ENS 49154: Difference between revisions

v t e ENS Event
17:30 Jun 28, 2013
Title	Automatic Reactor Trip Due to Offsite Electrical Fault
Event Description	On June 28, 2013 at 1330 [EDT], Watts Bar Nuclear Plant Unit 1 reactor automatically tripped due to an electrical fault causing a main generator lockout and subsequent turbine trip. The electrical fault generated an 'A' Main Bank Transformer Differential Relay actuation. Suspected cause is due to an offsite fault. This is being reported under 10CFR50.72(b)(2)(iv)(B). Concurrent with the reactor trip the Auxiliary Feedwater system actuated as designed. This is being reported under 10CFR50.72(b)(3)(iv)(A). All Control and Shutdown rods fully inserted. All safety systems responded as designed. The unit is currently stable in Mode 3, with decay heat removal via Auxiliary Feedwater, steam dumps and the main condenser. The station is in a normal shutdown electrical alignment. The NRC Senior Resident has been notified. There were no primary or secondary relief valve actuations during the plant transient. The cause of the electrical fault is being investigated.

ENS 49154 +/-
Where
Watts Bar 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:+-0.93 h-0.0388 days <br />-0.00554 weeks <br />-0.00127 months <br />)
Opened:	Michael Bottorff 16:34 Jun 28, 2013
NRC Officer:	Howie Crouch
Last Updated:	Jun 28, 2013
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v • d • e

v t e Emergency Notification System
Watts Bar with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
WEEKMONTHYEAR2024-07-08T19:21:00 [Table view]
[ENS list for Watts Bar]

@@ Line 16: / Line 16: @@
 | event date = 06/28/2013 13:30 EDT
 | last update date = 06/28/2013
-| title = Automatic Reactor Trip Due To Offsite Electrical Fault
+| title = Automatic Reactor Trip Due to Offsite Electrical Fault
 | event text = On June 28, 2013 at 1330 [EDT], Watts Bar Nuclear Plant Unit 1 reactor automatically tripped due to an electrical fault causing a main generator lockout and subsequent turbine trip.  The electrical fault generated an 'A' Main Bank Transformer Differential Relay actuation.  Suspected cause is due to an offsite fault.
 This is being reported under 10CFR50.72(b)(2)(iv)(B).

Latest revision as of 22:00, 1 March 2018