ML20126D695
| ML20126D695 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 12/18/1992 |
| From: | Denton R BALTIMORE GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20126D698 | List: |
| References | |
| NUDOCS 9212280112 | |
| Download: ML20126D695 (2) | |
Text
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BALTIMORE.
GAS AND i
ELECTRIC 1650 CALVERT CLIFFS PARKWAY. LUSBY, MARYLAND 20657-4702 RoPERT E. DENTON Vict PRE $1 DENT NUCLE AR ENER0Y (410)400-44SS December 18,1992 U. S. Nuclear Regulatory Commission Washington,DC 20555 ATTENTION:
Document Control Desk
SUBJECT:
Calvert Cliffs Nuclear Power Plant Unit Nos.1 & 2; Docket Nos. 50-317 & 50-318 Emcreency Diesel Gencedor Proicet - Civil Encincerine Desien Report
REFERENCES:
(a)
Letter from Mr. D. G. Mcdonald, Jr. (NRC) to Mr. G. C. Creel (BG&E), dated October 10,1990, Response to Station Blackout Rule (TAC Nos. 68525 and 68526)
(b) letter from Mr. D. G. Mcdonald, Jr. (NRC) to Mr. G. C. Creel (BG&E), dated February 12, 1991, Response to Station Blackout Rule (TAC Nos.68525 and 68526)
Gentlemen:
In response to the requirements of 10 CFR 50.63, Baltimore Gas and Electric Company is adding two safety-related diesel generators at our two-unit Calvert Cliffs Nuclear Power Plant. These diesel generators will not only enhance our ability to meet station blackout requirements, but they will also provide spare capacity for future plant modifications. After the installation of the new diesel generators is complete, we will have one diesel generator dedicated to each of the four engineered safety features busses, with the fifth diesel generator used to mitigate station blackout conditions and as a standby for any of the four dedicated diesel generators. The NRC has reviewed and approved the basic concept of our station blackout response capability as both an alternate AC and AC independent site (References a and b). This approval was contingent upon our submittal to the NRC of design information concerning: the new diesJ generator installation, the change in our on-site emergency electrical system and the alternate AC source. The attachment to this letter is one of the submittals requested.
In order to gain NRC approvi rd the modifications to our on-site emergency electrical system, we are preparing a series of desigi P. ports for NRC review. The<c design reports will cover appropriate aspects of the diesel generator design and qualification, and changes to our electrical system. The design reports have been broken down into several groups to aid in their review by the NRC. These groups are; Civil Engineering, SACM Diesel Getu rators, Mechanical Engineering, Instrumentation and Control and Electrical Engineering. In addition to the design reports, other correspondence will a n n, t c, 212280112 921218 0\\
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Document Control Desk December 18,1992
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be provided to describe any deviations, exceptions or exemptions to the codes and standards we are using to design the modifications. Information concerning the alternate AC source and a request for changes to the Technical Specifications will be supplied in separate submittals.
The Civil Engineering Design Report is attached. His report presents the siting and structural design information for the Diesel Generator Buildings; Information concerning the meteorological-and geological conditions for the-Diesel Generator Building site is also included. The Diesel Generator Buildings will be Category 1, reinforced concrete structures, designed to withstand design basis load conditions. The structures are designed to protect the new diesel generators and their support systems from floods, carthquakes, missile hazards, wind and tornado effects. The Diesel Generator Building design and analyses are described in the report.
It should be noted that this is Revision 0 of the Civil Engineering Report. While the majority of the building design and analysis is complete, some of the information was not available at the time this-report was produced. An area of particular interest is the structural response to a seismic' event.
With the exception of calculating the scismic displacements, the scismic analysis for the buildings has been completed. Scismic loads for the structural analysis have been determined. When the scismic displacements have been finalized, the figures showing the response will be forwarded in a future revision to the Civil Engineering report. Responses to questions or concerns arising from the NRC review will also be included in future report revisions.
We request this report be reviev ed and approved by April 15,1993. Currently, excavation activitics are underway at the Diesel Generator Building site. ne pouring of concrete for the basemat is scheduled to begin April 23,1993. Construction should proceed rapidly after that, with the pouring of the first floor begmning July 16,1993; The building is scheduled to be completed in June 1994.
The approvai date was requested to ensure that issues which could affect construction of the building could be resolved before significant construction had taken place.
Should you have any further questions regarding this matter, we will be pleased to discuss them with you.
-.Vc truly yours, RED / PSF / psf /dtm Attachment cc:
D. A. Brune, Esquire -
J. E. Silberg, Esquire R. A. Capra, NRC
. D. G. Mcdonald, Jr., NRC.
T. T. Martin, NRC P. R. Wilson, NRC R. I. McLean, DNR J. H. Walter, PSC.
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