ML19256E455
| ML19256E455 | |
| Person / Time | |
|---|---|
| Site: | Atlantic Nuclear Power Plant  |
| Issue date: | 10/17/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Collier A OFFSHORE POWER SYSTEMS (SUBS. OF WESTINGHOUSE ELECTRI |
| References | |
| NUDOCS 7911070161 | |
| Download: ML19256E455 (1) | |
Text
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'o UNITED STATES NUCLEAR REGULATORY COMMISSION n
. b[
E REGION 11 0,
101 MARIETTA ST N.W., SUITE 3100 o
ATLANTA, GEORGIA 30303 OCT 171979 In Reply Refer To:
RII:JR0
&A Offshore Power Systems Attn:
A. R. Collier, President P. O. Box 8000 Jacksonville, Florida 32211 Gentlemen:
The enclosed Bulletin No. 79-13, Revision 2 is forwarded to you for infor-mation. No written response is cequired.
If you desire additional information r=garding this matter, please contact this office.
Sincerely, S
O ki
%ames P. O'Reilly rector
Enclosures:
1.
IE Bulletin No. 79-13, evision 2 2.
Listing of IE Bulletins Issued in Last Six Months
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' 791107 0 / b f
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 revision to IE Bulletin No. 79-13 is based on the res dts of the radio-graphic examinations and ongoing investigation of the subject prablem 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 f rame remain nachanged.
On May 9.0, 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 no7zle elbow welds.
Subsequent radiographic examination revealed crack indicatiens u 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 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 radiography has shown cracking in their to-vessel nozzle weld. Public Service June 20, 1979 that Salem Unit 1 also ha Service company decided on June 20, 197 DUPLICATE DOCUMENT weld which contained questionable indic As of June 22, 1979 and since May 25. 1 Entire document Prev 2.ously inspected the feedwater nozzle-to pipe entered into system under.
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NOTE:
R1 and R2 indicates lines revi No.