ML19326C915
| ML19326C915 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear, Cook, Rancho Seco |
| Issue date: | 01/22/1968 |
| From: | Shaw M COMMERCE, DEPT. OF |
| To: | Morris P US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 8004290547 | |
| Download: ML19326C915 (2) | |
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7 Comments on Russellville Nuclear Unit Arkansas Power and Light Prr.liminary Safety Analysis Report Voluaes I and II dated November 29, 1967 Prepared by Air Resources Environmental Laboratory Environmental Science Services Administration January 10, 1968 The analysis of the Fort Smith and Little Rock meteorological data indicates that a continental diffusion climate can be expected at the Russellville site. This means a ~ pronounced difference between daytime and nighttime atmospheric diffusion rates, with the lower wind speeds l
and slower diffusion occurring at night. The predominant daytime wind direction for the general area would be from the southwest as shown by the Little Rock wind rose. Nighttime wind directions wich inversion conditions will most likely be towards the Dardanelle Reservoir of the Arkansas River.
The analysis of the Little Rock hourly weather reports with regard to diffusion types shows an average frequency of about 35% for Pasquill F condition during the four months considered ( see Table 2A.15). Tne annual nighttime wind speeds were less than 3 knots about 20% of the time at Little Rock (see Table 2A.6). On this basis, it would seem appropriately conservative to use inversion diffusion conditions (Type F} and a 1 m/see wind speed to compute the initial two-hour average concentration. This would result in a concentration of 6.4 x 10-4 see m-3 at the site boundary assuming a ground source with no credit 'for building-induced dilution. Taking credit for the building j'
effect as determined empirically in tests at the National Reacgor Testing Station would result in a concentration value of about 2 x 10
, which agrees with the applicant's value.
The analysis of the persistence of a diffusion condition in a unidirectional flow (Tables 2A.17 and ?.8) shows that no cases persisted l
longer than 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br />. Consequently, for the 24-hour average concentra' tion L
it would be conservative to assume inversion conditions, a 2 m/sec wind with concentrations averaged over a 22 1/2 degree arc.
At the site
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boundary this would result in amaverage concentration of 7 x 10-5 see m-3, which is. in reasonable agreement with the applicant's computation.
. In summary, a reasonable, conservative analysis has been made of the atm spheric diffusion conditions of the Russellville site which provides a sound basis for a preliminary safety evaluation of the proposed nuclear
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plant.
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