ML19224D550
| ML19224D550 | |
| Person / Time | |
|---|---|
| Site: | Cooper  |
| Issue date: | 06/27/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Pilant J NEBRASKA PUBLIC POWER DISTRICT |
| References | |
| NUDOCS 7907120591 | |
| Download: ML19224D550 (1) | |
Text
CENTRAL FILES c
PDR:H j'[y. _ gp a r.gn, UNITED STATES
- .. "7.+g[ j NUCLEAR REGULATORY COMMISSION
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ARLINGTON, TEX AS 76012 June 27,19/9 Docket No 50-298 Nebraska Public Power District ATTN: Mr. J. H. Pilant, Licensing &
Quality Assurance Manager P. O. Box 499 Columbus, Nebraska 68601 Gentlemen:
On June 25, 1979,Bulletin 79-13 was sent to you. The corresponding cover letter indicated that action was required. This was an error.
IE Bulletin 79-13, in fact, should have been forwarded to you for information. No written response is required.
If you desire additional information regarding this matter, please contact this office.
Sincerely, fl Ka Seyfri Director cc:
L. C. Lessor, Superintendent Cooper Nuclear Station P. O. Box 98 Brownville, Nebraska 68321 k
)[IJ 79071 2051/'!
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June 25, 1979 Docket No. 50-293 Nebraska Public Power District ATTN:
Mr. J. M. Pilant, Licensing &
Quality Assurance Manager Post of fice Box 499 Columbus, Nebraska 68631 Gentleaen:
Enclosed is IE Bulletin 79-13 which requires 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 of fice.
Sincerely,
/Q f}
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WI r/
Karl V. Seyfrit Director
Enclosures:
1.
List of IE Bulleeins Issued in Last 12 Months cc:
L. C.
Lessor, Superintendent Coop (r Nuclear Station Post Office Box 98 Brownville, Nebraska 68321
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UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 IE Bulletin No. 79-13 Date: June 25, 1979 Page 1 of 4 CPACKING IN FEEDWATER SYSTEM PIPING Description 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 we re inantified in the 16-inch feedwater elbows adjacent to two steam genera cor nozzle elbow welds.
Subsequent radiographic examination revealed crack ir dications in all eight nteam generator feedwater lines at this location on both Units 1 and 2.
On May 25, 1979, a letter was sent to all PWR licens ees by the Office of Nuclear Reactor Regulation which informed licensees of the D. C. Cook failures and requested specific information on feedwater syrtem design, fabrication, inspection and operating histories. To further explore the generic nature of the cracking problem,-the Office of Inspection and Enforcecent 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 Juce 18, 1979, that radiography has shown cracking in their Beaver Valley Unit 1 feedwater piping to vessel nozz1c 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 examiation. As af 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 configura*inne fot D,C Cont and fnr San.0nof te. are, joint detail showing the principal crq{ DUPLICATE DOCUMENT shown on the attached Figures 1 and 2
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are shown on the attached Figure 3.
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Entire document previously entered On ";rch 17, 1977, during heat-up for into system undcr:
q Unit 1, a leak was discovered in the ri c
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