05000318/LER-1981-031-03, /03L-0:on 810619,bypass Dampers Did Not Shut W/Damper Control Handswitch in Filter Position,Resulting in ECCS Pumproom Exhaust Fan Inoperability.Caused by Air Solenoid Valve Leaking Through Maintaining Air Pressure

/03L-0:on 810619,bypass Dampers Did Not Shut W/Damper Control Handswitch in Filter Position,Resulting in ECCS Pumproom Exhaust Fan Inoperability.Caused by Air Solenoid Valve Leaking Through Maintaining Air Pressure

ML20009E446
Person / Time
Site:	Calvert Cliffs
Issue date:	07/17/1981
From:	Junge M, Rizzo P BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20009E441	List: 05000318/LER-1981-031, Forwards LER 81-031/03L-0 05000318/LER-1981-031-03, /03L-0:on 810619,bypass Dampers Did Not Shut W/Damper Control Handswitch in Filter Position,Resulting in ECCS Pumproom Exhaust Fan Inoperability.Caused by Air Solenoid Valve Leaking Through Maintaining Air Pressure
References
LER-81-031-03L, LER-81-31-3L, NUDOCS 8107280214
Download: ML20009E446 (1)

LER-1981-031, /03L-0:on 810619,bypass Dampers Did Not Shut W/Damper Control Handswitch in Filter Position,Resulting in ECCS Pumproom Exhaust Fan Inoperability.Caused by Air Solenoid Valve Leaking Through Maintaining Air Pressure

Event date:
Report date:
3181981031R03 - NRC Website

text

NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION (7M.

LICENSEE EVENT REPORT CONTROL BLOCK: l l

l l

l l lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6

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7 8 9 LICENSEE CODE 14 LICENJE NUMBER 25 26 LICcNSE TYPE JO 57 CAT 50 CON'T 101i1 3%%lLl@l015l0l0l0l311l8_J@l0l61119l811l@l0l711l71811l@

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60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l O 121 l At 0700 the ECCS pumoroom exhaust fans were found to be inoperable (T.

l l 0,3 l l S. 3.7.7.1).

When the Damper Control Handswitch was placed in " filter" l

lO i4 i l the Bypass Dampers did not shut. Dampers were verified fixed in the l

" filter" position with no bypass capability at 1500. This is not a l

iOisi lO to l l repetitive occurrance.

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CODE TYPE NO.

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33 34 35 36 37 40 di 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h lilOI I Found air Solenoid Valve (SV-2-SV-5408 (Versa #USG 322 11014) leakina i

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through maintainino air pressure to the Bypass Damper operator.

The fil-l 13,2; I ter Inlet Damper was immediately verified fixed open, and the Bypass I

ii i3i l Damper was shut. Replacing an SV plunger o-ring repaired the SV. A test l

ii i4 i i for SV operation will be added to the approcriate Surveillance Procedure.

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