ML19330C353

Forwards Data Re Environ Radiation Dispersion,Per M Wohl Telcon Request

ML19330C353
Person / Time
Site:	05000124
Issue date:	08/01/1980
From:	Curtner A VIRGINIA POLYTECHNIC INSTITUTE & STATE UNIV., BLACKSB
To:	Joshua Wilson Office of Nuclear Reactor Regulation
Shared Package
ML19330C354	List: ML19330C353
References
NUDOCS 8008080277
Download: ML19330C353 (2)

Text

..

COLLEGE OF ENGINEERING r ~

VIRGINIA POLYTECHNIC INSTITUTE AND STATE UNIVERSITY

'Bladsburg, l'irginia 24061

. Necura Acmanov AM AMM LABORATORY August 1, 1980 Mr. J. Uilson U.S. Nuclear Regulatory Commission -

Standardization and Special Projects Branch '

Division of Licensing Washington D.C. 20555

Dear Sir:

, 3 The following data is enclosed in response to a request by Mr.

Millard Wohl via telephone conversation.

-5 Maximum calculated Argon-41 release rate is 5.5 x 10 C1/sec.

Volumetric flow rate measured in the stack is 2117 ft / min; conversion to al/sec:

0 (2117 ft / min) (2.83 x 10 ml/ft3) (1 min /60 see) =

0 9.99 x 10 ml/sec Calculation of maximum concentration leaving the stock and entering the booster-fan.

-11 5.5 x 10 -5

-5 5.5 x 10 Ci/sec = 5.5 x 10 C1/ml or pCi/ml 5

9.99 x 10 d/see Booster Fan Dilution Factor The volumetric flow rate of the booster fan is 12,700 ft / 3min.

The booster fan provides the following dilution:

-5 -6 (5.5 x 10 Ci/ml) /2117 ft3 / min \ = 9.17 x 10 C1/ml 3

(12,700 ft / min Maximum vearly release allowed assuming 4 x 10' uCi/ml released continuously to an unrestricted area:

e 5

(4 x 10' pC1/ml) (9.99 x 10 ml/sec) (3.15 x 107sec/ year) = 1.26 C1/yr h070 THIS DOCUMENT CONTAINS .5 POOR QUAUTY PAGES ef

//

scesoso  : 2.77- P

r R

.page 2 Ur. J. 'v:11 son Calculation of environmental dispersion factor: ,-

The current Technical Specifications allow ug to exhaust up to 315 Ci/yr not to exceed a release rate of 1 x 10 Ci/sec. (note also the enclosed safety evaluation done by the' Commission)

Therefore we assume a dispersion factor of:

1.26 C1/yr ~

= 4 x 10 315 C1/yr Calculation of maximum concentration released to an unrestricted area considering the environmental dispersion factor:

-6 ~ -8 (9.17 x 10 pCi/ml) (4 x 10 ) = 3.67 x 10 Ci/m1 This assumes we operate the reactor 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> a day, 365 days a year.

Our actual operating schedule is 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> a day, 5 days a week maximum.

Therefore averaging this concentration over the year yields: (10CFR 20.106 (a)) :

-8

.(3.67 x 10 uci/ml) /2086 hr./yrI= 8.74 x 10 ~9 pCi/mi

, 8760 hr./yr) -"

Sincerely yours,

{$f& (- iS .g t Alan P. Curtner Reactor Supervisor APC/fbl

Enclosure:

Safety Evaluation by the Division of Reactor Licensing occ : Dr. T. F. Parkinson, Director NRL Dr. A. K. Furr, Deputy. Director NRL Mr. R. D. Mogle, Radiation Safety Officer Dr. R. H. Miller, Chairman, Reactor Safety Committee 1

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