05000368/LER-1979-051-03, /03L-0 on 790706:emergency Feedwater Flow Control Valves from Electric Driven Pump to Steam Generator a Failed to Close from Control Room Demand Signal.Cause Not Stated.Valve Tested & Motor Replace

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/03L-0 on 790706:emergency Feedwater Flow Control Valves from Electric Driven Pump to Steam Generator a Failed to Close from Control Room Demand Signal.Cause Not Stated.Valve Tested & Motor Replace
ML19274F820
Person / Time
Site: Arkansas Nuclear Entergy icon.png
Issue date: 07/31/1979
From: Shively C
ARKANSAS POWER & LIGHT CO.
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19274F812 List:
References
LER-79-051-03L, LER-79-51-3L, NUDOCS 7908060482
Download: ML19274F820 (1)
v • d • e


LER-1979-051, /03L-0 on 790706:emergency Feedwater Flow Control Valves from Electric Driven Pump to Steam Generator a Failed to Close from Control Room Demand Signal.Cause Not Stated.Valve Tested & Motor Replace
Event date:
Report date:
3681979051R03 - NRC Website
v • d • e

text

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NRC f ORM 34.

V 5 NUCLE AR REGUL ATORY COMM11SION (7 77)

LICENSEE EVENT REPORT EXHIBIT A CONTROL SL OCir {l l l l l j (PLE ASE PRINT OR T YPE ALL REQUtRE D INFORMATIONI l Al R l A l Nl 0 l 2 lgl 0 0 l - l0 l 0 l 0l 0l 0 l-l 0 i0 Jg4 l1 l 1 l1 l 1 lgl l lg o i S 9 t# CON $tt LoGt la 1g Lic g N3t syv, t #,

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,0 EVENT OESCRIPTION AND PROH AOLE CONSEQUENCES h

! During Mode 3 operation, it was identified that Emergency Feedwater i

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g i flow control valves from the electric driven EFW pump, 2P7B, to the "A" l

[o 1 1 l steam generator, 2CV-1025 and 2CV-1038, failed to close from a i

FTT9 I control room demand' signal. The open position is required for EFAS; theqcfore, lo Ic I I the EFN flowpath would be unaffected in an emernency situation. The remainder lo lil I of the EFW valves were successfully tested from the control room.

Occurzence As

,L.similar_.to.J0-368/19-04L 79-035 78-0_28_1_0 78-009.

Reportable per T.S.Q.9.1.9b 1-

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4Q 41 44 4J se qg ci.ust oESCnericN Aso CCRRECflVE ACTIONS h l i i a l i The ability to stroke 2CV-1038 returned with no corrective action.

I i Valve was tested and declared operable.

Valve 2CV-1025 required the i i i

Li_lsJl venlacenent of SCR's in the closinc stroke control circuitrv.

The motori t i l 31 I was also replaced due to failure because of the inoperable SCR's.

The i

m I valves were declared operable within 14 hours1.62037e-4 days <br />0.00389 hours <br />2.314815e-5 weeks <br />5.327e-6 months <br /> meeting the requirement ofi

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