ML20003C421
| ML20003C421 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 01/27/1981 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Hoffman D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| References | |
| NUDOCS 8103050318 | |
| Download: ML20003C421 (5) | |
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a;f-i ms Docket No. 50-155
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-j Mr. David P. Hoffman 2/
Nuclear Licensing Administrator I,
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Consumers Power company g
212 West Michigan Avenue
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Dear Mr. Hoffman:
We are continuing our review of the generic issue of the adequacy of station electric distribution system voltages for the Big Rock Point Plant and have found that additional information described in the enclo-l 4
sure to this letter is needed. We request your response within 45 days i
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of your receipt of this letter.
Sincerely,
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- i Dennis M.' Crutchfield, Chief Operating Reactors Branch #5 Of vision of Licensing f
Enclosure:
Request for Additional Information UTION f
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%, ' v j' January 27, 1981 Docket No'. 50-155 LS05-01-01 -041 Mr. David P. Hoffman Nuclear Licensing Administrator Consumers Power Company 212 West Michigan Avenue Jackson, Michigan-49201
Dear Mr. Hoffman:
We are continuing our review of the generic issue of the adequacy of station electric distribution system voltages for the Big Rock Point Plant and have found that additional information described in the enclo-sure to this letter is n'eded. We request your response within 45 days of your receipt of this letter.
Sincerely,
/
Dennis M. Crutchfield, hief Operating Reactors Bra ch #5 -
Division of Licensing
Enclosure:
Request -for Additional Information cc w/ enclosure:
See next page i
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,Mr. David P. Hoffman January 27, 1981 4
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Mr. Paul A. Perry, Secretary V. S. Environmental Protection Consumers Power Comany 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 Pcwer Cogany Chicago, Illinois 60604 212 West Michigan Avenue 3
Jackson, Michigan 49201 4erbert Grossman, 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 l'
Washington, D. C.
20036 Atomic Safety and Licensing Board U. S. Nuclear Regulatory Comission Peter W. Steketee, Esquire Washington, D. C.
20S55 505 Peoples Building l
Grand Rapids, Michigan 49503 Mr. Frederick J. Shon I
Atomic Safety and Licensing Board Alan S. Rosenthal, Esq., Chairman U. S. Nuclear Regulatory Comission j
Atcmic Safety & Licensing Appeal Board Washington, D. C.
20555 U. S. Nuclear Regulatory Comission 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 49720 Maple City, Michigan 49664 j
Christa-Maria Charlevoix Public Library Route 2, Box 108C 107 Clinton Street Charlevoix, Michigan 49720 Charlevoix, Michigan j
William J. Scanlon, Esquire Chairma n 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 Rocm 1 - Capitol Eailding RR #3, Box 600 Lansing, Michigan 48913 Charlevoix, Michigan 49720 Director, Criteria and Standards Mr. Jim E. Mills Division Route 2, Box 108C Office of Radiation Programs Charlevoix, Michigan 49720 (ANR-460)
U. S. Environmental Prctection Thomas S. Moore Agency Atomic Safety & Licensing Appeal Board Washington, D. C.
20450 U. S. Nuclear Regulatory Comission Washington, D. C.
20555
4 Mr. David P. Hoffman
- January 27, 1981 s
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cc Dr. John H. Buck Atomic Safety and Licensing Appeal Board l
l U. S. Nuclear Regulatory Comission Washington, D..C.
-20555.
j Ms.' JoAnn Bier i
204 Clinton Street Charlevoix, Michigan 49720 i
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e BIG ROCK POINT Docket No. 50-155 REQUEST FOR ADDITIONAL INFORMATION ON ADEQUACY OF STATION ELECTRIC DISTRIBUTION SYSTEM VOLTAGES
References:
a.
NRC generic letter to all Pcwer Reactor Licensees, " Adequacy of Station Electric Distribution Systems Voltages," dated August 8,1979.
i b.
CPCo letter, David P. Hoffman, to Director, Nuclear Reactor Regulation, U.S. NRC, "Respense to Generic Issues--Adequacy cf Station Electric Distribution System Voltages," August 29, 1980.
CPCo letter, David P. Hoffman, to Director, Nuclear Reactor Regulation, c.
U.S. NRC, " Response to Generic Issue--Degraded Grid Voltage,"
Au g'u s t 21, 1980.
d.
CPCo letter, William 5. Skibitsky, to Director, Nuclear Reactor Regu-latien, U.S. NRC, "On-site Emergency Power Sources," June 14, 1978.
1.
For each previously analyzed case (ref, b, c & d) and for the analyses required by the following questions, please supply the calculated voltages and the voltage ratings for all low-voltage AC (less than 480v) Class lE equipment (including the alternate source for any motor-generators er inverters).
Do these systems supply any instruments or control circuits as required by GDC 13?
If so, is all the equipment capable of sustaining the an&lyzed voltages without bicwing fuses, overheating, etc., and without affecting the equipment's ability to perform the required function?
2.
Are the analyzed cases for MCC 2A feeding Class lE MCC 2B worse than MCC 1 A feeding MCC 2B? If not, provide the required analyses for the alternate (MCC 1A) feed.
3.
Provide,in percent of maximum bus loading, the loading of the buses as measured in your test verification (ref, b, attachment II).
What are the
test reasurement accuracies (including instrumentation and potential j
transformer accuracies)?
i 4.
Are the voltages supplied in your response to Item 1 (ref. c) derived from the same computer simulation (Pil61) that your testing (ref. b) verified?
If they are not, provide a steady state voltage analysis that has been verified by a test.
In either case describe the loads for the analyced conditions.
4
- t-5.
The continuous operating voltage range for the Big Rock Point safeguards equipment is supplied by reference d.
What are the transient operating l
voltage ratings (i.e., rated starting and stall voltages) for this equipment?
Khat are the voltage ratings for your Class lE motor contactors and starters?
i 4
4 I
6.
Your response to guideline 1 (ref, b, attachment I) provides two analyses, one for starting a reactor feed pump with the 135kv source, the other for starting a fire pump with the 46ky source.
Is each the worse case for i
that source? If not, supply the worst case analysis for the source.
Identify the duration of these transient conditions.
i 7.
It is not clear from Figure 1 (ref. b) whether transformer No. 77 is a j
- ossible source of power to tne 2400v switchgear bus or a load on that bus.
Describe the connections of this transformer at the service building.
If j
this is a possible power source, provide the analyses required by reference (a)and the above questions.
If this is not a source, are the effects of tris connection reflected in your analyses for the 46kv source?
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