ML19253A536
| ML19253A536 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 08/30/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Cavanaugh W ARKANSAS POWER & LIGHT CO. |
| References | |
| NUDOCS 7909100239 | |
| Download: ML19253A536 (1) | |
Text
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'o UNITED STATES PDR:HQ E5 Yo NUCLEAR REGULATORY COMMISSION LPtR
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Gil RYAN PL AZA DRIVE, SulTE 1000 331C g' ' 6e 4 /
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August 30, 1979 Docket Nos.
50-313 50-368 Arkansas Power and Light Company ATTN:
Mr. William Cavanaugh III Vice President of Generation and Construction P. O. Box 551 Little Rock, Arkansas 72203 Gentlemen:
IE Bulletin 79-13 was originally sent to you for actioa on June 27, 1979.
The enclosed IE Bulletia 79-13, f.evision 1 is forwarded to you for informnion.
No written response is required.
This Revision is being dispatched for action to the additional Utilities, listed in Enclosure 3, who are applicants for operating licenses.
If you desire additional information regarding this matter, please contact this office.
Sincercly, I.?
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'Karl V. Seyfrit' Director
Enclosures:
1.
IE Bulletin No. 79-13, Revision 1 2.
List of IE Bulletins Issued in Last Six Months 3.
Designated Applicants for Operating Licenses cc:
James P. O'Hanlon, Plant Manager Arkansas Nuclear One P. O. Box 608 33 U,I.j6 Russellville, Arkansas 72801 gae918 p o r?
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UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 IE Bulletin No. 79-13 Revision 1 Date: August 30, 1979 Page 1 of 4 CRACKING IN FEEDWATER SYSTEM PIPING Description of Circumstances:
On May 20, 1979, Indiana and Michigan Power Company notified the NRC of cracking in two feedwater lines 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 feedwater elbows adjacent to two steam generator nozzle elbow welds.
Subsequent radiograph 'c 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 explore 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 piping 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 1 also has crack indications. Wisconsin Public Service Company decided on June 20, 1979, to cut out a feedwater nozzle-to pipe weld which contained questionable indication, for metallurgical examination.
As of June 22, 1979, and since May 25, 1979, seven other PWR facilities have inspected the feedwater nozzle-to pipe welds without finding cracking indications.
The feedwater nozzle-to pipe configurations for D. C. Cook and for San Qqofre are shown on the attached Figures 1 [-
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weld joint detail showing the princi fDUPLICATEDOCUMENT OOgggg~
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