ML19207C193
| ML19207C193 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 08/30/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Nichols T SOUTH CAROLINA ELECTRIC & GAS CO. |
| References | |
| NUDOCS 7909100229 | |
| Download: ML19207C193 (1) | |
Text
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9'o UNITED STATES 8
NUCLEAR REGULATORY COMMISSION ggg G7r c,
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a 101 MARIETTA ST., N.W., SulTE 3100 g
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ATLANTA, GEORGIA 30303 AUG 3 01979 In Reply Refer To:
RII:JPO 50-395 South Carolina Electric and Gas Company Attn:
T. C. Nichols, Jr., Vice President Power Production and System Operations Post Office Box 764 Columbia, South Carolina 29218 Gentlemen:
Enclosed is IE Bulletin 79-13, Revision I which requires action by you with regard tc your power reactor facility (ies) identified in Enclosure 3.
Should you have any questions regarding this Bulletin or the actions required by you, please contact this office.
Sincerely, (7 i w
James P. O' Reil y Director
Enclosures:
1.
IE Bulletin No. 79-13, Revision 1 2.
List of IE Bulletins Issued in Last Six Months 3.
Designated Applicants for Operating Licenses 330001 79091002 2 7 s@lgo 01
Accession No: 7908220101 SSINS No.
6830 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECT 10F AND ENFORCEMENT WASHINGTON, D t 20355 t
August 30, 1979 IE Bulletin No. 79-13 Revision 1 CRACKING Ih FEEDWATER SYSTEM PIPING Description of Circumstances:
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 generat ar 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 cnd requested specific information on feedwater system design, fabrication, inspectica 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 piping welds on two of three steam generators of San Onofre Unit 1.
On June 15, 1979, Carolin: 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 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 irispected the feedwater nozzle-to pipe we ','
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indications.
DUPLICATE DOCUMENT M ", ME The feedwater nozzle-to pipe configuratic are shown on the attached figures 1 and Entire document previously entered weld joint detail showing the principal into system under:
Onofre are shown on the attached figure Ano 9 9 0 322 O / 01 NGOT no. of pages:
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