Comanche Peak Unusual Event on Dec 4 2013- Contractor Cut Power CableSomervell County Salon-Glen Rose, Rainbow, Nemo, Glass....Texas


 

Comanche Peak Unusual Event on Dec 4 2013- Contractor Cut Power Cable
 


8 December 2013 at 12:11:56 PM
salon

from NRC.GOV

Power Reactor Event Number: 49606
Facility: COMANCHE PEAK
Region: 4 State: TX
Unit: [1] [2] [ ]
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: MATT KARL
HQ OPS Officer: DANIEL MILLS
Notification Date: 12/04/2013
Notification Time: 15:14 [ET]
Event Date: 12/04/2013
Event Time: 13:50 [CST]
Last Update Date: 12/05/2013
Emergency Class: UNUSUAL EVENT
10 CFR Section:
50.72(a) (1) (i) - EMERGENCY DECLARED
50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Person (Organization):
MICHAEL VASQUEZ (R4DO)
WILLIAM GOTT (IRD)
JENNIFER UHLE (NRR)
MARK DAPAS (R4RA)
MARK KING (NRR)

 

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 N Y 100 Power Operation 100 Power Operation
2 N Y 100 Power Operation 100 Power Operation

Event Text

UNUSUAL EVENT - LOSS OF STARTUP POWER DUE TO A CUT CABLE

"At 1343 CST on 12/04/2013, Comanche Peak Nuclear Power Plant experienced a loss of safeguards electrical power when 345KV transformer XST2 lost power from offsite while 138KV transformer XST1 was out of service for maintenance. Non-Safeguards electrical power remained energized. Both Units remain at power in Mode 1. Both units Emergency Diesel Generators automatically started and all safeguards busses were re-energized from the Emergency Diesel Generators. All ESF systems functioned as expected and the Turbine Driven Auxiliary Feedwater Pump automatically started as designed. Operators reduced reactor power to maintain reactor power less than 100 percent rated thermal power."

At 1350 CST, the licensee declared an Unusual Event due to losing both startup transformers. The cause of the loss of the second start up transformer was a cut cable. No one was injured during this event.

The licensee informed State and Local Government Agencies and the NRC Resident Inspector.

Notified other Federal Agencies (DHS SWO, FEMA Ops, DHS NICC, and Nuclear SSA via email).

* * * UPDATE AT 1718 EST ON 12/4/2013 FROM MATT KARL TO STEPHEN SANDIN * * *

Correction to initial event report description; actual loss of electrical power time was 1341 CST.

Include 8-HR Non-Emergency report for Specified System Actuation for automatic start of Auxiliary Feedwater and Emergency Diesel Generators.

Notified the R4DO (Vasquez).

* * * UPDATE FROM DAVE BUTLER TO JOHN SHOEMAKER AT 1840 EST ON 12/05/13 * * *

Comanche Peak terminated from the Unusual Event at 1717 CST on 12/05/13. Offsite power has been restored to both safeguard busses on both units via the transformer XST2. Work continues on transformer XST1. Comanche Peak Units 1 and 2 continue to operate at 100% power.

The licensee has notified the NRC Resident Inspector.

Notified R4DO (Vasquez), NRR EO (Bahadur), IRD MOC (Gott), and DHS SWO, FEMA Ops, DHS NICC, and Nuclear SSA via email.

 

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