ML20137K525

Forwards Results of Requested Model 1,Reg Guide 1.95 Dispersion Model Run Using Class Stability of F W/Wind Velocity of 0.7 M/Sec. Chlorine Concentration at Control Bldg Air Intakes Graph Encl

ML20137K525
Person / Time
Site:	Vogtle
Issue date:	01/17/1986
From:	Bailey J GEORGIA POWER CO.
To:	Denton, Harold Denton, Youngblood B Office of Nuclear Reactor Regulation
References
RTR-REGGD-01.095, RTR-REGGD-1.095 0053V, 53V, GN-782, NUDOCS 8601240121
Download: ML20137K525 (3)

Text

.-

Georgia Power Company Project Management Route 2. Box 299A Waynesboro, Georgia 30830

,-' Telephone 404 724-8114 f 404 554-9961 Southern Company Services, Inc.

Post Office Box 2625 '

B,,m.non.m.u.e.m.35202 Telephone 205 870-6011 Vogtle Project s

January 17, 1986 Director of Nuclear Reactor Regulation File: X7BC35 Attention: Mr. B. J. Youngblood Log: GN-782 PWR Project Directorate #4 Division of PWR Licensing A U. S. Nuclear Regulatory Commission Washington, D.C. 20555 REF: Letter from Bailey to Denton, GN-750 Dated 11/26/85 NRC DOCKEI NUMBERS 50-424 AND 50-425 CONSTRUCTION PERMIT NUMBERS CPPR-108 AND CPPR-109 V0GTLE ELECTRIC GENERATING PLANT - UNITS 1 AND 2 SER OPEN ITEM 4: T0XIC GAS EVALUATION

Dear Mr. Denton:

On December 30, 1985 your staff made a verbal request for supplemental information resulting from their review of the referenced letter.

Specifically it was requested that the Model 1, Regulatory Guide 1.95 dispersion model, be run using a class stability of F with a wind velocity of

.7 m/sec. Attached is the result of this requested model run.

As noted in the referenced letter, the .9 m/sec represents the worst fif th percentile conditions as called for in Regulatory Guide 1.95. The attached supplemental information provides your staff a comparison with the referenced submittal to this requested lower windspeed concentration curve. We have reviewed our earlier calculations used to determine the worst fif th percentile X/Q for the VEGP site using the joint frequency distribution of windspeed and atmospheric stability presented in Table 2.3.2-15 of the FSAR. Our review confirms that the VEGP site Regulatory Guide 1.95 dispersion model worst fifth percentile dispersion conditions are characterized by a Pasquill F stability and .9 m/see windspeed. As such, we feel that any additional analysis performed to determine the control room clorine concentration should use a wind velocity of .9 m/sec.

If you have any questions, please contact me.

Sincerely, J. A. Bailey gd{

Project Licensing Manager , g JAB /sm 9601240121 860117 Attachment PDR ADOCK 05000424 PDR E

xc: List attached.

l Y.' * '

• ~

Director of Nuclear Reactor Regulation File: ~X7BC35 January 15, 1986 Log: GN-782 h Page 2

s. 5 t

xc: R. E. Conway G. Bockhold, Jr.

R. A. Thomas T. Johnson J. E. Joiner, Esquire D. C. Teper B. W. Churchill, Esquire L. Fowler M. A. Miller W. C. Ramsey B. Jones Vogtle Project File L. T. Cucwa 0053V <

a I

4 I

j

+t

% O

Attachment 1

. 300.000 LEGEND 2M.M Oamma REG. GUIDE 1.95 MODFL 1 F STABILITY,0.9 M/SEC O-ELEVATED INTAKE MODEL 2.8 STABILITY,2.5 M/SEC Q- == BUILDING WAKE MODEL 3, F STABILITY, 0.S M/SEC A..... REG Gul0E 1.95 MODEL 1. F STABILITY,0.7 M/SEC 100.000

~

80,000 60.000 11 40,000 ,!\

I I

20.000 o g

iI A

E 'O C" 6

3.000 y fi g 6 a,

= 6.000 N  !

.c ,- .

E -

I \

4.000 4

~

l n y i \

E 2.000 i  %

E I i

=

• A l l E i i i

• A a .....

g 1.000 g ,

y .

o 800 g y 7 ~ , -

w....,,,*"- R EG. G U ID E 1.9 5

}

i e

]  %' EG. GUIDE 1.95

= "0 3

's

() , i  ! I *D= %

l

• j ' *"" % % BUILDING WAKE NO , a  % MODEL y  ;

I I I i iOO _ o l

< .  ?.

\ '  !

40

( ,

?

i, 7

j f) .

ELEVATEDINTAKE 20 l i I  ;

10 y  ?!'* -

100 200 300 400 500 600 M TIME AFTER RELEASE,SEC CHLORINE CONCENTRATION AT CONTROL BUILDING AIR INTAKES l

l. _ _.. .-. _

. _ _ _ _ _ _ _ _ _ _ _ _ _ . _ _ , . - - _ . _ . _ __