ML19224D547
| ML19224D547 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 06/25/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Short T OMAHA PUBLIC POWER DISTRICT |
| References | |
| NUDOCS 7907120588 | |
| Download: ML19224D547 (1) | |
Text
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- - g AR LINGTON,1 E X AS 76012 June 27, 1979 Docket No. 50-285 Omaha Public Power District ATTft: Mr. T. E. Short, Division Manager Production Operations 1623 Harney Street Omaha,fiebraska 68102 Gentlemen:
On June 25, 1979,Bulletin 79-13 was sent to you. The corresponding cover letter indicated that the Bulletin was being fonvarded for information.
This was an error.
IE Bulletin 79-13 does, in fact, require action by you with regard to your power reactor facility with an operating license.
Should you have any questions regarding this Bulletin or the actions required by you, please contact this office.
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Sincerely, 1
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Karl V. Seyfri Director cc:
R. L. Andrews,f1anager Fort Calhoun Station P. O. Box 98 Fort Calhoun, flebraska 68102 354 Sb9
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June 25, 1979 Docket No. 50-285 Omaha Public Power District ATTN:
Mr. T. E. Short, Division Manager Production Operations 1623 Harney Street Omaha, Nebraska 68102 Centlemen:
The enclosed IE Bulletin 79-13 is forwarded to you for infornation. No written respor.se is required.
If you desire additional information regarding t' matter, please contact this office.
Sincerely, Q{ftil >g7d.
~Karl V. Seyffic Director Snclosures:
1.
Listing of IE Bulletins Issued in Last 12 Months cc:
R. L. Andrews, Ibnager Fort Calhoun Station Post Office Box 98 Fort Calhoun, Nebraska 68102
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UNITED STATES NUCLEAR REGULATORY CO:f!ISSION OFFICE OF INSPECTION AND ENFORCEMF.NT WASHINGTON, D.C.
20555 IE Bulletin No. 79-13 Date: June 25, 1979 Page 1 of 4 CRACKING IN FEEDWATER SYSTEM PIPING Description of Circumstances:
On May 20, 1979, Indiana and ilichigan Pcwcr 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 nozz1c 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 Of fice 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 probleu,-the Office of Inspection and Enforcement requested licenseer of PWR plants in current outages to imradiately 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 Pos er and Light report.d that radiography showed crack indications in similar locations at their H. 1;. Robinson Urit 2.
Duquesne Power and Light confirmed on June 18, 1979, that radiography has shown cracking in their Beaver Valley Unit 1 feedwater pipiag to versel nozzle weld.
Public Service Electric and Gas Company reported on June 20, 1979 that Salem Unit 1 also has crack indications. Wisconsin Public Service Company decided on June 20, 1979 to cut out a feedwater nozzle-to-pipe weld which contained a questionable indication, for metallurgical exer.iation. 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 configurations for D.C. Cook and for San Onofre are shown on the attached Fi ures 1 an r ~ ~ ~'
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m wm joint detail showing the principal are shown on the attached Figure 3] DUPLICATE DOCUMENT
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On March 17, 1977, during heat-up d Entire document previously s
Unit 1, a leak was discovered in tt into system under:
the 16-inch diameter feedwater pipf 7Q A/
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