ML20246B658

Forwards Nonproprietary WCAP-12290 & Proprietary WCAP-12289, Sequoyah Unit 1 & Unit 2 Evaluation for Tube Vibration Induced Fatigue, Per NRC Bulletin 88-002.Proprietary Rept Withheld (Ref 10CFR2.790(b)(4))

ML20246B658
Person / Time
Site:	Sequoyah
Issue date:	07/05/1989
From:	Michael Ray TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML19312B340	List: ML20246B658 ML20246B667 ML20246B683
References
IEB-88-002, IEB-88-2, NUDOCS 8907100047
Download: ML20246B658 (3)

Text

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~, J TENNESSEE VALLEY AUTHORITY CH ATTANOOGA, TENNESSEE 37401 5N 157B Lookout Place IJUL5 M9 \

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U.S. Nuclear Regulatory Commission i ATTN: Document Control Desk j Washington, D.C. 20555 '

Gentlemen:

In the Matter of )

Tennessee Valley Authority Docket Nos. 50-327

) 50 328 SEQUOYAH NUCLEAR PLANT (SQN) UNITS 1 AND 2 - NRC BULLETIN 88-02, RAPIDLY PROPAGATING FATIGUE CRACKS IN STEAM GENERATOR TUBES As required by the subject bulletin, Enclosures 1 and 2 provide the Westinghouse Electric Corporation (W) nonproprietary and proprietary reports of SQN's thermal / hydraulic analysis for steam generator tube vibration-induced fatigue. These reports identify two tubes in SQN Unit 2 steam generators as being susceptible to fatigue-induced cracking if dented. The tubes are located in Row 10, Column 60, of Steam Generator 1 and Row 9, Column 60, of Steam Generator 4. Neither of the two tubes was determined to be dented by TVA's subsequent review of the data. data eddy current contractor analyst or the H data analyst during a Enclosure 3 provides the W safety review checklist for this analysis.

The long-term corrective action plan required by the actions requested section of the subject bulletin, Step C.2, has been fully implemented for Unit 1. The Row 10, Column 44, tube in Steam Generator I was stabilized and plugged in (

June 1988. The long-term corrective action plan for Unit 2 is to stabilize and plug the Row 10, Column 60, tube of Steam Generator 1 and the Row 9, outage. 60, tube of Steam Generator 4 during the Unit 2 Cycle 4 refueling Column Additionally, TVA has implemented an enhanced, primary-to-secondary leak rate monitoring program for both SQN units.

Because Enclosure 2 contains information proprietary to W, it is supported by an affidavit signed by W, the owner of the information. The affidavit provided in Enclosure 4 sets forth the basis on which the information may be withheld from public disclosure by the Commission and addresses with specificity the considerations listed in paragraph (b)(4) of Section 2.790 of the Commission's regulations. Accordingly, it is respectfully requested that the information that is proprietary to W be withheld from public disclosure in accordance with 10 CFR Section 2.790 of the Commission's regulations.

Correspondence with respect to the proprietary aspects of the application for withholding or the supporting W affidavit should reference CAW-89-075 and ,

should be addressed to R. A. Wiesemann, Manager of Regulatory and Legislative Affairs, Westinghouse Electric Corporation, P.O. Box 355. Pittsburgh, Pennsylvania 15230-0355. ,

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U.S. Nuclear Regulatory Commission JUI. 5 1989 L The summary statement of the commitment contained in this submittal is provided in Enclosure 5. Please direct questions concerning this issue to K. S. Whitaker at (615) 843-7748.

Very truly yours, TENNESSEE VALLEY AUTHORITY 6' ,f9 Manager, Nuclear icensing and Regulatory Affairs Enclosures -

cc (w/o Enclosures 1 and 2):

Ms. S. C. Black, Assistant Director for Projects TVA Projects Division U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852 Mr. B. A. H11 son, Assistant Director for Inspection Programs TVA Projects Division U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 NRC Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy Daisy, Tennessee 37379

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l ENCLOSURE 1 WCAP-12290 l EVALUATION FOR TUBE VIBRATION INDUCED FATIGUE j (NONPROPRIETARY)

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