ENS 50140: Difference between revisions

v t e ENS Event
09:36 May 25, 2014
Title	Automatic Reactor Trip Due to Turbine Trip on Loss of Condenser Vacuum
Event Description	This is an non-emergency event notification to the NRC Operations Center in accordance with 10 CFR 50.72(b)(2)(iv)(B) for a valid actuation of the reactor protection system (RPS) (four hour notification). On 05/25/2014 at 0536 EDT, as part of a planned maintenance outage to repair a leaking check valve inside the containment building, Unit 4 power level had been lowered to 19% reactor power for the planned opening of the reactor trip breakers. Unit 4 experienced a loss of condenser vacuum. An automatic turbine trip signal was generated which initiated a reactor trip signal. The reactor tripped as required on the automatic trip signal. Unit 4 is currently in Mode 3 and stable. The loss of vacuum is under investigation at this time. All other plant systems are working as designed. The reactor trip was uncomplicated with no other safety system actuations. Decay heat is being removed via steam dumps to atmosphere. There is no known primary to secondary leakage. The grid is stable and Unit 4 is in its normal shutdown electrical lineup. Unit 3 was not affected and continues to operate at 100% power. The licensee has notified the NRC Resident Inspector.

ENS 50140 +/-
Where
Turkey Point Florida (NRC Region 2)
Reporting

10 CFR 50.72(b)(2)(iv)(B), RPS Actuation
LER:	05000251/LER-2014-002
Time - Person (Reporting Time:+-1.98 h-0.0825 days <br />-0.0118 weeks <br />-0.00271 months <br />)
Opened:	Jay Van Hulzen 07:37 May 25, 2014
NRC Officer:	Howie Crouch
Last Updated:	May 25, 2014
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v • d • e

v t e Emergency Notification System
Turkey Point with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation
WEEKMONTHYEAR2023-09-22T22:19:00 [Table view]
[ENS list for Turkey Point]

@@ Line 16: / Line 16: @@
 | event date = 05/25/2014 05:36 EDT
 | last update date = 05/25/2014
-| title = Automatic Reactor Trip Due To Turbine Trip On Loss Of Condenser Vacuum
+| title = Automatic Reactor Trip Due to Turbine Trip on Loss of Condenser Vacuum
 | event text = This is an non-emergency event notification to the NRC Operations Center in accordance with 10 CFR 50.72(b)(2)(iv)(B) for a valid actuation of the reactor protection system (RPS) (four hour notification).
 On 05/25/2014 at 0536 EDT, as part of a planned maintenance outage to repair a leaking check valve inside the containment building, Unit 4 power level had been lowered to 19% reactor power for the planned opening of the reactor trip breakers. Unit 4 experienced a loss of condenser vacuum. An automatic turbine trip signal was generated which initiated a reactor trip signal. The reactor tripped as required on the automatic trip signal. Unit 4 is currently in Mode 3 and stable. The loss of vacuum is under investigation at this time. All other plant systems are working as designed.

Latest revision as of 21:50, 1 March 2018