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Peter A. 'Norris, D1' rector DivisionofReactr-(Licensing SAFETY ANALYSIS REPORT Y
Reference is made to the letters of October 16 and October D
from Roger S. boyd, Assistant Director for Reactor Projects, DRL, 17, 1966,
r to the Environmental Science Services Administration requesting
.commento on the following safety analysis reports, i
I respectively:
K Donald C. Cook huclear Plant s
Indiana and Michigan Electric Company l
1 Preliminary Safety. Analysis Report Amendment Letter dated' September 30, 1966 i
Quad-Cities Station, Units 1 and 2 i
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Commonwealth Edison Company and lowa-Illinois Gas and Electric Company Safety Analysis Report
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t Volumes I, II and III dated August 30, 1968 Review by the Air Rdsources Environmental Laboratory, ESSA, j
x now been completed and their comments are enclosed.
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a Milton Shaw, Director RDT:NS:S540 Division of Reactor Development and Technology j
Enclosu re :
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Comments (Orig and 1 cy.)
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R. S. Boyd, Assistant Dir. for Re.ictor Projects, DRL cc:
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Co;.ments, on Quad-Cities Station, Units 1 and 2-Corm:1onwealth Edison Company and Iowa-Illinois Gas and Elcetric Compary Safety Analysis Report Volumes I, II and III dated August 33, 1963 Prepared by Air Resources Environmental Laboratory Environmental Science Services Administration October 21, 1968 Since no new meteorological information is presented other than that in the original Plant Design Analysis Report, our comments of June 29, 1966, are still valid. The conclusion at that time was that for the accidental elevated release, the most critical atmospheric condition was one which would tend to bring the elevated plume rapidly to the surface. This could occur under very unstable or under fumigation conditions. Thus, at the site boundary of 400 m an average 2-hour relative concentration of 2 x 10-5 see m-3 could result assuming a 100 m effective stack heli;ht, Pasquill Type A diffusion and a 1 m/sec wind speed. A somewhat more conservative estimate would be to assume inversion fumigation conditions to exist for the first 33 minutes of the accident followed by very unstable conditions, for the resultingconcentrationwouldbeabout6x10-5seemfsec.
remainder of the 2 hrurs, all with a vind speed of 1 m The s.
This compares with a value of 1 x 10-5 see m-3 at 400 m as listed under cate ory U-l in Table XIV-4-4 of the applicant's initial report.
o On an annual basis, the long term climatic record from Moline, which j
is the closest availabic to the site, shows a maximum frequency of 0 sector from the south. This i
vind direction of 7 7% in the 221/2 does not include " calm" conditions which totaled 10.2 percent over
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all directions. The recent Dresden data for the 15-ft level shows c maximum frequency of 9 9% in the 221/2 sector from the south, 0
including calms. Thus, a reasonable maximum annual vind frequency in a 22 1/20 sector would be about 10 percent. Assumin; that durina; the year the diffusion conditions would be equally divided among Pasquill Types B, D and F vith a 5 m/sec wind and a subsequent effective stack heicht of 138 m for Unit 1 alone, the average annual relative Ground concentgationvouldreachamaximumat1000mtothenorthof S x 10-see m-3 Based on a continuous I-131 stack release rate of l
1 x 10-6 C1/sec, the maximum ground concentration would be l
5 x 10-lbjGi/cc. 'Ihis is 36 percent of the adjusted Maximum Permissable j
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2 Appendix A of the Safety Analysis Reconcentratio
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a s compared to -Figure 16 of to our use of a surface reflection fa tof 15 perce rcent) is at,ributed c or of 2.
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