05000271/LER-1981-021-03, /03L-0:on 810730,containment Isolation Valve V20-94 Failed to Close During Surveillance Testing.Possibly Caused by Normal Wear W/Accumulation of Minor Amounts of Dirt.Insp of Air Solenoid Valve Was Inconclusive

/03L-0:on 810730,containment Isolation Valve V20-94 Failed to Close During Surveillance Testing.Possibly Caused by Normal Wear W/Accumulation of Minor Amounts of Dirt.Insp of Air Solenoid Valve Was Inconclusive

ML20010E702
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	08/28/1981
From:	Murphy W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20010E698	List: 05000271/LER-1981-021, Forwards LER 81-021/03L-0 05000271/LER-1981-021-03, /03L-0:on 810730,containment Isolation Valve V20-94 Failed to Close During Surveillance Testing.Possibly Caused by Normal Wear W/Accumulation of Minor Amounts of Dirt.Insp of Air Solenoid Valve Was Inconclusive
References
LER-81-021-03L, LER-81-21-3L, NUDOCS 8109080168
Download: ML20010E702 (2)

LER-1981-021, /03L-0:on 810730,containment Isolation Valve V20-94 Failed to Close During Surveillance Testing.Possibly Caused by Normal Wear W/Accumulation of Minor Amounts of Dirt.Insp of Air Solenoid Valve Was Inconclusive

Event date:
Report date:
2711981021R03 - NRC Website

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NRC FOIM 366 U. S. NUCLEAR REGULATORY COMMISSION (7 77)

LICENSEE EVENT REPORT LER 81-21/3L CONTROL BLOCK l l

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8 60 61 DOCK ET NUMBER 68 69 EVENT DATE 74 15 REPORT DATE 80 EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h 1012l l During surveillance testing, containment isolation valve V20-94 failed to I

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1 VTVYS1 05000271 LER 81-21 CAU3E DESCRIPTION AND CORRECTIVE ACTIONS Inspection of the air solenoid valve was inconclusive as to mode of failure.

Normal went with an accumulation of minor amounts of dirt is suspected.

This would cause the plunger assembly to stick in an intermediate position when actuated by the valve solenoid. The valve was cleaned, rebuilt, and satisfactorily tested prior to return to service. An evaluation of the surveillance frequency for all safety related solenoid valves is in progress to determine if additional inspection / testing is warrented.

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