ENS 50540: Difference between revisions

v t e ENS Event
21:00 Oct 15, 2014
Title	Appendix R Unanalyzed Condition Affecting the Turbine Driven Aux Feedwater Pump
Event Description	WBN U1 [Watts Bar Nuclear Unit-1] Appendix R (APP R) procedures do not include all the required operator manual actions to ensure manual control of the Unit 1 Turbine Driven Auxiliary Feed (TDAFW) Pump during a fire in room 713-A1A or 737-A1A. The current APP R procedure includes actions to transfer the Unit 1 TDAFW Pump to local control, but does not account for the potential loss of 125 VDC or 120 VAC to the Unit 1 TDAFW pump controls. Without procedural guidance to transfer the 120 VAC and 125 VDC supplies, the operation of the Unit 1 TDAFW pump may not be completed within the required time. Failure to take all the required actions to control the Unit 1 TDAFW Pump places WBN Unit 1 in an unanalyzed condition. WBN has instituted a fire impairment for the affected rooms and established an hourly roving fire watch. The NRC Resident Inspector has been notified of this condition. The affected components are the trip throttle valve and the local control panel. Procedures should be in place by 10/16/2014 to rectify this situation.

ENS 50540 +/-
Where
Watts Bar Tennessee (NRC Region 2)
Reporting

10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition
Time - Person (Reporting Time:+1.38 h0.0575 days <br />0.00821 weeks <br />0.00189 months <br />)
Opened:	Damon Fegley 22:23 Oct 15, 2014
NRC Officer:	Mark Abramovitz
Last Updated:	Oct 15, 2014
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v • d • e

v t e Emergency Notification System
Watts Bar with 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition
WEEKMONTHYEAR2023-05-25T17:45:00 [Table view]
[ENS list for Watts Bar]

@@ Line 16: / Line 16: @@
 | event date = 10/15/2014 17:00 EDT
 | last update date = 10/15/2014
-| title = Appendix R Unanalyzed Condition Affecting The Turbine Driven Aux Feedwater Pump
+| title = Appendix R Unanalyzed Condition Affecting the Turbine Driven Aux Feedwater Pump
 | event text = WBN U1 [Watts Bar Nuclear Unit-1] Appendix R (APP R) procedures do not include all the required operator manual actions to ensure manual control of the Unit 1 Turbine Driven Auxiliary Feed (TDAFW) Pump during a fire in room 713-A1A or 737-A1A. The current APP R procedure includes actions to transfer the Unit 1 TDAFW Pump to local control, but does not account for the potential loss of 125 VDC or 120 VAC to the Unit 1 TDAFW pump controls.
 Without procedural guidance to transfer the 120 VAC and 125 VDC supplies, the operation of the Unit 1 TDAFW pump may not be completed within the required time. Failure to take all the required actions to control the Unit 1 TDAFW Pump places WBN Unit 1 in an unanalyzed condition.

Latest revision as of 20:49, 1 March 2018