ML20003B708

Interim Deficiency Rept Re Improper Cable Tray Hanger Design,Initially Reported on 801205.Stress Analyses Will Be Performed on Connections.Design Process Is Under Review. Next Rept Will Be Sent on 810301

ML20003B708
Person / Time
Site:	South Texas
Issue date:	01/07/1981
From:	Oprea G HOUSTON LIGHTING & POWER CO.
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
10CFR-050.55E, 10CFR-50.55E, ST-HL-AE-595, NUDOCS 8102250272
Download: ML20003B708 (4)

Text

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7/U The Light l company s_ uy,,- m m m,<, n_.mm,m msmo January 7,1981 l ST-HL-AE-595 SFN: V-0530 e 19 Mr. Karl Seyfrit A Director, Region IV 8 jf[j f 6 g Nuclear Regulatory Commission }

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Dear Mr. Seyfrit:

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Units 1&2 El Docket Nos. STN 50-498, STN 50-499 Interim Report Concerning Cable Tray Hanger Design On December 5,1980, in accordance with 10 CFR 50.55(e), Houston Lighting

& Power Company notified your office of an item concerning cable tray hanger design for the South Texas Project. During a design review it was found that for one type of hanger design, a connection between a hanger beam and vertical leg was based in part on an improper cross reference to a standard design.

This was detected after initial design verification reviews had been completed and hangers had been fabricated and erected.

The following actions are underway. First, each affected location will be subject to a stress analysis and, where reouired, modification will be made to strengthen the connection. Preliminary analysis indicates that although some cornections will require modification to re-estat.lish design margins, none would fail if left uncorrected; i.e., stress would exceed yield allowables but not ultimate allowables. Second, the design process used for all non-standard cable tray hanger designs is being reviewed to determine if there are concerns with other types of completed hanger designs. Third, the design control system for Class IE electrical cable tray hangers is being reviewed to detemine whether there is a need for additional design controls.

The next interim report will be sent to you on March 1,1981.

If there are any questions about this item, please contact Mr. Michael E.

Powell at (713) 676-8592.

Very trul yours,

f. se f Execut v: Vice MEP/mmf 8102 2 50 Q ~7 R 0 _

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Houston Lighting & Power Company January 7,1981 ST-HL-AE-595 SFN: V-0530 Page 2 cc: J. H. Goldberg D. G. Barker i

Howard Pyle R. L. Waldrop H. R. Dean D. R. Beeth J. D. Parsons G. B. Painter L. K. English A. J. Granger i

R. A. Frazar H. S. Phillips (NRC)

J. O. Read (Read-Poland,Inc.)

- M. D. Schwarz (Baker & Botts)

R. Gordon Gooch (Baker & Botts)

J. R.-Newman (Lowenstein, Newman, Reis, Axelrad & Toll)

Director, Office oof Inspection & Enforcement Nuclear Regulatory Commission Washington, D. C. 20555 f

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January 70 1981 Houston Lighting & Power Compan>

ST-HL-AE-595 SFN: V-0530 Page 3 M. L. Borchelt Executive Vice President Central Power 6 Light Company P. O. Box 2121 Corpus Christi, Texas 78403 R. L. Range

' Central Power 5 Light Company P.13. Box 2121 Corpus Christi, Texas 78403 R. L. Hancock Director of Electrical Utilities

' City of Austin

.P. O. Box 10SS Austin, Texas 78767 TJ H. Muehlenbeck City of' Austin P. O. Box 1088

' Austin, Texas 7S767 J. B. Poston Assistant, General. Manager of Operations City Public Service Board P. O. Box 1771 San Antonio, Texas 78296 A. vonRosenberg City Public Service. Board-P. O. Box 1771 San Antonio, Texas 78296

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' Houston Lighting & Power Compam January 7,1981 ST-HL-AE-595 SFN: V-0530 Page 4 Charles Bechoefer, Esquire Chairman, Atomic Safety & Li:ensing Board U. S. Nuclear Regulatory Commission Washington, D. C. 20cco Dr. Janes C. Lamb, III 313 Woodhaven Road Chapel Hill, North Carolina 27514 Dr. Emmeth A. Luebke Atomic Safety & Licensing Commission U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Citizer: icr Equitable Utilities c/o Mt. Peggy Buchorn Route 1, Box 1684 Brazoria, Texas 77422 Pat Coy Citizens Concerned About Nuclear Power 5106 Casa Oro

-San Antonio, Texas 77422 Betty Wheeler Hoffman, Steeg & Wheeler 1008 S. Madison Amarillo, Texas Brian E. Berwick Assistant Attorney General for the ' State of Texas

. P. O. Box 12548 Capitol Station Austin, Texas 78711 Bernard M. Bordenick Hearing Attorney Office of the Executive Legal Director '

U. S. Nuclear Regulatory Commission Washington, D. C. 20555