ML20245F316

Responds to NRC Bulletin 89-001, Failure of Westinghouse Steam Generator Tube Mechanical Plugs. Determination That Westinghouse Mechanical Plugs from Heat Numbers 3279,3513, 3962 & 4523 Not Installed at Plant Noted

ML20245F316
Person / Time
Site:	Yankee Rowe
Issue date:	06/16/1989
From:	Drawbridge B YANKEE ATOMIC ELECTRIC CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
BYR-89-104, IEB-89-001, IEB-89-1, NUDOCS 8906280095
Download: ML20245F316 (2)

Text

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580 Main Street, Bolton, Massachusetts 01740-1398 YA5'KEE June 16, 1989 BYR- 89-104 United States Nuclear Regulatory Commission Document Control Desk Washington, DC 20555

References:

(a) License No. DPR-3 (Docket No. 50-29)

(b) NRC Bulletin No. 89-01, " Failure of Westinghouse Steam Generator Tube Mechanical Plugs," dated May 15, 1989 (c) Westinghouse Report WCAP-12244, " Steam Generator Tube Plug Integrity Summary Report," April 1989 (d) Letter, YAE-89-521, Westinghouse to Yankee Atomic Electric Company, Yankee Plant at Rowe, " Westinghouse Mechanical Plugs"

Subject:

Response to NRC Bulletin 89-01: Failure of Westinghouse Steam Generator Tube Mechanical Plugs

Dear Sir:

Bulletin No. 89-01, Reference (b), requested Yankee to verify that information contained in Reference (c) specifically related to the Yankee Nuclear Power Station (YNPS) was correct. It has been determined, based upon a review of Yankee records and Westinghouse records, Reference (d), that the Westinghouse mechanical plugs from Heat Numbers 3279, 3513, 3962, and 4523 have not been installed in the YNPS steam generators.

The mechanical plugs, which have been installed in the YNPS steam generators, are from Westinghouse Heat Numbers 1989 and 2387. The material of these mechanical plugs has been characterized as having a continuous carbide distribution at the grain boundary providing the greatest resistance to stress corrosion cracking. Should any of these plugs be removed from the YNPS steam generators, a sampling will be examined for primary water stress corrosion cracking and records maintained of these examinations (Reference (b),

Action 2e). Yankee will give careful consideration to future Westinghouse recommendations applicable to Heat Numbers 1989 and 2387.

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.We trust.this information is satisfactory; however, if you have any questions, please contact us'- .

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Very truly your YANKE TOMIC ELEC IC COMPANY r

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Bruce L. Drawb 'dge Vice President an nager of Operations BLD/ pac /0404v-cc: USNRC Region I

'USNRC Resident Inspector, YNPS COMMONWEALTH OF MASSACHUSETTS)

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Then personally appeared before me, B. L. Drawbridge, who, being duly sworn, did~ state that he is Vice President and Manager of Operations of Yankee Atomic Electric Company, that he is duly authorized to execute and file the foregoing document in the name and on the behalf of Yankee Atomic Electric

. Company and that the statements therein are true to the best of his knowledge and belief.

AhAbsb. ann M(7u, f Helen D.'Sammarco Notary Public My Commission Expires November 7, 1991

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