ML18046A516
| ML18046A516 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 03/16/1981 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Hoffman D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| References | |
| TASK-03-04.B, TASK-3-4.B, TASK-RR LSO5-81-03-037, LSO5-81-3-37, NUDOCS 8103230512 | |
| Download: ML18046A516 (8) | |
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Docket No. 50-255 LS05-81-03-037 Mr. David P. Hoffman MARCH 1 G 1981 Nuclear Licensing Administrator Consumers Power Company 1945 W Parnall Road Jackson, Michigan 49201
Dear Mr. Hoffman:
SUBJECT:
PALISADES - SEP TOPIC III-4.B, TURBINE MISSILES This letter is to advise you that Topic III-4.B, Turbine Missiles has been made generic for reasons given in the enclosure.
This matter will be handled as part of the solution to the multi-plant generic cracking problem applicable to all plants with ~Jestinghouse low pressure turbines.
Enclosure:
As stated cc w/enclosure:
See next page 8103230 b\\~
p Sincerely, Original signed b~
Dennis M. Crutchfield Dennis M. Crutchfield, Chief Operating Reactors Branch No. 5 Division of Licensing
- See previous yellow for additional concurrences.
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Docket No. 50-255 Mr. David P. Hoffman Nuclear Licensing Admi ni st rat or Consumers Power Company 1945 W Parnall Road Jackson, Michigan 49201
Dear Mr. Hoffman:
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SUBJECT:
PALISADES - SEP TOPIC III-4.B, TURBINE MISSILES This letter is to advise you that Topic III-4.B, Turbine Missiles has been made generic in the Systematic Evaluation Program (SEP) review of your facility for reasons given in the enclosure.
This matter will be handled as part of the solution to the multi-plant generic cracking problem applicable to all plants with Westinghouse low pressure turbines.
Enclosure:
As stated cc w/enclosure:
See next page Sincerely, Dennis M. Crutchfield, Chief Operating Reactors Branch No. 5 Division of Licensing t
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NRC FORM 3'18 110/80) NRCM 0240 OFFICIAL RECORD COPY
- USGPO: 1980-329-824
Docket No. 50-255 LSOS-81-03-037 Mr. David P. Hoffman e
e UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 March 16, 1981 Nuclear Licensing Administrator Consumers Power Company 1945 W Parnall Road Jackson, Michigan 49201
Dear Mr. Hoffman:
SUBJECT:
PALISADES - SEP TOPIC III-4.B, TURBINE MISSILES This letter is to advise you that Topic III-4.B, Turbine Missiles has been made generic for reasons given in the enclosure.
This matter will be handled as part of the solution to the multi-plant generic cracking problem applicable to all plants with Westinghouse low pressure turbines.
Enclosure:
As stated cc w/enclosure:
See next page Sincerely,
~}J/. g d:7!. hd.'1 Dennis M. CrutchfW~
Operating Reactors Branch No. 5 Division of Licensing
Mr. David cc w/enclosure:
M. I. Miller, Esquire Isham, Lincoln & Beale Suite 4200 One First National Plaza Chicago, Illinois 60670 Mr. Paul A. Perry, Secretary Consumers Pm'ler Convany 212 West Michigan Avenue Jackson, Michigan 49201 Judd L. Bacon, Esquire Consumers Power Convany 212 West Michigan Avenue Jackson, Michigan 49201 Myron M. Cherry, Esquire Suite 4501 One IBM Plaza Chicago, Illinois 60611 Ms. Mary P. Sinclair Great Lakes Energy Alliance 5711 Summerset Drive Midland, Michigan 48640 Kalamazoo Public Library 315 South Rose Street Kalamazoo, Michigan 49006 Township Supervisor Covert Township Route 1, Box 10 Van Buren County, Michigan 49043 Office of the Governor (2)
Room l - Capitol Building Lansing, Michigan 48913 Director, Criteria and Standards Di vision Office of Radiation Programs (ANR-460)
U. s. Environmental Protection Agency Washington, D. c. 20460 IJ March 16, 1981
- u. S. Environmental Protection Agency Federal Activities Branch Region V Office ATTN:
EIS COORDINATOR 230 South Dearborn Street Chicago, Illinois 60604 Charles Bechhoefer, Esq., Chairman Atomic Safety and Licensing Board Panel
- u. S. Nuclear Regulatory Commission Washington, D. c. 20555 Dr. George C. Anderson Department of Oceanography University of Washington Seattle, Washington 98195 Dr. M. Stanley Livingston 1005 Cal le Largo Santa Fe, New Mexico 87501 Resident Inspector c/o U. S. NRC P. o. Box 87 South Haven, Michigan
- 49090 Palisades Plant ATTN:
Mr. J. G. Lewis Plant Manager Covert, Michigan 49043 William J. Scanlon, Esquire 2034 Pauline Boulevard Ann Arbor, Michigan _48103
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ENCLOSURE SEP TOPIC III-4.B TURBINE MISSILES The purpose of this topic is to assure that, with respect to potential turbine missiles, all structures, systems and components important to safety either have adequate protection by means of structural barriers or have an acceptably low probability of damage.
Regulatory Guide 1. 115 and 1.117 and Standard Review Plan (SRP) 3.5.1.3 provide guidance on this subject.
As discussed in SRP 3.5.l.3, it is acceptable to perform a probability analysis of damage to safety related structures, systems and components by potential turbine missiles and compare the calculated probability of damage to an acceptable probability.
The analysis includes utilizing the following individual probabilities: (1) the probability of turbine failure leading to the ejection of turbine missiles due to design speed failures and destructive overspeed failures (P1), (2) the probability of strike (P2) and (3) the probability of damage (P3).
SRP 3.5.l.3 gives acceptable values of Pi based on historical turbine data.
During November 1979, the NRC staff became aware of low pressure turbine disc cracking in Westinghouse turbines at several operating plants.
Additional inspections at other plants possessing Westinghouse turbines also indicated cracking thus implying a generic problem applicable to plants with Westinghouse turbines.
Consequently, on February 25, 1980, the NRC issued 50.54(f) letters to utiliti~s with Westinghouse low pressure turbines requesting infor~ation related to this problem.
As a result of the turbine cracking problem, Westinghouse is in the process of revising its probability of turbine failure leading to the ejection of turbine missiles (P1) and their exit energies.
They expect to submit details of these analyses to the Materials Engineering Branch of the NRC staff for review in April 1981.
To more efficiently utilize NRC staff manpower and because the cracking problem is a multi-plant problem generic to all plants with Westinghouse turbines and extending beyond those plants in the Systematic Evaluation Program, we are making generic Topic III-4.B "Turbine Missiles" for those plants possessing Westinghouse low pressure turbines.
The turbine inspection program developed by the Materials Engineering Branch for Westinghouse turbines provides assurance that turbine missile risks will remain acceptably low.
The reasoning is discussed in the staff's letter of February 19, 1980 to the Atomic Safety and Licensing Board concerning the North Anna nuclear power station.
The staff has developed inspection schedules for those plants with Westinghouse turbines operating with cracks based on the ~taff's crack growth model.
UNITED STATES NUCLEAR REGULATORY COMMISSION REGION Ill 799 ROOSEVELT ROAD GLEN ELLYN, ILLINOIS 60137 Docket No. 50-255 Consumers Power Company ATTN:
Mr. J.* D. Selby, President 1945 West Parnall Road Jackson, MI 49201 Gentlemen:
March 16, 1981 This confirms plans discussed between your staff and my staff to meet with members of your organization on March 18, 1981 at 8:30 a.m. (CST) at the Region III office in Glen Ellyn, *Illinois.
The purpose of this meeting is to discuss the January 6, 1981, 125 volt DC battery bank breaker misposition-ing event.
We will gladly discuss any questions you have concerning this matter.
cc:
J. W. Reynolds, Executive Vice President R. W. Montross, Plant Manager R. B. DeWitt, Vice President, Nuclear Operations Mr. D. P. Hoffman, Nuclear Licensing Administrator Central Files Reproduction Unit NRC 20b AEOD Resident Inspector, RIII PDR Local PDR NSIC TIC Ronald Callen, Michigan Public Service Commission Myron M. Cherry, Chicago Sincerely,
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Director
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