ML20041F748

LER 82-003/03L-0:on 820203,containment Isolation Valve Associated W/Gas Vent Header HCV-507A Failed to Close on Demand.Caused by Solenoid Valve Plunger Sticking in Energized Position.Plunger Freed

ML20041F748
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
ML20041F744	List: ML20041F743 ML20041F748
References
LER-82-003-03L, LER-82-3-3L, NUDOCS 8203170380
Download: ML20041F748 (4)

Text

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- LICENSEE EVENT REPORT (PLEASE FRINT OR TYPE ALL REQUIRED INFORMATION)

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h lol2l l During routine operations at approximately 99% power, the containment isolation valvel

[H l3l l associated with the " gas vent header", (HCV-507A), failed to close upon demand. Emer-l

[ o t .i l [ gency procedure, EP-25, " Loss of Containment Integrity", was immediately issued and l

[ois) lfollowed. An emergency Maintenance Order (M.O.) was written to correct the problem l j o ls 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 g l o l 7 l l Technical Specification 2.0.1(1) . During the incident, the redundant isolation valve,l

[ o lH i lItCV-507B, remained operable and closed upon demand. l h 9 80 7

SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUSCODE COMPONEN T CODE SUBCODE SV8 CODE lolui l s l D I@ lEJ@ lB l@ l Vl Al Ll Vl 0l to Pl@ g@ g @ 20 7 H 9 10 11 _ 12 13 19 SE QUE N T I AL OCCURRENCE HEPORT R EVISION

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34  ?> .56 40 44 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Iilo I l Emergency M.0. #13830 was written to correct the valve problem. It was discovered I IiIil Ithat the solenoid valve plunger had stuck in the " energized position." The solenoid i I1 1>I Iplunger was freed and the valve was cycled several times to verify operability l I i i i I l prior to returning to an operable status. I I

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/ 8 1 80 F ArlLITY METHOD OF S T A 1 U'i ,*rWFH OTHE H S T A TUS DiSCOvt HY DISCoVEHY DESCRIPTION 32 l1 15 l W@ l0 l919 lhl 7 8 3 la 12 11 NA 44 l lAl@l46 45 Operator Observation 80 l

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NAYE OF Pr*EPARER PHONE:

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l 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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LER 82-003 Omaha Public Power District Fort Calhoun Station Unit No. 1 Docket No. 05000285 ATTACHMENT NO. 2 Corrective Action M.O. #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 cleaned and the solenoid, as well as the valve, were satis-factorily tested and returned to operable status. Since the valve was i 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 shutdown), the plant remained at approxi-mately 99% power.

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LER 82-003 Omaha Public Power District Fort Calhoun Station Unit No. 1 Docket No. 05000285 ATTACHMENT NO. 3 Failure Data This is the first reportable failure of a containment isolation valve due to a solenoid valve malfunction'at the Fort Calhoun Station.

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