ML20063G835
| ML20063G835 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 07/22/1982 |
| From: | Lundvall A BALTIMORE GAS & ELECTRIC CO. |
| To: | Clark R Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-2.K.3.25, TASK-TM NUDOCS 8207290218 | |
| Download: ML20063G835 (2) | |
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BALTIM O RE GAS AND-ELECTRIC CHARLES CENTER P.O. BOX 1475. BALTIMORE, MARYLAND 21203 ARTHUR F. LUNDVALL, Jn.
vict PatslotNT SvPPtv July 22,1982 Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Attn:
Mr. Robert A. Clark, Chief Operating Reactors Branch #3 Division of Licensing
Subject:
Calvert Cliffs Nuclear Power Plant Units Nos.1 & 2; Dockets Nos. 50-317 and 50-318 NUREG-0737, Item II.K.3.25 Effect of Loss of Alternating Current on Pump Seals Gentlemen:
Item II.K.3.25 of NUREG-0737, as applied to Calvert Cliffs Units 1 & 2, requires that we determine the consequences of a loss of cooling water to the reactor coolant pump seal coolers. Item II.K.3.25 further states that the pump seals should be designed to withstand a complete loss of alternating-current power (in this case loss of I
offsite power) for at least two hours. This letter documents our conformance with the requirement.
In the Calvert Cliffs design cooling water for the reactor coolant pump (RCP) seal coolers is supplied by the component cooling water (CCW) system. The CCW system t
for each unit consists of three motor-driven component cooling water pumps, two component cooling heat exchangers, a head tank, and associated valves, piping, and instrumentation.
The CCW pump motors are supplied from two separate 480 volt engineered safety feature buses, with a third motor having two breakers, one from each bus. This arrangement ensures that two pumps are available at all times. If a loss of offsite power occurs, the pumps can be supplied by the emergency diesel generators.
1 We have reviewed the CCW system valve alignment and have verified that cooling water can be delivered to the RCP seal coolers under any conditions that might conceivably accompany a loss of offsite power event; i.e., containment isolation.
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I Mr. R. A. Clark July 22,1982 These CCW ' design features satisfy the requirements stated in Item II.K.3.25.
We therefore consider this item resolved.
If you have any questions on this matter, please contact us.
Very truly yours,
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cc:
- 3. A. Biddison Jr., Esquire G. F. Trowbridge, Esquire Messrs.
D. H. Jaffe - NRC R. E. Architzel - NRC i
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