ML19254F177
| ML19254F177 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 10/17/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Lundvall A BALTIMORE GAS & ELECTRIC CO. |
| References | |
| NUDOCS 7911070261 | |
| Download: ML19254F177 (1) | |
Text
Yh on accoq'o UNITED STATES
+8 f) #q NUCLEAR REGULATORY COMMISSION
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KING OF PRUSSIA PENNSYLVANIA 19406 631 PARK AVENUE
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,o October 17, 1979 Docket Nos. 50-317 50-318 Baltimore Gas and Electric Company ATTN: Mr. A. E. Lundvall, Jr.
Vice President, Supply P. O. Box 1475 Baltimore, Maryland 21203 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 license.
Should you have any questions regarding this Bulletin or the actions required by you, please contact this office.
Sincerely, 3
ff Boyce 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. M. Douglass, Manager, Ouality Assurance L. B. Russell, Chief Engineer W. Gibson, General Supervisor, Operations OA R. C. L. Olson, Senior Engineer K. H. Sebra, Principal Engineer 1289 M -
CONTACT:
L. E. Tripp 337-5282 7911070 3 g
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ENCLOSURE 1 SSINS:
6830 Accession No.:
7908220135 UNITED STMES 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 FEEDWATER 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 20,1979,1^.di9na and Michigan Power Company notified the NRC of cracking in two feedwater lincs 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 circumfer M ial cracks were identified in the 16-inch feedwater elbows adjacent to two steam generator nozzle elbow welds. Subsequent radiographic examination revealed crack indicatior.s 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 al; PWR licensees by the Office of Nuclear Reactor Regulation which informed licensee of the J. C. Cook Gilures 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 condect vclumetric examination of certain feedwater piping welds.
As a result of these actions, several other licentees with Westinghouse steam generators reported crack indications.
Southern Cali~ornia Edison reported on June 5, 1979, that radiographic examination revealed,adications 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 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 Ga: Company reported on June 20, 1979 that Salem Unit 1 also has crack indications. Wisco June 20, 1979 to cut out a feedwater nozz able indication, for metallurgical e amin May 25, 1979 seven other PWR facilities h DUPLICATE DOCUMENT pipe welds without finding cracking indic Entire document previously NOTE: R1 and R2 indicates lines revised entered into system unde ANO j}gg ((7 o'f pages:
No.