ML20003B445

Interim Deficiency Rept 1,originally Reported 800718,re Undersized Fillet & ASME III Socket Welds.Reinsp of Socket Welds Found 53 of 513 Welds in Noncompliance.Ae Evaluating Weld Samples.Final Rept Will Be Submitted by 810909

ML20003B445
Person / Time
Site:	Grand Gulf
Issue date:	02/04/1981
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-80-190, AECM-81-58, NUDOCS 8102120052
Download: ML20003B445 (3)

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MISSISSIPPI POWER & LlGHT COMPANY Helping Build Mississippi P. O. B O X 1640. J AC K S O N, MIS SIS SIP PI 3 9 2 0 5 JAMES P Mc3AUGHY, JR.

A&&lsTANT vfCE P*ESIDENT February 4, 1981 Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, N.W.

Suite 3100 Atlanta, Georgia 30303 Attention: Mr. J. P. O'Reilly, Director

SUBJECT:

Grand Gulf Nuclear Station Units 1 and 2 Docket Nos. 50-416/417 File 0260/15525/15526 PRD-80/43, Interim Report No. 1, Undersized Socket Welds AECM-81/58

Reference:

AECM-80/190, 8/15/80 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 Inspec-tion 50-416/80-13.

Due to the depth of the required inspections, our investigation is not complete. We have, however, determined this deficiency to be re-portable under 10CFR50.55(e) for the reasons noted in the attached report. A final determination of reportability under 10CFR Part 21 has not been made. We expect to complete our investigations and corrective actions and submit a final report by September 9, 1981.

Yours truly, J. P. McGaughy, Jr.

CWH:mt Attachment cc: See page 2 Qf w '

810212005A -

Member Middle South Utilities System

MISSISSIPPI POWER & LIGHT COMPANY Mr. J. P. O'Reilly AECM-81/58 NRC Page 2 cc: Mr. N. L. Starpley Mr. R. B. McGehee Mr. T. B. Conner Mr. Victor Stello, Director Div. of Inspection & Enforcement U. S. Nuclear Regulatory Comission Washington, D.C. 20555 Mr. G. B. Taylor South Miss. Electric Power Association P. O. Box 1589 Hattiesburg, MS 39401

Attachmint to AECM-81/58 Page 1 of 1 INTERIM REPORT PRD-80/43 I. Description of Deficiency A generic problem with the leg size of installed fillet and socket welds was discovered on the GGNS jobsite. This problem is common to both Units 1 and 2 safety related systems.

To determine the extent of the condition, the Constructor initiated an investigation. A total of five hundred and thirteen (513) ASME Section III socket welds were reinspected and fifty three (53) of these welds were identified as being in noncompliance with the ASME Code. Calculations by our Architect / Engineer show that, although the welds in question were in noncompliance to tha ASME code min-imum size criteria, all welds were structurally adequate.

Although there would have been no impact on the safe operation of the power plant over its expected lifetime, caused by the welds in i

the original sample, the generic discrepancy is considered reportable under 10CFR50.55(e) (1) (i) & (111) .

II. Approach to Resolution of the Problem / Status of Approach

1. Due to the large number of rejects in the original sample of 513 welds, reinspection of all accessible "Q"/ASME III Class 1, 2, and 3 socket welds, and re-evaluation of welds on safety related supports is being performed. Unaccessible welds have been documented on nonconformance documents and are being evaluated by Architect / Engineer for required actions.

2. The Architect / Engineer is also evaluating a sampling of fillet type welds (other than ASME Section III and welds on safety related supports) to determine what actions may be required.

The investigation on hanger fillet welds is being tracked by the Constructor's Management Corrective Action Report CMCAR)-

66.

3. All involved welders /pipefitters/ welding QC Engineers have been instructed on minimum requirements for weld sizes.

4. A bulletin on proper weld sizes has been incorporated into the work plan / procedure.

III. Reasons for Delay in Final Report Constructors / Architect / Engineer's investigations are still in progress. MCAR-95 tracks the corrective actions.

IV. Projected Date for Final Report We project completion of all corrective actions and submission of our final report by September 9, 1981.

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