ML19296A413
| ML19296A413 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 03/12/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Bryan J UNION ELECTRIC CO. |
| References | |
| NUDOCS 7903190563 | |
| Download: ML19296A413 (1) | |
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WUCLEAR REGULATORY COMMISSION 0
REGION til N
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GLEN ELLYN, ILLINOIS 60137
' 7 m 12.1979 I)ocket No. 50-483 Docket No. 50-486 Union Electric Company ATTN: - Mr. John K. Bryan Vice President - Nuclear P. O. Box 149 St. Louis, MO 63166 Gentlemen:
Enclosed is IE Bulletin No. 79-03, which requires action by you with regard to your power reactor facilities with an operating license or a construction permit.
Should you have any questions regarding this Bulletin or the actions required of you, please contact this office.
Sincerely, James G. Keppler Director
Enclosures:
1.
List of IE Bulletins Issued in Last Twelve Months cc w!encls:
Mr. W. H. Weber, Manager, Nuclear Construction Central Files Director, NRR/DPM Director, NRR/ DOR PDR Iocal PDR NSIC TIC Region I & IV Ms. K. Drey Hon. C. J. Frass, Chairman Missouri Public Service Commission 7903190663 y-
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U.S. NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENTORCEMENT REGION III March 12, 1979 IE Bulletin No. 79-03 14HGITUDINAL WELD DEFECTS IN ASME SA-312 TYPE 304 STAINLESS STEEL FIPE SPOOLS MANUFACWRED BY YOUNGSTOWN WELDING AND ENGINEERING COMPANY Description of Circumstances:
On September 27, 1978, the Arizona Public Service Company reported that defects had been discovered in longitudinal welds in ASME Section III class 2 pipe supplied for the Palo Verde Nuclear Generating Station (PVNGS). On November 17, 1978, the Southern California Edison Company reported similar defects in pipe supplied for the San Onofre Nuclear Generating Station, Units 2 and 3.
Pullman Power Products of Ios Angeles, California supplies safety-related fabricated piping spools of various diameters for the PVNGS.
The defects were discovered by Pullman in ASME SA-312 type 304 stainless steel pipe supplied to Pullman by Youngstown Welding and Engineering Company of Youngstown, Ohio. The pipe is manufactured by rolling plate into cylinders and then fusich welding the longitudinal seam without filler metal.
Pullman discovered defects in the longitudinal welds while radiographing their circumferential shop welds. Further radiographic exselaa:icn of the longitudinal velds revealed rejectable por-sity and la:k af f asi >1.
Pullman then performed ultrasonic examination of the full lengta ci :ne longitudinal welds and discovered indications exceeding the acceptance criteria of ASME Section III. Further ultrasonic examination revealed indications in other piping subassemblies where pipe was supplied by Youngstown. Two indications verified by radiography were identified as porosity and measured 0.350 inch by 0.125 inch in one case and 0.300 inch by 0.125 inch in another case in pipe with a nominal wall thickness of 0.375 inch.
The additions! examinations revealed that of 103 spools and four pipe supports shipped to PVNGS, 44 spools and one pipe support were found to contain ultrasonic indications exceeding those permitted by the ASME Code. Of 65 partially fabricated piping spools, 30 were found to be similarly defective. The acceptance criteria for the pipe supplied by Youngstown includes 100 percent ultrasonic examination of the longitudinal N
osPG 7903160138 1