ML19269C519

LER 78-034/03L-0 on 781227:during Surveillance,Svc Water Isolation Valve 2-SW-3.2A Failed to Close.Caused by Actuating Air Flow Being Blocked

ML19269C519
Person / Time
Site:	Millstone
Issue date:	01/25/1979
From:	Mccann W NORTHEAST UTILITIES
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19269C518	List: ML19269C517 ML19269C519
References
LER-78-034-03L, LER-78-34-3L, NUDOCS 7902050199
Download: ML19269C519 (1)

Text

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LICENSEE EVENT REPORT (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATioN)

CONT nOL DLOCK: l 1

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EVENT DESCRIPTION AND PROBABLE CONSLOVENCES h

[o l2l l While performing surveillance, service water isolation valve 2-SU-19A failprf I to close. This valve isolates non vital turbine buildina c.losed cooling water I ql

[o ;,, ; L loads in the event of a safety injection actuation signal (SIAS). The_ actuating I o 3 ; air solenoid valve was replaced, the pr.eumati; tubing was cleaned, associated I g o i c, , [ items lubricated and the valve restored to service. The isolation valve for the I joj, l redundant service water header was operable. l o s I

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'CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i O l The apparent cause of failure was the valve not functioning due to actuating air i i, i3i ; . flow being blocked. The solenoid valve is ASCO Model 834481 125 VDC. The redundanJJ i, ,,i j header solenoid actuator will be inspected during the refueling outage scheduled j

, , , ., , i in March, 1979. I l

i 4 I 80 7 8 9 s7 s  % POWER OTHERSTATUS bisco RY DISCOVERY DESCRIPTION Ii 15 I L _J@ 11 1010 l@l NA I LE.j@l Surveillance Test I AL TIVIT Y CO TENT AELEASED Of RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE NA l l NA I li Ic I8 LzJ 7 9

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