Regulatory strategy

The regulatory strategy for the NNSS was negotiated in the 1990s as a tri­party Federal Facility Agreement and Consent Order (FFACO) between the DOE, the State of Nevada acting through the NDEP, and the US Depart­ment of Defense. The FFACO identifies corrective actions for historical sites of development, testing, and production of nuclear weapons and imple­ments four stages of actions:

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Radionuclide transport pathways off of the Nevada National Security Site

Regional groundwater flow in the eastern NNSS is southward through the carbonate aquifer beneath the basins and testing areas of Yucca and French­man Flats (Fig. 26.2). Groundwater flow directions change to the southwest in southern Frenchman Flat influenced by increased underflow from east of the NNSS, and following en echelon faults of the southwest trending, right slip Rock Valley fault […]

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Rainier Mesa/Shoshone Mountain CAU

A total of 68 underground detonations were conducted in tunnels con­structed in unsaturated zeolitized volcanic rocks of Rainier Mesa and Shos­hone Mountain (tunnel beds); all were located well above the regional groundwater table. Two detonations were in vertical shafts near the water table. The Rainier Mesa and Shoshone Mountain sites form plateau high­lands that demarcate the approximate eastern edge of […]

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Western Volcanic Highland

The geology of the western region of the NNSS consists primarily of thick sequences of ash-flow tuff, lava, and volcaniclastic rocks deposited during episodic volcanic cycles associated with the formation of as many as six coalesced caldera centers from 15 million to 9 million years ago (the South­west Nevada Volcanic Field; Byers et al., 1976; Sawyer et al., 1994). These […]

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Eastern carbonate aquifer

The eastern and southeastern region of the NNSS is characterized by groundwater flow predominantly within a regional carbonate aquifer (Fig. 26.2) that is part of an extremely thick, sedimentary sequence of Neo­proterozoic to mid-Paleozoic (Devonian) marine carbonate and clastic rocks deposited at the western edge of a stable continental margin of the North American craton (Sweetkind et al. , 2010). […]

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Hydrogeological setting of the Nevada National Security Site (NNSS)

The NNSS is located in the Great Basin portion of the basin-range physi­ographic province of the southwestern United States (Hunt, 1967; Stewart, 1980), approximately 150 km east of the Sierra Nevada mountain range containing the highest point in the contiguous United States (Mount Whitney, 4421 m) and about 40 km northeast of Death Valley, the lowest

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Nevada, USA

G. RUSKAUFF and B. CROWE, Navarro-Intera, LLC, USA and S. DRELLACK, National Security Technologies, LLC, USA DOI: 10.1533/9780857097446.3.801 Abstract: This chapter outlines the hydrogeological setting of the Nevada National Security Site (NNSS) and the expected pathways of groundwater flow and radionuclide transport. It describes the evolving strategy developed cooperatively between the National Nuclear Security Administration Nevada Site Office (NNSA/NSO) and […]

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