NRC Event Notification for Comanche Peak Nuclear Power Plant on AUgust 26, 2008Somervell County Salon-Glen Rose, Rainbow, Nemo, Glass....Texas


 

NRC Event Notification for Comanche Peak Nuclear Power Plant on AUgust 26, 2008
 


31 August 2008 at 8:52:50 AM
salon

Power ReactorEvent Number: 44439
Facility: COMANCHE PEAK
Region: 4 State: TX
Unit: [1] [ ] [ ]
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: GARY MERKA
HQ OPS Officer: HOWIE CROUCH
Notification Date: 08/25/2008
Notification Time: 16:27 [ET]
Event Date: 06/28/2008
Event Time: 19:04 [CDT]
Last Update Date: 08/25/2008
Emergency Class: NON EMERGENCY
10 CFR Section:
50.73(a)(1) - INVALID SPECIF SYSTEM ACTUATION
Person (Organization):
VIVIAN CAMPBELL (R4)

UnitSCRAM CodeRX CRITInitial PWRInitial RX ModeCurrent PWRCurrent RX Mode
1NY100Power Operation95Power Operation

Event Text

60-DAY OPTIONAL REPORT FOR AN INVALID ACTUATION OF UNIT 1 TDAFW PUMP

"This report describes an invalid actuation of the Unit 1 Turbine Driven Auxiliary Feedwater (TDAFW) pump that occurred on June 28, 2008. This report is being made in accordance with 10CFR50.73(a)(1), which states, in part, 'In the case of an invalid actuation reported under 10CFR50.73(a)(2)(iv), other than actuation of the Reactor Protection System (RPS) when the reactor is critical, the licensee may, at its option, provide a telephone notification to the NRC Operations Center within 60 days after discovery of the event instead of submitting a written LER.'

"On June 28, 2008, Comanche Peak Nuclear Power Plant Unit 1 was in Mode 1 operating at 100% power. At 1904 CDT, the steam supply valve from Main Steam Line 1-04 to the TDAFW pump opened due to a failed diaphragm. Turbine load was subsequently reduced from 1207MWe to 1150MWe per Operations procedures. The upstream isolation valve for the steam supply to the TDAFW pump was closed and the TDAFW pump was stopped. Unit 1 was returned to full power at 2120 CDT and the failed diaphragm was subsequently replaced.

"The specific train and system that actuated was the third AFW train on Unit 1. The train actuation was complete and during the TDAFW start the system started and functioned correctly."

The licensee has notified the NRC Resident Inspector.


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