ML20005F521

Application for Amend to Licenses DPR-77 & DPR-79,revising Tech Specs to Allow Operation to Continue W/Diesel Generator Sets Inoperable Provided Four Diesel Generator Sets Returned to Operable Status within 72 H

ML20005F521
Person / Time
Site:	Sequoyah
Issue date:	01/05/1990
From:	Michael Ray TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20005F522	List: ML20005F521 ML20005F533
References
NUDOCS 9001160357
Download: ML20005F521 (2)

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TENNESSEE VALLEY AUTHORITY CHATTANOOGA. TENNESSEE 37401 1 5N 157B Lookout Place JAN 051830 TVA-SQN-TS-90-04 10 CFR 50.90 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555

-Gentlemen:

In the Matter of ) Docket Nos. 50-327 *

' Tennessee Valley Authority ) 50-328 I

SEQUOYAH NUCLEAR PLANT (SQN) - TECHNICAL SPECIFICATION (TS) CHANGE 90 . DIESEL GENERATOR ACTION REQUIREMENTS ,

In accordance with 10 CFR 50.90, we are enclosing a requested amendment to licenses DPR-77 and DPR-79 to change the TSs of.SQN Units 1 and 2. The proposed change revises Action Statement a of Limiting Condition for Operation (LCO) 3.8.1.1 to allow operation to continue with diesel generator Set (s) 1A-A and/or 2A-A or 18-B and/or 2B-B inoperable provided all four diesel generator sets are returned to operable status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. This change provides '

consistency with other action statements for loss of a train of safety equipment.

The proposed TS change is identified in Enclosure 1. The justification for the proposed TS change is provided in Enclosure 2. A proposed determination of no significant hazards consideration performed pursuant to 10 CFR 50.92 is provided in Enclosure 3. i TVA is presently performing maintenance / repairs (duration approximately 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />) on the essential raw cooling water (ERCH) strainers at SQN. ,

Maintenance on the ERCH strainers requires isolation of the associated headers and entry into a 72-hour action statement. This action statement provides sufficient time to complete the work on the Unit 2 strainers. However, as ,

discussed in Enclosure 2, the Unit 1 ERCH headers supply primary cooling water

-to the four emergency diesel generators. Therefore, under present TSs, isolation of either of the Unit i headers would render two diesel generators inoperable and require both SQN units to enter a seven-hour action statement ,

' required by LC0 3.0.3.

'The maintenance / repair of the Unit 1 ERCH strainers is scheduled to begin on '

January 19, 1990, based on both environmental conditions (temperature of the ultimate heat sink) and impact on the refueling outage scheduled to begin in March 1990. TVA has evaluated several options to maintain the diesel generators operable during the Unit 1 ERCH strainer maintenance. Each of these options would require significant amount of engineering work and physical plant modifications. TVA believes that pursuit of these options is not a prudent expenditure of resources. Therefore, TVA requests that this TS 003o change be processed on an exigent basis to allow the Unit 1 ERCH strainer maintenance / repair to begin on January 19, 1990, kj Please note that TVA.'s Nuclear Safety Review Board is performing its review of this proposed change in parallel with NRC's review.

m 9001160357 DR 9001os p ADOCK0500g7 An Equal Opportunity Employer

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. -2 JAN 051990

[ U.S. Nuclear Regulatory Commission i

f-Please direct questions concerning this issue to B. S. Schofield at (615) 843-6172.

1 Very truly yours, r-,.

L TENNESSEE VALLEY AUTHORITY ct M. J. Ray, Man er p Licensing Project Management Sworn to nd subscr ed before me o this' , day of 1990

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KoTari Public Ny Commission Expires L

Enclosures cc: Ms. S. C. Black, Assistant Director (Enclosures) for Projects TVA Projects Division U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852 Mr. B. A. Wilson, Assistant Director (Enclosures) for Inspection Programs l- TVA Projects Division U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Mr. Michael H. Mobley, Director Division of Radiological Health i T.E.R.R.A. Building 150 9th Avenue, N Nashville, Tennessee 37203 NRC Resident Inspector (Enclosures)

Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy Daisy, Tennessee 37379 American Nuclear Insurers (Enclosures)

Attention: Librarian The Exchange, Suite 245 270 Farmington Avenue Farmington, Connecticut 06032