ML19256G492

LER 79-088/03L-0:on 791122,during Mode 3 Operation,Emergency Feedwater Flow Control Valve 2CV-1025-1 Failed to Close on Demand from Control Room.Caused by Valve Operator Hydraulic Pressure Being Low.Sys Vented

ML19256G492
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-79-088-03L, LER-79-88-3L, NUDOCS 7912310384
Download: ML19256G492 (1)

Text

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7 60 61 DOcnET muwata 68 69 i. 75 NFPoHT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEOJENCES O'o irrT1 l During Mode 3 operation, with the electric driven Emergency Feedwater i o 2 1 pump, 2P7B, in service as an auxiliary feedwater pump for normal startup i e . I Steam Generator feed, EFW flow control valve, 2CV-1025-1, failed to close ic i s i I on demand from the Control Room. The valve failed in the EFW. or safe.

Ic is i l cosition. All redundant rFW valvos worp sucrossfully stroked frnm tha I lolilI Control Room. This occurrence is similar to LER 50-368/79-043. Other I o e i occurrences involvino valve 2CV-1025-1 are 50-368/79-068.79-054. 79-051.1"

> a9 79-035, CCOE @28 aq[J8-00L, Reportable per T.S. 6.94,,9.b ,, .

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CAUSE CESCA.*TICN AND COR AEC TIVE ACTIONS i o i Investication revealed that the valve operator's hydraulic pressure was I i i low. The hydraulic s_ystem was vented, the reservoir was returned to i r r71 I normal level, and the hydraulic pressure was adjusted. The valve was i 3 I successfully stroke tested and declared operable within 29 hours3.356481e-4 days <br />0.00806 hours <br />4.794974e-5 weeks <br />1.10345e-5 months <br />, meetingi i a 1 the rcouircr.ent nf Action ('a+omont T.S. 1.7.1.2. I

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NAVE Os eReeAnEn Chris N. Shively ,,,g, ,

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