ST-HL-AE-4576, Special Rept:On 930904,completed ISI of Unit 2 Sg.Tube in SG a Had Imperfection Depth Exceeding TS Limit of 40% of Nominal Tube Wall Thickness Due to Avb Wear.Tube Stabilized & Plugged

Special Rept:On 930904,completed ISI of Unit 2 Sg.Tube in SG a Had Imperfection Depth Exceeding TS Limit of 40% of Nominal Tube Wall Thickness Due to Avb Wear.Tube Stabilized & Plugged

ML20057B582
Person / Time
Site:	South Texas
Issue date:	09/16/1993
From:	Cloninger T HOUSTON LIGHTING & POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
ST-HL-AE-4576, NUDOCS 9309220265
Download: ML20057B582 (2)

Text

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The Light .

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Houston Lighting & Power l

September-16, 1993 l ST-HL-AE-4576 l File No.: G21.02  !

10CFR50.36 I

U. S. Nuclear Regulatory Commission j Attention: Document Control Desk j Washington, DC 20555 l l

South Texas Project Unit 2 Docket No. STN 50-499 Special Report Recardina Pluacina of Steam Generator Tubes Pursuant to the requirements of STP Technical Specifications 4.4.5.5a and 6.9.2, Houston Lighting & Power (HL&P) submits this '

special Report regarding plugging of Unit 2 steam generator tubes.

HL&P completed the inservice inspection of the Unit 2 steam generators on September 4, 1993. As a result of anti-vibration bar (AVB) wear, one tube in steam generator A had an imperfection depth that exceeded the Technical Specification limit of 40% of nominal tube wall thickness. This tube exhibited wear to a depth of 36%,

41%, and 45% at AVB locations 4, 3, and 2, respectively. This tube was stabilized and plugged.

Two other tubes were preventively plugged and stabilized due j to wear in the AVB area which did . not exceed the Technical Specification limit. One tube in steam generator A had experienced  !

wear to a depth of 31% at AVB 3 and 23% at AVB 4. One tube in steam generator D had experienced wear to a depth of 37% at AVB 2.

If there are any questions regarding this matter, please contact Mr. A. W. Harrison at (512) 972-7298 or me at (512) 9"'t-8787

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. H. Cl inge Vice Pr sid ,

Nuclea gineer ing B 2nntn- m JTC/pa 9309220265 930916 PDR ADOCK 05000499 C IP 1R-93\93-259.001 e 0 ;

Project Manager on Behalf of the Participants in the South Tnas Project ,

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ST-HL-AE-4576 Houston Ljghting & Power Company File No.: G21.02 Soyth Texas Project Electric Generating Station Page 2 c:

Regional Administrator, Region IV Rufus S. Scott U. S. Nuclear Regulatory Commission Associate General Counsel 611 Ryan Plaza Drive, Suite 400 Houston Lighting & Power Company Arlington, TX 76011 P. O. Box 61867 Houston, TX 77208 Lawrence E. Kokajko Project Manager U. S. Nuclear Regulatory Commission Institute of Nuclear Power Washington, DC 20555 13H15 Operations - Records Center 700 Galleria Parkway David P. Loveless Atlanta, GA 30339-5957 Sr. Resident Inspector c/o U. S. Nuclear Regulatory Comm. Dr. Joseph M. Hendrie P. O. Box 910 50 Bellport Lane Bay City, TX 77404-910 Bellport, NY 11713 J. R. Newman, Esquire D. K. Lacker Newman & Holtzinger, P.C., STE 1000 Bureau of Radiation Control 1615 L Street, N.W. Texas Department of Health Washington, DC 20036 1100 West 49th Street Austin, TX 78756-3189 ,

K. J. Fiedler/M. T. Hardt City Public Service U. S. Nuclear Regulatory Comm. i P. O. Box 1771 Attn: Document Control Desk San Antonio, TX 78295 Washington, D.C. 20555 J. C. Lanier/M. B. Lee j City of Austin Electric Utility Department 721 Barton Springs Road Austin, TX 78704 G. E. Vaughn/T. M. Puckett Central Power and Light Company i P. O. Box 2121 Corpus Christi, TX 78403 '

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