ML20071J804
| ML20071J804 | |
| Person / Time | |
|---|---|
| Site: | Waterford  |
| Issue date: | 04/19/1982 |
| From: | Mclendon G LOUISIANA POWER & LIGHT CO. |
| To: | Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, WSK-82-0239, WSK-82-239, NUDOCS 8204270377 | |
| Download: ML20071J804 (3) | |
Text
O LOUISIANA f 242 OuAnOsOc sinta POWE R S LIG HT/ P O BOX 6008
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's$s SvsYtY) u April 19, 1982 G. D. McLENDON Senior Vce President W3K-82-0239 Q-3-A35.07.28 Mr. John T. Collins, Regional Administrator, Region IV hhh/[kfh U. S. Nuclear Regulatory Commission
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SUBJECT:
Waterford SES Unit No. 3 Docket No. 50-382 Final Report of Significant Construction Deficiency No. 28 Two-Inch and Below behedule 160 Socket Welds Undersize
Reference:
LP&L Letter W3K-82-0136 dated March 5, 1982 to USNRC
Dear Mr. Collins:
In accordance with the requirements of 10CFR50.55(e), we are hereby providing two copies of the Final Report of Significant Construction Deficiency No. 28, "Two-Inch and Below Echedule 160 Socket Welds Undersize."
If you have any questions, please advise.
Very truly yours,
- d. M A GDMcL/LLB/grf w
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April 19, 1982 G. D. McLENDON Senior Yce President W3K-82-0239 Q-3-A35.07.28 Mr. John T. Collins, Regional Administrator, Region IV hhe,hV/Qf U. S. Nuclear Regulatory Commission p
611 Ryan Plaza Drive, Suite 1000 j
Arlington, Texas 76012 M 2 l IE l
SUBJECT:
Waterford SES Unit No. 3
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gl Docket No. 50-382 Final Report of Significant Construction Deficiency No. 28 Two-Inch and Below Schedule 160 Socket Welds Undersize
Reference:
LP&L Letter W3K-82-0136 dated March 5, 1982 to USNRC
Dear Mr. Collins:
In accordance with the requirements of 10CFR50.55(e), we are hereby providing two copies of the Final Report of Significant Construction Deficiency No. 28, "Two-Inch and Below Schedule 160 Socket Welds Undersize."
If you have any questions, please advise.
Very truly yours, GDMcL/LLB/grf
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cc: 1) Director RECEIVED Office of Inspection & Enforcement
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U. S. Nuclear Regulatory Commission a-APR 271982, [8 Washington, D. C. 20555
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(with 15 copies of report)
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- 2) Director t
D Office of Management t 3 Information and Program Control U. S. Nuclear Regulatory Commission (with 1 copy of report)
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o' LOUISIANA POWER & LIGHT COMPANY WATERFORD SES UNIT NO. 3 Final Report of I
Significant Construction Deficiency No. 28 Two-Inch and Below Schedule 160 Socket Welds Undersize I / /2J Reviewed by
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R. f. Vil{iser - Site Manager
'Date Reviewed by J.*Will - Project Superintendent (Date' Reviewed by
_bA h'/bbd J. Hart - P ject Licensing En'gi#eer Date Reviewed by s a.*_ d 8/ 6 L
J. DeBruitt/- ESSR Tro'jgt gifigined Ifate Reviewed by d
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Gutierrez - Q. A.
e Supervisor Dits April 14, 1982 i
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.n FINAL REPORT SIGNIFICANT CONSTRUCTION DEFICIENCY NO. 28 TWO-INCH AND BELOW SCHEDULE 160 SOCKET WELDS UNDERSIZE Introduction This report is submitted pursuant to 10CFR50.55(e).
It describes a welding deficiency identified in ASNE Subsections NB, NC and ND Socket Welds. This problem is considered reportable under the requirements of 10CFR50.55(e).
To the best of our knowledge, this problem has not been identified to the Nuclear Regulatory Commission pursuant to 10CFR21.
Description A sample of 2" Schedule 160 socket welds made by Tompkins-Beckwith was rein-spected during the fall of 1980 following a report of problems at another facility and Ebasco Quality Assurance Surveillance Report SRW-80-8-2.
This inspection and others made subsequently disclosed that a significant number of the 2" Schedule 160 socket welds were in the \\" to 5/16" range rather than 3/8" as required by Code criteria.(ASME Section III, Subsections NB, NC and ND). An Interim Report dated May 4,1981 submitted by Louisiana Power &
Light Company to the U. S. Nuclear Regulatory Commission stated that approxi-mately 1600 2" Schedule 160 socket welds were affected.
In response to the above Ebasco Quality Assurance Surveillance Report, Tompkins-Beckwith committed to corrective action which would reduce the number of welds requiring reinspection from 1601 to 801. Of the 801 welds, 394 were identified by Tompkins-Beckwith as requiring additional weld metal.
Corrective action on these 394 welds is complete and has been verified by Ebasco. Due to questions raised by an Ebasco sampling inspection of welds designated acceptable by Tompkins-Beckwith, the remaining 407 welds, plus the 800 welds previously eliminated as not requiring reinspection, were all reinspected.
Later, 1044 additional socket welds comprised of 261 2" and 783 under 2" were reinspected.
In all, a total of 2645 2" and under socket welds were reinspected.
Safety Implications These welds were significantly below the size required by the ASME Code which reduced the safety margin of the original design considerably.
Thus, the possibility existed that these socket welds could fail during plant operation.
Corrective Action l
A total of 2645 2" and under Schedule 160 socket welds were reinspected by l
Tompkins-Beckwith.
In all, 794 of 1862 2" socket welds and 460 of 783 under i
2" socket welds required additional weld metal. Corrective action was completed l
and verified by Ebasco on April 15, 1982.
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