ML19254F129
| ML19254F129 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 10/17/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Cavanaugh W ARKANSAS POWER & LIGHT CO. |
| References | |
| NUDOCS 7911070079 | |
| Download: ML19254F129 (1) | |
Text
CENTRAL. FILES UNITED STATES M
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REGION IV b
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October 17, 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:
Enclosed is IE Bulletin No. 79-13, Revision 2 which requires action by you with regard to your power reactor facilities.
Should you have any questions regarding this IE Bulletin or the actions required by you, please contact this office.
Sincerely, 7
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Karl'V. Seyfrit l;'J' P Ph
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Enclosures:
1.
IE Bulletin No. 79-13, Revision 2 2.
List of IE Bulletins Issued in the Last Six Months cc: James P. O' Hanlon, Plant Manager Arkansas Nuclear One P. O. Box 608 Russellville, Arkansas 72801 I290 34/
079 7911070 34
SSINS: 6830 Accession No.:
7908220135 UNITED STATES NUCLEAR REGULATORY C0ttISSION OFFICE OF INSPECTION AND ENFORCEMEY.r WASHINGTON, D.C.
20555 IE Bulletin No. 79-13 Revision 2 October 16, 1979 Page 1 of 5 CRACKING IN FEEDWATER SYSTEM PIPING Description of Circumstances:
P This revision to IE Bulletin No. 79-13 is based on the results of the radio-graphic examinations 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.
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 uisecvered fellowing a shutdown on May 19 to investigate les' rage inside containment. Leaking circumferential cracks were identified in the 16-inch feedwater elbows adjacent to two steam generator nozzle elbow welds.
Subsequent radiographic examinar. ion revealed crack indications in all eight steam generator feedwater lines at this locs. tion 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 licenstes 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 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 simila locations at their H. B.
Robinson Unit 2.
Duquesne Power and Li ht confirmed on June 18 1979 that radiography has shown cracking in their to-vessel nozzle weld. Public Service DUPLICATE DOCUMENT NOTE: R1 and R2 indicates lines revise Entire document previously entered to s t
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