ENS 41402: Difference between revisions

v t e ENS Event
04:00 Feb 11, 2005
Title	Technical Specification Required Shutdown Due to Loss of Electrical Power Sources
Event Description	Event: At 23:00 [EST] on 2-10-05, Oconee Unit 1 initiated a plant shutdown as required by its Technical Specifications. Technical Specification 3.8.1 Condition M, Required Action M.1 requires Oconee Unit 1 to enter Mode 3 by 03:06 on 2-11-05 due to Keowee Hydro Unit 2 and CT-1 inoperable. Keowee Hydro Unit 2 is inoperable due to a planned outage, with restoration in progress. CT-1 is inoperable due to experiencing a lockout at 12:12 on 2-10-05 during testing to restore Keowee. Initial Safety Significance: Oconee Unit 1 is being shut down in accordance with Technical Specifications. Unit auxiliaries will be powered from the Standby busses and a Lee Combustion Turbine. When the turbine is tripped, the Unit will enter into the natural circulation mode of cooling due to loss of Reactor Coolant Pumps. Corrective Action(s): 1) Restoration of Keowee Hydro Unit 2 is in progress. 2) A Unit Threat Team has been assembled and is investigating the cause of the lockout on CT-1. CT-2 cross connect is in progress to allow the unit, if tripped, to avoid loss of Reactor Coolant Pumps. The licensee notified the NRC Resident Inspector. * * * UPDATE FROM D. NIX TO M. RIPLEY 0016 EST 02/11/05 * * * * At the time of the initial notification, Oconee reported that, at 2346 EST on 02/10/05, the CT-2 cross connect has been completed, allowing the unit, if tripped, to avoid a loss of Reactor Coolant Pumps. The power reduction to enter Mode 3 by 03:06 continues. Restoration of Keowee Hydro Unit 2 and investigation into the cause of the lockout on CT-1 remain in progress. The licensee notified the NRC Resident Inspector. Notified R2 DO (M. Widman), IRD (Crlenjak), and NRR EO (W. Beckner). * * * UPDATE FROM J. COLLINS TO W. HUFFMAN 0045 EST 02/11/05 * * * * At 0033 EST 02/11/05, restoration of Keowee Hydro Unit 2 to operable status was completed and Technical Specification 3.8.1 Condition M, Required Action M.1 requiring Oconee Unit 1 to enter Mode 3 by 03:06 on 2-11-05 was exited. The power reduction was stopped with power at 85% at 0034 EST. Technical Specification 3.8.1, Condition A, which was entered on 1106 EST on 02/10/05, requires restoration of CT-1 by 2306 on 02/11/06. The licensee notified the NRC Resident Inspector. Notified R2 DO (M. Widman), IRD (Crlenjak), and NRR EO (W. Beckner).

ENS 41402 +/-
Where
Oconee South Carolina (NRC Region 2)
Reporting

10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown
Time - Person (Reporting Time:+-3.73 h-0.155 days <br />-0.0222 weeks <br />-0.00511 months <br />)
Opened:	David Nix 00:16 Feb 11, 2005
NRC Officer:	Mike Ripley
Last Updated:	Feb 11, 2005
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v • d • e

v t e Emergency Notification System
Oconee with 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown
WEEKMONTHYEAR2013-11-11T10:20:00 [Table view]
[ENS list for Oconee]

@@ Line 16: / Line 16: @@
 | event date = 02/10/2005 23:00 EST
 | last update date = 02/11/2005
-| title = Technical Specification Required Shutdown Due To Loss Of Electrical Power Sources
+| title = Technical Specification Required Shutdown Due to Loss of Electrical Power Sources
 | event text = Event:  At 23:00 [EST] on 2-10-05, Oconee Unit 1 initiated a plant shutdown as required by its Technical Specifications.  Technical Specification 3.8.1 Condition M, Required Action M.1 requires Oconee Unit 1 to enter Mode 3 by 03:06 on 2-11-05 due to Keowee Hydro Unit 2 and CT-1 inoperable.  Keowee Hydro Unit 2 is inoperable due to a planned outage, with restoration in progress.  CT-1 is inoperable due to experiencing a lockout at 12:12 on 2-10-05 during testing to restore Keowee.
 Initial Safety Significance: Oconee Unit 1 is being shut down in accordance with Technical Specifications.  Unit auxiliaries will be powered from the Standby busses and a Lee Combustion Turbine.  When the turbine is tripped, the Unit will enter into the natural circulation mode of cooling due to loss of Reactor Coolant Pumps.

v t e Unit 1
B&W-L-LP
Reactor critical	Critical
Scram	No
Before	Power Operation (100 %)
After	Power Operation (90 %)

ENS 41402: Difference between revisions

Latest revision as of 21:21, 1 March 2018

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ENS 41402: Difference between revisions

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