ML20050C269
| ML20050C269 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 03/30/1982 |
| From: | Oprea G HOUSTON LIGHTING & POWER CO. |
| To: | Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, ST-HL-AE-811, NUDOCS 8204080356 | |
| Download: ML20050C269 (3) | |
Text
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The Light mmPuy i e s,e i.is i s & re e, iso. isex ivoo e.s,e. rex s 77ooi <7is> 228 92ii n
March 30, 1982 ST-HL-AE-811 SFN: V-0530 Mr. John T. Collins Regional Administrator, Region IV
- E Nuclear Regulatory Commission M 3 I IE 1
611 Ryan Plcia Dr., Suite 1000 il i
Arlington, Texas 76012 M
Dear Mr. Collins:
South Texas Project Units 1 & 2 Docket Nos. STN 50-498, STN 50-499 Fourth Interim Report Concerning Vendor Fabricated Structural Steel On January 8,1981, Houston Lighting & Power Company (HL&P), pursuant to 10CFR50.55(e), notified your office of an item concerning nonconformances of welds in vendor fabricated Category I structural steel.
Our fourth interim report concerning this item is attached. The next report will be submitted to your office by October 15, 1982.
If you should have any questions concerning this matter, please contact Mr. Michael E. Powell at (713) 877-3281.
Very truly yours,
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0204080356 820330
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PDR ADOCK 0500049s 6
Ilouston Lighting & Power Corniany cc:
G. W. Oprea, Jr.
J. H. Goldberg ST-HL-AE-811 J. G. Dewease.
SFN: V-0530 J. D. Parsons Page 2 D. G. Barker C. G. Robertson R. A. Frazar J. W. Williams J. W. Briskin J. E. Geiger R. L. Ulrey S. M. Dew J. T. Collins (NRC)
D. E. Sells (NRC)
W. M. Hill, Jr.
(NRC)
M. D. Schwarz (Baker &Botts)
R. Gordon Gooch (Baker &Botts)
J. R. Newman (Lowenstein, Newman, Reis, & Axelrad)
STP RMS Director, Office of Inspection & Enforcement Nuclear Regulatory Commission Washington, D. C. 20555 R. L. Range /G. W. Muench Charles Bechhoefer, Esquire Central Power & Light Company Chairman, Atomic Safety & Licensing Board P. O. Box 2121 U. S. Nuclear Regulatory Commission Corpus Christi, Texas 78403 Washington, D. C.
20555 R. L. Hancock/G. Pokorny Dr. James C. Lamb, III City of Austin 313 Woodhaven Road P. O. Box 1088 Chapel Hill, North Carolina 27514 Austin, Texas 78767 J. B. Poston/A. vonRosenberg Mr. Ernest E. Hill City Public Service Board Lawrence Livermore Laboratory P. O. Box 1771 University of California San Antonio, Texas 78296 P. O. Box 808, L-46 Livermore, California 94550 Brian E. Berwick, Esquire Wi'i iam S. Jordan, III l
Assistant Attorney General Harn in & Weiss for the State of Texas 1725 I Street, N. W.
P. O. Box 12548 Suite 506 Capitol Station Washington, D. C.
20006 Austin, Texas 78711 Lanny Sinkin Citizens for Equitable Utilities, Inc.
Citizens Concerned About Nuclear Power c/o Ms. Peggy Buchorn 5106 Casa Oro Route 1, Box 1684 San Antonio, Texas 78233 Brazoria, Texas 77422 Jay Gutierrez Esquire Hearing Attorney Office of the Executive Legal Director U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Revision Date 2-22-82
3 FOURTH INTERIM REPORT CONCERNING VENDOR FABRICATED STEEL
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As previously noted in the third interim report, the initial re-inspection of vendor fabricated structural steel welds, conducted during the period from December 1980 to June 1981, yielded approximately 625 nonconformance reports (NCR's) which were evaluated by Brown & Root Engineering. The evaluation per-formed on these nonconforming welds determined that in each case the weld, if left ' uncorrected, would not have created a safety hazard. Approximately ten (10) percent required rework to ensure either that project criteria design allowables were not exceeded, or that construction schedule needs were met.
Based on the consultants' observations and conclusions, as discussed in the last report, the South Texas Project (STP) interpretation of AWS Code re-quirements has been re-evaluated and weld acceptance criteria have been revised in project inspection procedures to more accurately reflect the Code's intent.
Since that report, acceptance criteria for undercut were revised from AWS D1.1-1975 to AWS D1.1-1981 in project specifications and changed in Amendment 21 to the FSAR, dated December 4,1981. Also, a more realistic, yet conserva-tive, approach was developed for evaluating the NCR's. Hand calculations were carried out in conjunctio1 with the development of a computer program for cal-culation of a conservative ss built weldment stress.
During the period from June to September 1981, approximately 1,000 beams and column members were re-examined utilizing revised inspection guidelines.
Using the more realistic approach described above, evaluation of the NCR's resulting from this re-examination has shown a rework rate of approximately 1%.
Non-conforming conditions during this re-examination have been dispositioned for rework in order to re-establish design margins. To date, no weld condition has been determined to represent a safety hazard if left uncorrected.
Since September, the remaining planned re-examinations have beer con-cluded and disposition of the resulting NCR's is continuing at this time.
Required welding rework will be initiated upon resumption of safety-related welding in the field. Bechtel Power Corporation (BPC) will review the program and results and provide its recomendations prior to closure of this item.