ML20248C847

Provides Rev to Commitment Made in Util to NRC Re SER on short-circuit Study,Medium Voltage (6.9-kV) Sys. Detailed Description & Implementation Schedule for Resolution of Issue Will Be Submitted to NRC by 891020

ML20248C847
Person / Time
Site:	Sequoyah
Issue date:	08/04/1989
From:	Michael Ray TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 8908100167
Download: ML20248C847 (3)

Text

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-TENNESSEE VALLEY AUTHORITY CH ATTANOOGA, TENNESSEE 37401 SN 1578 Lookout Place AUG 041989 U.S. Nuclear Regulatory Commission

'ATIN: Document Control Desk Washington, D.C.

20555 Gentlemen:

In the Matter of

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Docket Hos. 50-327 Tennessee Valley Authority

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50-328 SEQUOYAH NUCLEAR PLANT - FAULT CURRENT PROBLEM FOR THE 6.9-KILOV0LT (kV) UNIT BOARD LOAD BREAKERS

References:

1.

TVA letter to NRC dated August 10, 1987, "Sequoyah Nuclear Fiant (SQN) - Comments on Safety Evaluation Report (SER) -

Short-Circuit Study, Medium Voltage (6.9-kV) System" 2.

NRC letter to TVA dated May 18, 1988, " Safety Evaluation Report on the Tennessee Valley Authority Sequoyah Nuclear Performance Plan (NUREG-1232, Volume 2)"

3.

NRC letter to TVA dated May 27, 1988, " Notice of Violation (NRC Inspection Report Nos. 50-327/88-19 and 50-328/88-19)"

This letter provides a revision to a commitment mode in Reference 1.

The comr.itaient to develop a schedule to correct the fault current problem for the 6.9-kV unit board load breakers after Unit 2 restart was further clarified in References 2 and 3 to identify a June 29, 1989, due date.

TVA is in the process of completing its review of the fault current problem for the 6.9-kV unit board breakers.

Five options have currently been identified as possible solutions.

The economic considerations, as well as the technical merits of each of thtse options, are being explored fully.

TVA will provide a detailed description and the implementation schedule for the resolution of this issue to NRC by October 20, 1989. This issue is not a nuclear safety concern.

The revised commitmer.t is summarized in the enclosure.

Please direct questions to B. S. Schofield at (615) 843-6172.

Very truly yours, TENNESSEE VALLEY AUTHORITY r

Manager, uclear Licensing and Regulatory Affairs D'losure 003o cc:

See page 2 8908100167 890804

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An Equal opportunity Employer

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U.S. Nuclear Regulatory Commission M 0'04 M9

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cc (Enclosure):

Ms. S. C. Black, Assistant Director for. Projects TVA Projects Division j

U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852 l

Mr. B. A. H11 son', As'sistant Director for Inspection Programs TVA Projects. Division l

.U.S. Nuclear Regulatory Commission Region II 101'Marietta Street, NW, Suite 2900 Atlanta, Georgia ~ 30323 1

NRC Resident. Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road I.

Soddy Daisy, Tennessee 37379 1

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