maintenance in a Rod Control Power Cabinet ongoing at the time of the event.
"The Operations crew entered the reactor trip procedure and stabilized Unit 1 in Mode 3 at normal operating temperature and pressure. All control rods fully inserted into the core following the reactor trip and all plant systems operated as designed.
"The Auxiliary Feedwater (AFW) system [1A and 1B motor-driven pumps] was manually started for steam generator level control following reactor trip. The start of the AFW system is reportable per 10 CFR 50.72 (b)(3)(iv)(A) for a valid system actuation.
"Decay heat is being removed via the steam generators [via steam dumps to the main condenser]. This event does not impact public health and safety.
"Unit 2 was not affected by this event.
"The licensee notified the NRC Resident Inspector."
* * * UPDATE FROM WARREN MOORE TO DANIEL MILLS ON 11/18/13 AT 0950 EST * * *
A subsequent licensee evaluation determined that there were ten dropped control rods.
Notified the R1DO (Desai).
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