ML19257A512
| ML19257A512 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 12/27/1979 |
| From: | Lundvall A BALTIMORE GAS & ELECTRIC CO. |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8001040534 | |
| Download: ML19257A512 (2) | |
Text
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BALTIMORE G AS AND ELECTRIC COMPANY P.O. BOX 147 5 B ALTIM O R E. M A R YL AN D 21203 ARTHum C. LuMOVALL,JR.
""7E""
December 27, 1979 s
Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D. C.
20555 ATTENTION: Mr. Darrell G. Eisenhut, Acting Director Division of Operating Reactors
SUBJECT:
Calvert Cliffs Nuclear Power Plant Unit No. 1, Docket No. 50-317 Unit No. 2, Docket No. 50-318 ECCS Flow Blockage Model
REFERENCE:
(a) NRC Lei.ter, D. G. Eisenhut to All Operating Light Water Reactors, Dated November 9, 1979.
(b) Letter, LD-79-064, A. E. Scherer to D. G. Eisenhut, Dated November 2, 1979.
(c) Letter, LD-79-067, A. E. Scherer to D. G. Eisenhut, Dated November 16, 1979.
Gentlemen:
Reference (a) requires all licensees to confirm that information regarding fuel cladding swelling and rupture presented by their fuel supplier on their behalf is correct within sixty days of the date of Reference (a). Due to the reasons presented below, the requested response will not be ready within this time frame, and an extension. to February 1, 1980, is requested.
As stated in References (b) and (c), Combustion Engineering, Inc. (CE) did not state that the fuel cladding strain and assembly flow blockage models used in ECCS analysis for CE operating plants are as conservative as the staff models. Despite this, CE believes that all plants can still be shown g
to have peak cladding temperatures below 2200 F without any decrease in peak linear heat rates. CE believes they can accomplish this by combining their Evaluation Model with their newly developed reflood heat transfer model which has already been reviewed satisfactorily by the NRC staff.
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Office of Nuclear Reactor Regulation December 27, 1979 Page 2 CE will require six (6) calendar weeks to complete this analysis. Due to correspondence delays { Reference (a) did not reach the plant site until early December}, CE did not start their analysis until mid December and will not complete it until late January. Therefore, as a result of the additional analysis and correspondence delays, it is requested that the submittal date be extended to February 1, 1980.
If you have any questions, please do not hesitate to contact us.
Very truly yours.
., 3-f u t A. E. Lundvall, Jr.
Vice President - Supply AEL/ JAM /mrc 1685 030