ML19224D549
| ML19224D549 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 06/25/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Cavanaugh W ARKANSAS POWER & LIGHT CO. |
| References | |
| NUDOCS 7907120590 | |
| Download: ML19224D549 (1) | |
Text
CENTRAL FII.ES p ?""'s PDR:HQ UNITED STATES ggg 4
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NUCLEAR REGULATORY COMMISSION 2.41L 5 L. g [)' %
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REGION IV
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611 HYAN PLAZA DRIVE, SUITE 1000 3 ^
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ARLINGTON, T EXAS 70012
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June 25, 1979 Docket No. 50-368 50-313 Arkansas Power and Light Company ATTN:
Mr. William Cavanaugh III Executive Director of Generation and Construction Post Office Box 551 Little Rock, Arkansas 72203 Gentlemen:
Enclosed is IE Bulletin 79-13 which requires action by you with regard to your power reactor facility with an operating license.
Should you have any questions regardire this Bulletin or the actions required by you, please contact this oftice.
Sincerely, n
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Karl V. Seyfrit/
Director
Enclosures:
1.
List of IE Bulletins Issued in Last 12 Months cc:
James P. O'llanlon, Plant Manager Arkansas Nuclear One P. O. Box 608 Russellville, Arkansas 74801 L. Alexander, QC Cupervisor
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UNITED STATES NUCLEAR REGULATORY COM?lISSION OFFICE OF INSPECTION AND ENFORCEffENT WASHINGTON, D.C.
20555 IE Bulletin No. 79-13 Date: June 25, 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.
Subse..ent 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 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 rep rted 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 ai.d 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 showa 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 a questionable indication, for metallurgical examiation. 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.
fW-i %Q -n A Cook and for San Onofre are The feedwater nozzle-to pipe corg'EEPLICAT shownontheattachedFigures1[
' * -to-nozzle weld joint detail showing the princi
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are shown on the attached Figur Previously entered system On March 17, 1977, durir g heat under-Unit 1, a leak was discovered -
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)pj the 16-inch diameter feedwater nondestructive examination of No.
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