ML19323F351
| ML19323F351 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 05/16/1980 |
| From: | Ippolito T Office of Nuclear Reactor Regulation |
| To: | Jackie Jones CAROLINA POWER & LIGHT CO. |
| References | |
| NUDOCS 8005280823 | |
| Download: ML19323F351 (3) | |
Text
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NUCLEAR REGULATORY COMMISSION 7 E
.:. C WASHINGTON, D. C. 20555
's May 16,1980 Docket flos. 50-325 and 50-324 Mr. J. A. Jones Senior Executive Vice President Carolina Power & Light Company 336 Fayetteville Street Raleigh, North Carolina 27602
Dear Mr. Jones:
We are reviewing your submittal of October 8,1979, regarding the adequacy of station electrical distribution systems voltage. We find that we need additional information requested in the enclosure in order to complete our evaluation. This enclosure was previously forwarded to you by facsimile service on April 1,1980.
To enable us to maintain a review schedule consistent with the original request dated August 8,1979, please provide your response within 60 days of the date of this letter.
Sincerely, P-4 1
Chief Operating Reactors Branch #2 Division of Licensing
Enclosure:
Request for Additional Information Regarding the Adequace of Station Electrical Distribution Systems Voltage cc w/ enclosure:
See next page s o o5 280D3
?
b Mr. J. A. Jones Carolina Power & Light Company May 16,1980 i
cc:
Richard E. Jones Esquire Carolina Power & Light Company 336 Fayetteville Street Raleigh, North Carolina 27602 George F. Trowbridge, Esquire Shaw, Pittnan, Potts & Trowbridge 1800 M Street, N. W.
Washington, D. C.
20036 John J. Burney, Jr., Esquire Burney, Burney, Sperry & Barefoot 110 North Fifth Avenue Wilmington, North Carolina 28401 Resident Inspector U. S. Nuclear Regulatory Commission P. O. Box 1057 Southport, North Carolina 28461 Southport - Brunswick County Library 109 W. Moore Street Southport, North Carolina 28461 Mr. Fred Tollison Plant Manager P. O. Box 458 Southport, North Carolina 28461
REQUEST FOR ADDITI0tlAL It.F0FJtATI0fl Oil BRUtiSWICK STEA!1 ELECTRIC PLA!1TS UtlITS 1 AND 2 REGARDIllG THE ADEQUACY OF STATIO1 ELECTRICAL DISTRIBUTIO!1 SYSTE!45 VOLTAGE 1.
Your letter dated October 25, 1976 calls for the switchyard voltage to be maintained between 98% and 102%, and your letter of October 8,1979 gives the switchyard operating voltage range as 94.5% to 101% and states that the voltage had not fallen below 98%.
In your study you have used taps to keep the voltage at 230 KV and have used grid voltages of 95%
and 105". for analysis.
However, we want to find out the minimum and r.aximum grid voltages according to guideline number six.
2.
The flRC guidelines for voltage drop calculations, in general, request that the minicum and maximum voltages be calculated and analyzed "at the terminals of each safety load". The analysis in your October 8,1979 submittal does not include safety loads below the 480 volt level (instrumenta-tion, controls,etc.).
Please provide this analysis.
1.
3.
The one-line electrical diagram from the Brunswick FSAR (8.10-1) shows 4160 and 480 volt tie breakars between unit 1 and unit 2; therefore; it would be possible to supply all normal operating and shutdown loads to both plants from one SAT.
I.1 order to ccnform to the llRC guidelines for voltage drop calculations, item 2, this possibility should be considered in your analysis, and it appears that it was not. Please provide analysis of one SAT supplying all loads to both plants.
4.
The flRC guidelines for voltage drop calculations, item 8, states that "The analysis shculd document the voltage setpoint and any inherent or adjustable (with nominal setting) time delay for relays which initiate or execute (1) automatic transfer of loads from one source to another; (2) automatic load shedding; or (3) automatic load sequencing". Please provide these settings.
5.
In order to validate your analysis, the voltages obtained in your onsite test should be compared directly with your analysis.
Do you intend to do this?