ML20002B170
| ML20002B170 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 10/24/1980 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Hoffman D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| References | |
| NUDOCS 8012110009 | |
| Download: ML20002B170 (4) | |
Text
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NUCLEAR REGULATORY COMMISSION o
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October 24, 1980 Docket No. 50-155 g
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Mr. David P. Hoffman Nuclear Licensing Administrator
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3 Es Consumers Power Company 5
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5 Jackson, Michigan 49201 au
Dear Mr. Hoffman:
We are continuing our review of the generic issue of onsite power systems for the Big Rock Point Plant and 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, ennis M. Crutchfield, Chi Operating Reactors Branch #5 Division of Licensing
Enclosure:
Request for Additional Information cc w/ enclosure:
see next page 8012140009
i.-a Mr. David P. Hof fman October 24, 1980 CC Mr. Paul A. Perry, Secretary U. 5. Environmental Protection 4
Consumers Power Conpany Agency 212 West Michigan Avenue Federal Activities Branch Jackson, Michigan 49201 Region V Office ATIN:
EIS C0ORDINATOR Judd L. Bacon,' Esquire 230 South Dearborn Street Consumers Power Company Chicago, Illinois 60604 212 West Michigan Avenue Jackson,' Michigan 49201 Herbert Grossman, Esq., Chairman Atomic Safety and Licensing Board Joseph Gallo, Esquire U. S. Nuclear Regulatory Comnission 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. 5. Nuclear Regulatory Comnission 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 Nuclear Power Plant ATIN:
Mr. C. J. Hartman Mr. John O'Neill,11 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 Charlevoix 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 Director, Technical Assessment Mr. Jim E. Mills Division Route 2, Box 108C Office of Radiation Programs Charlevoix, Michigan 49720 (AW-459)
U. S. Environmental Protection Thomas S. Moore Agency Atomic Safety & Licensing Appeal Board l
Crystal Mall #2 U. S. Nuclear Regulatory Comission l
Arlington, Virginia 20460 Washington, D. C.
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Mr. David P. Hof fman October 24, 1980 l-S^
CC Dr.. John H. Buck Atomic Safety and Licensing Appeal Board U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Ms. JoAnn Bier 204 Clinton Street Charlevoix, Michigan 49720
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ENCLOSURE REQUEST FOR ADDITIONAL INFORMATION THE BIG ROCK POINT PLANT DEGRADED GRID VOLTAGE 1.
In Reference a. Item ib, the lowest 480V bus voltage is 413V (0.8608 P.U.) for Bus l A.
What is the voltage.on Bus 2B (safety bus) for this case?
2.
In Reference a, there is a difference between the full load voltages in Item 1 and 5.
Please explain.
- 3. 'In Reference b, Response la, the lowest voltage at the safety bus (28) is stated as being 387V.
In. Reference a, the voltages are higher (423 volts). What is the reason for this difference?
4.
Please explain how the new undervoltage protection system can be classified 'as 1E to meet IEEE Standard 279 when it is located on a non-class lE bus.
5.
Table 1 does not show the setpoint of second level undervoltage relays as stated in Reference a.
The value should have maximur.;
and minimum limits to both voltage and time delay setplints.
6.
Please supply the technical specification changes as called for in the Enclosure 2 of June 3,1977 letter from the NRC.
7.
What is the worst case voltage drop betweer. the lE load buses /
MCCs and the class 1E motors? The Big Rock Point analysis fails to consider the voltage drops.
References a.
CPC letter (D.P. Hoffman) the NRC, dated. August 22, 1980.
b.
CPC letter (W.S. Skibitsky) to NRC (D.L. Ziemann), dated June 14, 1978.