ML20030D646

Recommends That Licensee Continue to Perform Low Pressure Turbine Disc Insps for Stress Corrosion Cracking & Continue to Work W/Ge to Establish Safe Insp Schedule

ML20030D646
Person / Time
Site:	Big Rock Point File:Consumers Energy icon.png
Issue date:	08/27/1981
From:	Crutchfield D Office of Nuclear Reactor Regulation
To:	Hoffman D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
References
LSO5-81-08-057, LSO5-81-8-57, NUDOCS 8109140117
Download: ML20030D646 (3)

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DISTRIBUTION August 27, 1981 Docket NRC PDR Local PDR NSIC TERA Docket 11o. 50-155 ORB Reading LS05-.81 057 DCrutchfield HSmith Ar 0) s Mr. David P. Hoffman E (3)

[8 hj Nuclear !.icensing Administrator SEPB 6-Consux$rs Power Company WRoss O

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Jackson, Michigan 49201 4 @-

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SUBJECT:

TURBINE DISC CRACKIllG (BIG ROCK POINT PLANT)

(Task Action No. B-46)

In our letter of May 1980 we recoceended that you initiate a program to inspect the keyway and bore areas of your low pressure discs for stress corrosion cracking. This action was prompted by the discovery of such cracks in Westinghouse turbines.

So far, the inspection progran has covered one or more low pressure rotors at 15 nuclear plants using GE turbines. No clear indication of stress corrosion cracking has been discovered, although indications of water cutting and/or erosion have been observed in several turbines.

In view of these findings, we have decided to discontinue the NRR staff monitoring of these inspectior.c.. Normal activities of the Office of Inspection and Enforcement will continue of course.

We recomend that you continue to perform disc inspections, as appropriate, and continue to work with General Electric Company to establish safe inspection schedules. Should you find any significant degradation, such as stress corrosion cracking, we would expect you to promptly report it in the normal manner.

Sincerely.

ORIGINAL SIGNED BY l10914o317010G27 Dennis H. Crutchfield, Chief R ADocM 05000155 Operating Reactors Branch #5 G

PDR Division of Licensing cc: See next page h

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Mr. David P. Hoffman August 27, 1981 CC Mr. Paul A. Perry, Secretary U. S. Environmental Protection - ~

Consumers Power Company Agency 212 West Michigan Avenue Federal Activities Branch Jackson, Michigan 49201 Region V Office ATTN: Regional Radiation Representative Judd L. Bacon, Esquire 230 South Dearborn Street Consumers Power Company Chicago, Illinois 60604 212 West Michigan Avenue Jackson, Michigan 49201 Herber,t Grossman, Esq., Chairman Atomic Safety and Licensing Board Joseph Gallo, Esquire U. S. Nuclear Regulatory Commission Isham, Lincoln & Beale Washington, D. C.

20555 1120 Connecticut Avenue Room 325 Dr. Oscar H. Paris Washington, D. C.

20036 Atomic Safety and Licensing Board U. S. Nuclear Regulatory Commission Peter W. Steketee, Esquire Washington, D. C.

20555 505 Peoples Building Grand Rapids, Michigan 49503 Mr. Frederick J. Shon Atomic Safety and Licensing Board Alan S. Rosenthal Esq., Chairman U. S. Nuclear Regulatory Commission Atomic Safety & Licensing Appeal Board Washington, D. C.

20555 U. S. Nuclear Regulatory Commission Washington, D. C.

20555 Big Rock Point Nuclear Power Plant ATTN: Mr. C. J. Hartman Mr. John O'Neill, II Plant Superintendent Route 2, Box 44 Charlevoix, Michigan 49710 Maple City, Michigan 49664 Christa-Maria Charlevoix Public Library Route 2, Box 108C 107 Clinton Street Charlevoix, Michigan 49720 Charlevoix, Michigan William J. Scanlon, Esquire Chairman 2034 Pauline Boulevard County Board of Supervisors Ann Arbor, Michigaq 48103 Charlevoix County Charlevoix, Michigan 49720 Resident Inspector Big Rock Point Plant Office of the Governor (2) c/o U.S. NRC#

Room 1 - Capitol Butiding RR #3, Box 600 Lansing, Michigan 48913 Charlevoix, Michigan 49720 i

Herbert Sensel Mr. Jim E. Mills Council for Christa Maria, et al.

Route 2, Box 108C U ban Law Institute Charlevoix, Michigan 49720 Ant,uch School of Law 263316th Street, NW Washington, D. C.

20460

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Mr. David P. Hoffman 3-August 27, 1981

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Dr. John H. Buck i

Atomic Safety and Licensing Appeal Board U. S. Nuclear Regulatcry Comission Washington, D. C.

20555 Ms. JoAnn Bier 204 Clinton Street Charlevoix, Michigan 49720 Thomas S. Moore Atomic Safety and Licensing Appeal Board i

U. S. Nuclear Regulatory Comission Washington, D. C.

20555 4

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