ML20135C948

Forwards Clarification of NRC Request for Meteorological Modeling in Event of Chlorine Release,Per 850822 & 29 Telcons Re SER Open Item 4, Toxic Gas Evaluation of Chemicals

ML20135C948
Person / Time
Site:	Vogtle
Issue date:	09/06/1985
From:	Adensam E Office of Nuclear Reactor Regulation
To:	Foster D GEORGIA POWER CO.
References
NUDOCS 8509130094
Download: ML20135C948 (3)

Text

"

September 6, 1985 Docket Nos: 50-424 _ DISTRIBUTION:-

and 50-425 Li. Docket. File _

NRC PDR Local PDR PRC System Mr. Donald O. Foster NSIC Vice President and General Manager LB #4 r/f Georgia Power Company MDuncan P.O. Box 299A, Route 2 MMiller Waynesboro, Georgia 30830 OELD, Attorney ACRS (16)

Dear Mr. Foster:

JPartlow BGrimes EJordan

Subject:

Clarification of Meterological Calculations Needed for Toxic Gas Evaluation of Chemicals (0 pen Item 4)

During telephone conference calls between the NRC and representatives of Georgia Power Company on August 22 and 29, 1985, it became apparent that your staff needed additional clarification to understand the NRC staff's requests for meteorological modeling in the event of a chlorine release. This infor-mation is related to SER Open Item 4, " Toxic gas evaluation of chemicals."

The enclosure contains a detailed discussion of the meteorological analyses to be submitted to the staff and should provide the needed clarification. If there any questions regarding this information, contact the Project Manager, Melanie Miller, at 301-492-4259.

Elinor G. Adensam, Chief licensing Branch No. 4 Division of licensing

Enclosure:

As stated cc: See next page

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Certiflod By

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Mr. Donald Foster Georgia Power Company Vogtle Electric Generating Plant cc:

Mr. L. T. Gucwa Resident Inspector  !

Chief Nuclear Engineer Nuclear Regulatory Commission  :

Georgia Power Company P. O. Box 572  :

P.O. Box 4545 Atlanta, Georgia 30302 Waynesboro, Georgia 30830 i

i Mr. Ruble A. Thomas Deppish Kirkland, III, Counsel {

Vice President - licensing Office of the Consumers' Utility  !

Yogtle Project Council l Georgia Power Company / Suite 225 '

Southern Company Services, Inc. 32 Peachtree Street, N.W.

P.O. Box 2625 Atlanta, Georgia 30303 -

Birmingham, Alabama 35202 James E. Joiner Mr. R. E. Conway Troutnen, Sanders, lockerman,  :

Senior Vice President - Nuclear & Ashmore  !

Power. Candler Building Georgia Power Company 127 Peachtree Street, N.E.

P.O. Box 4545 Atlanta, Georgia 30303  ;

Atlanta, Georgia 30302 j Douglas C. Teper -

Mr. J. A. Bailey Georgians Against Nuclear Energy I Project licensing Manager 1253 Lenox Circle Southern Company Services, Inc. Atlanta, Georgia 30306  :

P.O. Box 2625 Birmingham, Alabama 35202 laurie Fowler, Esq. ,

218 Flora Avenue, N.W.

Ernest l. Blake, Jr. Atlanta, Georgia 30307 Bruce W. Churchill, Esq. '

i Shaw, Pittman, Potts and Trowbridge i 1800 M Street, N.W.  ;

Washington, D. C. 20036 '

Tim Johnson Mr. G. Bockhold, Jr. Executive Director i Vogtle Plant Manager Educational Campaign for Georgia Power Company a Prosperous Georgia Route 2, Box 299-A 175 Trinity Avenue, S.W.

}

t Waynesboro, Georgia 30830 Atlanta, Georgia 30303 '

Regional Administrator, Region II  ;

U.S. Nuclear Regulatory Commission '

101 Marietta Street, N.W., Suite 2900 Atlanta, Georgia 30323 5

i

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1 ENCI.0SURE l

I Clarification of Meteorological Calculations for Chlorine Release at Vogtle The analysis of the potential consequences in the control room of the rupture of a one ton chlorine tank provided in your May 20, 1985, letter transmitting additional infonnation relative to the open item on the toxic gas evaluation of chemicals appears to be overly conservative. In order to scope the degree of conservatism of this analysis from a diffusion point of view, provide the free field analysis of the chlorine concentrations that would result at the-control room air intake as a result of the rupture of a one ton chlorine tank using the same release assumptions previously provided in your May 20 submittal but utilizing each of the three following diffusion techniques for the puff portion (25%) of the release:

1. Using 5% diffusion conditions with the Pasquill-Gifford parameters and the following equation:

N/Qg = [6.28 (Fxy + )H]-I where 5/Q

& g = =unit concentration XY standard deviationatofcloud center, the gas m' concentration in the horizontal alongwind and horizontal crosswind directions 7 assumed v meters H=

7;=infakeheight,Y)e,ters m initialstagrddeviationofthepuff, meters

=f Qv i (7.87'X g f where Qg = puff release quantity, grams Xg = the density of chlorine gas (3207gm/m3)

2. Using the most conservative stability condition (unstable conditions),

centerline, puff diffusion parameters (page 22 of NUREG-0570), ground release, the intake height and the equation (2.2-1) of NUREG-0570.

3. Using stable puff diffusion conditions (page 22 of NUREG-0570),

ground release, centerline, intake at the ground, building wake and the following equation:

[/Qg = [ 3.14 $Txy +

(#z + + CA]-I All terms except the following are defined above:

Q'z = standard deviation of the gas concentration in the vertical direction, meters C=1 A= Cross-sectionalareaofthgcontainmentbuildingabove the adjacent structurer, m