05000336/LER-1978-034-03, /03L-0 on 781227:during Surveillance,Svc Water Isolation Valve 2-SW-3.2A Failed to Close.Caused by Actuating Air Flow Being Blocked

/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: 05000336/LER-1978-034, Forwards LER 78-034/03L-0 05000336/LER-1978-034-03, /03L-0 on 781227:during Surveillance,Svc Water Isolation Valve 2-SW-3.2A Failed to Close.Caused by Actuating Air Flow Being Blocked
References
LER-78-034-03L, LER-78-34-3L, NUDOCS 7902050199
Download: ML19269C519 (1)

LER-1978-034, /03L-0 on 781227:during Surveillance,Svc Water Isolation Valve 2-SW-3.2A Failed to Close.Caused by Actuating Air Flow Being Blocked

Event date:
Report date:
3361978034R03 - NRC Website

text

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LICENSEE EVENT REPORT CONT nOL DLOCK: l l

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CON'T 63 G57 EVEPJT DAT E 74 75 REPOR1 DATE 80 LO 61 DOCK LT NUPMU ER 7

8 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 loads in the event of a safety injection actuation signal (SIAS).

The_ actuating I

[o ;,, ; L air solenoid valve was replaced, the pr.eumati; tubing was cleaned, associated I

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items lubricated and the valve restored to service.

The isolation valve for the I

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redundant service water header was operable.

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'CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i

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The apparent cause of failure was the valve not functioning due to actuating air i

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. flow being blocked.

The solenoid valve is ASCO Model 834481 125 VDC.

The redundanJJ header solenoid actuator will be inspected during the refueling outage scheduled j

i,,,i j in March, 1979.

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