ML19254E271
| ML19254E271 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 10/19/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Gerstner W ILLINOIS POWER CO. |
| References | |
| NUDOCS 7910310403 | |
| Download: ML19254E271 (1) | |
Text
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'o UNITED STATES l
8 NUCLEAR REGULATORY COMMISSION c.
E REGION lit n
799 ROOSEVELT ROAD g
o GLEN ELLYN. lLLINOIS 60137 g
e
- ..+
OCT 191979 Docket No. 50-461 Docket No. 50-462 Illinois Powe-Company ATTN:
Mr. W. C. Gerstner Executive Vice President 500 South 27th Street Decatur, IL 62525 Gentlemen:
The enclosed 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, bbi W V h
/
i ames G. Keppler Director
Enclosures:
1.
IE Bulletin No. 79-13, Revision 2 2.
Listing of IE Bulletins Issued in Last Six Monchs cc w/ enc 1:
Central Files Director, NRR/DPM Director, NRR/ DOR PDR Local PDR NSIC TIC Mt. Dean Hansell, Office of Assistant Attorney General
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4 791031o 4-0 3
SSINS:
6830 Accession No.:
7908220135 UNITED STAT C NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 October 16, 1979 IE Bulletin No. 79-13 '
Revision 2 CRACKING IN FEEDWATER SYSTEM PIPING Description of Circumstances:
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 we' ids required to be examined.
The j
requirements for reporting and action time frame remain unchanged.
p 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 containment.
Leaking circumfe ential cracks were identified in the 16-inch feedwater elbows adjacent to two steam generator nozzle elbow welds.
Subsequent rrdiographic examination revealed crack indications in all eight steam generator feedwater lines at this locatien on both Units 1 and 2.
On May 25, 1979, a letter was i.ent 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 octages 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 indicatioas 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 Electric. and Gas Company reported on June 20, 1979 that Salem Unit I also has crack indications. Wisconsin Public Service company decided on June 20,197^ '- -"' ~ * - **~' -+- =a"1--+a-aina weld which contained questionable indic As of June 22, 1979 sai since May 25,1 inspected the feedwaa r nozzi to pipe DUPLICATE DOCUMENT
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Entire document previously NOTE:
R1 and R2 indicate's lines res entered into system under:
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