ML11346A531
| ML11346A531 | |
| Person / Time | |
|---|---|
| Site: | Indian Point  |
| Issue date: | 12/12/2011 |
| From: | - No Known Affiliation |
| To: | Atomic Safety and Licensing Board Panel |
| SECY RAS | |
| References | |
| RAS 21523, 50-247-LR, 50-286-LR, ASLBP 07-858-03-LR-BD01 | |
| Download: ML11346A531 (1) | |
Text
NRC: Event Notification Report for November 15, 2010 http://www.nrc.gov /reading-rm' doc-collections/ event-status/eventl20 10/...
10fl Power Reactor Facility: WATTS BAR Region: 2 State: TN Unit: [1] [ ] [ ]
RX Type: [1] W-4-LP,[2] W-4-LP NRC Notified By: SHAWN HAFEN HQ OPS Officer: HOWIE CROUCH Emergency Class: NON EMERGENCY 10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION Event Number: 46418 Notification Date: 11/14/2010 Notification Time: 09:05 [ET]
Event Date: 11/14/2010 Event Time: 06:52 [EST]
Last Update Date: 11/14/2010 Person (Organization):
ALAN BLAMEY (R2DO)
UnitSCRAM CodeRX CRITInitial PWR Initial RX Mode Current PWRCurrent RX Mode 1
M/R Y
100Power Operation 0
Hot Standby Event Text MANUAL REACTOR TRIP DUE TO LOSS OF COOLING TO THE 'A' PHASE MAIN BANK TRANSFORMER "At 0617 [hrs. EST], Watts Bar experienced a failure of the cooling system to the 'A' phase Main Bank Transformer.
Due to rising oil temperatures on the 'A' phase Main Bank Transformer, the reactor was manually tripped at 0652 hrs.
All systems responded as designed with no issues."
All rods inserted during the trip. There were no primary or secondary relief valves that lifted during the transient. The grid is stable and the plant is in a normal shutdown electrical line-up. The reactor is at normal pressure and temperature with decay heat being removed via the steam dumps to condenser with auxiliary feedwater providing steam generator make-up. The cause of the loss of cooling to the 'A' phase Main Bank Transformer was the failure of a control power transformer that supplies the Main Bank Transformer cooling system components.
The licensee has notified the NRC Resident Inspector.
5/31/2011 11:22 AM OAGI0001049_00001 NYS000030 Submitted: December 12, 2011