ML19256G496

LER 79-089/03L-0:on 791124,during Mode 3 Operation,Emergency Feedwater Flow Control Valve 2CV-1025-1 Failed to Close on Demand from Control Room.Caused by Trash in Valve Operator Hydraulic Sys & Hydraulic Snubber Out of Adjustment

ML19256G496
Person / Time
Site:	Arkansas Nuclear
Issue date:	12/21/1979
From:	Shively C ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19256G491	List: ML19256G490 ML19256G492 ML19256G496 ML19256G500 ML19256G503 ML19256G505
References
LER-79-089-03L, LER-79-89-3L, NUDOCS 7912310393
Download: ML19256G496 (1)

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NRC F ORM 366 U. S. NUCLE AR REGUL ATORY COMMIS$10N LICENSEE EVENT REPORT EXHIBIT A (PLE ASE PRINT OR TYPE ALL REOutRED INFORMATION)

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60 6, 68 69 EVENT DATE 74 75 HEPORT DATE 80 7 DOCstET N' Jut ER EVENT DESCRIPTION AND PROB ABLE CONSEOUENCES h o 2 1 Durino Mode 3 operation, with the electric driven Emercacy Feed. water i e i pump, 2P7B, in service as an auxiliary feedwater pump for normal startup i o . I Steam Generator feed. EFW flow control valve. 2CV-1026-1. failed tn clnsel e s i on demand from the Control Room. The valve failed in the EFW. or safe. I lo is i l position. All redundant EFW valves were su cessfully stroked from th9 I a i l Control Room. This occurrence is similar to LER 50-368/79-088 and 79-043L o e i Other ocqyrrences involvino 2CV-1025-1 are co-168/79-06R.74-094. 70 ns1 1

' a9 79-035, j,M028 anA.J8-0%,' Reportable per T.S. 6 4..l.9.h ,,

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I,lilI the hydraulic snubber out of adiustrnent. restricting oil flow in one i

, 2 direction. The hydraulic system was cleaned, the hydraulic snubber was i 3 adjusted, the valve stroked satisfactorily and declared operable within I iTTTl i 13 hours1.50463e-4 days <br />0.00361 hours <br />2.149471e-5 weeks <br />4.9465e-6 months <br />, meeting the recuirements of Action Statement T.S. 3.7.1.2. t STA 5 N'C^!A C?af., $Y e *US 5 v HV LisCU'. t Hy of;cH # rioN s [Ej@ l O nl I nl@l CEA Tactino l [AJ@l*o NA l

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