Transport of Radon Gas into a Tunnel at Yucca Mountain-Estimating Large-Scale Fractured Tuff Hydraulic Properties and Implications for the Operation of the Ventilation System [electronic resource]
Radon gas concentrations have been monitored as part of the operation of a tunnel (the Exploratory Studies Facility-ESF) at Yucca Mountain to ensure worker safety. The objective of this study was to examine the potential use of the radon data to estimate large-scale formation properties of fractured...
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Online Access |
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| Format: | Government Document Electronic eBook |
| Language: | English |
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Washington, D.C : Oak Ridge, Tenn. :
United States. Dept. of Energy ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy,
2003.
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| Subjects: |
MARC
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| 245 | 0 | 0 | |a Transport of Radon Gas into a Tunnel at Yucca Mountain-Estimating Large-Scale Fractured Tuff Hydraulic Properties and Implications for the Operation of the Ventilation System |h [electronic resource] |
| 260 | |a Washington, D.C : |b United States. Dept. of Energy ; |a Oak Ridge, Tenn. : |b distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, |c 2003. | ||
| 300 | |a 21 pages : |b digital, PDF file. | ||
| 336 | |a text |b txt |2 rdacontent. | ||
| 337 | |a computer |b c |2 rdamedia. | ||
| 338 | |a online resource |b cr |2 rdacarrier. | ||
| 500 | |a Published through the Information Bridge: DOE Scientific and Technical Information. | ||
| 500 | |a 06/06/2003. | ||
| 500 | |a "MOL.20030922.0006, DC36011" | ||
| 500 | |a FT. | ||
| 500 | |a G. Bodvarsson; S. Finsterle; A. Unger. | ||
| 520 | 3 | |a Radon gas concentrations have been monitored as part of the operation of a tunnel (the Exploratory Studies Facility-ESF) at Yucca Mountain to ensure worker safety. The objective of this study was to examine the potential use of the radon data to estimate large-scale formation properties of fractured tuffs. This objective was examined by developing a numerical model, based upon the characteristics of the ESF and the Topopah Spring welded (TSw) tuff unit, capable of predicting radon concentrations for prescribed ventilation conditions. The model was used to address two specific issues. First, it was used to estimate the permeability and porosity of the fractures in the TSw at the length scale of the ESF and extending tens of meters into the TSw, which surrounds the ESF. Second, the model was used to understand the mechanism leading to radon concentrations exceeding a specified level within the ESF. The mechanism controlling radon concentrations in the ESF is a function of atmospheric barometric fluctuations being propagated down the ESF along with ventilated air flow and the slight suction induced by the ventilation exhaust fans at the South Portal of the ESF. These pressure fluctuations are dampened in the TSw fracture continuum according to its permeability and porosity. Consequently, as the barometric pressure in the ESF drops rapidly, formation gases from the TSw are pulled into the ESF, resulting in an increase in radon concentrations. Model calibration to both radon concentrations measured in the ESF and gas-phase pressure fluctuations in the TSw yielded concurrent estimates of TSw fracture permeability and porosity of l x 10⁻¹¹ m² and 0.00034, respectively. The calibrated model was then used as a design tool to predict the effect of adjusting the current ventilation-system operation strategy for reducing the probability of radon gas concentrations exceeding a specified level. | |
| 650 | 7 | |a Safety. |2 local. | |
| 650 | 7 | |a Gases. |2 local. | |
| 650 | 7 | |a Hydraulics. |2 local. | |
| 650 | 7 | |a Porosity. |2 local. | |
| 650 | 7 | |a Tuff. |2 local. | |
| 650 | 7 | |a Calibration. |2 local. | |
| 650 | 7 | |a Air Flow. |2 local. | |
| 650 | 7 | |a Blowers. |2 local. | |
| 650 | 7 | |a Fluctuations. |2 local. | |
| 650 | 7 | |a Transport. |2 local. | |
| 650 | 7 | |a Ventilation. |2 local. | |
| 650 | 7 | |a Probability. |2 local. | |
| 650 | 7 | |a Permeability. |2 local. | |
| 650 | 7 | |a Fractures. |2 local. | |
| 650 | 7 | |a Ventilation Systems. |2 local. | |
| 650 | 7 | |a Radon. |2 local. | |
| 650 | 7 | |a Yucca Mountain. |2 local. | |
| 650 | 7 | |a Management Of Radioactive Wastes, And Non-radioactive Wastes From Nuclear Facilities. |2 edbsc. | |
| 710 | 1 | |a United States. |b Department of Energy. |b Yucca Mountain Project Office. |4 res. | |
| 710 | 1 | |a United States. |b Department of Energy. |4 spn. | |
| 710 | 1 | |a United States. |b Department of Energy. |b Office of Scientific and Technical Information. |4 dst. | |
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