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Distribution,: Docket File / DCS - !'.A: m.. Project File M-3 LCRouse WBurkhardt JEAyer JShafer Docket No. 70-25 NMSS R/F M3 FCAF R/F
MEMORANDUM FOR: Leland C. Rouse, Chief Advanced Fuel and Spent Fuel Licensing Branch
FROM: J. E. Ayer/W. Burthardt Advanced Fuel and Spent Fuel Licensing Branch
SUBJECT: DESCRIPTION OF SITE. ENVIRONMENT AROUND THE ATOMICS INTERNATIONAL NUCLEAR DEVELOPMENT FIELD LABORATORY, CHATWOR111, CALIFORNIA
The purpose of this memorandum is to recomend endorsement of the attached review as a staff position and a basis for succeeding increments of the analysis of the effects of natural phenomena upon existing plutonium fabrication facilities. The subject report is excerpted from an update site description provided in the Environmental Impact Appraisal of the Atomics International (AI) Connercial Nuclear
Fuel Fabrication Facilities, Canoga Park and Chatworth, California _ that was published September 1977. As such we feel that it needs no 1 further coment before acceptance. We recomend that this review including its sumary and conclusions be adopted as a staff position subject to your approval. Subsequent to your approval we will make copies available to the public and to Atomics International in accordance with review and documentation procedures agreed upon and described in our February 10, 1977 memorandum to R. M. Bernero. |3 J. E. Ayer Advanced Fuel and Spent Fuel Licensing Branch
W. Burkhardt Advanced Fuel and Spent Fuel Licensing Branch
. i Approved by Leland C. Rouse, Chief | ' Advanced Fuel and Spent Fuel Licensing Branch Divi n of Fuel Cycle and Material Safety . Enclosure: Af stated ~. D. , FCA,FM omce >.f% E.Ad ,,,,,, , ,,,,,,, ,,,,,, ,,,, , ,,, ,, ,, ,,,, , .f... ,LCRo,${,, _.->gg.:.m . mudr.i,. . , ,,,,, , ,,,,, ,, , ,, , , , ,,,,, .. o^ic k.3/$//80.... 3/5 ygg. . gj..fgo. .. .. , ,, ,, , , , ,,, , ,, A I / ,
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DESCRIPTION OF SITE ENVIRONMENT
the physical, biological, andThis cultural description environment provides of the basic Atomics information International concerning(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 location of that facility relative to surrounding comunities. 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 within a 5-mile radius. ' - .. __ __
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Figure 2 provides an aerial view of the NFDL site, Tne valley in the left background is the Simi Valley. The area in the far right background is the western end of the San Fernando Vall.ey,
2. DEMOGRAPHY
The 1980 projected population distribution near the NFDt. is shown in Table~ 1. Approximately 46,000 persons are estimated' to live within a 5-mile radius of the NFOL facility; the nearest resident lives 2,3 iniles.~ 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.
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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 7 alley. 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 dwellings are in Bell Canyon, about 2.3 miles from 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 truck farms occur in the Simi Valley, 3 miles north, and in the Thousand Oaks Area, 9 miles southwest of the site.
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Agrieultare (inusuding livesteak G.1 and enemi , ^ Canunereid 0.4 . , ladhserial . ae=d-*d * as - . thiumed rowland - 72.8 . |' Tout 5 ! ! . . , Seures Reasmsed faternatierut. Atomia Inesmo. ' tiense Oleieion. Ansies,. e -Ommass. Asdselse m aumwousemeest Asserer e/ Amsmie hvemviseensvir . m A t i.eam. .e t e c.w - s r im, a sde. it. r - y e =. emf., o , ' 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). ' ' During a site visit, the staff noted a few acres of immature avocado orchards and - one apiary both ed private land immediately 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 farm 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 implemented 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 (8milessoutheast). , . e _ . - 4a- . . . ". ,3 . .' s yjjsi '3W .. ::, (s:a. M' , .y,,n n ,0~f~ 0 4 ' . m,i,qw= +uu.yn.w,kTif.+|:.n53gs;t. ' s g .+ g * s ($' 'q'.. i ;;. a .c u ' t .s .;; "s . a . 0.. .'0 . v.n 1 "e v, .n.gi f. . e ."r %s0,cOs %',,0, . . a na a.n.e n n .- ~* * Og g g p , gp g g n r. ga ;; , 4, ,, ;[ s - < * ' //././.r tr"asj", * . . i.8. * g '* s% , .- . . " . g S U ',\* .s :: -. 't.l . . LIE.g .yuA. 58 '4.V .M.*r...8... l : 40 ; ,r n n.v r.r. ..v n ne.r f.:... .*'.!:s'. ...u*t .:- .X.' %.s . . o' %0, o,,s ,s % ,s : v s | ~ r >r :.. . e r.,s . .,.. .,. r.,. n . ,. r r. ,.v,.r. - ,. . ' , , ~ 'ss s / . n n v. . r: + ess . ' w,% 39; :...,.,.9,yi '!. . -| n~ ' ,, .\t , ,s z':NO.F).:' , y s O ''e !! '"|"crs . ':-i;A-?+.rua :4Wr *.P.r ' a+:4 AT W4: . , s ..'. ;.- . O o . n f.,c.'~ gSggmig .g.gggy ay,p.',., . . 'y;;.;;; s' +s , o s ,': . ?/M BARREN @ SAGEBRUSH . V///d/ SEMISARREN (Crosshotch over any type) %.4 CHAPARRAL SHRUB s * -- ~ * GRASSLAND ** WOOOt.AND TREES CULTIVATED " . Mit.ES O t 2 3 4 I t i I t- I n a 6 O 6 e i t 2 3 4 5 6 . KILOMETERS .2 . . .. - - Figure 3. Vegetation map (193T) of area surrounding the NCFl. site. Source: U.S. - Department of Agriculture, U.S. Forestry Service, Vegetation Tynes of California, Calabasas Quadrangle, Sheet 1610, Berkeley, California,1938. . 6 , , . 4p. ..ee.,e-e.. -Oe * * * '* 4 . . 1 , , - . , . i | , * -5- ! i ' , 4. METEOROLOGY - CLIMATOLOGY I 4.1 Regional Climatology , i The climate of the Los Angeles Basin may be characterized as Mediterranean, t with hot, dry sunners and mild winters with light to hnoderate precipitation.3,4 Local climate is controlled by the position and strength of the Pacific semi- permanent high pressure area and its subsidence inversion, local topography, and distance from the ocean. In summer, this high pressure cell controls air flow over the basin and prevents rain-producing weather systems from entering the area. Sunner weather is typically a succession of clear, cool nights and hot, sunny days with light to moderate winds and no rain. Sea breezes frequently affect the NDFL site and moderate afternoon temperatures. In winter, the high pressure center weakens and moves to the south and west allowing storms originating over the Pacific Ocean to enter the area, producing periods of clouds, rain, northerly to northwesterly winds and occasionally strong winds. Year-to- year variations of rainfall are large. 4.2 Local Climatology ! No long- term temperature or precipitation- data are-collected at or near the site. The long-tenn climatological data for Burbank, California, about 25 km (15 miles) ESE of the site, are considered representative of on-site conditions.3,4 The ' airport is at 699 ft (213 m) MSL, while the site is at 1824 ft (556 m) MSL. The nonnal annual temperature at the airport is 17.6'C (63.6'F); monthly normals vary from 12.0*C (53.6*F) in January to 23.4*C (74.l'F) in August. Normal annual precipitation is 369 mm (14.53 in); monthly range from a trace (less than .25 mm or 0.01 in) in July to 82 mm (3.22 fn) in February. , . 4.3 Site' Meteorology The NDFL is usually above the base of the subsidence inversion associated with ' the Pacific high pressure ridge (while the Burbank Airport is not), resulting , in lofting-type dispersion conditions. The vertical stability of the inversion - layer prevents the mixing of materials released above the inversion downwards to the basin. In sunser, locai wind patterns generally are determined by the effects of local topography and diurnal heating and cooling. Up-valley, up-slope winds along the south slope of the Simi Hills result in light SE winds in the morning at the ' site. Modified maritime air often covers the site as a result of sea breeze currents in the afternoon. During the night, radiation cooling leads to Tight down-canyon, down-slope winds. In winter, the Pacific hich weakens and moves to the south and west, allowing ' fronts and wave cyclones from the north Pacific to occasionally enter the area. Most rainfall in the area is a result of this frontal activity. : . | . ______-. - -- . - . -- - . - . __. _ ____s.4m. - . . _ . . i . -6- ) ' . I 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 Aana conditions are typically from the NE , and usually are quite strong [all but two of the 191 hours .2 8.7 mps (17 kts) wind speeds at the site in 1976 occurred dur_ing Santa Ana co,nditions]. A 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 dir9ction data. Wind speed and direction are measured by an Aerovane 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. 1 , Table 3 is a joint frequency distribution of wind sp'eed by wind direction for ' ! 1976. The data shows a high frequency of calm and variable wind conditions ; (20d%). Of the 6949 hours of measurable wind, 5888 hours (85%) were from | ) only three; directions: NE, SE and NW. In many cases, there was a wind shift ! during the hour preceding a hourly wind recording; wind speed and direction 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 " variable" on the data sheets and listed a " 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 e at the site under most conditions would be different from that measured at the ~ Burbank Airport. Therefore, a " synthetic" stabi.lity classification procedure was developed by meteorologists from NRC, ANL and AI to provide a more accurate estimate of dispersion. The data were first stratifi'ed into the four subsets listed above and tabulated in Tables C and 5. - Class C.(slightly unstable) stability class was assumed . for Santa Ana conditions, and 50% Class A and 50% Class B for daytime Santa Ana ...... conditions.. These classes. reflect rapid dispenion rates occurring during such .. air flow. ; ) . .~ _ _ _ ._. _ _ _ , , _ _ _ _ _ , , _. __ _ . ._. . -._ . _ _ . - . __ _... _ ,- . . STABILITY CIASS AIL Atomics International Santa Susana, Ca. 1865 ft MSL 1976 Speed (KTS) 1-3 4-6 7-10 11-16 17-21 > 21 Total N .76 1.31 1.51 .75 .05 -- 4.38 NE .22 1.41 3.96 6.00 1.92 .21 13.72 - E .92 .48 .19 - - 1.59 SE 13.01 12.49 2.25 .09 - -- 27.85 - - S 1.31 .98 41 .01 2.71 SW .69 1.34 .44 .02 - - 2.50 W .38 .20 .18 .14 -- - .90 NW 4.26 10.45 9.96 .76 .02 - 25.46 Total 21.55 28.67 18.92 7.78 1.99- .21 79.11 Calm and Variable 20.14 ' - \ Missing ,3 0.75 - \ . . . _ _ . _ . . . _ - . . _ . _ __ .. .-..-. ..__ . . 1 . . _ _ _ . . , . Table 3. Joint frequency distribution of wind direction by wind speed interval. Atomics International Facility on Simi i : Ridge, Santa Susana, California, 1976 (as percentage i of8784 observations).- | | i e * Day Wind Spred and Dir:ction . . Atomics International 1976 1865 ft MSL . Day Conditions (%) Total - 1-3 4-6 7-10 11-16 17-21 > 21 (KTS) * - - 0.73 j N . .21 .29 .22 .02 * NE .02 .17 1.40 2.82 1.12 .15 5.68 ! - " - - - - E .01 J (as % of 8784 hours) 6.43 N .18 .41 .38 .13 - - 1.10 - NE .02 .19 40 .17 - .79 - - - . E .17 .22 .10 .49 E - - 13.88 e SE 4.93 7.41 1.50 .05 " e - - S .65 .76 .31 .01 1.74 |:: - $ SW .47 1.10 .39 .02 - - 1.97 W .24 .10 .15 .10 - - . .59 NW 1.19 6.45 9.10 .62 .02 - IM Total 7.83 16.60 12.28 1.69 .02 37.83 , Calms 4.44 , Missing .28 - Table 4. Joint frequency distribution of wind speed and direction during daylight hours at the Atomic International Facility on Simi Ridge, California, 1976 (as percentage of 8784 observations. - = - _ _ _ _ _ -_ _ _. -_ _ __. . Night Wind Speed and Direction Atomics International 19.76 1865 ft MSL . Night Conditions (%) 1-3 4-6 7-10 11-16 17-21 , > 21 (KIS) Total N N .23 .24 .20 .02 - .71 , .01 u j NE .06 .74 1.96 2.98 .80 .06 6.60 7.31 N. .57 .47 .61 .20 - - 1.86 NE .11 .31 .20 .03 - - .66 E .26 .09 - - - 1.09 , .74 'E SE 8.09 5.10 .76 .05 - - 14.00 3 E S .66 .22 .10 - - - .98 - Y ' E SW .23 .25 .06 - - - .54 2 W .14 .10 .03 .03 - - .31 NW 3.07 4.02 .89 .15 - - 8.13 . Total 13.62 10.72 2.76 .47 - - 27.56 , Calma 15.70 Miasing' . ,47 Table 5. Joint frequency distribution of wind speed and direction during night-time hours at the Atomic International Facility on Simi Ridge, California, 1976 (as percentage of 8784 osservations. | , . I . . . . . - ._ . - - . . . - - . _- . _ - ______. . -7- For non-Santa Ana conditions, stability class selection depended on time of day and wind speed, according to the following criteria: NIGHT WindSpeed(m/s) Class (es) . Calm F, G 0.5-3.1 ! F, G ! 3.6-5.1 D, E ! ' >_ 5. 7 0 DAY . Calm ~ B, C . 0.5-3.1 B, C 3.7-5.1 B, C i >_ 5. 7 C, D 1 (where two classes are listed, 50% frequency of occurrence were assigned to ' each). | The classes selected should result in somewhat conservative (that ,is, relatively i 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 ; unusual 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 , , winds and intense insolation). The frequencies of Classe.2 D and E (neutral - and weak-stable) are very low, 2.4% and 1.4% respectively. Unstable conditions 1 (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 6 shows the distribution of relative concentrations (x/Q.at various locations around the site, based on the data from Table 5 and the NRC's X0QD09 program,5 Although the wind distribution is trimodal (. Tables 3, 4, and 5) the x/q.yalues 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 16w, The majority of winds at the site occur with Santa Ana conditions, when wind speeds | are above average and dispersion rates are high. : 1 . G , - . . , , - , , .-- . * | . < . - S7ASILITT CLASS A Atomics International Santa Susana, Ca. 1865 ft NSL 1976 ; Speed (KTS) ''~ 1-3 4-6 7-10 11-16 17-21 721 Total N - .10 .14 .11 .01 - 0.36 NE .01 .09 0.70 1.41 .56 .08 2.85 E ------ ------SE . , S ------ ' Sw ------ W - - - - - _ - Nw ------ ' Total .01 .19 .84 1.51 .57 .07 3.20 Calm and Variable 0.00 Total Class A 3.20 . I Table Sa. Joint frequency distributions of wind speed and direction - by stability class. Atomics International Facility on Simi Ridge in Santa Susana, California,1976 (as percentage of 8784 observations. , , .'- . .. - . _ _ . . . . . STABILITY CLASS B, Atomics International Santa Susana, Ca 1865 ft MSL 1976 Speed (KTS) 1-3 4-6 7-10 11-16 17-21 > 21 Total N .09 .32 .15 .11 .01 - .66 NE .02 .17 1.70 1.41 0.56 .07 2.94 E .09 .11 ------.20 SE 2.46 3.7J - -- - - 6.15 . E .33 .38 ------, . 71 SW .24 .55 - - - - .78 W .12 .05 - - - - .17 * NW .59 3.22 - - - - M .08 15.42 Total 3.96 8.52 1.85 1.52 .57 , Calm and Variable 2.22 Total, Class B, 17.64 . r Table 5b. Joint frequency distributions of wind speed and direction by , stability class. Atomics International Facility on Simi | Ridge in Santa Susana, California,1976 (as percentaga of 8784 observations. - 1 1 1 I ._ . _.. _-______. . . STABILITY CLASS C Atomics International. Santa Susana, ca. 1865 ft MSL 1976 Speed.(KTS) ' 1-3 4-6 7-10 11-16 17-21 7 21 Total N .10 .43 .62 .29 .02 -- 1.44 NE .07 .84 2.36 3.07 .80 .06 7.19 E .09 .11 .10 - - - .30 SE 2.46 3.70 1.50 .02 - - 7.67 S .32 .38 .31 - - - 1.02 . SW- .23 0.55 .39 .01 - - 1.'18 W .12 .05 .15 .05' -- 00 .37 - 13.20 NW .59 3.22 9.10 .31 .01 - Total 3.98 9.27 14.48 3.73 .84 .06 32.37 * Calm and Variable 2.22 Total, class C 34.59 * Table Sc. Joint frequency distributions of wind speed and direction by stability class. Atomics International Facility on Simi , Ridge in Santa Susana, California,1976 (as percentage of - 6784 observations. . P i 1 a STABILITY CLASS D_ Atomics International Santa Susana, ca. 1865 ft MSL ,1976 Speed (ItTS) 1-3 4-6 7-10 11-16 17-21 > 21 Total . I - - .36 .26 - - .57 NE - - .10 .11 - - .22 E - - .05 -- -- - .05 SE - - .38 .08 - - .45 S -- - .05 .01 - - .06 SW - - .03 .01 - - ,04 . - W - - .01 .08 - - .10 W - - .44 46 .01 - .91 ==== Total - - 1.38 1.01 .01 - 2.40 . ' Calm and Variable 0 Table 5d. Joint frequency distributions of wind speed and direction by stability class. Atomics International Facility on Simi Ridge in Santa Susana, Calif xnia, 1976 (as percentage of * 8784 observations. , * | _ _,. _ _ _ . _ _ _ . ______. . _ _ _ . . . _ -. - . . STABILITT CLASS E Atomics International Santa Susana, Ca. 1865 ft MSL 1976 , Speed (KTS) 1-3 4-6 7-10 11-16 17-21 >21 Total N - - .31 - - - .31 NE - - .10 - - - .10 E - - .04 - - - .04 - .. - -- SE .38 . .38 S - - .05 - - - .05 ------3W .03 .03 , ' W -- - .02 - - - .02 Nw - - .45 - - - .45 - Total - - 1.38 - - - 1.38 ! . Calm and Variable 0 | Total, Class E, 1.38 | | I i Table Se. Joint frequency distributions of wind speed and direction by , stability class. Atomics International Facility on Simi- | Ridge in Santa Susana, California,1976 (as percentage of , ! 8784 observations. - ! | | [ . 0 . -. -. - - ~- ______------. . - - - . - - - - STABII.ITY CLASS F Atpmics International Santa Susana, Ca. 1865 ft NSL 1976 Speed (KTS) 1-3 4-6 7-10 11-16 17-21 '> 21 Total N .28 .23 - - - - .52 1 NE .05 .15 - - -- - .21 . - - E .37 .13 -- - .50 - - SE 4.04 2.55 - - 6.60 S' .33 .11 -- - - - .44 - SW .11 .12 - - -. .24 * - - - - .12 W .07 .C5 , NW 1.53 2.01 - -- - - 3.55 - - Total 6.81 5.38 - - - 12.17 . Calm and Variable 7.85 . Total, Class I = 20.02 Table 5f. Jo' int frequency distributions of wind speed and direction by stability class. Atomics International Facility on Simi , Ridge in Santa Susana, California,1976 (as percentage of 8784 observations. , , i . I , 1 . - _ . . . STABILITY CLASS G Atomics International , - Santa Susana, Ca. 1865 ft MSL 1976 Speed (KTS) ' 1-3 4-6 7-10 11-16 17-21 > 21 Total N .29 .24 - - - - .52 - NE .06 .16 - - - .21 E .37 .13 - - - - .50 - SE 4.05 2.55 - - - 6.60 ------44 S .33 .11 SW .12 .13 - - - - .24 , W .07 .05 - - - - .12 - . W 1.54 2.01 - - -- - 3.55 Total 6.81 5.36 - - - - 12.17 . Calm and variable 7.85 . Total, Class G 20.02 Table 5 g. Joint frequency distributions of wind speed and direction by stability class. Atomics International Facility on Simi , Ridge in Santa Susana, California, 1976 (as percentage 8784 observations. , l , - | 1 1 | | | . , - m. -* - - . , ' . > Table 6. Annual Average Relative Concentrations (s/m3) Based on Continuous Ground-Level Release and One Year of Onsite Meteorological Data from the Atomics International Facility, Chatsworth, California. , Distance (mi) Sector 0.5 1.0 2.0 4.0 10.0 25.0 50.0 N 5.9-6* 1.8-6 6.3-7 2.4-7 7.0-7 2.2-8 9.4-9 NNE 4.0-6 1.2-6 4.2-7 1.6-7 4.6-8 1.5-8 6.2-9 NE 2.5-6 7.5-7 2.5-7 9.2-8 2.7-8 8.5-9 3.6-9 ENE 2.0-6 6.0-7 2.0-7 7.5-8 2.2-8 6.9-9 3.0-9 ~ E 1.5-6 4.6-7 1.6-7 5.8-8 1.7-8 5.4-9 2.3-9 ESE 1.5-5 4.5-6 1.6-6 5.9-7 1.7-7 5.4-8 2.3-8 . SE 2.8-5 8.7-6 3.0-6 1.1-6 3.3-7 1.0-7'. 4.5-8 SSE 1.6-5 5.1-6 1.8-6 6.7-7 2.0-7 6.2-8 2.6-8 5 5.1-6 1.6-6 5.6-7 2.1-7 6.2-8 1.9-8 6.3-9 SSW 3.3-6 1.0-6 3.5-7 1.3-7 3.8-8 1.2-8 ~5 2-9 4 SW 1.7-6 5.1-7 1.7-7 5.8-8 1. 6-8 5.2-8 2.3-9 1 WSW 3.9-6 1.2-6 4.2-7 1.6-7 4.6-8 1.4-8 6.2-9 W 6.1-6 1.9-6 6.8-7 2.6-7 7.6-8 2.4-8 1.0-8 WNW 3.8-5 1.2-5 4.1-6 1.5-6 4.6-7 1.4-7 6.1-8 * NW 6.9-5 ' 2.2-5 7.5-6 2.8-6 8.4-7 2.6-7 1.1-7 . NNW 3.7-5 1.2-5 4.0-6 1. 5- 6 4.5-7 1.4-7 6.0-8 . * Scientific notation. 5.9-6 = 5.9 x 10-s, . , _ _ -_ , -- - .- .. . -8- Table 7 shows x/Q values calculated from five years of MWS data at the Burbank Airport, and Table 8 shows the ratio of the two x/Q values. (A value less than 1.00 indicates that the value calculated from the onsite data are lower than that from the airport data). At 1.6 km anduse of higher'onsite data values (yields lower x/Q (by a factorin 10 sectors, of up to 3)(1 mi) the up to a factor of 14) in 8. - The accident case (short-term, up to.2-hr) relative concentrations have been computed, using t dispersion model,geTables onsite 7a meteorological and 7b. The modeldata and is direction-dependent the NRC's accident and calculates the x/Q values out to a distance of 5 bn (3 mi) immediately following the natural destructive event. This calculation computes that x/Q values that are exceeded 5% and 50% of the time as a function of distance and direction. This model includes allowance for plume meander during light-wind and stable atmospheric conditions. , - e S 9 . | | ' | ' __ _ _ _ . _ _ . - . -_ . . _ _ _ . . - - . \ . ' Table 7. Annual Avera9e Relative Concentrations (s/m3) Based on Continuous Ground-Level Release and Five Years of Burbank Airport Meteorological Data ,, Atomics International Facility, Chatsworth, California. - , ' Distance (mi) i Sector ' 0.5 1.0 2.0 4.0 10.0 25.0 50.0 N 9.4-6* 2.8-6 9.3-7 3.2-7 8.8-8 2.5-8 1.0-8 NNE 6.4-6 1.9-6 6.5-7 2.3-7 6.3-8 1.9-8 7.5-9 NE 4.4-6 1.4-6 4.6-7 1.6-7 4.5-8 1.3-8 5.5-9 ENE 3.2-6 9. 8-7 3.3-7 1.2-7 3.3-8 9.9-9 4.1-9 E 4.6-6 1.4-6 4.8-7 1.7-7 4.8-8 1.4-8 5.9-9 - ESE 6.2-6 1.9-6 6.5-7 '2.4-7 6.7-8 2.0-0 8.0-9 SE 8.1-6 2.5-6 8.5-7 3.1 -7 8.8-8 2.6-8 1.1-8 SSE 8.3-6 2.6-6 8.8-7 3.2-7 9.0-8 2.7-8 1. 1.-8., S 7.0-6 2.2-6 7.5-7 2.7-7 7.7-8 2.3-8 9.3-9 SSW 3.6-6 1.1-6 3.8-7 1.4-7 4.0-8 1.2-8 4.8-9 SW 3.4-6 1.0-6 3.6-7 1.3-7 3.7-8 1.1-8 4.5-9 j WSW 4.2-6 1.3-6 4.6-7 1.6-1 4.6-8 1.3-8 5.5-9 i W * 7.1-6 1.2-6 7.5-7 2.7-7 7.6-8 2.3-8 9.2-9 , WNW ~ 1.0-5 3.1-6 1.1-8 3.8-7 1.1-7 3.1-8 1.3-8 NW 5.2-6 1.6-6 5.4-7 1.9-7 5.2-8 1.5-8 6.T-9 NNW 5.6-6 1.7-6 5.5-7 1.9-7 5.2-8 1.5-8 6.0-9 * 5cientific Notation. 9.4-6 = 9.4 x 10-6 . .. .- . - . . _ . -- - . . . . -- . . , Table 7a. Five Percentile Short-Term (2 hr) Relative Concentrations (s/m3) for the Atomics International NDFL Site Chatsworth, California.a .-- Distance in Miles (meters) . 0.09 0.31 0.62 1.24 3.1 Sector (145) (500) (1000) (2000) (5000) N 1.4-2b 1.7-3 5.9-4 3.3-4 ' l.6-4 NE 6.8-3 8.4-4 3.0-4 4.0-5 6.0-5 . E 2.9-3 4.5-4 1.0-4 6.6-5 2.4-5 SE 2.8-2 3.5-3 1.2-3 7.5-4 4.8-4 - . S 1.3-2 1.6-3 5.5-4 3.0-4 1.4-4 SW 3.7-3 4.9-4 1.7-4 8.0-5 3.4-5 W l.4-2 1.7-3 6.2-4 3.4-4 1.7-4 NW 3.8-2 4.6-3 . 1.6-3 1.0-3 7.2-4 . a Based on one year (1976) of onsite meteorological data and the NRC's short- term dispersion mcdel described in Re9ulatory Guide 1.145 (Ref. 4). ~ bScientific notation: 1.4-2 = 1.5 x 10-2 , c . ~ 9 I - . * . e I , 1 .- . . Table 7b. Fifty Peregntile Short-Term (2 hr) Relative Concentrations (s/m ) for the Atomics International NFDS Site Chatsworth, California.a Distance in Miles (meters) 0.09 0.31 0.62 1.24 3.1 (5000) Sector (145) (500) (1000) (2000) b 3.5 - 6 N 1.9 - 3 2.2 - 4 7.2 - 5 2.2 - 5 1.0 - 6 NE 7.0 - 4 6.9 - 5 2.0 - 5 5.5 - 6 1.2 - 5 3.5 - 6 E 1.5 - 3 1.7 - 4 5.6 - 5 1.0 - 4 3.5 - 5 1.1 - 5 2.0 - 6 , SE 8.0 - 4 2.0 - 6 S 9.0 - 5 8.2 - 5 2.4 - 5 7.2 - 6 2.0 - 4 2.1 - 5 5.9 - 6 1.7 - 6 3.7 - 7 SW . W 5.3 - 3 6.4 - 4 2.0 - 4 1.4 - 4 5.6 - 5 ' 2.7 - 5 NW 3.5 - 3 4.0 - 4 1.3 - 4 6.5 - 5 - a Based on one year (1976) of onsite meteorological data and the NRC's short- term dispersion model described in Regulatory Guide 1.145 (Ref. 4). , bScientific notation 1.9 - 3 = 1.9 x 10-3 _. * .. . . . I Table 8. Ratio of Relative Concentration Values, Onsite Meteorological Data, Burbank Airport Meteorological Data. Distance (mi) Sector 0.5 1.0 2.0 4.0 10.0 25.0 50.0 N .63 .64 .68 .75 .80 .88 .94 NNE .63 .63 .65 .70 .73 .79 .83 NE .57 .54 .53 .58 .60 .65 .65 ENE .63 .61 . 61 .63 .67 .70 .73 C * .33 .33 .33 .34 .35 .39 , . 39' ESE 2.42 2.37 2.46 2.46 2.53 2.70 2.88 SE 3.46 3.48 3.53 3.55 3.75 3.85 4.09 SSE 1.93 1.96 2.05 2.09 2.22 2.30 - 2.39 5 .73 .73 .75 .78 .81 .,83 .68 SSW .92 .91 .92 .93 .95 1.00 1.08 SW .50 .51 .47 .45 .53 .47 .51 WSW .93 .92 .91 .96 1.00 i.08 1.12 , W .86 .86 .91 .96 1.00 1.04 1.09 , WNW 3.80 3.87 3.73 2.95 1.22 4.52 4.64 NW 13.27 13.75 13.89 14.73 16.15 17.53 18.03 NNW 6. 61 7.06 7.27 7.90 8.65 9.33 10.07 i . . 9 - .-- -- .. . . . , __ _ . . __ - - _ - __ - . . . _g- 5. ECOLOGY 5.1 Terrestrial Biota The potential natural vegetation of the Simi Hills is mapped as chaparral.7 * This plant comunity foms a very dense vegetation of broad-leaved evergreen sclerophyll shrubs. It is dominated by either chamise (Andenostoma fasciculatum) or manzanita (Arctostaphylos spp.) and Califoynia lilac.(Ceanothus spp.); numerous other shrub species are subdominant. The vegetation map drawn in 1931I concurs with this description and adds further details. Figure 4 is an adaptation of this map, showing the area innediately It indicates that much of the Simi Hills crest was semibarrensurrounding 50".( . ------_. -- - - . . . - 10 - i 5.2 Endangered Species , There are 236 plant species in California classified as endangered.S Examination ; of their geographic distributions 10 indicates that nine of the species occur in Ventura County or adjacent Los Angeles County. These species are listed in Table. 9, along with information regardingtheir geographic distributions i and habitat preferences. ' Four of the species are unlikely to occur in the western San Fernando Valley or in the Simi Hills (Hermizonia minthornii,- Pentachaeta lyonii, Dudleya multicaulis, Astragalus tener var. Titi) because either their habitat preferences or their geographic distributions do not coincide with the sites. Of the remaining species, three are likely to be found in the Simi Hills (Dudleya cymo~sa, Dicentra ochroleuca, Eriogonum crocatum), ene would be limited to the valley (Chorizanthe leptoceras), and one' could occur at both localities (berberis nevinii). The latter two species are unlikely to occur in the western San Fernando Valley today because of the lack of nonurban habitat. The 24 species of terrestrial California vertebrates classified as endangered are listed with the geographic ranges and/or habitat preferences of eachil in Table 10. Of those listed, onl ' falcon, American peregrine falcon)yare three potential species residents (southern of thebald AI eagle, area. prairie This conclusion is based on nonspecific range descriptions, rather than on information indicative of.the presence of the birds at or near the AI sites. 5.3. Aquatic Biota Because there is no natural surface water at the NDFL site, there are no resident populations of aquatic biota. Bell Canyon, although containing flowing water i during periods of heavy rainfall (December through March) is merely a dry natural channel during most of the year. It therefore does not sustain a permanent population of aquatic biota. There is no information available on ; aquatic biota that may be p. resent in Bell Canyon during period of flow. , e . 4 | -+ % _ % ., , . ,--.-, rw. y-.--sy +- -syg. c,e.-my,s - - - g- ? . | Table 9.. enemmer.d we= =usin' of vs.u-o and ta Aaem6= es-re=.Cemam se. Pandy,puun,meses. M Hemitse and geoyesenv8 f. Asemens- Adesumpusmesomenef Chesarrel anne: Senee Steenne Mauemme e * 2. Assurene-e%nmensesheat Vasley yendend:ennemi Les Angdes Commmy Ome endt*r 3. Bartertdessee = Seesrw neand Ceessel sage sene and chesarref: San Fesumado VeNey 4. Creademmee-deefspo spuume Oteeneree:Samus Mermes Mounimire, som Venture Cassey , sust _ S. Cremrviemmes - Guess,e answamudar ChasenW:Las Angmies Cowwy S. Pahamme - Assugadus meer war. Ceestal strand; commed Les Angdes Commy fia( 7. Finneremme-Odssses estronmum Ocy dissweed missus below 3000 ft in admourrel: Les Asignins (Passeeremmass' - and Venesre asuntie 2 E. " - -Choussene Aussomme Coense sage serum and San Fernando Vammy S. ."J .- -Gugenese sumsame * Roadry steens at aheut 500 ft, asemas sage asse:neremns bee of Sanes Menies Mountains, Vessesre County # , *Prem Sadesonen famedanien, Aasser se andmasseif anW Thressessuf MawrSeemise#she GweefSamme, Serial Me,94 A.UA C- : Printing 0fese, Wesiingson, 04.1978. *Unies emarwise nessaL nemeneseme and rangs of homet frene P. A. Mune. 4 Mme e#SometernCadstamme, lanneruMy of CalHerne Press, sortoisy, Casf,1g74 . ! 'P=ney er em=. mmminassen from femoism a - ' . | . . - j, Tab 1's 10. unden, red s.swoof Cammade i Canunen none Mehitst and geopenny . L " Shaneciemedliaani Cuyeme Alvar Vei8ey, San Jessen Vesley . San Frenomme geriersnake San Franaimme eres Senes Cruslong,eoed setasmunder Santa Cnsa County, the lesenties Ommert siender- Senes Meme Mountame, Riverside County eney Tasummai elender ademander Kern County oney unusesrw ademaner * Menesse Cowny * . neuere seismander ' Lake Shame laye Counsy imed Inve Couney,oney Caufenuetre==a=Namn Aasmuse asiend. Venere Cowny, and seusi (40 ndsum sur of snel Aemnden Canade gerne e Osmamional winent visitor to normern Californis Tule= sues 4 enend geese WInsure in esmred CaHfernie , Caeifonele conder * Tahmahani Mountoms and nere (40 miles N et/must ' . Semesm teed eagle Neuesig Californie * * *, Prairie faimma Nemu la Bais Canfernie and paumtey in soumern Cusamude * Asnansen omreyine fuesen , Nasm in CaNieremie *Californie edesser rail ConwelCaliforno camt tagspfossed essosor red Senes Garture Couney and seue in soft meshoe , Yunus seasser redi Lauer Ceterado R%er ! CalWomieleast targ Gmsel Caelforme. San Preunions some to Seis Casiduude sossendoss Norearn Calliernse, seueern CaNiernia mounesset 9pues only Senes Seremre songsisrow Not assistie, asummed to be Sane Berture Couney Morre seg kneems,e ret * * San Luis omisse Ceumy, sandy seios en asumern sisseerasene say Seit Mande harvest niouse $sn Prunnese $sy region San Jamesin kit fem Wassene side of San Jeesuin Vaney, Kane Comney and sure * Seurser U.S. Deserenmut of the Inserter, Plan and Wilssefe Servies, Mbenemend lemer me Gefend Soest, Remeurue Peehension 114 UA C_ - -- _ Printing Offine,wadiinguen 04.1973. | . y, , - - . _ - __ - - - , . ._ . - , , . - - - - - _w, ,.-_ ,,,c-,v -- _. . _ . . o REFERENCES 1. U.S. Department of Agriculture, U.S. Forestry Service, Vegetation Types of California, Calabasas Quadrangle, Sheet 1610, Berkeley, California, 1938. 2. R. W. Peterson, Council on Enviornmental Quality, letter to Heads of Agencies, Aug. 30,197g, " Analysis of Impacts on Prime and Unique Farmland in Environmental Impact Statements." 3. " Climatic Sumary of the United States, Supplement for 1951 through 1960," California 86-4, ;l.S. Department of Comerce, Weather Bureau,1964. . 4. C. R. Eiford, "The Climate of California,'" Climates of the States, , Water Information Center, Port Washington, New York, pp. 538-594, June 1970. 5. " Methods for Estimating Atomospheric Transport' and Dispersion of Gaseous Effluents in Routine Releases from Light-Water-Cooled Reactors." Regulatory , Guide 1.111, US NRC Office of Standards Development, Washington, DC. 6. " Atmospheric Dispersion Models for Potential Accident Consequence ~ Assessments at Nuclear Power Plants," US NRC Branch Draft Technical Position Regulatory Guide 1.145, 1978. - 7. A. W. Kuchler, ' Potential Natural Vegetation of the Conterminous United States, American Geographical Society Special Publication 36, New York, New York,1964. . - 8. E. C. Jaeger and A. C. Smith, Introduction to the Natural History of j Southern California, University of California Press, Berkeley, California, 1966. 9. Smithsonian Institution, Report on Endangered and Threatened Plant Species of the United States, Serial No. 94-A, U.S. Government Printing Office, Washington, DC, 1975. , 10. P. A. Munz, A Flora of Southern California, University of California Press, , Berkeley, California, 1974. - 11. U.S. Department of the Interior, Fish and Wildlife Service, Threatened Wildlife of the United States, Resource Publication 114, U.S. Government Printing Office, Washington, DC,1973. . . . . - . - - --. ..