ML19225C613
| ML19225C613 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 07/02/1979 |
| From: | Lainas G Office of Nuclear Reactor Regulation |
| To: | Ziemann D Office of Nuclear Reactor Regulation |
| References | |
| TASK-08-01.A, TASK-8-1.A, TASK-RR NUDOCS 7908010345 | |
| Download: ML19225C613 (3) | |
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UNITED STATES
{ yy,) e.cf( h NUCLEAR REGULATORY COMMISSION 3 Q+W,'.F#/.4% j C
WASHINGTON, D. C. 20555 s, v f !
s JUL 2 1979 MEMORANDUM FOR:
D. Ziemann, Chief, Operating Reactors Branch #2, Division of Operating Reactors FROM:
G. Lainas, Chief, Plant Systems Branch, Division of Operating Reactors'
SUBJECT:
BIG ROCK POINT, REQUEST FOR ADDITIONAL INFORMATION FOR DEGRADED GRID VOLTAGE, (TAC 10008)
Plant Name: Big Rock Point Docket No. : 50-155 Responsible Branch:
ORB #2 Project Manager:
S. Nowicki Reviewing Branch:
Piant Systems Branch Status : Awaiting Information In response to technical assistance request TAC 10008, the Plant Systems Branch has reviewed the licensee's submittal of June 14, 1978, and found that additional information is required in order to complete our review.
The attached request for additional information should be forwarded to the licensee as soon as possible with a request for response within 45 days.
N G. Lainas, Chief Plant Systems Branch Division of Operating Reactors
Contact:
S. Rhow, X28077 C. Cleveland, EG&G
Enclosure:
As stated cc w/ enclosure:
See page 2 400 031 700801 of/f
f
, cc w/ enclosure:
D. Eisenhut R. Vollmer B. Grimes W. Russell G. Lainas S. Nowicki D. Tondi M. Chiramal P. Shemanski S. Rhow C. Cleveland, EG&G f
400 032
REQUEST FOR ADDITIONAL INFORMATION BIG ROCK POINT DEGRADED GRID VOLTAGE (TAC 10008)
- 1. Provide data showing the maximum and minimum voltages reflected at the 480V safety-related bus when the auxiliary systems are being supplied by the:
a.
Station generator b.
138 kV offsite system c.
Backup 46 kV system
- 2. Provide a voltase analysis to justify ycur choice of placing the proposed second level undervoltage protection on the 2400 volt bus as of,osed to the 480 volt safety-related bus.
- 3. Provide the voltage setpoint of the existing undervoltage relays on the 480 volt safety bus and their time delay.
r
- 4. Provide the total elapsed
.,7 from operation of second level under-voltage protection system t > the initiation of the existing under-voltage relays to start the diesel-generator.
- 5. Provide the results of your voltage analysis for the full load and no-load conditions for each bus of the onsite distribution system.
400 03