ML19256E446
| ML19256E446 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 10/17/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Groce R YANKEE ATOMIC ELECTRIC CO. |
| References | |
| NUDOCS 7911070111 | |
| Download: ML19256E446 (1) | |
Text
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KING OF PRUSSIA PENNSY LVANI A INCG October 17, 1979 Docket No. 50-29 Yankee Atomic Electric Company ATTN: Mr. Robert H. Groce Licensing Engineer 20 Turnpike Road Westborough, Massachusetts 01581 Gentlemen:
Enclosed is IE Bulletin 79-13, Revision 2, which requires action by you with regard to your power reactor facility (ies) with an operating ilcense.
Should you have any questions regarding this Bulletin or the actions required by you, please contact this office.
Sincerely, k W.
oyce H. Grier
~ Director
Enclosures:
1.
IE Bulletin No. 79-13 w/ Attachments 2.
Listing ti IE Bulletins Issued Last 6 Months cc w/encls:
H. Autio, Plant Superintendent L. E. Minnick, President CONTACT:
L. E. Tripp 337-5282 791107o
ENCLOSURE 1 SSINS:
6830 Accession No.:
7908220135 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMEki WASHINGTON, D.C.
20555 October 17, 1979 IE Bulletin No. /9-13 Revision 2 Page 1 of 5 CRACKING IN FEEDWATER SYSTEM PIPING Description of Circumstances:
This revision to IE Bulletin No. 79-13 is based on the mults of the radiographic examinations and ongoing investigation of the subject probem to date since the initial Bulletin was issued.
The revision reduces in scope the number and R2 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 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 contain-ment.
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 gene ^ tor 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, inspec-tion 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 repc rted on June 5, 1979, that radiographic examination revealed indications of cracking in feedwater nozzle-to-pipe welds on two of three steam generators of Sal Onofre Unit 1.
On June 15, 1979, Carolina Power and Light reported that raciography 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.
Wisc June 20, 1979 to cut out a feedwater no?
able indication, for metallurgical exami May 25, 1979 seven other PWR facilities DUPLICATE DOCUMENT pipe welds without finding cracking indi Entire document previously NOTE: R1 and R2 indicates lines revised entered into system under:
WFW66 1"3 005 Ano N o.
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