ML20046C045
| ML20046C045 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 07/30/1993 |
| From: | Denton R BALTIMORE GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| TAC-M85222, TAC-M85223, NUDOCS 9308090150 | |
| Download: ML20046C045 (3) | |
Text
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-t BALTIMORE GAS AND ELECTRIC 1650 CALVERT CLIFFS PARKWAY. LUSBY, MARYLAND 20657-4702 ROBERT E DENTON vier parsic, cut July 30,1993 NUCLcAR DeERGY (460,460 4455 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 Request for Additional Information - Civil Engineering Design Report (TAC Nos. M85222 and MR5223)
At a meeting between BG&E and NRC Staff members on July 22, 1993, several issues were identified which required some clarification. Those issues and our responses are provided in l
Attachment (1).
Should you have any further questions regarding this matter, we will be pleased to discuss them with you.
Very truly yours, n
WW~
1 RED / PSF / psf / dim /bjd Attachment i
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 4
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A'ITACIIMENT 0)
RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION CIVIL ENGINEERING DESIGN REPORT DIESEL GENERATOR PROJECT During the July 22,1993 meeting with the NRC Civil Engineering and Geosciences Branch Staff, four items were identified which required formal resolution. These items and the responses are provided below.
1.
Section 3.5.2 of the Civil Engineering Design Report references three methods for tomado missile analysis. Identify the method usedfor the Diesel Generator Building araf provide the assumptions used when the method was applied.
IIG&E Resmmse The response chart solution method was used to design the Diesel Generator Building to withstand tornado missile impact. The following five assumptions were applied during the analysis:
The structural response for missile impact was calculated using the response chart solutions.
The walls are supported at the slab levels. To account for the actual boundary condition, both simply supported and fixed conditions were considered.
The walls are supported at the sidea by the building side walls.
The design reinforcement is the sum of the reinforcement required for pressure, wind and missile loads.
The design was performed for the governing case. The remaining walls will receive the same reinforcement as the governing case.
2.
The Diesel Generator Building was designedfor snow loading. State whether the building design considered the snow load as a dead load or a live load.
IlG&E Resmmse t
Snow loads were considered as live loads in the Diesel Generator Buiiding design.
Section 3.8.1 of the Civil Engineering Design Report provides a description of live loads.
This description will be revised in Revision 1 of the Civil Engineering Design Report to include snow loads.
3.
Section 2.3.2 of the Civil Engineering Design Report states that apprarimately two. thirds of the i
building's settlement will occur during constmction. Provide the reference used to make this conclusion.
IIG&E Response Schmertmann, J.H., " Static Cone to Compute Static Settlement Over Sand," Journal of Soil Mechanics and Foundations Division, ASCE, Volume 96, May 1970 t
l 1
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i ATTACilMENT 0)
RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION l
CIVIL ENGINEERING DESIGN REPORT DIESEL GENERATOR PROJECT l
4.
Figure 2-37 of the Civil Engineering Design Repon shows three buildings wi.'ich would house safety-related dieselgenerators. Following submittal of the repon to the NRC, theproject scope was changed to building only one safety related diesel generator and one non-safety-related diesel generator. Describe the location of the Category I and non-Category I buildings with respect to the non-Category I crib wall IIG&E Hesponse 1
Figure 2-37 of the Civil Engineering Design Report shows the foundation footprint for three buildings, with the southernmost building being the closest to the non-safety-related crib wall.
The Diesel Generator Project's scope has been revised since the submittal of the Cisil Engineering Design Report.
Currently, the Diesel Generator Project's scope includes the construction of one Category I and one Category II building. The Category II building will house a non-safety related station blackout diesel generator.
The third building, identified as Building No. 3 (northernmost) on Figure 2-37, has been deleted from the project scope.
The Category I building is being constructed at the Building No. 2 (middle building) location j
on Figure 2-37. The Category II building will be constructed to the south of the Category I i
building (the approximate location of Building No. I). Section 2.3.3 of the Civil Engineering
)
Design Report describes the stability of the slope behind the non-safety related crib wall.
j nis section also discusses the effect of the failure of the non-safety related crib wall on the safety related building. The report assumed that Building No. I (southernmost) was the building affected by the crib wall failure. Now that the safety related building is located at the Building No. 2 position (middle building), the effect of the crib wall failure will not be any greater than that assumed in the evaluation.
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