ENS 43687: Difference between revisions

v t e ENS Event
19:10 Oct 3, 2007
Title	Reactor Trip on Loss of Forced Flow to Rcs Loop "a
Event Description	An emergency has not been declared and there has not been a release of radioactivity to the environment. Farley Unit 2 tripped from 100% power due to a loss of forced flow in the 'A' Reactor Coolant System loop. The loss of flow resulted from de-energization of the 2A 4160V Reactor Coolant Pump Bus that provides power to the 2A Reactor Coolant Pump following the de-energization of the 2B Start Up Transformer. The loss of the 2B Start Up Transformer appears to have been the result of relay testing on Farley Unit 1. Farley Unit 1 is currently in Mode 6 for a refueling outage. The loss of the 2B Start Up Transformer also de-energized the 2G 4160V Engineered Safeguards Feature Bus. This bus has been re-energized from the 2B Emergency Diesel Generator. All rods fully inserted and all systems functioned as required following the trip. Decay heat removal is being provided by both Motor Driven Auxiliary Feedwater Pumps supplying flow to all three Steam Generators. Cause of event is under investigation. The licensee notified the NRC Resident Inspector.

ENS 43687 +/-
Where
Farley Alabama (NRC Region 2)
Reporting

10 CFR 50.72(b)(2)(iv)(B), RPS Actuation 10 CFR 50.72(b)(3)(iv)(A), System Actuation
LER:	05000529/LER-2007-003
Time - Person (Reporting Time:+-2.43 h-0.101 days <br />-0.0145 weeks <br />-0.00333 months <br />)
Opened:	Doug Hobson 16:44 Oct 3, 2007
NRC Officer:	John Knoke
Last Updated:	Oct 3, 2007
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v • d • e

v t e Emergency Notification System
Farley with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
WEEKMONTHYEAR2024-02-16T11:34:00 [Table view]
[ENS list for Farley]

@@ Line 16: / Line 16: @@
 | event date = 10/03/2007 14:10 CDT
 | last update date = 10/03/2007
-| title = Reactor Trip On Loss Of Forced Flow To Rcs Loop "A
+| title = Reactor Trip on Loss of Forced Flow to Rcs Loop "a
 | event text = An emergency has not been declared and there has not been a release of radioactivity to the environment.
 Farley Unit 2 tripped from 100% power due to a loss of forced flow in the 'A' Reactor Coolant System loop.  The loss of flow resulted from de-energization of the 2A 4160V Reactor Coolant Pump Bus that provides power to the 2A Reactor Coolant Pump following the de-energization of the 2B Start Up Transformer. The loss of the 2B Start Up Transformer appears to have been the result of relay testing on Farley Unit 1. Farley Unit 1 is currently in Mode 6 for a refueling outage.

Latest revision as of 22:15, 1 March 2018