ML19318C017

Interim Deficiency Rept Re Seismic Qualification of Essential Cooling Water Intake Structure Gantry Crane & Diesel Generator Fuel Oil Storage Tank.Preliminary Findings Show Designs Sufficiently Conservative.Mods Not Expected

ML19318C017
Person / Time
Site:	South Texas
Issue date:	06/26/1980
From:	Oprea G HOUSTON LIGHTING & POWER CO.
To:
References
ST-HL-AE-485, NUDOCS 8006300435
Download: ML19318C017 (2)

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The Light NE bN Houston Lighting & Power RO. Box 1700 Houston, Texas 77001 (713) 228-9211 l

June 26,1980 ST-HL-AE-485 SFN: V-0530 Mr. Karl Seyfrit Director, Region IV Nuclear Regulatory Commission  ;

611 Ryan Plaza Drive, Suite 1000 '

Arlington, Texas 76102

Dear Mr. Seyfrit:

South Texas ProjeG Units 1 & 2 Docket Nos. STN 50-498, STN 50-499 Interim Report on the Deficiency Concerning the ECW Gantry Crane Seismic Analysis On May 29,1980, Houston Lighting & Power Company notified your office of a potentially reportable deficiency concerning seismic qualification of the Essential Cooling Water Intake Structure (ECWIS) gantry crane and the Diesel Generator Fuel Oil Storage Tank. The Safe Shutdown Earthquake (SSE) response spectra values used in designing the two components were detennined by mul-tiplying the Operat*ng Basis Earthquake (0BE) values by 1.5 ( as stated in the crane specification) rather than by a factor of 2.0. The factor of 2.0 should have been used in order to envelop the actual required SSE response spectra.

This concern was first identified during a review of the design of the ECWIS gantry crane. A subsequent check of other mechanical specifications reve61td a similar situation with the standby diesel generator fuel oil storage tank in the diesel generator building.

New seismic calculations for the gantry crane and the storage tank which will incorporate the 2.0 factor are currently in progress. How-ever, preliminary indications are that the designs of both components are sufficiently conservative since they anticipate load combinations more severe in impact than expected seismic loads. Consequently, modifications are not anticipated. Any additional information resulting from these calculations should be available to HL&P by mid-September,1980. Additionally, HL&P and B&R are soliciting inquiries from reputable consulting firms to Sool S

80063004.55 3 /D

Houston Lighting & Pov er Company June 26, 1980 ST-HL-AE-485 SFN: V-0530 Page 2 investigate and evaluate the seismic qualifications of equipment to be used at STP.

The next. report on this potentially reportable deficiency will be sub-mitted to the NRC by October 1,1980. Any questions on this item should be directed to Mr. Shawn Rodgers, (713) 676-7953.

Very truly yours, G. W. Oprea, Jr.

Executive Vice President PLW/pjb

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Hoi $ ton Lghting & T' owr Compary ST-HL-AE- 485 Page 3 cc: D. G. Barker C. L. McNeese H. R. Dean R. L. Waldrop G. B. Painter A. J. Granger R. A. Frazar M. D. Schwarz (Baker & Botts)

R. Gordon Gooch (Baker & Botts)

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

Director, Office of Inspection & Enforcement Nuclear Regulatory Commission Washington, D.C. 20555 M. L. Bo:chelt Executive Vice President Central Power & Light Company P. O. Box 2121 Corpus Christi, Texas 78403 R. L. Range Central Power & Light Company 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 M. C. Nitcholas ,

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 l San Antonio, Texas 78296 l

M Uhhting & Power Company ST-HL-AE- 485 Page 4 Charles Bechoefer, Esquire Chairman, Atomic Safety & Licensing Board U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Dr. James C. Lamb, III 313 Woodhaven Road Chapel Hill, North Carolina 27514 Dr. Emmeth A. Luebke Atomic Safety & Licensing Conmission U.S. Nuclear Regulatory Conmission Washington, D.C.20555 Steven A. Sinkin, Esquire 116 Villita Street San Antonio, Texas 78205 Citizens for Equitable Utilities c/o Ms. Peggy Buchorn Route 1 Box 432 Brazoria, Texas 77422 Richard W. Lowerre, Esquire Assistant Attorney General for the State of Texas P. O. Box 12548 Capitol Station Austin, Texas 78711 Henry J. McGurren, Esquire Hearing Attorney Office of the Executive Legal Director U.S. Nuclear Regulatory Conmission Washington, D.C. 20555 l