ML19249E744
| ML19249E744 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 08/30/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Koester G KANSAS GAS & ELECTRIC CO. |
| References | |
| NUDOCS 7910020321 | |
| Download: ML19249E744 (1) | |
Text
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fj(b g# UC%go UNITED STATES e
f'Njh.7, NUCLEAR REGULATORY COMMISSION T,, g _~
cj REGION IV S 'l 4
611 RYAN PLAZA DRIVE, SUITE 1000
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,o AR LINGToN, TE X AS 76012 9 **..*
August 30, 1979 In Reply Rcfer To:
RIV Docket No.
STN 50-482/IE Belletin No. 79-13, Revision 1 Kansas Gas & Electric Co.
Attn:
Mr. Glenn L. Koester Vice President-Operations Post Office Box 208 Wichita, Kansas 67201 Gentlemen:
IE Bulletin 79-13 was originally sent to you for action on June 27, 1979.
The enclosed IE Bulletin 79-13, Revision 1 is forwarded to you for information.
No written response is required.
This Revision is being dispatched for action to the additional Utilities, listed in Enclosure 3, who are applicants for operating licenses.
If you desire additional information regarding this matter, please contact this office.
Sincerely, Karl V. Seyfri Director Y
Enclosures:
1.
IE Bulletin No. 79-13, Revision 1 2.
List of IE Bulletins Issued in Last Six Months 3.
Designated Applicants for Operating Licenses ec: w/ enclosures
!!essrs. Nicholas A. Petrick, SNUPPS D. T. McPhee, Kansas City Power and Light Company Gerald Charnof f, Shaw, Pittman, Potts & Trowbridge E. W. Creel, Kansas Gas and Electric Company
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UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 IE Bulletin No. 79-13 Revision 1 Date: August 30, 1979 Page 1 of 4 CRACKING IN FEEDWATER SYSTEM PIPING Description of Circumstances:
On May 20, 1979, Indiana and Michigan Power Company notified the hTC 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 probiem, 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 piping 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 Gas Comaa.sy reported on June 20, 1979, that Salem Unit 1 also has crack indicationt.
Wisconsin Puislic Service Company decided on June 20, 1979, to cut out a feedwater nozzle-to pipe weld which contained questionable indication, fot metallurgical examination.
As of June 22, 1979, and since May 25, 1979, seven other PWR facilities have inspected the feedwater nozzle-to pipe welds without finding cracking indications.
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The feedwater nozzle-to-pipe config{ DUPLICATE DOCUMENT _
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are shown on the attached Figures 1 i
weld joint detail showing the princ
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Onofre are shown on the attached Fi. Entire document previously entered into system under:
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DESIGNATED APPLICANTS FOR OPERATING LICENSES Salem 2 Nortil Anna 2 Diablo Canyon 1 & 2 Sequoyah 1 McGuire 1 San Onofre 2 Summer Watts Bar 1 & 2 e}}