ML19274F820

LER 79-051/03L-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

ML19274F820
Person / Time
Site:	Arkansas Nuclear
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: ML19274F811 ML19274F815 ML19274F817 ML19274F819 ML19274F820 ML19274F821
References
LER-79-051-03L, LER-79-51-3L, NUDOCS 7908060482
Download: ML19274F820 (1)

Text

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NRC f ORM 34. V 5 NUCLE AR REGUL ATORY COMM11SION (7 77)

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65 L,0C a t ? NUMB ( R tdl 65 (VE NT oaf ( le it bF,0s41 uaTE ,0 EVENT OESCRIPTION AND PROH AOLE CONSEQUENCES h a s  ! During Mode 3 operation, it was identified that Emergency Feedwater i 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 1-

,L.similar_.to.J0-368/19-04L 79-035 78-0_28_1_0 78-009. Reportable per T.S.Q.9.1.9b

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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 i i Valve was tested and declared operable. Valve 2CV-1025 required the 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 src.,

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*'[a,,rion ot @ NRci& colv 2 o ,nu,'[81 LN NA I IIIIIIIIIIIII ave OF PREPAREn Chris N. Shively , ,, 5di/968-2519 790806 OWL

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