ML20031F289
| ML20031F289 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 10/09/1981 |
| 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-736, NUDOCS 8110190491 | |
| Download: ML20031F289 (3) | |
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,P Mr. Karl Seyfrit
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Director, Region IV 3
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Dear Mr. heyfrit:
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South Texts Project Units 1 & 2
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Docket Nos. STN 50-498, STN 50-499 Third Interim Report Concerning Vendor Fabricated Structural Steel On January 8,1981 Houston Lighting & Power Company notified your office in accordance with requirements of 10CFR50.55(e) of an item concerning non-conforming vendor f abricated structural steel. Our third interin report concerning this item is attached. The next interim report will be submitted to your office by March 31, 1982.
If you have any questions, please contact Mr. Michael E. Powell at (713) 676-8592.
Very trul yours, i
f ExecdiveV1.{r!
ea, resident RRH/syt Attachments
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8110190491 011009 PDR ADOCK 05000499
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J. H. Goldberg October 9,1981 J. G. Dewease ST-HL-AE-736 D. G. Barker SFN: V-0530 C. G. Robertson Page two Howard Pyle R. L. Waldrop H. R. Dean D. R. Beeth J. D. Parsons J. W. Williams J. W. Briskin J. E. Geiger STP RMS 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)
Director, Office of Inspection & Enforcement Nuclear Regulatory Commission Washington, D. C. 20555 R. L. Range /G. W. Muench Charles Bechhoefer, Eequire 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. C. Box 1771 University of California San Antonio, Texas 78296 P. O. Box 808, L-46 Livermore, California 94550 Brian E. Berwf.ek, Esquire William S. Jordan, III Assistant Attorney General Harmon & Weiss for the State of Texas 1725 I Streat, N. W.
P. O. Box 12548 Suite 506 Capitol Station Washinton, D. C.
20006 Austin, Texas 78711 Lanny Sinkin Citizens for Equitable Utilities, Inc.
Cit,1: ens Concerned About Nuclear Power c/o Ms. Peggy Buchorn 5106 Casa Oru Route 1, Box 1684 San Antonio, Texas JJ233 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 10-5-81
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l Third Interim Report Concerning Vendor Fabricated Steel October 9, 1981 During the initial re-inspection of vendor fabricated structural steel welds, conducted during the period from December 1980, to June 1981, approximately 625 NCR's were evaluated by Engineering. The identified non-conforming welds were re-inspected on the basis of the American Welding Society (AWS) D1.1 Code. The Engineering evaluation performed on these non-conforming 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 insure that project criteria design allowables were not exceeded. All rework conditions involved undercut or undersized welds, while the bulk of the other NCR's involved cosmetic deviations (such as weld spatter) which do not affect the adequacy of the structural steel to perform its intended design purpose.
As desc lbed in our l' ast report, independent weldiaq consultants have inspet. Led the welds previously identified as not in conformance with the American Welding Society (AWS) D1.1 Code. Based on their observations and expertise, the consultants concluded that the weld acceptance criteria being implemented in the initial re-inspection of vendor fabricated steel by Quality Control (Q/C) personnel were more stringent than the actual Code requirements. Based on the consultants' observations and conclusions, the South Texas Project (STP) interpretation of AWS Code requirements has been re-evaluated and weld acceptance criteria have been revised to more accurately reflect the Code's intent.
Based upon Engineering input, Quality Assurance has issued a procedure for the visual re-examination and acceptance of structural steel welds fabricated by this vendor.
In accordance with this current procedure, minor defects such as weld spatter are considered acceptable since such defects are not of structural significance. Other defects such as undercut and undersize continue to be documented on nonconformance reports (NCR's) since these defects are considered to be of structural significance. All NCR's will continue to be evaluated by Engineering for recomended disposition and evaluation of safety significance.
Following the issuance of the engineering instruction and inspection procedure, a training program was conducted for STP Q/C inspection personnel by an AWS Code committee member. His presentation included an explanation of AWS D1.1 weld acceptance criteria and visual inspection requirements. Also, engineering personnel met with STP Q/C inspection personnel to provide additional guidance and clarification of AWS Code acceptance criteria.
Non-conforming conditions have been dispositioned for rework in order to re-establish design margins or for construction expediency. No weld condition to date has been determined to represent a safety hazard if left uncorrected.
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