ML19317E812

Comments on Oconee Units 1,2 & 3 Fsar,Amend 15 Dtd 700709 & Amend 16 Dtd 700723. Prepared by Air Resources Environ Lab of Environ Science Svcs Administration

ML19317E812
Person / Time
Site:	Oconee
Issue date:	07/29/1970
From:	COMMERCE, DEPT. OF
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ML19317E811	List: ML19317E812
References
NUDOCS 7912181004
Download: ML19317E812 (2)

Text

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Commenta on Oconee Nuclear Station Unita 1, 2, and 3 Duke Power Company Final Safety Analysis Report Amendment No. 15 dated July 9, 1970 and Amendment No. 16 Dated July 23, 1970 Prepared by Air Resources Environmental Laboratory EnvironmentalJuly Science 29,1970Services Administration The fifteen gas tracer experiments conducted rn theunder site poor (inversion)conditionsshowthatinallcasesthecenterline the use of the equivalent Pasquill Type s.

diffusion e y rate; Table 2A-2 The closest agreement of 4 x 10-equivalent estim for a stability category of seeType F wa seem->wasmeasuredatawindspeedof5.4m/sec 2.4 x 104 see maged concentration for Pasquill Type F wouldThe be It zmnt, however, be assumed that a building wake effec the cause for this difference.

the measured value.this effect brings the estimated .

for value to a igher than An ernmination of the joint frequency tabulation n at of wi d the 150-ft tower under slightly stable and moderately the topt of o strongly stable rate equal to or worse than Pasquill the data to the 5 percent level of prob .

Type F and usion Extrapolating rate equivalent to Type F and 1 m/sec. ability results in a diffusion Although a wind speed calibration check made in Octobe the speed to be reading low by a factor of 1.4 r 1969 indicated way to determine how long this situation has pe,rsisted o what and tthere is no extent lapse the rate data were in the affected. joidt frequency tables of speed and tem perature

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It was obvious from a site visit by AEC and ESSA personnel i 1970 that the terrain within the site boundary isnvery February ae and complic t d that it is difficult to make near-surface measurements represent,ative of the general flow of air in the areac of would the bereact whi i or E514 7 912180 /OCf

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co= plex. Because of the wooded nature of the terrain it was felt that the measurement above tree-top level at the top of the 150-ft micro-wave tower would most nearly represent the ambient flow from the reactor complex, although speeds would be somewhat over--

estimated with regard to near-surface conditions. However, it could well be that this overestimation is compensated for by the under-estimation due to calibration errors.

In summnry, for the short-term release (0-2 hours) it appears from the data presented that at the site boundary of 1.6 km, assuming an effective ground release, the use of Fasquill F diffusion, a 1m/seewindspeed,afactorof2.2betterdiffusionbecauseof site characteristics quantitatively sh by onsite diffusion experiments, and a AA factor of 1270 m because of building wake effect is apprap-iately conseryative. The resulting concentration would be approximately 1 x 10% see m-3 I

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