ML19246B703
| ML19246B703 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 06/25/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Herbein J METROPOLITAN EDISON CO. |
| References | |
| NUDOCS 7907180365 | |
| Download: ML19246B703 (1) | |
Text
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KING OF PRUSSIA, PENNSYLVANIA 19406 Jane 25, 1979 Docket-Nos. 50-289 50-320
-5 ropolitan Edison Company ATTN:
Mr. J. G. Herbein Vice President P. O. Box 542 Reading, Pennsylvania 19640 Gentlemen:
The enclosed Bullehin 79-13 is forwarded to you for information. No written response is required.
If you desire idditional information regarding this matter, please contact this office.
Sincerely,
}f[.
fw oyce H. Grier W rector
Enclosures:
1.
IE Bulletin No. 79-13 w/ Attachments 2.
List of IE Bulletins Issued in 8_ast 12 Months cc w/encls:
E. G. Wallace, Licensing Manager J. J. Barton, Project Manager L. L. Lawyer, Manager - Generation Operations G. P. Miller, Manager - Generating Station - Nuclear J. L. Seelinger, Unit 1 Superintendent W. E. Potts, Unit 1 Superintendent - Technical Support J. B. Logan, Unit 2 Superintendent G. A. Kunder, Unit 2 Superintendent - Technical Support I. -R.
Finfrock, Jr.
Mr. R. Conrad G. F. Trowbridge, Esquire Miss Mary V. Southard, Chairman, Citizens for a Safe Environment
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7907180-365 Q
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ENCLOSURE 1 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
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IE Bulletin No. 79-13 Date: June 25,1979 Page 1 of 4 CRACKING IN FEEDUATER SYSTEM PIPING Description of Circumstances:
On fiay 20, 1979, Indiana and Michigan Power Company notified the NRC of cracking in two feedwi.ter lines at their D. C. Cook Unit 2 facility.
The cracking was discovered following a shutdewn on fiay 19 to investigate leakage inside containment.
Leaking circumferential cracks were identified in the 16-inch feedwater elbows adjacent to two steam generator nozzle elbow welc's.
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 Cffice 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 Mher licensees with Westinghouse steam generators reported crack indications.
Southern California Edison reported on June 5,1979, that mdiographic examination revealed indications of cracking in feedwater nozzle-to-piping welds on two of thr:e 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 : racking 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 quest-nable indication, for metallurgical examination.
As of June 22,1979 and since May 15, 1979 seven other PUR facilities have inspected the feedwater nozzle-to-pipe welds without finding cracking indicaticos.
The feedwater nozzle-to-pipe configurations for D.C. Cook and.for. San OnnPa m shown on the attached figures 1 and 2.
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weld joint detail showing the principal hDUPLICATEDOCUMENT are shown on the attached figure 3.
OiEntire document previously entered On March 17, 1977, during heat-up for ho into system under:
Unit 1, a leak was discovered in the ves ggg/g the 16-inch diameter feedwater piping to l
ANO nondestructive examination of all nozzle No. of Pages:
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