ML20010H278

Final Deficiency Rept Re Undersized ASME Socket Welds Identified During IE Insp 50-416/80-13,originally Reported on 800718.Constructor Welding QC Engineers Reinstructed Re Min Fillet Sizes for Sockets & Flanges

ML20010H278
Person / Time
Site:	Grand Gulf
Issue date:	09/16/1981
From:	Mcgaughy J MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
10CFR-050.55E, 10CFR-50.55E, AECM-81-323, NUDOCS 8109240293
Download: ML20010H278 (5)

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f l MISSISSIPPI POWER &

i N GHT COMPANY Helping Build Mississippi ,

P. O. B O X 164 0. J ACK S O N, MIS SIS SIP PI 3 9 2 05 l I ," " n {>, ,

1. UsIs$rN0s7eM" September 16,bO81 Office of luspection & Enforcement , y

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U. S. Nuclear Regulatory Com ission > g g Region II ty 9, to g -

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101 Marietta Street, N.W. <

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Suite 3100 Atlanta, Georgia 30303 r%

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'.f Attention: Mr. J. P. O'Reilly, Director 7'

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Dear Mr. O'Reilly:

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SUBJECT:

G'and r Gulf Nuclear Station Units 1 and 2 Docket Nos. 50-416/417 File 0260/15525/15526

, PRD-80/43, Final Report Undersized Socket Uelds AECM-81/323

References:

1) PRD-80/4.,

a) AECM-81/58, 2/4/81 b) AECM-80/190, 8/15/80

2) IE Inspection 50-416/80-13 a) AECM-80/201, 8/29/80 On July 18, 1980, Mississippi Power & Light Company notified Mr. F.

Cantrell, of your office, of a Potentially Reportable Deficiency (PRD) at the Grand Gulf Nuclear Station (GGNS) construction site. The deficiency concerns ASME III socket welds which were identified during IE Inspection 50-416/80-13.

Our investigation has shown that thic deficiency is generic in nature and is reportable under 10CFR50.55(e). It ia'not reportable under 10CFR21 as explained in the attached final report.

Yours truly, y J. P. McGaughy, Jr.

KDS:dr ATTACHMENT 77 cc: See page 2 5

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/ II 8109240293 810916 Member Middle South Utilities Systein PDR ADOCK 05000416PDR g

~Mr. J. P. O'Reilly AECM-81/323 NRC Page 2 cc: Mr. N. L. Stampley Mr. R. B. McGehee Mr. T. B. Conner Mr. Victor Stello, Direc*.or Office of Inspection & Enforcement U. S. Nucl'.2r Regulatory Commission Washington, D.C. 20555 Mr. G. B. Taylor .

South Miss. Electric Power Association P. O. Box 1589 Rattiesburg, MS 39401 ,

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Abe: Mr. D. C. Lutken Mr. J. Leatherman Dr. D. C. Gibbs Manager of BWR-6 Licen . .g Mr. J. N. Ward General Electric Com . .y .

Mr. J. P. McGaughy, Jr. 175 Curtner Avente Mr. J. D. Heaton San Jose, CA. 9' . 5 Mr. R. Trickovic y

Mr. J. W. Yelverton ,

Mr. L. P. Dale Mr. D. M. Houston Mr._ C. K. McCoy U. S. Nuclear Regulatory Commission Mr. T. H. Cloninger Division of Licensing Mr. R. A. Ambrosino Washington, D. C. 20555 Mr. A. J. Iosue Mr. G. B. Rogers Mr. S. H. Hobbs

Mr. J. Matore Mr. L. E. Ruhland U. S. Nuclear Regulatory Commission Mr. D. L. Hunt Division of Licensing Mr. A. G. "agner  ! Washington, D. C. 20555 Mr. P. A. Taylor-PRD File File s

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.a Attachment to AECM-81/323 Pags I af 2 FINAL REPORT FOR PRD-80/43 I. Description of the Deficiency A generic problem with the leg size of int.rslled fillet and socket welds was discovered on the GGNS jobsite. It affect all piping systems, supports, and structural steel installations previously installed in both Unit 1 and Unit 2.

This deficiency does not affect the NSSS vendor.

II. Analysis of Safety Implication To determine the extent of the condition, our Constructor initiated an investi-gation. A total of five hundred thirteen (513) socket welds were reinspected.

Fifty three (53) of these welds were identified as being in noncompliance with the applicable ASME Code. Evaluation by our Architect / Engineer showed that although the welds in question were in noncompliance to the ASME code minimum size criteria, all welds were structurally adequate. Although failure of the welds in the original sample would not have. adversely affected the safety of operations of the nuclear power plant, the deficiency is reportable under 10CFR50.55(e) since an extensive evaluation would be required to establish the adequacy of all the welds to perform their intended safety function.

In the course of our investigation it was decided that structural welds should be considered also. A random selection of typical structural fillet welds was evaluated. No unacceptable conditions were found.

The deficiency is not reportable under 10CFR21 because the affected components had not been turned over to MP&L.

t III. Corrective Actions Taken i The cause of the deficiency was the' utilization by our Constructor of the practice o,f visually inspecting fillet welds and measuring with a fillet gauge at several points along the length of the weld and where the weld size appeared to be borderline.

The deficiency is generic and affects all piping systems, supports, and struc-tural steel installations.

All accessible Q ASME III socket welds which had been accepted by our Coratructor prior to August 11, 1980, were reinspected. Those which did not pass the inspection were dispositioned to be used "as is or were reworked as necessary. All rework on Unit I has been completed. Work on Unit 2 will be completed prior to fuel load.

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Attachment to AECM-81/323 P:gs 2 of 2 Several hundred of the welds in question were inaccessible and could not be reinspected. These welds care embedded in concrete, were inside piping or other equipment, or were underground. All of these welds were dispoJitioned*ro be uscd "as is" because of known external design loading or because they had previously passed hydro tests.

To preclude recurrence of the deficiency our Constructor issued the welders a chart which identifies the minimum fillet weld sizes for sockets and flanges.

All active pipefitter welders have been instructed regarding the mimimum requirements for fillet weid sizes for sockets and flanges. Our Constructor also issued Information Bulletin W-038 to all active pipefitter welders. Each person signed a signature sheet signifying they had read and understood the contents of this bulletin. This trainir.g was conducted by Welding Engineering.

Information Bulletin W-038 will be incarporated into Revision 2 of Construction Work Plan Procedure WP/P-28, Appendix B. For the interim.. change request No.

248 to WP/P-28, Revision 1, was generated to; incorporate W-038.

All welders currently working for our Constructor who weld on safety-related equipment and sttuctures, were issued a fillet weld gauge and instructed in its proper use. Our Constructor's welding Quali.ty Control (QC) engineers have been reinstructed regarding minimum fillet sizes for sockets and flanges and proper use of fillet w'1d gauges. There is increased monitoring of in-process socket welding by our Constructor's QC engineers. This will allow QC to detect and possibly prevent any potential problem which may occur. The welding Quality Control engineers will be readily available to assist welders regarding minimum fillet sizes and proper use of fillet gages.

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