ML19312C598

Comments on Oconee Units 1 & 2 Psar,Amend 2,dtd 670418. Prepared by Environ Meteorology Branch of Institute for Atmospheric Sciences

ML19312C598
Person / Time
Site:	Oconee
Issue date:	05/03/1967
From:	COMMERCE, DEPT. OF
To:
Shared Package
ML19312C593	List: ML19312C598
References
NUDOCS 7912180917
Download: ML19312C598 (2)

Text

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14 g Comments on Oconee Nuclear Station Units 1 and 2 Duke Power Company Preliminary Safety Analysis Report Amendment #2 dated April 18, 1967

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Prepared by p p 7t Environmental Meteorology Branch Institute for Atmospheric Sciences

-May 3, 1967 The critical off-site location with regard to high concentrations would appear to be the Keowee River valley to the east and southeast of the site. As indicated by a statement in the applicant's revision, the terrain in this direction will modify the drainage flow direction to that following the Keowee River. At the 1 mile site boundary the valley is confined by two hills at a height of 778 and 773 f t Mean Sea Level and separated by a horizontal distance of about 2000 feet. Thus, with the valley floor at 660 ft MSL the cross-sectional area at the height of these hills is about 1 x 10 square feet. The valley remains restricted in a similar fashion farther downstream.

Depending upon the assumptions used, the following concentrations could be attained at the site boundary of 1600 meters:

Assumption y/Q (see m )

Type F, 1 m/sec, no bldg. effect 3.4 x 10 Type F, 1 m/sec, b1dg. effect C = .5, A = 5180 m# 1.6 x 10 Type F,1 m/sec, bldg. ef fect C = 1.0, A = 5180 m' 1.1 x 10 5 2 Valley Confinement, u = 1 m/sec, Area = 10 g 1.0 x 10

-5 Type F, u = 1.9 m/sec, b1dg. ef fect C = 1.0, A = 5180 m' 6.0 x 10 Since very little site meteorological data are available, it remains to be seen whether a wind speed of- L.9 as opposed to 1.0 m/sec is more appropriately conservative. The applicant has chosen to use the least conservative assumption listed above, resulting in a concentration a f actor of 5 lower than T.I.D.14844 meteorology, which does not give

> credit for building turbulence effects.

In addition to the meteorological measurements planned for the microwave tower on a hill to the west of the reactor building complex, it is also necessary to measure air flow in the valley to the east if information on l /9'~77 A l N912180 9/7

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.o 7 'I the drainage flow is to be obtained. Ilowever, any measurement progran started now will not truly reficct the conditions which will exist when Keowee Dam is completed and Lake Keowee to the west and north of the site has above reached plant grade. its full pond elevation of 800 feet MSL, which is 4 feet In summary, atmospheric diffusion rates in the general area of the site are expected to be somewhat lower on the average when compared to other locations in the United States. With the construction of Keowee Dam and its resevoir, the primary nighttime, inversion transport is expected to be down the Keowee River valley. Assuming an effluent will be confined to the val'ey to a height of about 100 feet at the site boundary, a concentration of 1 x 10-4 sec m-3 would result with a wind speed of 1 m/see and uniform mixing within the valley. This would be our best, estimate at the moment, of a controlling concentration.

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