ML19330B401
| ML19330B401 | |
| Person / Time | |
|---|---|
| Site: | 07000025 |
| Issue date: | 06/18/1980 |
| From: | Rouse L NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| To: | Remley M EMVROCIA, ROCKWELL INTERNATIONAL CORP. |
| References | |
| REF-PROJ-M-3 NUDOCS 8007310542 | |
| Download: ML19330B401 (6) | |
Text
._
8 1980 Distribution: w/ encl.
Docket File Y
l l-Project File & PDRLPDR '/
l NMSS R/F FCAF R/F J bcc: DNPepper, SRL Docket tio. 70-25 LCRouse JJamison, BNWL Project M-3 NBurkhardt ECHatcon, BNWL JEAyer LSchwenditaan, BNWL INeseley JMishima, BNWL JShafer JCarson ti u Rockwell International j
Atomics International Division ATTM:
Dr. fl. E. Remley 3900 De Soto Avenue Canoga Park, r lifornia 91304 a
Gentlemen:
The purpose of this letter is to transmit for your information a revision to an increment of the analysis of the effects of na aral phenonena relative C
to your plutonium fabrication operations at Chatsworth, California. The subject increnent of analysis is the environmental character around your Chatsuorth, California plant. The revisions include significant changes 1
in demography and some minor changes in dispersion netcoroloay to our May 7,1980 subnittal to you.
Please substitute the attached five revised pages for the similarly numbered pages oreviously transmitted.
Any questions you may have on the enclosed revisions should be addressed to James E. Ayer of this Branch, who will direct resolution of connents.
t Sincerely, Leland C. Rouse, Chief Advanced Fuel and Spent Fuel Licensing Branch Division of Fuel Cycle and Material Safety
Enclosures:
Revised pages --
" Description of Site Environnent" Pages 2, 4, 6, a 7 THIS DOCUMENT CONTAINS 8 0 073106#/$2- ! {
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4 DESCRIPTION OF SITE ENVIRONMENT This description provides basic information concerning the physical, biological, and cultural environment of the Atomics International (AI) facilities near Santa Susana, California.
1.
SITE LOCATION The AI facility of interest is Building 055 at the Nuclear Development Field Laboratory (NDFL) in Ventura County, California located on Burro Flats at 34* 15' 15" N. latitude and 118* 42' 45" W. longitude.
Figure 1 shows the I
location of that facility relative to surrounding communities.
The NFDL facility is located in the Simi Hills of southeastern Ventura County, about 5 to 6 miles west of Canoga Park and about 29 miles northwest of downtown Los Angeles.
The site comprises about 290 acres of varying topography in a relatively isolated mountain setting.
The nearest communities are in the Simi Valley about 3 miles north of the site.
Immediately adjacent to the site is the Rocketdyne Santa Susana Field Test Laboratory -(SSFL).
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Figure 1.
Map of the Atomics International Facility and surroundings wi'hin a 5-mile radius.
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. Figure 2 provides an aerial view of the NFDL site, The valley in the left background is the Simi Valley, The area in the far right background is the western end of the San Fernando Valley, 2.
DEMOGRAPHY The 1980 pro.iected population distribution near the NFDL is shown in Table 1.
Approximately 110,000, persons are estimated to live within a 5-mile radius of the NFDL facility; the nearest resident lives ~.1.3 miles from the site, The population distribution centered on the NDFL, out to a radius of 50 miles of the AI facility is shown in-this Table; TABLE 1
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Al ROCKWELL POPULATION DISTRIBUTION WITHIN 50 MILES OF NFOL (1980 EST.)
D-1 1-2 2-3 34 4-5 5-10 10-20 20-30 30-40 40-50 N
O' 4
690 3,b42 8.694 210 1,150 535 781 304 MNE O
O 86 4,002 1,153
'131 2,241 870 825 822 i
KE O
O 115 4.318 3,310 7,045 11.572 21,662 5,220 41,587 ENE O
O O
676 820 4,277 47,051 4,338 4,000 18,925 E
3 J
0 892 5,613 22.408 341,737 188,251 147.971 89,996 ESE O
O O
72 9,644 65,555 272,816 811,904 1,075.509 834,921 sE 0
0 58 303 7,774 32,012 50,693 585,058 1,042,501 811,545 s5E 0
20 14 0
360 2.384 10,165 0
38,612 12.422 s
0 0
0 29 130 1.465 1,912 0
0 0
SSW 0
0 0
0 2.995 3,604 2,928 0
0 0
sw 0
6 0
0 892 6.871 3,194 0
0 0
Wsw 0
0 0
0 0
35,903 19,615 37,296 0
0 W
0 0
0 0
0 5,809 33,993 158,872 26,144 0
WW 0
0 0
2,692 4.644 1,778 11,548 22.460 24,688 13.578 tN 0
43 4,894 9,961 9.356 1,740 5,731 5,856 793 117 NW 0
0 4,606 12,666 3,527 13 7,116 54 69 1,018 Total 0
67 10,463 39,253 58,932 191,205 824,182 1,837,156-2,367,113 1,825,235 Total = 7,153,606.
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.4-3.
LAND USE The NDFL is located in southeastern Ventura County near the crest of the Simi Hills at the western border of the San Fernando Valley. The Simi Hills have never supported intensive farming or development because the terrain is too rugged and rocky. Today, about 73% of the area in a 5-mile radius of NDFL is undeveloped (Table 2).
The closest residence is about 1.25 miles south-southeast of Building 005 of the NDFL. Dense residential development begins in the San Fernando Valley about 3-1/2 miles east of Building 005.
Homes are rapidly replacing the farms located there (Table 2). Sweet corn and hay for nearby pleasure horses appear to be the primary crops.
Other trv9 farms occur in the Simi Valley, 3 miles north, and in the Thousand Oai Area, 9 miles southwest of the site.
Tab 6e 1 Land ens in SeBe sadnes of NDPL Percent af total eres (75.5 se miles)
Agriculture (includeg livestock O.1 and cross)
Cornmercial 0.4 Industrial
<D.1 Residential 25.8 Unused row land 72.9 Total 100.0 Source: Rockweil Intemational, Atornics imeme-
- t. anal 0; vision, Ansivers to "Cbestions Asderive as Envwearneresef Asuserts af Asenacs /movisoonsf1r Nuataar fuel Fecdrtnat et Las Annotas CalMenmis "
Canoen Park, Calif., Deenneer 1976. C6ssnan 11, Tante 4.
According to a vegetation map drawn in 1931 of western Los Angeles County and southeastern Ventura County I (Figure 3), the area at that time consisted of about 31% farm and urban land.
It is apparent from the map that almost all this land exists in the San Fernando Valley.
Today, agriculture (including livestock) covers about 0.1% of the area in a 5-mile radius of the Headquarters site (Table 2).
3 During a site visit, the staff noted a few acres of immature avocado orchards and one apiary both on private land immediate'y adjacent to NDFL. Data on prime or unique farmlands 2 in the region which could be affected by the AI facility were not available. The NDFL site contains no farmland of any type, nor does it introduce effluents that could threaten fann products; thus, the data omission is not considered.important.
Reservoirs existing near the site are used primarily for irrigation, flood control, and recreation.
Chatsworth Reservoir, 4 miles east of Building 055, is currently dry, and it is expected to remain so until a decision is made and li..Amented to replace the present earthen dam with the required reinforced concrete structure.
Supplemental city water supplies are drawn from the Van Norman Reservoir (8 miles east-northeast) and the Encino Reservoir (8 miles southeast).
a e
l l s Santa Ana winds are frequent (about 21% of all hours) at the site and are caused by centers of high pressure to the north and northeast of the site.
Winds at the site during Santa Ana conditions are typically from the NE and usually are cuite strong [all but two of the 191 hours0.00221 days <br />0.0531 hours <br />3.158069e-4 weeks <br />7.26755e-5 months <br /> with wind speeds 8.7 mps (17 kts) at the site in 1976 occurred during Santa Ana conditions.]
K gust of 31.9 m/s (62 kts) was recorded on the site during. Santa Ana conditions.
4.4 Dispersion Characteristics of the Site Atomics International has supplied one year (1976) of onsite wind speed and direction data. Wind speed and direction are measurad by an Aerov.ne at 5 m (15 ft) above grade on the ridge line of Simi Hills about 3 km (2 mi).east of the NDFL building. Wind direction is measured by eight compass points.
Table 3 is a joint frequency distribution of wind speed by wind direction for 1976.
The data shows a high frequency of calm and variable wind conditions (20.1%). Of the 6949 hours0.0804 days <br />1.93 hours <br />0.0115 weeks <br />0.00264 months <br /> of measurable wind, E888 hours (85%) were from only three directions: NE, SE and NW.
In many cases, there was a wind shift during the hour prec, ding a hourly wind recording; wind speed and direction e
tabulated for that hour in Table 3 was the one with the lower wind speed (a conservative assumption). Winds too light to measure or maintain a valid wind direction trace due to instrument response were tabulated as " calm" or
" variable" on the data sheets and listed as " calm" in the tables below.
The AI weather observer recorded on his logs the presence or absence of Santa Ana conditions.
Tables 4 and 5 are joint frequency distributions of the occurrence of Santa Ana or non-Santa Ana conditions during the day and night hours. As expected, almost all winds (> 11 kts) and most NE winds occur during Santa Ana conditions. Also shown in tee tables is the high frequency of calms at night.
4.5 Stability Class No onsite measurement of atmospheric stability is available; the stability class at the site under most conditions would be differe ' Trom that measured at the Burbank Airport. Therefore, a " synthetic" stabi.lity classification procedur.e was developed by meteorologists from NRC, ANL and AI to provide a more accurate estimate of dispersion.
The data were first stratified into the four subsets listed above and tabulated in Tables 4 and 5.
Class C (slightly unstable) stability class was assumed for nighttime Santa Ana conditions, and 50% Class A and 50% Class B for daytime Santa Ana conditions. These classes reflect rapid dispersion rates occurring during such air flow.
D 1
For non-Santa Ana conditions, stability class selection depended on time of day and wind speed, according to the following criteria:
NIGHT Wind Speed (m/s)
C1.?ss(es)
Cala F, G 0.5-3.1 F, G 3.7-5,1 D, E
> 5. 7 D
DAY Calm B, C 0.5-3.1 B, C 3.7-5.1 B, C
_t_ 5. 7 C, D (where two classes are listed, 50% frequency of occurrence were assigned to each).
The classes selected should result in somewhat conservative (that is, relatively high) concentration values.
Tables Sa-5g are joint frequency tables of wind speed and direction by stability class.
The stability classification technique release used leads to some unueual distributions.
For example, Class A was assumed to occur only with Santa Ana winds.
However, in the real atmosphere, this class occurs during the day with light wi ds and intense insolation).
The frequencies of. Classes D and E (neutral n
and weak-stable) are very low, 2.4% and 1.4% respectively.
Unstable conditions (Classes A, B and C) have a very high frequency (55.4%), reflecting good dispersion conditions at this elevated site which is usually above the subsidence inversion, and exposure to Santa Ana winds.
4.6 Relative Concentration Values -
Table # 2 hows the distribution of relative concentrations (x/Q)at various locations Although the wind distribution is trimodal (Tables 3, 4, and 5) QD0Q program,5 arout ae site, based on the data from Table 5 and the NRC's X0 the x/Q. values are bimodal, with large values to the NW and SE, Although NE winds occur 13.7% of the time, the calculated x/Q values SW of the site are relatively low.
The r.ajority of winds from the northeast occur with Santa Ana conditions, when wind speeds are above average and dispersion rates are high.
A