ML20028B545

LER 82-019/03L-0:on 821024,MSIVs HCV-1041A & HCV-1042A Stopped Three to Four Degrees Off Seat When Signaled to Close.Caused by Binding Between Valve Packing & Shaft. Packings Sprayed W/Penetrant Oil

ML20028B545
Person / Time
Site:	Fort Calhoun
Issue date:	10/28/1982
From:	Abel S OMAHA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20028B541	List: ML20028B540 ML20028B545
References
LER-82-019-03L, LER-82-19-3L, NUDOCS 8212030013
Download: ML20028B545 (4)

Text

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REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o l2l l On October 24, 1982, at approximately 1624, while the plant was in a cold shutdown l o ;3 g l condition, the Main Steam Isolation Valves, ECV-1041A and HCV-1042A, were signaled l n j,3 l to close by the plant operators; however, the valves stopped closing three to four l o ;3 g l degrees off their seat. Investigation into the problem revealed that binding l O 16 I l between the valve packing and shaft precluded full closure. l 0171 I I o tsi i l 8 9 80 DE CODE S SC E COMPONENT CODE Su dE SU E 019l 8 9 lC lD l@ ]@ ]@ l V l Al L l V l E l X l@ g@ { @

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,iloll Two Maintenance Orders were written to investigate and correct the problem. The l l

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LER No.82-019 Omaha Public Power District Fort Calhoun Station Unit No. 1 Docket No. 05000285 ATTACHMENT NO. 1 Safety Analysis The purpose of the main steam isolation valves is to limit the uncontrolled cooldown of the reactor coolant system in the case of a main steam line break between the turbine and-one of the isolation valves. If a break occurs between one steam generator and its asso-ciated main steam isolation valve, valve closure' limits the blowdown of the affected steam generator (s).

During this incident, the plant was in a cold shutdown condition to repair leakage from hand hole gaskets on the steam generators. The main steam isolation valves were cycled closed to prevent venting of contain-ment atmosphere through the steam lines during repairs to the' hand holes. During this cycling, the valves stopped closing three to four degrees off the seat. Under power operating conditions, if the main steam isolation valves had been signaled to close, the flow of steam in the lines would have forced the swing disc to seal against the valve seat, thus ensuring full closure.

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LER No.82-019 Omaha Public Power District Fort Calhoun Station Unit No. 1 Docket No. 05000285 ATTACHMENT.NO. 2 Corrective Action When it was discovered that the valves did not seat, two Mainte-nance Orders were written to correct the problem. The valve packings were sprayed with a penetrant oil and were then cycled satisfactorily.

Surveillance Test ST-ISI-MS-1 (F.2) was performed to verify and document proper operability of both valves.

No further corrective action is considered necessary as this particular malfunction involving excessive friction between the packing and the valve shaft has not been a recurring problem. The valves are stroked each refueling outage and verified operable per the applicable Surveillance Test.

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LER No.82-019 Omaha Public Power District Fort Calhoun Station Unit No. 1 Docket No. 05000285 ATTACHMENT NO. 3 Failure Data This was the third occurrence of main steam isolation valve HCV-1042A failing to close within the four second time limit delineated by Technical Specification 2.5. This was the second occurrence for isola-tion valve HCV-1041A.

Other events involving these valves were reported as:

1. Abnormal Occurrence 73-8: Failure of Main Steam isolation Valve llCV-1041A to close in four seconds under no flow conditions.

2. Abnormal Occurrence 74A-2: Failure of Main Steam Isolation Valve llCV-1042A in the open position.

3. Abnormal Occurrence 74-16: Failure of Main Steam Isolation Valve llCV-1042A to close in less than four seconds under no flow conditions.

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