ENS 46418: Difference between revisions

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| event date = 11/14/2010 06:52 EST
| event date = 11/14/2010 06:52 EST
| last update date = 11/14/2010
| last update date = 11/14/2010
| title = Manual Reactor Trip Due To Loss Of Cooling To The 'A' Phase Main Bank Transformer
| title = Manual Reactor Trip Due to Loss of Cooling to the 'A' Phase Main Bank Transformer
| event text = 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.
| event text = 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.
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.

Latest revision as of 22:08, 1 March 2018

ENS 46418 +/-
Where
Watts Bar Tennessee Valley Authority icon.png
Tennessee (NRC Region 2)
Reporting
10 CFR 50.72(b)(2)(iv)(B), RPS Actuation
10 CFR 50.72(b)(3)(iv)(A), System Actuation
Time - Person (Reporting Time:+-2.78 h-0.116 days <br />-0.0165 weeks <br />-0.00381 months <br />)
Opened: Shawn Hafen
09:05 Nov 14, 2010
NRC Officer: Howie Crouch
Last Updated: Nov 14, 2010
46418 - NRC Website
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