ML20116N798
| ML20116N798 | |
| Person / Time | |
|---|---|
| Site: | University of Texas at Austin |
| Issue date: | 04/30/1985 |
| From: | TEXAS, UNIV. OF, AUSTIN, TX |
| To: | |
| Shared Package | |
| ML20116N790 | List: |
| References | |
| NUDOCS 8505070355 | |
| Download: ML20116N798 (9) | |
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Amended site Location The University of Texas at Austin TRIGA Research Reactor Docket f50-602 April 30, 1985 4
8505070355 850503 PDR ADOCK 05000602 A
iN P2 The amended site location for The University of Texas at Austin TRIGA reactor facility and the Nuclear Engin-eering Teaching Laboratory is located in the northeast region,of the Balcones Research Center east tract (Figure 1 and 2).
Situated approximately 240 feet from the northeast boundary of the research center site (Figure 3 and 4), the facility is oriented with the front entrance toward the site boundary and the rear; entrance toward the site interior.
Access to the general area of the research center east tract is provided by state Highway 1325 (Burnet Rend) onLthe southeast, Braker Lane to the northeast and Longhorn Boulevard to the southwest.
The northwest side of the research center east tract is bounded by the Missouri Pacific Railroad.
Access within the research center to the northeast site area and the proposed facility is provided by way of a loop and a spur from the major northeast site entrance.
l Areas of the Balcones Research Center and its related activities are situated to the south, southwest, west and northwest of the proposed facility.
A large industrial complex'(data processing products manufacturing facility) is located to the north of the site area.
Areas beyond the research center boundary to the northeast, east, and south-east include several small business activities (retail stores, offices, warehouses) of various types.. Distances from the proposed facility location to-other adjacent ac-tivities on the research center site are 235 feet and 780 feet to the Bureau of Economic Geology facilities located to the northwest, about 525 feet to the Water Resources facilities located to the southwest, about 1000 feet to l
the Center for Electromechanics and Center for Energy _
Studies located to the' west, and approximately 250 feet to an. Ecology Garden located to the south.
Offsite-commercial activities in the immediate area include a large computer manufacturer facility located to the north at a distance of st least 625 feet, several small business operations to the northeast.and southeast at a distance of at least 500 feet and a couple of commercial activities located between 275 i
and 375 feet to the east of the' proposed facility location.
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are an elevation of j
Specific site characteristics 790 feet with a variation of less than 2 feet in the immediate vicinity of the building location and expected 2 below the removed soil load conditions of 40,000 lbs/ft top soil to support building structures.
Beneath the reactor tank and shield structure a concrete thickness of i
at least 2 feet is planned for separation and support of the tank and shield structure from the local site conditions.
The level of the first floor of the building is_ planned for an' elevation 7 feet below the mean grade level'of the general site area.
Specific features of the local site conditions and building plan layout are related to two important design considerations for the control of facility' effluents.
First is the' drainage of water from j
-the site to prevent flooding of the below grade, lower floor level, and second is the release of exhaust air from the' site to provide dilution of gaseous releases above the upper roof level.
Water drainage of the immediate site to prevent flooding is primarily related to the potential-but temp-orary occurrence of extreme rainfall rates.
Surface water 3
l runoff from the research center site is drained into the l
Shoal Creek watershed except'for the extreme' northeast region of the site which drains into the Walnut Creek i
vetershed.
The propo' sed fecility is located in the northeast site region with drainage into the Walnut Creek watershed but near the dividing line to the Shoal Creek watershed.
Situated at an elevation about seven' feet below I
the maximum between the two watersheds, but well above the local area flood planes, and. located nearly equidistant, one half-mile, from drainage easements of both watersheds, no significant general site area flooding is anticipated.
Facility design includes provisions and~ features for removal'of water runoff from roof and surrounding areas.
Water drainage f rom. the site: is also provided f rom the drive. access area to avoid localised flooding of.the lower level. 'The drainage provisions and small area for water ac-cumulation compared to'the large' area of the first floor level combine to limit the potential for.any flooding of the first level.
Minor flooding of the first-level, although not anticipated, does not represent a safety
-hasard to Ahe reactor' operation.
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Discharge of exhaust air from the_ facility is planned from a stack with air ejected from a point above the roof line of the building.
Dispersion of argon-41 contained in the exhaust will depend on. ventilation dilution, exhaust velocity, release height and assumed building cross section as well as distance from the release point.
At the pro-i posed facility location, the nearest occupied buildings are i
located roughly north and east of the facility.
Both ex-pected. wind velocities and directional frequencies are at minimums in the-north and east directions.
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Safety analysis of gaseous effluent releases apply a dilution factor that assumes a building cross section of 2520 ft2 for the reactor bay area of the structure.-
If the entire building structure is included, the minimum cross section is 4892 ft2 in the northwest and southeast direc-2 in the northeast and' southwest direc-tions, and 6446 ft tions.
Although air exhaust releases will be at effective heights greater than the adjacent buildings, air mixing in the lee of the building should be sided by wind velocity profiles.
In the direction to the nearest buildings, east and west, mixing will be sided by light and variable winds, while the prevailing winds from either the north or south in_the direction of more distant buildings.
are Conservatism of the dilution factor in the building wake and estimates of peak concentrations released indicate that argon-41 releases do not endanger the public health or safety.
Actual annual releases from similiar facilities l'
support the conclusion that measured releases are sub-stantially less than estimated releases.- An average annual release concentration of 2 x 10 6 p C /cm3 for The University of Texas at Austin proposed facilty-provides an additional
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limit to the' actual release of' argon-41 gas' concentrations.
Environmental impact at the facility site.will con-sist.of those activities expected for construction of a typical building of 19500 square feet.
Some site prepar-ation work such as general clearing and leveling resulted l
from operations of a magnesium plant at the site in the 1940's. Additional site preparation and'other~ activities l
of_ construction will represent a small impact relative to the.nearly 555,000 gross square feet of construction being completed in the first phase of a major development. program for_the Balcones Research Center.
The first phase of con-struction includes some research center site utilities, several service related utilities and service roads.
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PS At the location of the planned site an excavation of approx-instely 2200 cubic yards is projected, most of which will be reused in development of the final site and building plan layout.
No measurable significant impact either temporary or permanent is anticipated beyond the immediate construction ares..
Other construction. projects in the area such as completion of Braker Lane and extension of Loop 1
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near;the research center will have substantially larger temporary 'and permanent impacts to the ares..
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