05000317/LER-1981-024-03, /03L-0:on 810404,during Routine Shutdown,Msiv 12 Closing Time Exceeded Tech Specs.Caused by Contamination of Valve Actuation Sys Hydraulic Fluid Resulting in Sticking Check Valves.Finer Filters Will Be Used

/03L-0:on 810404,during Routine Shutdown,Msiv 12 Closing Time Exceeded Tech Specs.Caused by Contamination of Valve Actuation Sys Hydraulic Fluid Resulting in Sticking Check Valves.Finer Filters Will Be Used

ML20027C835
Person / Time
Site:	Calvert Cliffs
Issue date:	05/01/1981
From:	Davis S, Weir P BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20027C834	List: 05000317/LER-1981-024, Forwards LER 81-024/03L-0
References
LER-81-024-03L, LER-81-24-3L, NUDOCS 8210270280
Download: ML20027C835 (1)

LER-1981-024, /03L-0:on 810404,during Routine Shutdown,Msiv 12 Closing Time Exceeded Tech Specs.Caused by Contamination of Valve Actuation Sys Hydraulic Fluid Resulting in Sticking Check Valves.Finer Filters Will Be Used

Event date:
Report date:
3171981024R03 - NRC Website

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. u 2 l ourina a routine shutdowr., the operator noted that #11 MSIV closino tire l

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4 o 3.I acceared to be excessive. A subscouent test revealed All MSIV shut with-1

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El in the reouired time, hcuever. il2 MSIV closina time exceeded the maxi-l P4 rnum at 7.4 sec. (T.S. 3.7.1.5).

=12 MSIV was reoaired ar.d returned to I

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service at 0140 on 4-8-81.

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,gI ation at the time of disccverv the safety of the cublic was not affected.

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LER 81-07 (50-318) describes a siniidr event.

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Contamination of the hydraulic fluid in the valve actuation system has I

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hgl hydraulic oressure to the actuator.

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