05000213/LER-1985-001, :on 850114,body-to-bonnet Steam Leak Found on Containment Isolation Valve MS-TV-1212.Caused by Foreign Matl Under Valve Seats.Inservice Test Schedule Revised from Cold Shutdown to Every 3 Months

:on 850114,body-to-bonnet Steam Leak Found on Containment Isolation Valve MS-TV-1212.Caused by Foreign Matl Under Valve Seats.Inservice Test Schedule Revised from Cold Shutdown to Every 3 Months

ML20209H399
Person / Time
Site:	Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png
Issue date:	09/10/1986
From:	Graves R, Michael Turner CONNECTICUT YANKEE ATOMIC POWER CO.
To:	NRC OFFICE OF ADMINISTRATION (ADM)
References
LER-85-001, LER-85-1, NUDOCS 8609150240
Download: ML20209H399 (4)

LER-1985-001, on 850114,body-to-bonnet Steam Leak Found on Containment Isolation Valve MS-TV-1212.Caused by Foreign Matl Under Valve Seats.Inservice Test Schedule Revised from Cold Shutdown to Every 3 Months

Event date:
Report date:
Reporting criterion:	10 CFR 50.73(a)(2)(v), Loss of Safety Function
2131985001R00 - NRC Website

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A85TR ACT (Lem t to F400 weces o e. sooroarmerey rdreen smre noece rvoe*r rsen heest (166 MS-TV-1212, a containment isolation valve, failed to close during a surveillance test conducted August 23, 1984. The plant was shutdown for refueling and I

maintenance. The valve was repaired and retested satisfactorily. The valve l

also functioned properly during a subsequent containment isolation test.

A body-to-bonnet steam leak was found on MS-TV-1212 during a routine inspection on January 14, 1985. The body-to-bonnet bolts were tightened but the steam leak continued. An attempt to stroke the valve to verify operability was unsuccessful. A manual isolation valve, located downstream was lock-closed l

in order to provide containment isolation.

Furmanite was injected into l

PS-TV-1212 to stop the steam leak. The valve was repaired during the 1986 l

refueling outage.

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It has been concluded that the failure of MS-TV-1212 was an isolated event. The bases of this conclusion are:

1) As-found tests prior to 1984 were I

satisfactory, 2) Foreign material caused the 1985 operability failure, eliminating valve design concerns, 3) MS-TV-1213, the same valve model in similar service, continued to operate satisfactorily, and 4) A recent test after a period of service indicates MS-TV-1212 is operating satisfactorily, 8609150240 860910 PDR ADOCK 05000213

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EVENT DESCRIPTION

MS-TV-1212 failed to close during a surveillance test.

The surveillance test was conducted August 23, 1984, during a plant shutdown for refueling and maintenance. The valve was repaired and retested satisfactorily. The valve also functioned properly during a subsequent containment isolation test.

A body-to-bonnet steam leak was found on MS-TV-1212 during a routine inspection on January 14, 1985. The body-to-bonnet bolts were tightened. The steam leak continued. An attempt to stroke the valve to verify operability was unsuccessful. The valve would not close. A manual isolation valve was lock-closed downstream, in order to provide containment isolation.

Furmanite was injected into MS-TV-1212 to stop the steam leak. The valve was repaired during the 1986 refueling outage.

REPORTABILITY

This event is reportable per 10CFR50.73(a)(2)(v)(C) as MS-TV-1212 is relied on to contain contaminated material.

VALVE FUNCTION MS-TV-1212 is an air operated valve that closes on receipt of a containment isolation signal. MS-TV-1212 is located on the main steam line drain header.

The valve discharges to the steam generator blowdown tank.

VALVE FAILURE The cause of the August 23, 1984, failure of MS-TV-1212 to close could not be determined even though a bent stem was reported. This is because it could not be determined if the stem was bent before maintenance or during maintenance. A post-maintenance test indicated that the valve was operating properly.

MS-TV-1212 was repaired during the 1986 refueling outage due to the January 14, 1985 failure.

Foreign material was found under the valve seats. An analysis determined that the material was AIS1 410. The source of the foreign material could not be identified as AISI 410 is a common material. A post-maintenance retest indicated that the valve was functioning properly.

An additional test conducted on July 22, 1986, during a cold shutdown, showed that MS-TV-1212 was operating satisfactorily after two months of service.

MS-TV-1213 is the same valve model as MS-TV-1212 and experiences similar service conditions. There have not been any operability problems associated with MS-TV-1213 during this time interval.

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SAFETY CONSEQUENCES

MS-TV-1212 is the only valve that automatically isolates the main steam drain line header to the blowdown tank. MS-TV-1212 closes upon receipt of a containment isolation signal.

The inability of MS-TV-1212 to close is not an unanalyzed condition. The main steam lines do not become a leakage path of the containment atmosphere during a design' basis loss of coolant accident. The steam generator tube rupture analysis (Calculation No. XX-XXX-57RA) assumes that all radionuclides are released. Therefore, any leakage past MS-TV-1212 is accounted for.

CORRECTIVE ACTION

It is concluded that the failure of MS-TV-1212 was an isolated event. The bases of this conclusion are:

1) As-found tests prior to 1984 were satisfactory, 2)

Foreign material caused the 1985 operability failure, eliminating valve design concerns, 3) MS-TV-1213, a similar valve wit! similar service conditions continued to operate satisfactorily, and 4) A recent test after a period of service indicates MS-TV-1212 is operating satisfactorily.

The inservice test schedule for MS-TV-1212 and MS-TV-1213 has recently been revised from cold shutdown to every three months. This change is a result of a review of the valve inservice test program. This will reduce the probability that MS-TV-1212 or MS-TV-1213 are in operable while inservice.

RELATED LICENSEE EVENT REPORTS This LER updates the information provided in LER 84-016-00 and LER 85-001-00.

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CONNECTICUT YANKEE ATO MIC POWER COMPANY HADDAM NECK PLANT RR 41. BOX 127E EAST H AMPTON, CONN. 06424 September 11, 1986 U.S. Nuclear Regulatory Commission Document Control Desk Washington, D. C.

20555

Reference:

Facility Operating License No. DPR-61 Docket No. 50-213 Reportable Occurrence LER 50-213/85-001-01 Gentlemen:

This letter forwards the Licensee Event Report 85-001-00, required to be submitted within 30 days, pursuant to the requirement of Connecticut Yankee Technical Specifications.

Very truly yours,

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Richard H. Graves Station Superintendent RHG: MET / lac

Attachment:

LER 85-001-00 cc:

Dr. T. E. Murley, Region I i

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