ML19256E451
| ML19256E451 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 10/17/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Nichols T SOUTH CAROLINA ELECTRIC & GAS CO. |
| References | |
| NUDOCS 7911070140 | |
| Download: ML19256E451 (1) | |
Text
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UNITED STATES
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g NUCLEAR REGULATORY COMMISSION
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8 101 MARf ETTA ST N.W., SUITE 3100
- g ATLANTA, GEORGIA 30303 OCT 171979 In Reply Refer To:
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South Carolina Electric and Gas Company Attn:
T. C. Nichols, Jr., Vice President Power Production and System Operations P. O. Box 764 Columbia, South Carolina 29218 Gentlemen:
Enclosed is IE Bulletin 50. 79-13, Revision 2 which requires action by you with regard to your power reactor facility (ies).
Should you have any questions regarding this Bulletin or the actions required by you, please contact this office.
Sincerely, 5
0 m
mes P. O'Reilly D ector
Enclosures:
1.
IE Bulletin No. 79-13, Revision 2 w/ Attachments 2.
List of IE Bulletins Issued in Last Six Months i
3 017 7911070f
SSINS:
6830 Accession No.:
7908220135 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 October 16, 19 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 te be examined. The requirements for reporting and action time frame remain unchange 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 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 cu: rent outages to immediately conduct volumetric examination of certain feedwater piping welds.
As a result of these actions, several other licensees with Westinghouse steam generatsrs 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 raported that radiography showed crack indications in similar locat. d'at their H. B.
Robinson Unit 2.
Duquesne Power and Light confirmed on June 18, 1979, that radiography has shown cracking in their B to-vessel nozzle weld.
Public Service El June 20, 1979 that Salem Unit 1 also has Service company decided on June 20, 1979 DUPLICATE DOCUMENT weld which contained quettionable indicat As of June 22, 1979 and since May 25, 197 Entire doctuncnt previously inspected th-feedwater nozzle-to pipe we entered into system under:
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