scholarly journals Salton Sea Geothermal Field, California, as a near-field natural analog of a radioactive waste repository in salt

1983 ◽  
Author(s):  
W.A. Elders ◽  
L.H. Cohen
Keyword(s):  
Radioactive Waste ◽  
Near Field ◽  
Geothermal Field ◽  
Salton Sea ◽  
Radioactive Waste Repository ◽  
Natural Analog ◽  
Waste Repository

scholarly journals Multibarrier system preventing migration of radionuclides from radioactive waste repository

Nukleonika ◽  
2015 ◽  
Vol 60 (3) ◽  
pp. 557-563 ◽  
Author(s):  
Wioleta Olszewska ◽  
Agnieszka Miśkiewicz ◽  
Grażyna Zakrzewska-Kołtuniewicz ◽  
Leszek Lankof ◽  
Leszek Pająk
Keyword(s):  
Radioactive Waste ◽  
Near Field ◽  
Storage Site ◽  
Radionuclide Migration ◽  
Radioactive Waste Repository ◽  
Geological Barrier ◽  
Radioactive Waste Repositories ◽  
Waste Repository ◽  
Waste Repositories ◽  
Migration Modeling

Abstract Safety of radioactive waste repositories operation is associated with a multibarrier system designed and constructed to isolate and contain the waste from the biosphere. Each of radioactive waste repositories is equipped with system of barriers, which reduces the possibility of release of radionuclides from the storage site. Safety systems may differ from each other depending on the type of repository. They consist of the natural geological barrier provided by host rocks of the repository and its surroundings, and an engineered barrier system (EBS). The EBS may itself comprise a variety of sub-systems or components, such as waste forms, canisters, buffers, backfills, seals and plugs. The EBS plays a major role in providing the required disposal system performance. It is assumed that the metal canisters and system of barriers adequately isolate waste from the biosphere. The evaluation of the multibarrier system is carried out after detailed tests to determine its parameters, and after analysis including mathematical modeling of migration of contaminants. To provide an assurance of safety of radioactive waste repository multibarrier system, detailed long term safety assessments are developed. Usually they comprise modeling of EBS stability, corrosion rate and radionuclide migration in near field in geosphere and biosphere. The principal goal of radionuclide migration modeling is assessment of the radionuclides release paths and rate from the repository, radionuclides concentration in geosphere in time and human exposure to ionizing radiation

The biogeochemical behaviour of U(VI) in the simulated near-field of a low-level radioactive waste repository

2006 ◽  
Vol 21 (9) ◽  
pp. 1539-1550 ◽  
Author(s):  
James R. Fox ◽  
Robert J.G. Mortimer ◽  
Gavin Lear ◽  
Jonathan R. Lloyd ◽  
Ian Beadle ◽  
...  
Keyword(s):  
Radioactive Waste ◽  
Near Field ◽  
Radioactive Waste Repository ◽  
Low Level ◽  
Waste Repository ◽  
Low Level Radioactive Waste

Use of Natural Analog and Modeling Studies to Constrain the Effects of Magmatic Activity on Long-Term Geologic Repositories

1994 ◽  
Vol 353 ◽  
Author(s):  
Greg A. Valentine ◽  
N. D. Rosenberg ◽  
B. M. Crowe ◽  
F. V. Perry
Keyword(s):  
Radioactive Waste ◽  
Volcanic Eruption ◽  
Thermal Loading ◽  
Yucca Mountain ◽  
Temporal Scale ◽  
Magmatic Activity ◽  
Radioactive Waste Repository ◽  
Natural Analog ◽  
Waste Repository

AbstractExamples of the application of natural-analog studies to the estimation of the consequences of a volcanic eruption penetrating a radioactive waste repository are given, including the criteria for analog selection and new data from ongoing studies. Examples of early modeling results focusing on the spatial and temporal scale of subsurface processes are also provided. All of these examples are taken from studies of the potential Yucca Mountain repository, Nevada, but similar approaches could be applied in other areas. In addition, studies of subsurface processes initiated by magmatic events serve as useful analogs for repository thermal loading studies.

The Salton Sea Geothermal Field as a Natural Analog for the Near-Field in a Salt High-Level Nuclear Waste Repository

1984 ◽  
Vol 44 ◽  
Author(s):  
Wilfred A. Elders ◽  
Judith B. Moody
Keyword(s):  
Nuclear Waste ◽  
Near Field ◽  
Geothermal Field ◽  
Salton Sea ◽  
High Level Waste ◽  
Nuclear Waste Repository ◽  
Natural Analog ◽  
Naturally Occurring ◽  
Wide Range ◽  
High Level

AbstractThe Salton Sea Geothermal Field (SSGF), on the delta of the Colorado River in southern California, is being studied as a natural analog for the near-field environment of proposed nuclear waste repositories in salt. A combination of mineralogical and geochemical methods is being employed to develop a three dimensional picture of temperature, salinity, lithology, mineralogy, and chemistry of reactions between the reservoir rocks and the hot brines. Our aim is to obtain quantitative data on mineral stabilities and on mobilities of the naturally occurring radionuclides of concern in Commercial High-Level Waste (CHLW). These data will be used to validate the EQ3/6 geochemical code under development to model the salt near-field repository behavior.Maximum temperatures encountered in wells in the SSGF equal or exceed peak temperatures expected in a salt repository. Brines produced from these wells have major element chemistry similar to brines from candidate salt sites. Relative to the rocks, these brines are enriched in Na, Mn, Zn, Sr, Ra and Po, depleted in Ba, Si, Mg, Ti, and Al, and strongly depleted in U and Th. However the unaltered rocks contain only about 2–3 ppm of U and 4–12 ppm of Th, largely in detrital epidotes and zircons. Samples of hydrothermally altered rocks from a wide range of temperature and salinity show rather similar uniform low concentrations of these elements, even when authigenic illite, chlorite, epidote and feldspar are present. These observations suggest that U and Th are relatively immobile in these hot brines. However Ra, Po, Cs and Sr are relatively mobile. Work is continuing to document naturally occurring radionuclide partitioning between SSGF minerals and brine over a range of temperature, salinity, and lithology.

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