ML19254E282
| ML19254E282 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 10/19/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Bryan J UNION ELECTRIC CO. |
| References | |
| NUDOCS 7910310413 | |
| Download: ML19254E282 (1) | |
Text
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'o UNITED STATES
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REGION lil r
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GLEN ELLYN. ILLINOIS 60137 OCT 191979 Docket 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:
The enclosed Bulletin 79-13, Revision 2 is forwarded to you for information. No written response is required.
If you desire additional information regarding this matter, please contact this office.
Sincerely, N'
James G. Keppler Director Enclosura:
1.
IE Bulletin No. 79-13, Revision 2 2.
Listing of IE Bulletins Issued in Last Six Months cc w/ encl:
Mr. W. H. Weber, Manager, Nuclear Construction Central Files Director, NRR/DPM Director, NRR/ DOR PDR Local PDR NSIC TIC Region I & IV Ms. K. Drey Hon. C. J. Frass, Chairman Missouri Public Service Commission 1248 250 L *1 3 (c) eo2osio
SSINS:
6830 Accession No.:
7908220135 UNITED STATES NUCLDol REGULATORY COMMISSION OFFICE OT INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 October 16, 1979 IE Bulletin No. 79-13 '
Revision 2 CRACKING IN FEEDWATER SYSTEM PIPING Description of Circumstances:
This revision to IE Bulletin No. 79-13 is based on the results of the radio-graphic ec.minations and ongoing investigation of the subject problem to date since the initial Bulletin was issued.
The revision reduces in scope the R2 number and extent of the piping system welds required to be examined.
The requirements for reporting and action time frame remain unchanged.
l On May 20, 1979, Indiana and Michigan Power Company notified the NRC of cracking in two feedwater linn at their D. C. Cook Unit 2 facility. The cracking was discovered following a shutdown on May 19 to investigate leakage inside containment.
Leaking circumferential cracks were identified in the 16-inch fesdwater elbows adjacent to two steam generator nozzle elbow welds.
Subsequent radiographic examination revealed crack indications in all eight steam generator feedwater lines at this location on both Units 1 and 2.
On May 25, 1979, a letter was sent to all PWR licensees by the Office of Nuclear Reactor Regulation which informed licensees of the D. C. Cook failures and requested specific information on feedwater system design, fabrication, inspection and operating histories.
To further ezplore the generic nature of the cracking problem, the Office of Inspection and Enforcement requested licensees of PWR plants in current outages to immediately conduct volumetric examination of certain feedwater piping welds.
As a result of these actions, several other licensees with Westinghouse steam generators reported crack indications.
Southern California Edison reported on June 5, 1979, that radiographic examination revealed indications of cracking in feedwater nozzle-to-pipe welds on two of three steam generators of San Onofre Unit 1.
On June 15, 1979, Carolina Power and Light reported that radiography showed crack indications in similar locations at their H. B.
Robinson Unit 2.
Duquesne Power and Light confirmed on June 18, 1979, that radiography has shown cracking in their Beaver Valley Unit 1 feedwater piping-to-vessel nozzle weld.
Public Service Electric and Gas Company reported on June 20, 1979 that Salem Unit I also has crack indications. Wisconsin Public Service company decided on June 20, 1979
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weld which contained questionable indica 1 As of June 22, 1979 and since May 25, 19:
inspected the feedwater nozzle-to pipe wi DUPLICATE DOCUMENT
,h Entire document previously I
entered into system under:
NOTE:
R1 and R2 indf % es lines revi ANO 1248251 No. of pages: