ML19351F908

Second Interim Deficiency Rept Re Reactor Containment Bldg Structural Steel Beam to Column Connection Design,Initially Reported on 800924.Design,checking of Design & Detailing of Const Drawings Are in Progress.Next Rept Provided by 810901

ML19351F908
Person / Time
Site:	South Texas
Issue date:	02/12/1981
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-620, NUDOCS 8102200463
Download: ML19351F908 (5)

Text

The Light Company sousion tigating & romer e.o. nex ivoo nouston. Texas 77ooi (7i33 22s.92ii

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February 12, 1981 ST-HL-AE-620 SFN: V-0530 Mr. Karl Seyfrit Director, Region IV Nuclear Regulatorj' Comission 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76012

Dear Mr. Seyfrit:

South Texas Project Units 1&2 Docket Nos. STN 50-498, STN 50-499 Second Interim Report Concerning Beam to Column Connection Desicn in the Reactor Containment Building On September 24, 1980, pursuant to 10CFR50.55(e), Houston Lighting &

Power Company notified your office of an item concerning the Reactor Contain-ment Building (RCB) Structural Steel Beam to Column Connection Design. A description of the incident, corrective measure, and safety evaluation were provided in the first interim report.

The re-verification activities are in various stages of completion based upon building floor elevations. To date, the analysis has been ccmpleted for all floors. However, the design, checking of the design and detailing of con-struction drawings are still in progress.

In general, the results of the effort indicate the following:

(1) For steel floors, structural modifications will be made such as replacing certain connections with expansion joints to account for themal loads and increasing the structural strength of other connections to account for seismic and pres-sure loads.

(2) Cover plstes will be added to a few beams to improve resistance to axial loads or loads applied in the direction of the weak axis.

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1 Houston Ughting & Power Company February 12,1981 ST-HL-AE-620 SFN: V-0530 Page 2 i

The next report concerning this item will be submitted to your office by September 1,1981.

If there are any questions concerning this iter, please contact Mr. Michael E. Powell at (713) 676-8592.

Very truly yours, b.

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cf G. W. Oprea, Jr.

Executive Vice President i

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Houston lighting' & Power Company February 12, 1981 ST-HL-AE-620 SFN: V-0530 Page 3 cc:

J. H. Goldberg D. G. Barker Howard Pyle R. L. Waldrcp H. R. Cean D. R. Beeth J. D. Parsons G. B. Painter L. K. English A. J. Granger R. A. Frazar H. S. Phillips (NRC)

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

M. D. Schwar:

(Baker & Botts)

R. Gordon Gooch (Baker & Botts)

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

Director, Office of Inspection & Enforcement Nuclear Regulatory Commission Washington, D. C. 20555 r

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Houdon Lighdng & Power Company February 12, 1981 ST-HL-AE-620 SFN: V-0530 Page 4 M. L. Borchelt Executive Vice President Central Power & Light Company P. O. Box 2121 Corpus Christi, Texas 78403 R. L. Range Central Power & Light,ompany P. O. Box 2121 Corpus Christi, Texas 78403 R. L. Hancock Director of Electrical Utilities City of Austin P. O. Box 1088 Austin, Texas 78767 T. H. Muthlenbeck City of Austin P. O. Box 1088 Austin, Texas 78767 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 l

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, Houston 1.ighting & Power Corapany February 12,1981 ST-HL-AE-620 SFN: V-0530 Page 5 Charles Bechaefer, Esquire Chainnan, Atcmic Safety & Licensing Board U. S. Nuclear Regulatory Connission Washington, D. C. 20555 Dr. James C. Lamb, III 313 Woodhaven Road Chapel Hill, North Carolina 27514 Dr. Enneth A. Luebke Atcmic Safety & Licensing Ccanission U. S. Nuclear Regulatory Comission Washington, D. C.

20555 Citizens for Equitable Uti'ities c/o Ms. Peggy Buckorn Route 1, Box 1654 Brazoria, Texas 77422 Pat Coy Citizens Concerned About Nuclear Pcwer 5106 Casa Oro San Antcnic, Texas 77422 Betty Wheeler i

Hoffman, Steeg & Wheeler 1008 S. Madison Anarillo, Texas Brian E. Bemick Assistant Attorney General for the State of Texas l

P. O. Box 12548 Capitol Station Austin, Texas 78711 Bernard M. Bordenick Hoaring Attorney l

Office cf the Executive Legal Director U. S. Nuclear Regulatory Comission i

Washington, D. C. 20555 l

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