ML19330C753

Interim Deficiency Rept Re Polar Crane Rail Tie Down Stds. Brown & Root Review Showed Failures Not Caused by Inadequate Design.Deviation from Design Alignment Observed in as-built Curvature of Rails.Next Rept Will Be Submitted 800917

ML19330C753
Person / Time
Site:	South Texas
Issue date:	08/01/1980
From:	Oprea G HOUSTON LIGHTING & POWER CO.
To:
References
ST-HL-AE-503, NUDOCS 8008110424
Download: ML19330C753 (4)

Text

_

a w Tmne Lignt CCmpany Hwstm UghnngHe m hxIm Haste,Lxasm01 A3m8MH August 1, 1980 ST-HL-AE-503 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 Project Units 1&2 Docket Nos. STN 50-498, STN 50-499 Third Interim Report on the Reportable Deficiency Concerning the Polar Crane Rail Tie Down Studs On March 20, 1980, pursuant to 10CFR50.55(e), Houston Lighting & Power notified your office of a reportable deficiency concerning broken tie-down studs in the Reactor Containment Building Unit 1 polar crane rail system. As indicated in the second interim report (ST-HL-AE-484), Houston Lighting & Power has directed Brown & Root Engineering to further evaluate the as-built conditions for the polar crane rail system and the crane operation to determine if any other causes contri-buted to the stud failures.

Brown & Root is continuing to evaluate the as-built conditions and the polar crane operation at this time; however, the following preliminary observations have been made,

a. Based on a thorough review of the crane rail system calculations, it is believed that the stud failures were not caused by inadequate design.

b. Deviations from the design alignment have been observed in the as-built curvature of the rails.

c. Rail splice locations in some instances were observed to be close to the rail tie-down clip system. Surface evidence of contact has been noted where splice bolts have hit the tie-down studs,

d. The wear pattern observed on the crane wheels has been discur. sed with the manufacturer. The crane mechanical system will be evaluated when the polar crane is operational. 3o/9 5

///

8008110 @ Y 8

Ikwston tghting & her company August 1, 1980 ST-HL-AE-503 SFN: V-0530 Page 2 The next interim report for this deficiency will be submitted to your office on September 17, 1980.

Further questions should be directed to Mr. Shawn Rodgers at (713) 676-Very truly yours,

,'Q

. re , r.

Exe ive 'ce President BPW/pjb l

B 1 .

l

Houston trfung & Tbur company ST-HL-AE-503 SFN: V-0530 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. Borchelt Executive Vice President Central Power & Light Company P. O. Box 2121 Corpus Christi, Texas 78403 R. L. Range Central Power & Light Company P. O. 2121 Corpus Christi, Texas 78403 R. L. Hancock Director of Electric 1 Utilities City of Austin P. O. Box 1088 Austin, Texas 78767 T. H. Moehlenbeck l City of Austin l P. O. Box 1088 Austin, Texas 78767 J. B. Poston Assistant General Manager of Operatio.ns City Public 5ervice Board P. O. Box 1771 San Antonio, Texas 78296 A. vonRosenberg -

City Public Service Board P. O. Box 1771 San Antonio, Texas 78296 l

l

lWston tshting, t. w company ST-HL-AE- 503 .

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 Commission U.S. Nuclear Regulatory Commission Washington, D.C.20555 Steven A. Sinkin, Esquire 116 V1111ta 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 Commission Washington, D.C. 20555 O

f e

- - - - - , . , , . , . - . ~ _ . , _ . _ - , . _ _ . , , , . , _ . . , - . -. - - ~ . , , -

y- , -.,. , _ ,,.__, .--,- ,