ML19254D064
| ML19254D064 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 09/25/1979 |
| From: | Ziemann D Office of Nuclear Reactor Regulation |
| To: | Bixel D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| References | |
| NUDOCS 7910220310 | |
| Download: ML19254D064 (3) | |
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Sep*. ember 25, 1979 Docket No. 50-155 Mr. David Bixel I.uclear Licensing Administrator Consumers Power Company 212 ',,est Michigan Avenue Jackson, Michigan 49201
Dear Mr. Bixel:
RE: BIG ROCK POINT PLANT We are currently reviewing the adequacy of the offsite power systems of nuclear power plants and in particular, the loss of offsite power events at your facility. One aspect of this review conce ns the history of experienced total and partial power outages and attendent voltage or frequency conditions of the grid.
In our review of this matter we have drawn upt the infomation provided to us via Lic...nsee Event Reports and followup letters which you have sent to us. Our review of these reports indicated the loss of offsite power events have occurred at Big Rock Point Plant on January 25, 1972, April 15, 1978, and April 17, 1978. To complete our review of loss of cffsite power events we require the additional infomation concerning the plant offsite grid indicated in the enclosure to thH letter.
Please orovide your response to the attached questions for the Big Rock Poir.t Piant within 90 days of receipt of this letter.
Sincerely, W 1 c>+v&
Dennis L. Ziemann, Chief Operating Reactors Branch #2 Division of Operating Reactors
Enclosure:
Request for Additional Infomation cc w/ enclosure:
See next page 9 C. i
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.e Mr. David Bixel September 25, 1979 cc Mr. Paul A. Perry, Secretary Consumers Power Company 212 West Michigan Avenue Jackson, Michigan 49201 Judd L. Bacon, Esquire
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Consumers Power Company 212 West Michigan Avenue Jackson, Michigan 49201 Hunton & Williams George C. Freeman, Jr., Esquire P. O. Box 1535 Richmond, Virginia 23212 Peter W. Steketee, Esquire 505 Peoples Building Grand Rapids, Michigan 49503 Charlevoix Public Library 107 Clinton Street Charlevoix, Michigan 49720
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ENCLOSURE REQUEST FOR ADDITIONAL INFORMATION LCSS OF 0FFSITE POWER A.
For losses of offsite power where less than all offsite power was lost:
1.
How many circuit's to the offsite network are normally available and how many were lost during the event?
2.
What was the cause of the event?
3.
Why did the other lines not fail when some did fail?
4.
Was any voltage increase or decrease experienced just prior to or during the outage?
If so, please give details, voltages reached, affects, etc.
5.
Was any frequency decay experienced just prior to or during the outage?
If so, please give details, lowest frequency reached, decay rate, affects on equipment operation, etc.
6.
How long was power unavailable from the circuit?
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7.
Date of Event.
B.
For losses.of all offsite power:
1.
How long was the power off? How long for partial recovery?
Please give details.
2.
If turbine trip occurred, how soon after did loss of offsite power occur?
3.
If power was recovered promptly (10 minutes or less), was it due to automatic or manual actions?
4.
Was any voltage increase or decrease experienced just prior to or during the outage?
If so, please give details, voltages reached, affects, etc.
5.
Was any frequency decay experienced just prior to or during the outage?
If so, please give details, lowest frequency reached, decay rate, affects on equipment operation, etc.
6.
Date of Event.
C.
Were there any other loss of offsite power events other than we have listed.?
If so, please give details of each event.9I4 bbb}}