ML20009C755
| ML20009C755 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 07/07/1981 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Hoffman D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| References | |
| LSO5-81-07-008, LSO5-81-7-8, NUDOCS 8107210440 | |
| Download: ML20009C755 (7) | |
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DISTRIBUTION July 7, T981 h
Local PDR ORB Reading Docket No. 50.' 35 LS05-81-07-Ou8 (3)
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Mr. David P. Hoffman Nuclear Licensing Administrator h
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Consumers Power Company ACRS (10)
- si-JUL 151981> H 1945 W. Parnall Road u--
Jackson, Michigan 49201 om mssa
Dear Mr. Hoffman:
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We are continuing our review of adequacy of station electric distribution system voltages and degraded grid protection. Based i
on our review of your submittals of February 3. March 23, and l
May 4,1981 we have found that additional information described in the enclosure to this letter is needed. We request your response within 45 days of your receipt of this letter.
Sincerely, Original sigred by Dennis M. Crutchfield, Chief Operating Reactors Branch #5 Division of Licensing
Enclosure:
Request for Additional Information cc w/ enclosure:
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Mr. David P. Hoffman July 7,1981 n
cc Mr. Paul A. Perry, Secretary U. S. Environmental Protection
. Consumers Power Conpany Agency 212' West Michigan Avenue Federal Activities Branch Jackson, Michigan 49201 Region V Office ATTN: EIS COORDINATOR Judd L. Bacon, Esquire 230 South Dearborn Street Consumers Power Conpany Chicago, Illinois 60604 212 West Michigan Avenue Jackson, Michigan 49201 Herbert Grossmari, Esq., Chairman Atomic Safety and Licensing Board -
Joseph Gallo, Esquire U. S. Nuclear Regulatory Comission 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 Comission 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 Comission Atomic Safety & Licensing Appeal Board Washington, D. C.
20555 U. S. Nuclear Regulatory Comission Washington,'D. C.
20555 Big Rock Point Nuc, lear Power Plant ATTN: Mr. C. J. Hartman Mr. John O'Neill, II Plant Superintendent Route 2. Box 44 Charlevoix, Michigan 49720 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, Michigan 48103 Cnarlevoix County Charlevoix, Michigan 49720 Resident Inspector Big Rock Point Plant Office of the Governor (2) c/o U.S. NRC Room 1 - Capitol Building RR #3, Box 600 Lansing, Michigan 48913 Charlevoix, Michigan 49720 Herberc Semel Mr. Jim E. Mills Council for Christa Maria, et al.
Route 2, Box 108C Urban Law Institute Charlevoix, Michigan 49720 Antioch School of Law 263316th Street, NW Thomas S. Moore Washington, D. C.
20460 Atomic Safety & Licensing Appeal Board j
U. S. Nuclear Regulatory Comission Washington,, D. C.
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July 7,198'1 Mr. David P. Hoffman CC '
Dr. dohn H. Buck '
Atomic Safety and Licensing Appeal Board U. S. Nuclear Regulaton Connission Washington, D. C.. 20555 Ms. JoAnn Bier 204 Clinton Street-
. Charlevoix, Michigan 49720 9
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L REQUEST FOR ADDITIONAL INFORMATION BIG ROCK POINT PLANT,
Docket No. 50-155 DEGRADED GRID ADEQUACY OF STATION ELECTRIC DISTRIBUTION SYSTEM VOLTAGES
References:
.l.
NRC letter to CPCo, June 3, 1977 2.
NRC letter, W. Gammill to All Power Reactor Licensees (Except Humboldt.
Bay), " Adequacy of Station Electric Distribution Systems Voltages",
August 8, 1979.
3.
CPCo letter, D. P. Hoffman to D. M. Crutchfield, NRC, February 3,1981.
4.
CPCo letter, D. P. Hoffm=n to Director, Nuclear Reactor Regulation, NRC,
" Adequacy of-Station Electric Distribution Systems Voltages", March 23, 1981.
5.
CPCo letter, G. C. Withrow to Director, Nuclear Reactor Regulation, NRC,.
" Generic Issue - Adequacy of Station Electric Distribution Voltages",
May 4, 1981.
The NRC requested a second-level undervoltage protection systemIII and an analysis that shows the adequacy of the offsite power sources in conjunction with the onsite distribution system for supplying power to the class lE equip-ment under extreme combinations of grid voltage and unit loads (2),
Consumers Power Company (CPCo) has responded to reference 1 with a letter 53I dated February 3,1981 and with prior submittals. CPCo has responded to reference 2 with letters dated March 23, 1981 I4) and May 4,1981(5). and with prior submittals.
i To complete our review, supply the following:
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1.
Your technical specifications do nct conform with the model technical UI specifications in the following areas.
a.
There is no time limit on a channel in the tripped position when it is removed from service.
- b. _There is no requirement for a monthly channel functional test.
c.
Second-level undervoltage relay setpoints, time delays and allowable limits (+ tolerances) are not called out.
Either provide the above items in your technical specifiestions or justify why each item should not be required.
In particular, justify use of the three-out-of-three logic without frequent channel functiona. tests.
2.
Describe the possible failure modes of the second-level undervaltage relay channel and components. Specifically, are there single failures that could negate the channel function?
3.
On DWG WD740 SH 1 you show a generator breaker.
Is this device a load break switch or is it a breaker designed to interrupt the maximum generator and system fault currents? If this is a generator breaker supply the design criterion and testing used to qualify _ the breaker for this service. Will this breaker trip on a turbine trip and allow the 138 kv supply to automatically backfeed the station loads or is operator action required to make this source available as a dela:ted source of offsite power.
4.
Supply the ratings for continuous operation of the class lE starters (nominal coil voltage, maximum and minimum coil voltages and transformer ratios).
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Suphlythevoltageratings(nominal,maximumandminimum)fortheinstru-
'5 ments and control systems connected to the class 1E system. What is the maximum expected voltage for this equipmen't?' CPCo has, indicated that there may be occasions when this equipment i's su'bjected to undervoltage I4I.. Describe how these voltages will be improved.
conditions 6.
Per telecon of June 4, 1981, the previously provided minimum expected grid voltage may be lower than needed to assure conservatism. Provide new analysis and justification for the new grid voltage as appropriate (see also item 5).
7.
Supply the maximum expected grid voltages for the 138kV and for the 46kV grids.
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