ML19207C194
| ML19207C194 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 08/30/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Mary Johnson SOUTH CAROLINA ELECTRIC & GAS CO. |
| References | |
| NUDOCS 7909100230 | |
| Download: ML19207C194 (2) | |
Text
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- E a UNITED STATES 8
NUCLEAR REGULATORY COMMISSION cfb <j{/5
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8 101 MARIETTA ST., N.W., SUITE 3100 o[
ATLANTA, C EORGIA 303o3 AUG 3 01979 In Reply Refer To:
RII:JP0 50-395 South Carolina Electric and Gas Company Attn:
M. C. Johnson, Vice President Special Services and Purchasing Post Office Box 764 Columbia, South Carolina 29218 Gentlemen:
Enclosed is IE Bulletin 79-13, Revision I which requires action by you with regard to 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,
'Q-^%
n 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 Y
%m n o c 3 7 9 0910 01 C) 2 500220M
AUG b 013/2 South Carolina Electric and Gas Company -
cc w/ encl:
T. B. Conners, Jr.
Conners, Moore and Corber 1747 Pennsylvaaia Avenue, N.W.
Washington, D.C.
20006 A. A. Smith Quality Assurance Post Office Box 8 Jenkinsville, South Carolina 29065
- 0. S. Bradham, Manager Nuclear Operations Post Office Box 8 Jenkinsville, South Carolica 29065 A
930004
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Accession No: 7908220101 SSINS No.
6830 UNITED STATES NUCLEAR REGULAf0RY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 August 30, 1979 IE Bulletin No. 79-13 Revision 1 CRACKING IN FEEDWATER SYSTEM PIPING Description of Circumstances:
On May 20, 1979, Indiana and Michigan Power Company notified the FUC of cracking in two feedwater lines at their D. C. Cook Unit 2 facili he 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 exam'. nation 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 current outages to immediately conduct volumetric examination of certain feedwater piping welds.
As a result of these actions, several other licensees with Westirghouse steam generators reported crack indications.
Southern California Edisan 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, Carolina Power and Light reported that radiography showed crack indications in similar Jocations 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 iadications.
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 inspected the feedwater nozzle-to pipe welds withont findiaa ---
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indications.
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lDUPLICATE DOCUMENT The feetwater nozzle-to pipe configuratior) 93(10gr-->
are shown on the attached figures 1 and 2. j Entire document previously en.ered weld joint detail showing the principal crjinto system under:
j Onofre are shown on the attached figure 3.
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