ML20010E702

LER 81-021/03L-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

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: ML20010E697 ML20010E702
References
LER-81-021-03L, LER-81-21-3L, NUDOCS 8109080168
Download: ML20010E702 (2)

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

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."$,$lL @l0l5l0l0l0l2l7l1 @l0 17 13 10 18 l1 hl 60 61 DOCK ET NUMBER 68 69 EVENT DATE 74 15 l l l REPORT DATE l l 80 lh EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h 1012l l During surveillance testing, containment isolation valve V20-94 failed to I

[ o 13 l [ close contrary te Tech. Spec. 3.7.D.1. The cause was determined to be a l l o l41 l failure 'of the three way air solenoid valve. Valve V20-95 uan shut en I lo Isl l provide cantainment isolation in accordance with Tech. Socc. 3.7.D.7. Thorn I 10 l61 I were no consecuences to nuhlic henith nnd enforv A cimilne nune o,e I l o 17 l [ reported as RO 81-17. I 10181l l 7 8 9 80 E CODE S SC OE COMPONENT CODE SUSCOD'E SU E lol91 lSlDlh W h W h IVIAl LIV 10lPIh W h bj h 7 3 9 to 11 12 >a 18 19 20

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@ W@ U@ lAl4I4lOlh 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS li lo I l Inspection of the air solenoid valve was inconclusive as to mode of failure. l l1 lil l Normal wear with an accumuintion of minor amounts of dirt is suspected. I i'

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L'_L4_J l 7 8 9 80 S  % POWE R OTHER STATUS OtS O RY DISCOVERY CESCRIPTION Ii15l W h l110l0lh! NA l l3_jhl Rurvoillnnen l ACTIVITY CC TENT RELEASED OP RELEASE AMOUNT OF ACTIVITY LOCATION OF RELE ASE NA l l NA l l1 l 68 l9 l 7.1 @10W@l 7 11 44 45 80 PERSONNEL EXPOSURES NLMBER TYPE D E SCRiPTION li l 7 I I 0101 Ol@l zl@l NA l

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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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