05000285/LER-1982-003

LER 82-003/03L-1:on 820201,containment Isolation Valve HCV-507A Failed to Close Upon Demand.Caused by Solenoid Valve Plunger Stuck in Energized Position.Plunger Freed & Valve Cycled.Emergency Procedure & Maint Order Issued

ML20054J526
Person / Time
Site:	Fort Calhoun
Issue date:	02/17/1982
From:	Mueller R OMAHA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20054J524	List: 05000285/LER-1982-003, Forwards LER 82-003/03L-1
References
LER-82-003-03L, LER-82-3-3L, NUDOCS 8206290176
Download: ML20054J526 (4)

LER-2082-003,

Event date:
Report date:
2852082003R00 - NRC Website

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NRC FORM .V,6 U. S. NUCLE AR T.EGULATORY COMMISSION

! LICENSEE EVENT REPORT i'

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h

[ O l 21 l During routine operations at approximately 992; cower, the containment isolaticn v11va i g jassociated with the " gas vent header", (HCV-507A), failed to close upon demand. Emer-l

o g 4, lgency procedure, EP-25. " Loss of Containment integrity", was immediately issued and I

, g lfollowed. An emergency Maintenance Order (M.O.) was written to correct the problem l l 0 l r, l land the valve was restored to an operable status within the 6 hour6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> time constraint of I

! l O 17 lT I echnical Specification 2.0.l(1). During the incident, the redundant isolation valve.I ioig, lHCV-507B, remained operable and closed upon demand. I i7 8 9 50 DE CODE SU8C E COMPONENT CODE st.,9C DE $ E

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CAUSE CESCmPTioN AND CORRECT!vE ACTIONS i l t j o l lEmergency M.0. #13830 was written to correct the valva orelm. It was discovered 1 y lthat the solenoid valve plunger had stuck in the "enernizad position" TFe scienoid  !

j , , jplunger was freed and the valve was cycled several times to verify operability orlor I g lto returning to an operable status. l I

L' l_* ! I 80 7 8 9 STA S  % POWER OTHER ST ATUS Disc FY DISCOVERY DESCRIPTION NA Operator Observation i s lE l@ l 019 l 9 "l@l" l l" A l@l l AEiviTY cOSTENT RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE

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NAME oF PnEPARER PHONE-

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LER 82-003 Omaha Public Power District Fort Calhoun Station Unit No. 1 Docket NO. 05000285 ATTACHMENT NO. 1 Safety Analysis The Fort Calhoun Station is designed such that no single failure, by itself, can adversely affect the safe shutdown of the plant.

The function of HCV-507A (and its redundant valve HCV-507B) is to isolate the gas vent header at the containment boundary when activated by a Containment isolation Actuation Signal. Both HCV-507A and HCV-507B are energize-to-open/ fail closed valves. During the time HCV-507A was inoperable due to a stuck solenoid valve plunger, the redundant valve HCV-507B was operable and would have been capable of isolating the vent header at the containment pressure boundary had it been necessary.

During the time HCV-507A was being repaired, the operation of HCV-507B was verified by cycling the valve.

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t LER 82-003 Omaha Public Power District Fort Calhoun Station Unit No. 1 Docket No. 05000285 ATTACHMENT ;0. 2 Corrective Action M.0. #13830 was written to investigate the closure problem with HCV-507A. Subsequently, it was determined that the solenoid plunger had stuck in the " energized" position, thereby not allowing air to vent from the operator and allow the valve to close. The solenoid plunger was freed and the solenoid was satisfactorily tested and returned to oper-able status. Since the valve was returned to status in less than 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> (the time allowed for repair without having to attain hot shut-down), the plant remained at approximately 99% power. As a further precaution, the HCV-507A solenoid was changed out with a spare per M.O.

1. 14010 (on 2/17/82). Upon solenoid replacement, the HCV-507A valve was satisfactorily tested for operability per applicable portions of sur-veillance test ST-ISI-WD-1, F.1.

LEP.82-003 Omaha Public Power District Fort Calhoun Station Unit No. 1 Docket No. 05000285 ATTACIDIE:;T ;io. 3 Failure Data This is the first reportable failure of a containment isola tion valve due to a solenoid valve malfunction at the Fort Calhoun Station.