ML19254F134
| ML19254F134 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 10/17/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Counsil W CONNECTICUT YANKEE ATOMIC POWER CO. |
| References | |
| NUDOCS 7911070093 | |
| Download: ML19254F134 (1) | |
Text
- ps** "'Cg yg UNITED STATES
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NUCLEAR REGULATORY COMMISSION C
REGION I
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631 PARK AVENUE S,
D k, +...".,o KING OF PRUSSIA, PENNSYLVANIA 19406
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Docket No. 50-213 Connecticut Yankee Atomic Power Company ATTN: Mr. W. C Counsil Vice President - Nuclear Engineering and Operations P, 0. Box 270 Hartford, Connecticut 06101 Gentlemen:
Enc:osed is IE Bulletin 79-13, Revision 2, which requires action by you with regard to your power reactor facility (ies) with an operating license.
Should you have any questions regarding this Bulletin or the actions required by you, please contact this office.
Sincerely, i
ssf.
~
oyce H. Grier Director
Enclosures:
1.
IE Bulletin No. 79-13 w/ Attachments 2.
Listing of IE Bulletins Issued in Last 6 Months cc w/encls:
R. Graves, Plant Superintendent D. G. Diedrick, Manager of Quality Assurance J. R. Himmelwright, licensing Safeguards Engineer CONTACT:
L. E. Tripp 337-5282 1290 353 O 7911070
ENCLOSURF_1_
SSINS:
6830 Accession No.:
'908220135 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 October 17, 1979 IE Bulletin No. 79-13 Revision 2 Page 1 of 5 CRACKING IN FEEDWAEQ SYSTEM PIPING Description of Circumstances:
This revision to IE Bulletin No. 79-13 is based on the results of the radiographic examinations and ongoing investigation of the subject problem 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 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 specitic 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 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 crtck 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 Ser ice Electric and Gas Company reported on June 20, 1979 that Salem Unit 1 also has crack indications. Wisconsi June 20, 1979 to cut out a feedwater nozz able indication, for metallurgical examin May 25, 1979 seven other PWR facilities h5 DUPLICATE DOCUMENT pipe welds without finding cracking indic Entire document previously NOTE: R1 and R2 indicates lines revised er.tered into s st m un ey 12 0
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