ML19260A188
| ML19260A188 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 10/17/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Stampley N MISSISSIPPI POWER & LIGHT CO. |
| References | |
| NUDOCS 7911070201 | |
| Download: ML19260A188 (2) | |
Text
fn UNITED STATES f ' ^,,
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g NUCLEAR REGULATORY COMMISSION g
-r REGION 11 o
101 MARIETTA ST N.W., SUITE 3100 o
ATLANTA, GEORGIA 30303 OCT 171979 In Reply Refer To:
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Mississippi Power and Light Company Attn:
N. L. Stampley Vice President of Production P. O. Box 1640 Jackson, Mississippi 39205 Gentlemen:
The enclosed Bulletin No. 79-13, Revision 2 is forwarded to you for infor-mation.
No written response is required.
If you desire additional information regarding this matter, please contact this office.
Sincerely,
% \\. 6 ames P. O'Reilly
' rector
Enclosures:
1.
IE Bulletin No. 79-13, Rev on 2.
Listing of IE Bulletins Issued in Last Six Months 1299 321 791107o M k
OCT 171979 Mississippi Power and Light Company -
cc w/ enc 1:
C. K. McCoy Plant Manager Post Office Box 756 Port Gibson, Mississippi 39150 1299 '22
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 revis An to IE Bulletin No. 79-13 is based on the results of the radio-graphic exat inations and ongoing investigation of the subject problem to date since the inrtial 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.
On May 20, 1979, Indiana and Michigan Power Company notified the NBC 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 problen, 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 Gult 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 th ee 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, 197 that radiography has shown cricking in their to-vessel nozzle weld. I2blic Service E June 20, 1979 that Salem Unit I also has DUPLICATE DOCUMENT Service company decided on June 20, 1979 weld which contained questionable ir. dica Entire document previously As of June 22, 1979 and since May 25, 19 entered into system under:
inspected the feedwater nozzle-to pipe w
)b ANO 1299 323
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No. of pages:
NOTE:
R1 and R2 indicates lines revis