ML20213F860

Final Part 21 Rept Re Velan Main Steam to Auxiliary Feedwater Pump Isolation Valve MS-107A Received W/O Stellite on Valve Disc Guide Faces.Initially Reported on 861031.Item Not Reportable Per 10CFR21

ML20213F860
Person / Time
Site:	Davis Besse
Issue date:	11/05/1986
From:	Williams J TOLEDO EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
REF-PT21-86-364-000 1-680, PT21-86-364, PT21-86-364-000, NUDOCS 8611170218
Download: ML20213F860 (2)

Text

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TOLEDO EDISON Docket No. 50-346 JOE WILUAMS, JA License No. NPF-3 73JLU37 ~ "

(419] F43 5223 Serial No. 1-680 November 5, 1986 Mr. James G. Keppler, Regional Administrator United States Nuclear Regulatory Commission R gion III 799 Roosevelt Road Glen Ellyn, IL 60137

Dear Mr. Keppler:

On October 31, 1986, notification was made to Mr. P. Wohld of your staff i of potential 10CFR21 defects related to the condition of certain gate valves manufactured by the Velan Valve Company.

A deviation in the as-delivered condition of MS-107A, Main Steam to Auxiliary Feedwater Pump Isolation Valve, from the engineered / designed condition is the absence of stellite (0.055 in.) from the valve disc guide faces. The absence of stellite from the disc guide face is a departure from the requirements of the procurement document; however, further evaluation indicates that this condition does not create a substantial safety hazard.

This deviation was noted during examination of the original valve disc from MS-107A. The disc was replaced due to a failure of the disc to stem connection. This failure was caused by inadvertent overtorquing of MS-107A during closure. Inspection of the valve showed no indication of abnormal valve internal wear due to the lack of the stellite facing. MS-107A had been in service without the stellite facing on the disc guides for the life of the plant and had no failures where this type of deviation could be the root cause. Further investigation of recent motor operated valve full flow closure tests indicates that a lack of stellite nay not be a major contributor to failure of valves tested at full flow to close.

For these reasons, the lack of stellite on the disc guide faces for MS-107A or other Velan manufactured gate valves is not believed to create a substantial safety hazard. Therefore, this condition is not reportable under 10CFR21.

By this letter, Toledo Edison herein withdraws its notification of the potential 10CFR21 concerning Velan gate valves without stellite facing on the valve disc guides.

F611170218 861105 DR ADOCK 0500 6 gV 10R THE TOLEDO EDISON COMPANY EDISON PLAZA 300 MADISON AVENUE TOLEDO. OH:0 43652 1 x 5If

Docket No. 50-346 License No. NPF-3 j Se' rial No. 1-680 November 5, 1986 Page 2 Toledo Edison is presently evaluating a second potential 10CFR21 defect regarding motor operated valves as reported in the aforementioned notification concerning the difference between the results of calculations provided by the valve vendor and the actual required thrust to open and close the valves under test conditions simulating design differential pressure and flow. We will inform you of the results of our evaluation by November 18, 1986.

Very truly yours, i b/ f l (.

W:JCS:plf cc: DB-1 NRC Resident Inspector J. Taylor (OI&E)

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