ML19224D614
| ML19224D614 | |
| Person / Time | |
|---|---|
| Site: | Marble Hill |
| Issue date: | 06/25/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Coughlin J PSI ENERGY, INC. A/K/A PUBLIC SERVICE CO. OF INDIANA |
| References | |
| NUDOCS 7907130147 | |
| Download: ML19224D614 (1) | |
Text
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'4, UNITED STATES O
N UC LE AR REGULATORY COMMISSION
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'l REGloN lli 799 ROOSE VE LT RO AD
.4 g G LE N E LL v N. lLLINof S 60137 June 25, 1979 Docket No. 50-546 Docket No. 50-547 Public Service of Indiana ATTN:
Dr. James CougD11n Vice President, Nuclear 1000 East Main Street Plainfield, IN 46168 Centlemen:
The enclosed IE Bulletin No. 79-13 is forwarded to you for information. No written response is required.
If you desire additional information regarding this matter, please contact this office.
Sincerely, oh ames G. Keppler Director
Enclosures:
- 2. Listing of IE Bulletins Issued in Last 12 Months cc w/ encls:
Mr.
R. M. Brown, Construction Project Superintendent Central Files Director, NRP/ DPM Director, NRR/ DOR PDR Local PDR NSIC TIC LeBoeuf, Lamb, Leiby & MacRae 369 050 c
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U.S. NUCLEAR REGl'_ATORY COMMISSION OFFICE OF INSPFCTION AND ENFORCEMENT REGION III June 25, 1979 IE Bulletin No. 79-13 CRACKING IN FEEDWATER SYSTEM PIPING Dercription of Circumstances:
On May 20, 1979, Indiana and Michigan Power Ccmpany 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.ozzle 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 infornation 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 cracki.ig in feedwater nozzle-to-piping 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 veld. 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 questionable indication, for metallurgical examination. 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.
The feedwater nozzle-to-pipe configurations for D.C. Cook and for San Onofre are shown on the attached figures 1 and 2.
A typical feedwater pipe-to-nczzle weld joint detail showing the principal crack locations for D.C. Cook and San Onofre are shown on the attached figure 3.
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On March 17, 1977, during heat-up for hot fu'
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Unit 1, a leak was discovered in the vessel DUPLICATE DOCUMENT the 16-inch diameter feedwater piping to ste.
nondestructive examination of all nozzle weli Entire document previously entered 1
into system under:
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