ML20083J105
| ML20083J105 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 01/06/1984 |
| From: | Carey J DUQUESNE LIGHT CO. |
| To: | Eisenut D Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-2.K.3.17, TASK-TM GL-81-04, GL-81-4, GL-83-41, NUDOCS 8401160178 | |
| Download: ML20083J105 (2) | |
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January 6,1984 Shippingport, PA 15077-0004 Director of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commissicn Attn:
D. G. Eisenhut, Director Division of Licensing Washington, DC 20555
Reference:
Beaver Valley Power Station, Unit No.1 Docket No. 50-334, License No. DPR-66 Response to Generic Letter 83-41 Centicmen:
The Beaver Valley Power Station, Unit 1 Technical Specifications for the emergency diesel generator requires a 31-day, staggered basis, start and an 18-month fast start from ambient condition to synchronous speed, energizing the permanent and autc-connected emergency bus loads.
1.
Beaver Valley 1 has had a total of eight diesel generator fast starts during the period of December 1,1982 to December 1,1983.
Train A Train B Surveillance Test 1
1 Maintenance Activitics Actual Demands with 2
2 Emergency Bus Leads supplied by Diesel
- Additional fast starts i
l due to SIS actuation In addition to the fast starts, the Train A diesel generator has been started 15 times and the Train B has been started 16 times as a result of surveillance and maintenance acti-vities.
2.
Duquesne Light believes that frequent fast starts of the diesel generator degrades reliability and availability due to:
excessive equipment cycling, on breakers, relay ccntacts, shaft driven components increased mechanical wear, on bearings and stresses imposed by fast starting and loading of the diesel.
LER 83-02, LER 83-16 Train A LER 83-15, LER 83-20 Train B None of these incidents resulted in concurrent losses of power to both emergency busses and power was restored in a relatively short period of time.
$b hD ADO O O O 34 sf
[E P
l B:av;r Vall;y Power Station, Unit ND.1 Docket No. 50-334, Licens No. DPR -
Response to Generic Letter 83-41 Page 2 Additional infonnation on Beaver Valley 1 diesel generators is
- available in our responses to Generic Letter 81-04,' November 30, 1981 and NUREG-0737 II.K.3.17, August 3,1982.
We' believe that fast starts should be limited to once per 18 months with the diesel supplying the emergency bus providing that historically, the particular grid stability has proven reliability.] Specifically, events which have resulted in concurrent losses of Non-IE power to both emergency busses should be used as the screening criteria to detennine if fast starting test frequencies must be increased.
If you have any questions on this response, please contact our Nuclear Safety and Licensing Department directly.
Very truly yours,
/
J. J. Carey Vice President, Nuclear cc: Director of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Attn: Mr. Steven A. Varga, Chief Operating Reactors Branch No. 1 Division of Licensing Washington, DC 20555 Mr. W. M. Troskoski, Resident Inspector U. S. Nuclear Regulatory Commission Beaver Valley Power Station Shippingport, PA 15077 U. S. Nuclear Regulatory Commission c/o Document Management Branch Washington, DC 20555 Director, Safety Evaluation & Control Virginia Electric & Power Company P.O. Box 26666 One James River Plaza Richmond, VA 23261