ML20244C728
Text
,
W" f...
W i
Comments on i
NIACARA MOHAWK PONER COMPANY _t. f, D
j 4
Preliminary Hazards Summary Report - Nine }filip.yy
- h Point Nuclear Station, Vol. I&II dated April 1964
- ,qfy g
L"..
- s. g.)
- ).l.(-)[
.g v m' U
p.g 1
Prepared by y4 u
n cs 5
2*.
' Environmental Meteorological Research Projyt /
os
.w.;
pffice of Meteorological Research U. S. Weather Bureau May 20, 1964 q
.]
- F
~These comments are exclusively directed toward the meteorological aspects of th
- [
J. [
report.
h The meteorological analyses are very comprehensive. ' They are based on, _ or re Thus these ' analyses _are enced to,- a' year.of excellent measurements at the site.
subject to much less uncertainty than estimates based on average diffusion param 1
eters. The dilution estimates presented should provide reasonably accurate
{
- (!
engineering estimates and will be easy to extend with the additional meteor cal data being collected.
N Ye agree that. the lake shore installation will result in def T
l and with data from Monroe, Michigan indicates similar cyclic phenomena at all regimes.
The inversion frequency measured at Oswego 1,s
,y b
three ' lake-side installations.
The wind direction' persistence data supported by analyses 2 of radiosonde data.
of Table A-6 and the estimates of sector variability on page A-17, Vol. II are I
- [1 well; supported.by an analysis 3 of five years of wind data in the general area.
1 There are, however,. two meteorological patterns which are not treated which 1
probably deserve consideration to determine if they are germana and to assess Li E
their relative importance. These are:
- 1. The dilution of an effluent plume which travels almost entirely over water prior to reaching a potential receptor d,uring periods when ilas lake water 4
9 h Such a condition would occur with effluent plumes in is _ colder than the air.
j Sectors A, B, C and a portion of D (i.e., with winds from about 560 clockwise h
i For '
through about'2550)..Tnis situation should be primarily during t,s spr ng.
J jf, all of Sector A and a portion of Sector B the overwater travel is long in excessThe stab of 40 miles, but in. Sectors C and D this can be much less.nce o l'
.ilution.
1
)l
- 2. The fumigation dilution situation created by the penetration of cooler, '
The heating from the land can penetrate g
stable air from the lake over warmed land.
.2891, j-L
.l l.
i f
890-4200387 890413 cPDR DIA um nmv.n _. n a mm t p
J 2
I to a plume aloft and bring it to the surface in relatively high concentrations.
l Calculations of surface concentra-
)
This phenomenon has becq reported by Hewson.10 kilometers during a Class IV d wind direction standard deviation (10 from Table A-3) yields dilution factors near tions at (This results j
3 y 10 5 or soccwhat higher than the ground icvel inversion case edly greater lateral spreading which would occur in the mixed layer below the These values are probably of short dyration but are
" inversion plume" aloft.)
sufficiently high that determination of the height of the mixed, layer versus distance from the lake together with the azimuthal frequency o# this o i
i seems desirabic.
is sufficient to reach the plume aloft and mix it downwards but not sufficient to (The observational program at Point Douglas 2
penetrate the total inversion layer.
(op. cit) should provide useful input to this analysis.)
,8-I ddition to the preceeding items which may require study, we note the following:
In
(
The dilution parameters Section 2.24 (pages A-5 and A-6) and Table A-3.
Since, if we 1.
wit.in each of the four classes are based on the data in Table A-3.
interpret the footnote correctly, only 15 standard deviations were actually com-Nor does this puted, the number of samples in each class is certainly not large are mean values or perhaps conservative values more toward the extremes of the Since there exists a good (though not perfect) relationship between wind direction range (5, 6)eand standard deviations, a much larger sample of data is sample.
Additional statistics of this type would available from existing wind charts.
support the analysis.
In connectior, with the analysis of long term concentrations (Section 3.41-3.46 page A-10 to A-17) we agree with the approach and concur that the use of,a-2.
- However, j
uni-directional wind for very long periods is entirely unrealistic.
since the seven sectors are of unequal angular width, the data are not strictly.
I comparable if a particular sector includes wind directions with significantly different occurrence frequencies. This appears to be the case of the 900 Sector D (Table A-6 and Figures A-5 and wh4.ch includes winds from USW, U, UhV and NW.
It appears that there is an abrupt drop in frequency of A-14.6 are germane.)
The inclusion of occurrence in direction between about Ucst and West-Northwest.
these lower frequency sectors could tend to mask a higher cumulative exposure in Since the community of Pulaski lies in this area, and since a more narrow sectcr.
the effluent traverse could be largely overwater, it may be advisable to reanalyze j
segments particularly for 'the spring and early summer months 0
Sector D into 22-1/2 Such when a " fumigation" condition could bring an inversion plume to the ground.
an analysis might suggest some modification of Section 3.452 (page A-16) and Table _
~
A-12.
i Comparison of calculated dilution values for selected cases, by a different 3.
ec hnique, gave very similar values.
summary, we belicyc the meteorological :.nalysis is exceptionally useful and Ir We have noted special er ompasses a wide variety of realistic dilution regimes.
(
l
)
4 f,
i l '.'
3 We believe that meteorological problems which were not covered in tha analysis.
additional data can be derived from existing wind records to provide more com-j prehensive statistics on the dilution coefficients of the four dilution regimes It is possible that reanalysis of Sector D in smaller (22-1/2 ) ' segments coul 0
it) crease the exposure vc. lues above -those shown in Tables A-10.k j
t 1
[
1
~
REFERENCES "The Micrometeorology of Douglas loint, Ont,", Canadian
- 1. Munn, R. L, 19 63 :
Met, Mem., No..12.
a f
" Low Level Inversion Frequency in the Contiguous United '
a l
2 Hosler, C.
R., 1961:
j States", Monthly Weather Review, No. 89, pp 319-339.
J
- 3. V. B. Research Study - in progress.
" Atmospheric Pollution", Compendium of Meteorology,
?.
- 4. Hewson, E. W., 1951:
1145-1146.
American Meteorological Society, pp
" Diffusion Climatology of the
- 5. DeMarrais, C. A. and Islitzer, N. F.,1960: National Reactor Testin
'I Falls, Idaho, pp 106-118.
"On the Relationship of Range to Standard Deviation of i 3
- 6. Markee, E. H., 1963:
^
Wind Fluctuations," Monthly Weather Review, No, 91, pp 83.
f-i e
A'T 3
l t
k 1
a I
l t
" - - - - - - - _ - - _. - _ _ _ _ _ _ _ _ _ _ _ _ _ _ ___