ML19329D784

Forwards Request for Addl Info Re Hurricane Protection Per Review of Matl Shubmitted by Util,Noaa & Cerc.Also Forwards Hydrologic Engineering Summary & Evaluation of Hurricane Verification Studies & Design Basis Hurricane

ML19329D784
Person / Time
Site:	Crystal River
Issue date:	10/12/1973
From:	Schwencer A US ATOMIC ENERGY COMMISSION (AEC)
To:	Rodgers J FLORIDA POWER CORP.
Shared Package
ML19329D785	List: ML19329D784 ML19329D787 ML19329D792
References
NUDOCS 8003170729
Download: ML19329D784 (4)

Text

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ATTN Mr. J. T. Emdgers

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, (PMR) for' Cry'stel River Meilear "- -- '-- Plant,. Wielt -3,~ us find tihek'N?I,fM'

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• g en hurriemme posin based seen' review of the nati&ial supplietjbFQ' rierida Power coeperation, the u. s. Army Ceestal Engineering Besserek ~

Centse (CERC),'and Natiemel Oceanic and Atmospheric Administraties Y \\ Mi-(NOAA), and a detailed N7 ' t review and smalyses by both the staff M

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'egeipment required'for eede shutdeus of the plant be designed,te,utshot[med*f 7 '

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this letter of your confirmation of the schedule or the date you will be able to meet. If you cannot meet our specified date or if your reply is not fully responsive to our request, it is highly likely that the overall sehedule for completing the licensing review for the project will have to be eatended. Since reassiganent of the staff's efforts will require completion of the new assignment prior te, returning to this project, the entent of the essension will meet likely )e greater than the delay in g j.;

your resposas.1 Please oesteet us if yegspve any questions regarding tg g,.;

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1 REGULATORY POSITIONS CRYSTAL RIVER NUCLEAR STATION DOCKET NO. 50-302 It is our position that the hurricane design basis water level for your plant should be elevation 33.4 feet above mean low water (MLW). This position is based upon a detailed comparison of the ability of your consultant's (Dames and Moore) model and, the U. S. Army Coastal Engineering Research Center's (CERC) model to reproduce historical hurricane surges and hypothetical storm

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surges for which analytical solutions are available. The numerical procedures of both models were verified by comparing results to the analytical solutions.

Verification of historical hurricane surges by either model was highly dependent upon the proper selection of values for the wind stress model calibration 2

coefficient. The comparison indicates the.use of either model is generally accep able for probable maximum hurricane (PMH) surge estimates; however, the selection of specific calibration coefficients (wind stress, bottom friction, and initial rise)<

derived from limited verification studies does not support your design basis surge level with any higher degree of confidence than coefficients derived from similar studies with the CERC model.

Therefore, there is no assurance that your estimate is conservative and it is our position that the PMH estimate determined from the CERC model should be used as the hurricane design basis water level.

ENCLOSURE 1

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Th'e design bases for protection you have proposed in section.9.3.2 of enclosure 2 (the Gilbert Asso'ciates, Inc. Report No. 1807) to you r le t ter o f July 13, 1973, 1

are adequate for a flood level of 33.4 ft. KLW, with one exception.

The exception is the concrete barrier wall'atound the west and north sides of the turbine

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room wall.

If there is any safety-related equipment necessary to-maintain shutdown during a PMH situation that can be adversely effected through the turbine building, then it is our position that protection of that facility is required for wat,er, wind, pressure,

'and missile effects.

Based on the foregoing, provide 8

suwmary of yuur intended hurricane design bases, and a

if prot'ection of the turbine building is required for maintenance of shutdown, provide your analyses of the water, wind, pressure, and missile. effects on that facility.

If.no safety-related equipment is required to achieve and maintain shutdown that can be affected through the turbine building, then your proposed turbine building protection is not required.

1Barriers and water-tight doors on the south and vest sides of safety-related structures to elevation 127, and to elevation 124 on the east side.

Emergency action to fill the neutralizer tank, condensate storage tank, and fire water storage tanks before high water.

The above elevations are to be raised to 129, 2See position 2 of Regulatory Guide 1.59.

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