ML19254E186
| ML19254E186 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 10/19/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Crouse R TOLEDO EDISON CO. |
| References | |
| NUDOCS 7910310264 | |
| Download: ML19254E186 (1) | |
Text
ILL 8(' 3,,( ['o,,
UNITED STATES NUCLEAR REGULATORY COMMISSION o
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o GLEN ELLYN. lLLINOIS 6o137 OCT 191979 Docket No. 50-346 Toledo Edison Company
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ATTN:
Mr. Richard P. Crouse Vice President Energy Supply Edison Plaza 300 Madison Avenue Toledo, OH 43652 Gentlemen:
Enclosed is IE Bulletin No. 79-13, Revision 2 which requires action by you with regard to your pressurized water power reactor facility.
Should you have any questions regarding this Bulletin or the actions required by you, please contact this office.
Sincerely,
- 0. '
James G. Keppler Director
Enclosures:
1.
IE Bulletin No. 79-13, Rev. 2 2.
List of IE Bulletins Issued in the Last Six Months cc w/ encl:
Mr. T. Murray, Station Superintendent Central Files Director, NRR/DPM P. rector, NRR/ DOR PDR Local PDR NSIC TIC Harold W. Kohn, Power Siting Commission Helen W. Evans, State of Ohio p/ L-h910310 G) 1248 003
SSINS:
6830 Accession No.:
7908220135 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 October 16, 1979
's 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 welds required to be examined. The requirements for reporting and action time frame remain unchanged.
1 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 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 Euclear Reactor Regulation which informed licensees of the D. C. Cook failures and requested specific information on feedwater system design, fat'rication, 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 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, I weld which contained questionable ind As of June 22, 1979 and since May 25, inspected the feedwater nozzle-to pip DUPLICATE DOCUMENT
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