05000368/LER-1979-088-03, /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

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/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 Entergy icon.png
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:
References
LER-79-088-03L, LER-79-88-3L, NUDOCS 7912310384
Download: ML19256G492 (1)
v • d • e


LER-1979-088, /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
Event date:
Report date:
3681979088R03 - NRC Website
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text

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NRC FORM 366 U. S. NUCLE AR REGUL ATORY COMMISSION LICENSEE EVENT REPORT EXHtBIT A CONTROL BLOCK: l l l l \\ l ;h (PLE ASE PRINT CR TYPE ALL REQUIRED INFORMATION)

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75 NFPoHT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEOJENCES O'o irrT1 l During Mode 3 operation, with the electric driven Emergency Feedwater i

1 pump, 2P7B, in service as an auxiliary feedwater pump for normal startup i o

2 I Steam Generator feed, EFW flow control valve, 2CV-1025-1, failed to close e

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

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.a 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 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

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