ML19254E297
| ML19254E297 | |
| Person / Time | |
|---|---|
| Site: | Waterford  |
| Issue date: | 10/17/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Aswell D LOUISIANA POWER & LIGHT CO. |
| References | |
| NUDOCS 7910310426 | |
| Download: ML19254E297 (1) | |
Text
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NUCLEAR HEGULATORY COMMISSION
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October 17, 1979
's,....'f In Reply Refer To:
RIV Docket No.
50-382/IE Bulletin 79-13 (Rev. 2)
Louisiana Power and Light Co.
AITN:
Mr. D. L. Aswell Vice President of Power Production 142 Delaronde Street New Orleans, Louisiana ~
70174 Gentle:ren:
The enclosed IE 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.
Sincerel,,
'i i
./ /, /.?'k,.f 2-n; Karl V. Seyfrit~
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Director
Enclosures:
1.
IE Bulletin No. 79-13, Revision 2 2.
List of IE Bulletins Issued in the Last Six Months 1248 262 7910310 4-46
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SSINS:
6830 Accession No.:
7908220135 UNITED STAT 2S WCLEfd: REGULATORY COMMISSION CJF'.E OF INSPECTION AND ENFORCEMENT 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:
This revision to IE Euller.in No. 79-13 is based on the results of the radio-graphic oxaminations and ongoing investigation of the subject problem to date since the initial Bulletin was issued. The revision redizes 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 t-o 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 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 feedwa,ter piping welde As a resuit 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 to-vessel nozzle weld. Public Service NOTE: R1 and R2 indicates lines revise DUPLICATE DOCUMENT Entire document previously entered into system under:
1248 263 xNo 77472.2# /3 No. of Pages: