ML20062K857
| ML20062K857 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 08/11/1982 |
| 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 8208180038 | |
| Download: ML20062K857 (2) | |
Text
g.
BALTIM ORE GAS AND ELECTRIC CHARLES CENTER P. O. BOX 1475 BALTIMORE, MARYLAND 21203 AmrHun E. LUNDVALL. Ja.
August 11,1982 Vacc Pats ot M SuppLv 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 Clarification of Response to NUREG-0737, Item II.K.3.25 Effect of Loss of Alternating Current on Pump Seals
Reference:
Letter from A. E. Lundvall, Jr. to R. A. Clark (NRC), dated July 22, 1982 (same subject)
Gentlemen:
The purpose of this letter is to clarify a statement contained in the referenced letter:
"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."
Some confusion has arisen because several individuals have inferred from this that a containment isolation signal would not isolate component cooling water (CCW) to the reactor coolant pumps (RCP). We apologize for the ambiguity which permits this conclusion; however, this does not affect the conclusion in the referenced letter that the CCW system is capable of supplying cooling water to the RCP seal coolers in the event of a loss of offsite power. We therefore withdraw the offending paragraph and offer the following more precise statement:
"We have reviewed the CCW system valve alignment and have verified that cooling water can be delivered to the RCP seal coolers in the event of a loss of offsite power. In the extremely unlikely event of containment isolation concurrent with a loss of offsite power, CCW flow to the RCP seal coolers would be temporarily interrupted until the containment isolation signal (CIS) could be manually reset. In any case
/
the reactor coolant pumps would not be operational during a loss of OYO offsite power event, thereby greatly reducing the need for providing 1
8208180038 820811 DR ADOCK 05000
-o Mr. R. A. Clark August 6, 1982 If you should have any questions concerning this matter please contact us.
Very truly yours, j
d
1
~
/
( ~ f.
n.,le.e 4U fl
~
AEL/BSM:gvg cc:
J. A. Biddison, Jr., Esquire G. F. Trowbridge, Esquire Mr. D. H. Jaffe - NRC Mr. R. E. Architzel - NRC