ENS 49461: Difference between revisions

v t e ENS Event
15:44 Oct 22, 2013
Title	Manual Reactor Trip Due to Decreasing Condenser Vacuum
Event Description	At 1144 EDT, Vogtle Unit Two was manually tripped in response to lowering Main Condenser vacuum. The Unit 2 Bravo Main Feed Pump was tagged out for scheduled maintenance and the casing was being removed when condenser vacuum started lower due to isolation valve not holding pressure. Main Condenser vacuum lowered to less than procedural limits for continued plant operation. All systems operated correctly in response to the reactor trip. All control rods fully inserted. AFW was placed in service to control Steam Generator levels. System response allowed for an uncomplicated reactor trip response. Plant is stable in Mode 3 while performing a cause investigation. The NRC Senior Resident Inspector was notified and at plant site. The plant is in a normal post-trip electrical line-up. Decay heat is being removed via the steam dumps to the Main Condenser.

ENS 49461 +/-
Where
Vogtle Georgia (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:+-2.43 h-0.101 days <br />-0.0145 weeks <br />-0.00333 months <br />)
Opened:	Kevin Lowe 13:18 Oct 22, 2013
NRC Officer:	Donald Norwood
Last Updated:	Oct 22, 2013
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v • d • e

v t e Emergency Notification System
Vogtle with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
WEEKMONTHYEAR2024-07-09T01:25:00 [Table view]
[ENS list for Vogtle]

@@ Line 16: / Line 16: @@
 | event date = 10/22/2013 11:44 EDT
 | last update date = 10/22/2013
-| title = Manual Reactor Trip Due To Decreasing Condenser Vacuum
+| title = Manual Reactor Trip Due to Decreasing Condenser Vacuum
 | event text = At 1144 EDT, Vogtle Unit Two was manually tripped in response to lowering Main Condenser vacuum.  The Unit 2 Bravo Main Feed Pump was tagged out for scheduled maintenance and the casing was being removed when condenser vacuum started lower due to isolation valve not holding pressure.  Main Condenser vacuum lowered to less than procedural limits for continued plant operation.
 All systems operated correctly in response to the reactor trip.  All control rods fully inserted.  AFW was placed in service to control Steam Generator levels.  System response allowed for an uncomplicated reactor trip response.  Plant is stable in Mode 3 while performing a cause investigation.

Latest revision as of 21:52, 1 March 2018