05000334/LER-1981-049-03, /03L-0:on 810508,main Steam Trip Valve TV-MS-101B Would Not Stroke in Required Time Envelope on Steam Line Isolation.Caused by Solenoid Orifices Being Coated W/Dust & Residue,Restricting Air Flow When Venting Air Pistons

/03L-0:on 810508,main Steam Trip Valve TV-MS-101B Would Not Stroke in Required Time Envelope on Steam Line Isolation.Caused by Solenoid Orifices Being Coated W/Dust & Residue,Restricting Air Flow When Venting Air Pistons

ML20004F694
Person / Time
Site:	Beaver Valley
Issue date:	06/06/1981
From:	Lacey W DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20004F691	List: 05000334/LER-1981-049, Forwards LER 81-049/03L-0 05000334/LER-1981-049-03, /03L-0:on 810508,main Steam Trip Valve TV-MS-101B Would Not Stroke in Required Time Envelope on Steam Line Isolation.Caused by Solenoid Orifices Being Coated W/Dust & Residue,Restricting Air Flow When Venting Air Pistons
References
LER-81-049-03L, LER-81-49-3L, NUDOCS 8106220194
Download: ML20004F694 (2)

LER-1981-049, /03L-0:on 810508,main Steam Trip Valve TV-MS-101B Would Not Stroke in Required Time Envelope on Steam Line Isolation.Caused by Solenoid Orifices Being Coated W/Dust & Residue,Restricting Air Flow When Venting Air Pistons

Event date:
Report date:
3341981049R03 - NRC Website

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&B 69 EVENT DATE 74 - 75 REPORT DATE 80 g 'IMain Steam Trip Valve [TV-MS-101B] h EVENT DESCRIPr10N AND PRCOA8tE CONSEQUENCES would not stroke in the required time envelope I

' r.nu l required by Technical Specifications 3.6.3.1 and 3.7.1.5 on steam line isolation.

I pit 1 lThere were very minimal safety consequences to this valve failure since the time 1

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L1,1,,tj iflow when mnting air pistons. The solenoids neve cleaned and the valve testod I

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Attachment To LER 81-49/03L

. Beaver. Valley. Power Station Duquesne Light Company.

Docket No. 50-334.

s, No further information-is available or needed to satisfy the reporting

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