ML19254E293
| ML19254E293 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 10/17/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Koester G KANSAS GAS & ELECTRIC CO. |
| References | |
| NUDOCS 7910310422 | |
| Download: ML19254E293 (1) | |
Text
TSC UNITED STATES
/pa "' Gut #'o, NUCLEAR REGULATORY COMMISSION
^
REGloN IV
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- M J E 611 RY AN PLAZA DRIVE, SUITE 1000 7 i,
-l ARLINGTON, TEXAS 76012 3,4
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s.
p October 17, 1979 In Reply Refer To:
RlV Docket No.
STN 50-482/IE Bulletin No. 79-13 (Rev. 2)
Kansas Gas & Electric Jo.
Attn: Mr. Glenn L. Koester Vice President-Operations Post Office Box 208 Wichita, Kansas 67201 Gentlemen:
The enclosed IE Bulletin 79-13, Revision 2 is forwarded to you for information. No written response is required. If you desire additional information regarding this matter, please contact this office.
Sincerely, l'
~
j'
% ( 1 '. u - 4
r1 V. Seyfrit Director
Enclosures:
1.
IE Bulletin No. 79-13, Revision 2 2.
List of IE Bulletins Issued in the Last Six Months cc: w/ enclosures Messrs.
Nicholas A. Petrick, SNUPPS D. T. McPnee, Kansas City Power and Light Company Gerald Charnoff, Shaw, Pittman., Potts & Trowbridge E. W. Creel, Kansas Gas and Electric Company 1248 246 7 9103109 g
SSINS: 6830 Accession No.:
7908220135 UNITED STATES NUCLEAR REGULATORY COMMISSION CFFD.E OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 IE Bulletin No. 79-13 Revision 2 October 16, 1979 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 radio-graphic examinations and ongoing investigation of the subject problem 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 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 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 problem, the office of Inspection and Enforcement requested licensees of PWR plants in current outages to immediately conduct volumetric examination of certain feeduater 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 LigM ~ an d
radiography has shown cracking in their ]
to-vessel nozzle weld.
Public Service E:
NOTE: R1 and R2 indicates lines revised Entire document previously entered into system under:
ANO 1248 247 No. of pages: