ML20009F408

Final Deficiency Rept Re Defects in Nuclear Designated Structural Steel Supplied by Mills Alloys.Supplier Found Matl Acceptable Under Provisions of ASTM A6.Condition Not Reportable Per 10CFR50.55e or 10CFR21

ML20009F408
Person / Time
Site:	Grand Gulf
Issue date:	06/29/1981
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-81-227, NUDOCS 8107310113
Download: ML20009F408 (4)

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MISSISSIPPI POWER & LIGHT . COMPANY

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At tent.'.o n: Mr. J. P. O'Reilly, Director ,

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SUBJECT:

Grand Gulf Nuclear Station Units 1 and 2 Docket Nos. 50-416/417 File 0260/15525/15526 PRD-80/75, Final Report Defects in Structural Steel AECM-81/227 On December 30, 1980, Mississippi Power & Light Company notified Mr. J.

Rausch, of your office, of a Potentially Reportable Deficiency (PRD) at the Grand Gulf Nuclear Station (GGNS) construction site. The deficiency concerns imperfections in nuclear designated structural steel supplied by Mills Alloys located in Cleveland, Ohio.

We have determined this deficiency is not reportable within the meaning of either 10CFR50.55(e) or 10CFR21. Attached is our final report.

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ATR:dr ATTACHMENT cc: See page 2 f

hI I 8107310113 810629 L PDR ADOCK 05000 S

Member Middle South Utilities System

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l Mr. J. P. O'Reilly AECM-81/227 NRC Page 2 cc: Mr. N. L. Stampley Mr. R. B. McGehee Mr. T. B. Conner Mr. Victor Stello, Director Office of Inspection & Enforcement U. S. Nuclest Regulatory Commission  ;

Washington, D.C. 20555 Mr. G. B. Taylor South Miss. Electric Power Association P. O. Box 1589 Hattiesburg, MS 39401 i

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. e, bec: Dr. D. C. Gibbs Mr. D. C. Lutken s

! Mr. J. N. Ward l Mr. W. A. Braun Mr. R. Trickovic I

Mr. J. W. Yelverton Mr. L. F. Dale i Mr. C. K. McCoy Mr. T. H. Cloninger Mr. R. A. Ambrosino J

Mr. R. C. Fron Mr. G. B. Rogers Mr. M. R. Williams i Mr. L. E. Ruhland Mr. D. L. Hunt Mr. A. G. Wagner Mr. P. A. Taylor PRD File i File f

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e Attrchment to AECM-81/227

• Pcg3 1 of 1 FINAL REPORT FOR PRD-80/75 I. Descriptior of Deficiency A. Longitudinal indications in the form of cracks / tears have been found on structural steel wide flange beams (WF 12/136). The web of the beams shows imperfections from 1/2"-12" long and 1/32"-1/8" deep.

B. These indications are identified on WF 12/136 steel heat #73E230 (USS),

70A010 (USS), 72A193 (USS) purchased from Mills Alloy and manufactured by U. S. Steel.

II. Analysis of Safety Implications A. The indications in the structural steel occur during the normal manu-facturing process of steel shapes since the rolling of structural shapes is from ingot to final form with no intermediate conditioning. Material specification ASTM A-6 allows for certain of these imperfections with provisions and guidelines for conditioning or repairing.

B. The cited condition (s) were evaluated by the manufacturer and our Architect / Engineer and it was determined that the structural integrity of the beams was not af fected. Therefore, the cited deficiencies would not have affected the safe operation of the plant.

III. Corrective Actions Taken A. The cause of the deficiency is described in Item IIA. The extent of the deficiency is limited to the heats identified in Item IB.

B. The defective steel was returned to the supplier for an evaluation to determine the af feet on structural integrity. Mills Alloy and United States Steel (USS) stated in their responses that the material was accept-able under the provisions of ASTM A6, and the structural integrity was not affecte.d. Our Architect / Engineer has requested that Mills Alloy condition the subject steel in accordance with material specification ASTM A6 and reship.

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