ML19341C518
| ML19341C518 | |
| Person / Time | |
|---|---|
| Site: | 05000192 |
| Issue date: | 01/01/1981 |
| From: | TEXAS, UNIV. OF, AUSTIN, TX |
| To: | |
| References | |
| NUDOCS 8103030681 | |
| Download: ML19341C518 (22) | |
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, 2. SITE DESCRIPTION
. 2.1 GENERAL LOCATION The TRIGA reactor facility is situated on the main campus of The University of Texas, City of Austin, Travis County, Texas (see Figures 2-1, 2, 3). The react,r is located near the center of campus in room 131 of Taylor Hall (see Figures 2-4, 5).
The central campus is located en the high point of a gentle knoll. The reactor site is located on the east slope and about fifty feet below the crest of the knoll and about forty feet above Waller Creek, two blocks away. The reactor site is 1.7 miles north and 3.0 miles east of the Colorado River, approximately 1.5 miles east , north, and west of branches of *.ne Missouri Pacific, Missouri Kansas Texas, and Texas New Oricans sSouthern Pacific) railroads, 0.6 mile west of Interstate Highway 35, 0.8 miles north of the Texas State Capitol building, 2.0 miles southwest of
- the Austin Municipal Airport and 8.0 miles northwest of Bergstrom Air Force Base.
2.2 SURROUNDING ACTIVITIES AND POPUI.ATION Austin is composed primarily of governmental, business, and profes-sional persons with their families. The city has substantial light industry but practically no heavy industry. The 1980 estimated population of Austin is 3',8,000, with the total Travis County Popt li.' ion estimated at 420,000 (Ref. 1). An estimated maximum of 61,500 persons are present within a radius of 0.5 mile of the reactor during normal working hours. This population consists mostly of students, faculty and staff of the university. All of the student population, 2-1 l l 1 810 30 3 00tM
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i II Chor.10ff I Room ls x - Graduate Offee ngore 1-5. TAYLOR HALL - FIRST FLOOR
l l t which represent more than 50% of the university campus population, is not expected to be on campus except during a few peak hours cach day. Table
- 2-1 and Figures 2-6, 7, present estimated 1976 permanent rcsident popula-tion densities (Ref.1) . The permanent resident population of the univer-sity campus area (census t.act six) indicates approximately 14,500 residents at a density of approximately 23 per acre which is at Icast twice the density of any other Travis county census tract.
The area to'the south of the university campus is occupied by buildings of the state of Texas government complex. Beyond the state office complex is the Austin central business district. Areas to the east, west, and north are mixed residential and cornercial arecs.
- 2. 3. CLIMATOLOGY Austin, capital of Texas, is located on the Colcrado River where the stream crosses the Balcones Escarpment separating the Texas Hill Country from the Blackland Prairies to the enst. Elevations within the City vary from 400 feet to 900 feet above sea level. Native trees include cedar, oak, walnut, mesquite, and pecan.
The climate (Ref. 2) of Austin is humid subtropical with hot summers. Winters are mild, with below freezing temperatures occurring on an average t of less than 25 days each year. Rather strong northerly winds, accompanied by sharp drops in temperature, occasionally occur during the winter months _ in connection with cold fronts, but cold spells are usually of short dura- ) tion, rarely lasting more than two days. Daytime temperatures in summer are hot, but summer nights are usually pleasant with average daily minima in the low seventies. Precipitation is f airly evenly distributed throughout the year, with
, , heaviest amounts occurring in late spring. A secondary rainfall peak occurs in September. Precipitation from April through September usually results 2-7
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TABLE 2-1 1976 POPULATION DENSITY DISTRIBUTION - TR,WIS COUNTY I Census Tracts Population Acres Density (Persons / Acre) 1.00 6,144 2,041 3.01 2.00 9,722 1,589 6.12 3.00 13,097 2,252 5.81 4.00 7,120 974 7.31 5.00 4,131 322 12.83 6.00 14,346 624 22.89 7.00 1,588 389 4.08 8.00 11,385 1,488 7.65 9.00 8,555 1,016 8.42 10.00 5,464 591 9.25 11.00 2,000 6 35 3.15 12.00 3,248 620 5.24 13.00 -- -- -- 13.01 5,650 872 6.48 13.02 12,893 1,495 8.62 14.00 6,009 877 6.85 15.00 -- -- -- 15.01 5,669 860 6.59 15.02 9,377 1,166 8.04
. 15.03 4,006 838 4.78 16.00 -- -- --
16.01 12,638 2,019 6.26 16.02 3,935 726 5.42 17.00 -- -- -- 17.01 15,040 4,372 3.44 17.02 10,060 3,227 3.12 18.00 -- -- -- 18.01 21,976 3,266 6.73 18.02 8k608 2,255 3.82 18.03 9,369 1,009 9.29 19.00 5,198 2,150 2.42 20.00 10,027 1,5/7 6.36 21.00 -- -- -- 21.01 23,273 3,144 7.40 21.02 11,962 2,572 4.65 22.00 3,904 2,400 1.63 23.00 -- -- -- 23.01 17,512 2,054 8.53 23.02 7,937 1.451 5.47 23.03 221 116 1.91 24.00 16,888 4,870 3.47 TOTAL 308,952 55,857 5.53 Acres computed by planimeter. 2-8 l 1
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from thundershowers, with fairly large amounts falling within short
. periods of time. While thunderstorms and heavy rains have occurred in all months of the year, most of the winter precipitation occurs as light rain. Snow is insignificant as a source of moisture, and usually melts as rapidly as it falls. The City may experience several seasons in suc-cession with no measurable snowfall.
The average length of the warm season (freeze-free period) is 270 days. Based on data from 1943-1961, the average date of the last occurrence of 32"F. in spring is March 3; the avetage date of the first fall occurrence of 32 F. is November 28. Previous records show that 32 F. or below has occurred as late as April 13 (1940), and as early as October 26 (1924). Meterological data is tabulated in Tables 2-2, 3, 4 (Ref. 2) . Prevailing winds are southerly throughout the year. Northerly winds accompanying the colder airmasses in winter soon shift to southerly as these airmasses move out over the Gulf of Mexico. Figure 2-8 summarizes typical Austin wind data (Ref 3). Destructive winds and damaging hailstorms are infrequent. On rare occasions, dissipating tropical storms effect the City with strong winds and heavy rains. The frequency of tornadic type activity is illustrated in Figures 2-9, 10 (Ref 4). 2.4 GEOLOGY The northwestern ali of n avis county is part of the physiographic province of Texas known as the Edwarde Plateau. In Travis County this is a highly dissected plateau with wooded hills rising in some places more than 500 feet above the drainageways. In marked contrast, the southeastern half of the county is gently rolling prairie lhal which is part of the physiographic province known as the Gulf Coastal Plain. These provinces
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STATION LOCATION AUSTIN, Tf.AAS s av a nu m mq=z.== mw~. _ _ l flee.noe aboee S.e G esund e77 te = AMOS j_ " Y = AUTot Lor.o s J t tn.de 4. 3: 3 i 1 i : l i 3 i 1 m I 1 mor tA t en s. seet *: j 8 - j e
=
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L L 4I 1* $ 2 J
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8 5 s: 1 { 1 '!. n 23 6 5 la[ at a - 2 sl n a : C.UI taginer.t 1906 4/01/2 3 30* L4 ' 9 F* d' $90 60 tm ,er .aies S Ildana y of true. 80 Cooper.tive etet ton. Emain.erieg Building 4/01/23 6/01,26 1/2 31. W 30* 17' 97* &&* 560 6 3 Coopetet ive et.t&oss. Et tversity of Ts aen fashneerina Building h/01/26 LO/1$/24 1/2 of.1sw 30* 17' 9 7
- 6. ' 570 6 3 Cooperative etecton.
tmivere t ty of fen.o n.m. ent . Lit tle f ielJ 10/l%/26 10/06 /M t-1/2 e1. b 3dJ' 17' 97' M' 491 t he tM 135 128
#i dg . . Si sc h & L + p e ns 128 w* ether sure.. Office.
a .g * , po4eral cc.,rt 2/12/42 10/f*/16 1/6 st. WW 30* 17' 91* 66' 540 79 66 66 60 60 B si t hs. 200 W. Oth we w..ther Burese of fice. he R01 PGP 2/12/62 8116/.1 30* 17' 97* A6 ' 495 E t t e let ten d pet idtag t /6 mi. st 168 L)5 135 128 128 we.ther Bures. Of fice.
& lath 6 Car aroes AQQ astmini me ras lan su e l d sas Alt 6/62 6/10/el 1 al . seitt 30* 18' 9 ?* 62 ' 61$ 12 6 5 3 ) Wind instrum.nte 64 f eet %mtenpot Aleport until 9/1)/ 37.
A> in t e r rat ion put t d ing 7/L'1/41 10/24/ F9 U . 7 mi . EF 30' 18' 97* 42' $97 20 b5 b5 isA 4601 Mear.s toed 3 3 .6 e - Coastsetaped 7/1/61. ah.u s ip. 6 A s r por t 6 = Discontinued F/1/63. W.ther Swe B l ig . 10/24/79 Present 1/6 et SE 30*17' 97*62' 172 $97 20 NA NA 20 $ $ 1 6 NA
% 6trMec.er RJ.
ip t etrpor t
- 53. 50 p y .c Pereig Sub ror sc r.iyti lost.,..r t c e : r Sing 30 cent.
me . . se.r.~d . - ,e t..er.er.+ t .e.r .e,n
,e Jte.,.
t.f.or o.rethl.y
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- i. .rie. f ,toe.ru.o.rd.er.of
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n nr.sure.r si 11 Lnge$1.9% i en.ed.i c.nter, ei ..ee of e,n.tre.,et redersi sii ion.l
. e.copy
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.23 c,ents.for
,.. i e t i.on.thly a.nd.ent of
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. or..,i. At.o. re r.. , nio .t tw erie min. .tr.no.s . -. is .*g,io, ,,yggf r9,fg,ggg Director, Wettonal Clim. cts C.nter USCE*9tdeOAA.ASKfY1LLE a H @g e
TABLE 2-4 0 2-14
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Miles per hour , pt [~_'.] 0- 7 Annual Frequency in Percent { Percentage frequencies of occurrence can be derived at {.9 I b10 any of the 16 conpass points by using the scale and E 19 and over measuring from the rerimeter of the cata circle. To obtain true wind direction, add 180' to those shown
@ IA ss t h In 0. 5% in the Nstern semi-circle; subtract It'O' from those shown in western semi-circle.
Figure 2-8. Wind Rose-Atist in, Texas 1951-1960 1 l 2-15 1 l l l
d 0.5
/
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--\ unas
cotmw oun,< us,
~ /-. 7. m
, -- 2.0
' 1.0 O.5 Figure 2-9 Texas Annual Tornado Density 2-16 i
a
t' i
%e$e x y%m$$ G W enewa 3%W h' I /,,h $Q&, %h g e0 $Y%Q$ ?
=,_Rf h m -
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[ y'? sgP 4 % --. M A; 4, ) %'t_. W. W q .= n a " * -~ Qg x :W k.:.e-wrea g,R c. mA 3 ,w. F~^ ~1 - N/+ ::', Nilays Co. 3(1) s- Istrop Co; 1(0) --- - vr ,; ( Kendall C
~
3(1) h Ghf j"h j, ;. y, Yf 2
. U 1' d[ ' 7 y Fayette Co.1(0) g y ,. $[gj@
, W-\-- omal Co 2(1) we1
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- TORNADO AND FUNNEL CLOUD J '\ .k OCCURANCES IN COUNTIES St k7 "-
- f 3M- " b N.b ,.4?e ?>JM it5L~ l JM
E k T *., Y k 8 W--- t- ,v' -Y6f/j$"# 1 hlMp>h s M~4 gr2 SURROUNDING AUSTIN FOR YEARS 1975-1979 n@ M _. Q-(g"I b N-"M7 R ) wl9 ~ & 'i;h M Q '"
- N \j$'.4 Travis Co. 7(3) indicates there were 7 tornadoes and b *'
E M
'hMMf FM $8 EM*
N' 3 funnel cloud.; reported 5$%$k...~ ' ASA.(" 'N [DC._N .f@Mf.Mg.- Sto La , - l(4 k*ih
~~
if et - .. The circle drawn has ' Mg / i % $/ j%<*"$% l' MMP*
- n. "'s/4 K '?c.~ #, >$ , ,3 E f
a 50 mile radius [%
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_4 Figure 2-10 2-17 s
are separated by the scarp of the Halcones fault zone, which rises 100 to
, 300 feet above the Coastal Plain. The scarp, however, is not a vertical cliff; it is an indented line of sloping hills leading up from the lower plain to the plateau summit.
The rocks that crop out in Travis County are primarily of sedimentary origin and of Mesozoic (Cretaceous) and Cenozoic age. They consist largely of limestone, clay, and sand strata which dip southeastward toward the Gulf of Mexico at an angle slightly greater than the slope of the land surface. Therefore, in going from southeast to northwest the outcrops
-of progressively older formations are encountered, and the rocks lowest in'the geologic column have the highest topographic exposure.
1 1 The Balcones fault zone, which extends from Williamson County to Uvalde County, extends the full length of Travis County on a line passing through Manchaca, Austin, and McNeil. llere the orderly sequence of formations is replaced by an out-crop pattern controlled by the faults, most of which are normal f aults with the down-thrown side toward the
, coast. Most of the movement of the Balcones Fault zone occurred during the Miocene period. Since no movement has been detected during modern i times, this fault is no longer considered active (Ref. 5).
2.5 HYDROLOGY Almost the entire county is drained b; the Colorado River and its t ribut aries. lake Austin and I.ake Travis, which are formed by the Tom Miller and Mansfield Dams, respectively, on the Colorado River, are part
- of the power, tlood-control, water-conservation, and recreation project l
., of the Lower Colorado Authority. l i . The Houston, Sligo, and Travis Peak formations are believed to be i the oldest and lowest formations beneath Travis County that of fer
)
I 2-18 i a f l
f l possibilities for ground-water development. These formations _ contain a
, number of sands, sandstones, and limestones known locally at the " Trinity 4
sands," which yield water that has a considerable range in quality. Yields of wells tapping the " Trinity sands" have a large range. West of the fault
, . zone the yields generally are small to moderate. Yields are greater in i
the f ault zone and to the east, with reported yield as large as 275 gpm. East of the fault zone the water may flow naturally from wells at low elevations, with reported flow as large as 170 gpm. The water from the
" Trinity sands" generally is of suitable quality for domestic and stock use, but in places it is highly mineralized.
The Glen Rose limestone generally yields only small quantities of water. In most places the water becomes more highly mineralized with depth, calcium and magnesium sulfate accounting for most of the increase. The reactor site rests primarily upon limestone several hundred
; . feet thick, as evidenced by test drillings and well logs in the surrounding a re a . These formations are essentially impervious, as shewn by the high pressure of the water found below 300 to 1000 feet, some wells flowing to the surface without pumps. The formations slope generally to the south, and littic or no useful ground water is found above a depth of 300 feet.
] l Numerous wells exist in the Austin area including locations on the Univer-1 sity campus. ) The Austin public water system, to which the University is connected, is supplied entirely with filtered river water and is distributed under pressure through a typical underground piping system. The water is con-tinuously tested and controlled under the jurisdiction of the City and i State IIealth Departments. Occasional checks are made of its radioactivity, i
-9 which runs about 6.3 x 10 pc/ml (gross 6).
Surface water run-off outside the Laboratory is directed into a University-owned storm sewer system. This portion of tlm system empties 2-19 4
,e , a. -- , ,.w - , , , - - , . , . .
Into Waller Creek about two blocks east of the Laboratory. The water of Waller Creek is monitored on a periodic basis. 2.6 SEIStf0 LOGY Seventeen earthquakes of intensity V or greater have centered in Texas since 1882. The earthquakes were characterized using the Modified Mercalli Scale of 1931. The scale has a range of I thru XII, on which an , intensity of I is not felt, an intensity of III is a vibration similar to that due to the passing of lightly loaded trucks, an intensity of VII is noticed by all as shaking of trees, waves on ponds, and quivering suspended objects but causes aegligibic damage to buildings of good design and con-struction, and an intensity of XII results in practically all works of construction being severely damaged or destroyed. The strongest earth-quake, a maximum intensity of VIII, was in western Texas in 1931 and was felt over 1,165,000 Km . Figure 2-11 shows the locations and inten-
, sities of all earthquakes in Texas since 1882 (Ref. 6) . Of these, none are known to have been felt or caused any damage in Austin. . l
- . 2-20 l
1 i l
Feb. 15, 1974
/
March 11, 1948 N - - J Ag geh - March 28, 1917 ' June 20, 1951 * "
- - .~,
z -
- - ._ _ k July 30, 1925 June 19,1936 July 20,1966
{ ""j"" ~ ~ ~ April'11, 1934
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/llav12,1969 March 19, 1957 -
gr (D- Aug. 14, 1966 ~N -
\~ Jan. 8, 1891 gq_e i
I N- l -- -- _l j._.g __ =-1 % ~~/ Y .- \-
- ~ '"
~~
- - ~~~
April 28,1964 April 9, 1932 _ Aug. 16, 1964 g y - Aug. 18, 1931 ' - - ~ - - Aug. 16, 1931 . ,,,,, ._ ,_ y N( } - -
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~~
~~" ~~ s _.
~lf- ,/
~~
~' _ ' 1914 (2) ~~
_ - /ae-}"""*
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"~
- ._l TEXAS EARTIIQUAKES Modified Mercalli _ _
Scale of 1931 e INTENSITY V
\
"(
O INTENSITY V-VI ~~ ] ~ - trus j camv amu me
@ INTENSITY VI / --
~~
@ INTENSITY VII*
O INTENSI'IT VIII
- Questionable Figure 2-11 2-21
Char *. er 2 References
- 1. "1976 Census of Population," Department of Commerce, Bureau of Census, City of Austin Planning Department.
- 2. " Local Climatological Data; Annual Summary with Comparative Data 1979," National Oceanic and Atmospheric Administration, Er.vironmental Data and Informatica Service, National Climatic Center Asheville, N.C.
- 3. "C11matography of Texas; Wind Rose-Austin Texas," National Weather Service, Austin, Texas.
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