ML18054B363
| ML18054B363 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 01/11/1990 |
| From: | De Agazio A Office of Nuclear Reactor Regulation |
| To: | Berry K CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| References | |
| PAL-90-005, PAL-90-5, TAC-71851, NUDOCS 9001180240 | |
| Download: ML18054B363 (3) | |
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Docket No. 50-255 Serial No. PAL-90-005 Mr. Kenneth W. Berry Director, Nuclear Licensing Consumers Power Company 1945 West Parnall Road Jackson, Michigan 49201
Dear Mr. Berry:
January 11, 1990 DISTRIBUTION:
Docket File NRC & Local PDRs PD31 Reading JZwolinski PShuttleworth ADeAgazio OGC EJordan ACRS (10)
PD plant-service file (Gray File)
SUBJECT:
STEAM GENERATOR TUBE CRACK GROWTH DURING A STEAM LINE BREAK (TAC 71851)
On May 22, 1989, Consumers Power Company submitted an evaluation of the potential for an existing circumferential tube crack to grow to a critical size as a result of a steam-line break. This evaluation was requested by the NRC because of concerns arising from recent occurrences of such cracking at support plate locations in the Palisades Plant steam generators.
The maximum crack size observed at the Palisades Plant at the time the analysis was performed was less than 90 degrees of tube circumference.
The CPCo analysis concludes that the maximum crack size that can exist in the steam generator without bursting during a steam-line break is 187 degrees of tube circumference.
CPCo has concluded that the critical crack size is much larger than the expected crack size; therefore, a steam-line break is not expected to result in tube rupture.
CPCo has fulfilled its commitment to the NRC with the submittal of this analysis. Because of CPCo's decision to replace the steam generators in the Fall of 1990, we do not plan a detailed review of the submittal.
No further staff action on this issue is planned.
Sincerely, Original signed by Albert W. De Agazio, Sr. Project Manager Project Directorate III-1 Division of Reactor Projects - III, IV, V & Special Projects Office of Nuclear Reactor Regulation cc:
See next page PM/PD31. 6?{!~
ADEAGAZIO
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 Docket No. 50-255 Serial No. PAL-90-005 Mr. Kenneth W. Berry Director, Nuclear Licensing Consumers Power Company 1945 West Parnall Road Jackson, Michigan 49201
Dear Mr. Berry:
January 11, 1990
SUBJECT:
STEAM GENERATOR TUBE CRACK GROWTH DURING A STEAM LINE BREAK (TAC 71851)
On May 22, 1989, Consumers Power Company submitted an evaluation of the potential for an existing circumferential tube crack to grow to a critical size as a result of a steam-line break. This evaluation was requested by the NRC because of concerns arising from recent occurrences of such cracking at support platf locations in the Palisades Plant steam generators.
The maximum crack size observed at the Palisades Plant at the time the analysis was performed was less than 90 degrees of tube circumference.
The CPCc a~alysis concludes that the maximum crack size that can exist in the steam generator without bursting during a steam-line break is 187 degrees of tube circumference.
CPCo has concluded that the critical crack size is much larger than the expected crack size; therefore, a steam-line break is not expected to result in tube rupture.
CPCo has fulfilled its commitment to the NRC with the submittal of this analysis.
Because of CPCo's decision to replace the steam generators in the Fall of 1990, we do not plan a detailed review of the submittal.
No further staff action on this issue is planned.
cc:
See next pagc Sincerely, Albert W.
e Agazio, Sr.
Project Directorate III-1 Division of Reactor Projects - III, IV, V & Special Projects Office of Nuclear Reactor Regulation
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Mr. Kenneth W. Berry Consumers Power Company cc:
M. I. Miller, Esquire Sidley & Austin 54th Floor One First National Plaza Chicago, Illinois 60603 Mr. Thomas A. McNish. Secretary Consumers Power Company 212 West Michigan Avenue Jackson, Michigan 49201 Judd L. Bacon, Esquire Consumers Power Company 212 West Michigan Avenue Jackson, Michigan 49201 Regional Administrator, Region III U.S. Nuclear Regulatory Co11111ission 799 Roosevelt Road Glen Ellyn, Illinois 60137 Jerry Sarno Township Supervisor Covert Township 36197 M-140 Highway Covert, Michigan 49043 Offic~ of the Governor Room 1 - Capitol Building Lansing, Michigan 48913 Mr. Gerald B. Slade Plant General Manager Palisades Plant 27780 Blue Star Memorial Hwy.
Covert, Michigan 49043 Resident Inspector c/o U.S. Nuclear Regulatory Co11111ission Palisades Plant 27782 Blue Star Memorial Hwy.
Covert, Michigan 49043 Palisades Plant Nuclear Facilities and Environmental Monitoring Section Office Division of Radiological Health P.O. Box 30035 Lansing, Michigan 48909