ML19254F179
| ML19254F179 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 10/17/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Woolever E DUQUESNE LIGHT CO. |
| References | |
| NUDOCS 7911070264 | |
| Download: ML19254F179 (1) | |
Text
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UNITED STATES
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NUCLEAR REGULATORY COMMISSION 7'
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%, *....f KING OF PRUSSIA, PENNSYLVANI A 19403 October 17, 1979 Docket No. 50-412 Duquesne Light Company ATTN: Mr. E. J. Woolever Vice President 435 Sixth Avenue Pittsburgh, Pennsylvania 15219 Gentlemen:
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.
Sincerely, Boyce H. Grier Director
Enclosures:
1.
IE Bulletin No. 79-13 w/ Attachments 2.
Listing of IE Bulletins Issued in Last 6 Months cc w/encls:
R. J. Washabaugh, Quality Assurance Manager
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c; CONTACT:
L. E. Tripp 337-5282 7911070 h b i
ENCLOSURE 1 SSINS:
6830 Accession No.:
7908220135 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 October 17, 1979 IE Bulletin No. 79-13 Revision 2 Page 1 of 5 CRACKING IN FEEDWATER SYSTEM PIPING Description of Circumstances:
This revision to IE Bulletin No. 79-13 is based on the results of the radiographic examinations and ongoing investigation of the subject problem to date since the initial Bulletin was issued. The revision reduces in scope the number and R2 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 discovered following a shutdown on May 19 to investigate leakage inside contain-ment.
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, inspec-tion 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 cartain 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 Flectric and Gas Company reported on June 20, 1979 that Salem Unit 1 also has crack indications.
Wisconsin Public Service co v decided on June 20, 1979 to cut out a feedwater nozzi able indication, for metallurgical examina May 25, 1979 seven other PWR facilities ha pipe welds without finding cracking indica DUPLICATE DOCUMENT NOTE: R1 and R2 indicates lines revised o Entire document previously entered into system unde y ANO No. of pages: