Modeling of Groundwater Flow and Radionuclide Transport at the Climax Mine sub-CAU, Nevada Test Site

Pohlmann, K.; Ye, M.; Reeves, Donald M.; Zavarin, Mavrik; Decker, Danielle; Chapman, Jenny

doi:10.2172/922626

Cited by 14 publications

(29 citation statements)

References 112 publications

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“…Additional comparison of the models can be found in Rehfeldt (2004) and Pohlmann et al (2007). Description of the geologic, hydrologic and hydrogeologic conditions of the DVRFS is beyond the scope of this paper, and the reader is referred to D'Agnese et al (1997) and Belcher (2004) for further information on these topics.…”

Section: Description Of the Five Alternative Recharge Modelsmentioning

confidence: 99%

“…Because conceptual model uncertainty can be significant, ignoring it (focusing only on parametric uncertainty) may result in biased predictions and underestimation of uncertainty. While expert elicitation was used for evaluating uncertainty of recharge and geological models (Pohlmann et al, 2007), this paper focuses on the recharge models applied throughout the DVRFS. In the past few decades, several recharge models have been independently developed for Nevada by different researchers based on different scientific theories.…”

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confidence: 99%

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Expert elicitation of recharge model probabilities for the Death Valley regional flow system

Pohlmann

Chapman

2008

Journal of Hydrology

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Section: Description Of the Five Alternative Recharge Modelsmentioning

confidence: 99%

mentioning

confidence: 99%

Expert elicitation of recharge model probabilities for the Death Valley regional flow system

Pohlmann

Chapman

2008

Journal of Hydrology

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“…The construction of this model, which includes all of Yucca Flat as well as Climax stock, is documented in Bechtel Nevada (2006), and an electronic version of the model has been made available to various entities that are tasked with modeling data from the SPE. In addition, the Desert Research Institute developed a hydrogeologic flow model for the Climax stock in support of the UGTA Sub-Project (Pohlmann et al, 2007) that includes an appendix in which are compiled all fracture data available for the underground workings at the stock. …”

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confidence: 99%

Geology of the Source Physics Experiment Site, Climax Stock, Nevada National Security Site

Prothro¹

2012

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A test bed for a series of chemical explosives tests known as Source Physics Experiments (SPE) was constructed in granitic rock of the Climax stock, in northern Yucca Flat at the Nevada National Security Site in 2010-2011. These tests are sponsored by the U.S. Department of Energy, National Nuclear Security Administration's National Center for Nuclear Security. The test series is designed to study the generation and propagation of seismic waves, and will provide data that will improve the predictive capability of calculational models for detecting and characterizing underground explosions. Abundant geologic data are available for the area, primarily as a result of studies performed in conjunction with the three underground nuclear tests conducted in the Climax granite in the 1960s and a few later studies of various types.The SPE test bed was constructed at an elevation of approximately 1,524 meters (m), and consists of a 91.4-centimeter (cm) diameter source hole at its center, surrounded by two rings of three 20.3-cm diameter instrument holes. The inner ring of holes is positioned 10 m away from the source hole, and the outer ring of holes is positioned 20 m from the source hole. An initial 160-m deep core hole was drilled at the location of the source hole that provided information on the geology of the site and rock samples for later laboratory testing. A suite of geophysical logs was run in the core hole and all six instruments holes to obtain matrix and fracture properties.Detailed information on the character and density of fractures encountered was obtained from the borehole image logs run in the holes. A total of 2,488 fractures were identified in the seven boreholes, and these were ranked into six categories (0 through 5) on the basis of their degree of openness and continuity. The analysis presented here considered only the higher-ranked fractures (ranks 2 through 5), of which there were 1,215 (approximately 49 percent of all fractures identified from borehole image logs). The fractures were grouped into sets based on their orientation. The most ubiquitous fracture set (50 percent of all higher-ranked fractures) is a group of low-angle fractures (dips 0 to 30 degrees). Fractures with dips of 60 to 90 degrees account for 38 percent of high-ranked fractures, and the remaining 12 percent are fractures with moderate dips (30 to 60 degrees). The higher-angle fractures are further subdivided into three sets based on their dip direction: fractures of Set 1 dip to the north-northeast, fractures of Set 2 dip to the south-southwest, and Set 3 consists of high-angle fractures that dip to the southeast and strike northeast. The low-angle fractures (Set 4) dip eastward. Fracture frequency does not appear to change substantially with depth. True fracture spacing averages 0.9 to 1.2 m for high-angle Sets 1, 2, and 3, and 0.6 m for Set 4. Two significant faults were observed in the core, centered at the depths of 25.3 and 32.3 m. The upper of these two faults dips 80 degrees to the north-northeast and, thus, is...

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“…• Climax Mine sub-CAU scale modeling (Pohlmann et al, 2007). Evaluates the Climax Mine groundwater flow and radionuclide transport and provides boundary conditions for the Yucca Flat CAU scale modeling.…”

Section: Review Of Available Source Term Informationmentioning

confidence: 99%

“…These analytical solutions may be used to quickly estimate time temperature histories of the melt glass similar to that presented in Pohlmann et al (2007). Alternately, numerical modeling can be used if the complexities of the problem prohibit the implications inherent in analytical solutions.…”

Section: -29mentioning

confidence: 99%

Unclassified Sources Term and Radionuclide Data for Corrective Action Unit 97: Yucca Flat/Climax Mine, Nevada Test Site, Nevada, Revision 2

Martian¹

2009

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Modeling of Groundwater Flow and Radionuclide Transport at the Climax Mine sub-CAU, Nevada Test Site

Cited by 14 publications

References 112 publications

Expert elicitation of recharge model probabilities for the Death Valley regional flow system

Expert elicitation of recharge model probabilities for the Death Valley regional flow system

Geology of the Source Physics Experiment Site, Climax Stock, Nevada National Security Site

Unclassified Sources Term and Radionuclide Data for Corrective Action Unit 97: Yucca Flat/Climax Mine, Nevada Test Site, Nevada, Revision 2

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