ML19317E812
| ML19317E812 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 07/29/1970 |
| From: | COMMERCE, DEPT. OF |
| To: | |
| Shared Package | |
| ML19317E811 | List: |
| 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 Environmental Science Services Administration July 29,1970 The fifteen gas tracer experiments conducted rn the site (inversion)conditionsshowthatinallcasesthecenterline under poor the use of the equivalent Pasquill Type diffusion rate e
y agreement for a stability category of Type F wa s.
The closest Table 2A-2 see of 4 x 10-seem->wasmeasuredatawindspeedof5.4m/sec equivalent estim 2.4 x 104 see maged concentration for Pasquill Type F would be The It zmnt, however, be assumed that a building wake effec the cause for this difference.
the measured value.this effect brings the estimated value to a for igher than An ernmination of the joint frequency tabulation of wi d the 150-ft tower under slightly stable and moderately t at the top of n
rate equal to or worse than Pasquill Type F and o strongly stable usion the data to the 5 percent level of prob 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 and tthere is no extent the data in the joidt frequency tables of speed and tem o what lapse rate were affected.
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 is very complic t d n February that it is difficult to make near-surface measurements whi ae and represent,ative of the general flow of air in the area of the react c would be 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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