ML19323E630
| ML19323E630 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 05/01/1980 |
| From: | Varga S Office of Nuclear Reactor Regulation |
| To: | Dunn C DUQUESNE LIGHT CO. |
| References | |
| TAC-13110, NUDOCS 8005270071 | |
| Download: ML19323E630 (4) | |
Text
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MAY I
1980 Docket No. 50-334 Mr. C. N. Dunn, Vice President Operations Division Duquesne Light Company 435 Sixth Avenue Pittsburgh, Pennsylvania 15219
Dear Mr. Dunn:
In our review of your station service bus voltage study we have identified additional information which we will need to continue our review. The enclosure represents our request for that additional information. Your response should be submitted to this office within 45 days.
Sincerely, Y
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arga, C Operating Reactor nch #1 Division of Licensing
Enclosure:
Request for Additional Information cc: w/ enclosure See next page 0 0 5 27 00f[ P 8
Mr. C. N. Dunn Duquesne Light Company cc: Gerald Charnoff, Esquire Mr. James A. Werling Jay E. Silberg, Esquire Plant Superintendent Shaw, Pittman, Potts and Trowbridge Beaver Valley Power Station 1800 M Street, N.W.
P. O. Box 4 Washington, D. C.
20036 Shippingport, Pennsylvania 15077 Karin Carter, Esquire Mr. John A. Levin Special Assistant Attorney General Public Utility Comnission Bureau of Administrative Enforcement P. O. Box 3265 5th Floor, Executive House Harrisburg, Pennsylvania 17120 Harrisburg, Pennsylvania 17120 Mr. J. D. Sieber, Superintendent Mr. Roger Tapan of Licensing and Coupliance Stone and Webster Engineering Duquesne Light Company Corporation Post Office Box 4 P. O. Box 2325 Shippingport, Pennsylvania 15077 Boston, Massachusetts 02107 Irwin A. Popowsky, Esquire Mr. F. Noon Office of Consumer Advocate R & D Center 1425 Strawberry Square Westinghouse Electric Corporation Harrisburg, Pennsylvania.17120 Building 7-303 Pittsburgh, Pennsylvania 15230 B. F. Jones Memorial Library 663 Franklin Avenue Aliquippa, Pennsylvania 10001 Mr. John Carey,' Director Nuclear Operations Duquesne Light Company 435 Sixth Avenue Pittsburgh, Pennsylvania 15219 Mr. R. E. Martin Duquesne Light Company 435 Sixth Avenue Pittsburgh, Pennsylvania 15219 Marvin Fein Utility Counsel City of Pittsburgh 313 City-County Building Pittsburgh, Pennsylvania 15219 l
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ENCLOSURE BEAVER VALLEY (DOCKET NO. 50-334)
QUESTIONS ON ADEQUACY OF STATION ELECTRIC DISTRIBUTION SYSTEM V0LTAGES
References:
a.
Duquesne Light (DL) letter (C.N. Dunn) to NRC, " Response to Requests for Information on Station Service Bus Voltages",
dated October 15, 1979.
b.
NRC generic letter to all Power Reactor Licensees, " Adequacy of Station Electric Distribution System Voltage," dated August 8, 1979.
c.
n! letter (C.N. Dunn) to NRC, " Station Service Bus Voltage Study," dated February 22, 1980.
Questions:
1.
Has testing been done to verify the analysis?a,c DL should supply both the test method and the results per the require-b ments of page 2, paragraph 3,
2.
What are the terminal voltages on low voltage AC (less than 480 V) class lE equipment for each analyzed case. Do these systems supply any instruments or control circuits as required by GDC 13? If so, are all equipment capable of sustaining the analyzed voltages (without blowing of fuses, overheating, etc.)? Is the connected equipment qualified by the manu-facturers to withstand the expected voltages without affecting their ability to perform the required function?
b 3.
DL should provide the review requested in page 2, paragraph 4 of events or conditions which could result in the simultaneous or consequential loss of both required circuits to the offsite grid (to determine if any potential exists for violation of GDC17).
4.
The attachment of reference c, section 3.0 indicates that the 4160 V emergency bus drops to a minimum of 84% and, on the heaviest loaded 480 V emergency bus, the voltage drops to a minimum of 78.5% when starting a 6000 hp reactor coolant pump.
b Per NRC guidelines 3 and 9, compare these voltages with the required terminal voltages, for normal operation of the class lE loads (starters, contactors, and motor). What are the terminal voltages on equipment, 480 V and below when starting the largest 480 V class lE load when all other class lE loads are running?
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1 5.
Prior to installing the capacitor banks, the second paragraph of reference c indicates that a voltage boost by tap change j
of the system station service transformers will be used to i
i prevent unacceptably low voltage levels. Per NRC guideline
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11, DL should provide assurance that this action does not result in excessive voltage levels to the connected equipment.
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