ML19207C196
| ML19207C196 | |
| Person / Time | |
|---|---|
| Site: | Cooper  |
| Issue date: | 08/30/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Pilant J NEBRASKA PUBLIC POWER DISTRICT |
| References | |
| NUDOCS 7909100243 | |
| Download: ML19207C196 (1) | |
Text
PDR:i!Q 7 (qj'g e
8 y;)FW[,8 NUCLEAR REGULATORY COMMISSION g
L' Gii s
HEGION IV IR Ss 611 RYAN PLAZA DRIVE, SUITE 1000 Sk ' " I[d U
ARLINGTON, TE X AS 76012 Il3IC o
- seur August 30, 1979 Docket No.
50-298 Nebraska Public Power District ATTN:
J. M. P11 ant, Director Licensing & Quality Assurance Post Office Box 499 Columbus, Nebraska 68601 Gentlemen:
IE Bulletin 79-13 was originally sent to you for actica on June 27, 1979.
The enclosed IE Bulletin 79-13, Resision 1 is for::arded to you for info nation.
No written response is required. This Revisica is being dispatched for action to the additional Utilities, lbted in Enclosure 3, who are applicants for operating licenses.
If you c'estre additional information regarding this catter, please contact this office.
Sincerely, tarl V. Seyf rit Director
Enclosures:
qh1 1.
IE Eulletin !O. 79-13, 0
Re.rieion 1 dd 2.
List of IE Eulletins tz Q'
7 f~r? ] Gj ] }k bla 1 j (Uj j 3.
Designated Applicants for Operating Licenses cc:
L. C. Lessor, Superintendent Cooper t'uclear Station Post Office Box 98 Brownville, Nebraska 68321 190U10 o z73 e
UNITED STATES NUCLEAR REGULATORY COMMISSICN OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 IE Bulletin No. 79-13 Revision 1 Date: August 30, 1979 Page 1 of 4 CRACENG IN FEEDWATER SYSTEM PIPING Descriptica of Circumstances:
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 nozzlc 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 FRR 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 i e 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 re caled 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 locaticas 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 I feedwater piping to vessel nozzle weld.
Public Service Electric ana Gas Company reported on June 20, 1979, that Salem Unit I also has crack indications.
Wisconsin Public Service Company decided on June 20, 1979, to cut out a feedwater nozzle-to pipe weld which contained questionable indication, for 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.
The feedwater nozzle-to pipe configuf r~ fer n
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are shown on the attached Figures 1 g
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weld joint detail showing the princi $ DUPLICATE DOCUMENT Onofre are shown on the attached Fig l l3[3(}{}{5f}
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