ML19254E266
| ML19254E266 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 10/19/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Howell S CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| References | |
| NUDOCS 7910310397 | |
| Download: ML19254E266 (1) | |
Text
[fb k* "f o
/
ug' UNITED STATES
!" 3,( [oj NUCLEAR REGULATORY COMMISSION REGION lli
- g' *[/
-r 799 ROOsEVEtT ROAD o, %, ' v ctEu Ettvu. ituuOis som g,*****
OCT 191979 Docket No. 50-329 Docket No. 50-330 Consumers Power Company 4TTN:
Mr. Stephen H. Howell Vice President 1945 West Parnall Road Jackson, MI 49201 Gentlemen:
The enclosed Bulletin 79-13,..evision 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,
'e ames G. Keppler Director
Enclosures:
1.
IE Bulletin No. 79-13, Revision 2 2.
Listing of IE Bulletins Issued in Last Six Months cc w/ encl:
Central Files Director, NRR/DPM Director, NRR/ DOR PDR Local PDR NSIC TIC Ronald Callen, Michigan Public Service Commission Dr. Wayne E. North Myron M. Cherry, Chicago 7 D10310 df,7 6) l' 4
176
SSINS: 6830 Accession No.:
7908220135 UNITED STATES 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 rad graphic examinations and ongoing investigation of the subject problem to date R2 The revision reduces in scope the since the initial Bulletin was issued.
The number and extent of the piping system welds required to be examined.
1 requirements for reporting and action time frame remain unchanged.
Indiana and Michigan Power Ccmpany notified the NRC of On May 20, 1979, The cracking in two feedwater lines at their D. C. Cook Unit 2 facility.
cracking was discovered following a shutdown on May 19 to investigate leakage Leaking circumferential cracks'were identified in the inside containment.
16-inch feedwater elbow 3 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.
a letter was sent to all PWR licensees by the Office of On May 25, 1979, Nuclear Reactor Regulation which informed licensees of the D. C. Cook failures and requested specific information on feedwater system design, fabricati inspection and operating histories.
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 Southern California Edison reported on generators reported crack indications.
June 5, 1979, that radiographic examination revealed indications V er-^ing in feedwater nozzle-to pipe welds on two of three steam generato _.. aan Onofre Unit 1.
On June 15, 1979, Carolina Power and Light reported that radiography showed crack indications in similar locations at their H. B.18, 1979, th Robinson Unit 2.
Duquesne Power and Light confirmed on June radiography has shown cracking in their Beaver Valley Unit 1 feedwater piping Public Service Electric and Gas Company reported on to-vessel nozzle weld.
Wisconsin Public that Salem Unit I also has crack indications.
Service company decided on June 20, 1979 to cut out a feedwater nozzle-to pipe June 20, 1979 weld which contained questionable indication, for metallurcical examination.
As of June 22, 1979 and since May 25 inspected the feedwater nozzle-to-pi b
DUPLICIsTE DOCUMENT Entire document previously HOTE:
R1 and R2 indicates lines entered into system under:
)
k ANO No. of pages:
__