The Experts below are selected from a list of 58872 Experts worldwide ranked by ideXlab platform
J-M Montel - One of the best experts on this subject based on the ideXlab platform.
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Phosphates and nuclear Waste Storage
Elements, 2008Co-Authors: J-M MontelAbstract:A significant effort has been made by the scientific community to evaluate the potential of phosphate minerals and glasses as nuclear Waste Storage hosts. Radioactive Waste-bearing phosphates, including monazites, apatites, and glasses, can be readily synthesized in the laboratory. Because of their low solubilities and slow dissolution rates, these phosphates are more resistant to corrosion by geological fluids than many other potential nuclear Waste Storage hosts, including borosilicate glass. Phosphates are, however, not currently being used for nuclear Waste Storage, in part because their synthesis at the industrial scale is relatively labor intensive, often requiring the separation of the Waste into distinct fractions of elements. Such limitations may be overcome by adding phosphate amendments to backfill material, which could provoke the precipitation of stable radiactive Waste-bearing phosphate minerals in situ.
Andreas Leed - One of the best experts on this subject based on the ideXlab platform.
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quantitative cost and schedule risk analysis of nuclear Waste Storage
arXiv: General Finance, 2019Co-Authors: Alexander Budzier, Bent Flyvbjerg, Andi Garavaglia, Andreas LeedAbstract:This study provides an independent, outside-in estimate of the cost and schedule risks of nuclear Waste Storage projects. Based on a reference class of 216 past, comparable projects, risk of cost overrun was found to be 202% or less, with 80% certainty, i.e., 20% risk of an overrun above 202%. Based on a reference class of 200 past, comparable projects, risk of schedule overrun was found to be 104% or less, with 80% certainty, i.e., 20% risk of overrun above 104%. Cost risk and schedule risk are both substantial for nuclear Waste Storage projects.
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quantitative cost and schedule risk analysis of nuclear Waste Storage
Social Science Research Network, 2018Co-Authors: Alexander Budzier, Bent Flyvbjerg, Andi Garavaglia, Andreas LeedAbstract:This study provides an independent, outside-in estimate of the cost and schedule risks of nuclear Waste Storage projects. Nuclear Waste Storage is here defined as special facilities for the wet and dry Storage and disposal of high-level (HILW) and low and intermediate-level nuclear Waste (LILW). The study analyzed cost and schedule risk profiles of past, completed nuclear Waste Storage (n = 22), nuclear new builds (n = 194) and underground mining projects (n = 31).
G V Lavrentyeva - One of the best experts on this subject based on the ideXlab platform.
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risk assessment for human health and terrestrial ecosystem under chronic radioactive pollution near regional radioactive Waste Storage
Journal of Physics: Conference Series, 2017Co-Authors: G V Lavrentyeva, M N Katkova, R R Shoshina, B I SynzynysAbstract:An impact of the radioactive Waste Storage facility at the regional population was assessed under supervision of IAEA. It was made in accordance with the methodology for assessment of doses and risks to human Storage using different scenarios of radionuclides releases into the environment. The following scenarios were considered: leakage of fluid, resuspension of dust, fire, flooding. Thy evaluation of radiation doses received and the risks to the human showed that the risk has been acceptable for all scenarios. An approach for an ecological risk assessment for terrestrial ecosystem is presented as five modules: selection of the ecosystem-receptor of radiation effects; determination of reference species of living organisms and their survival indices; the critical load as an absorbed dose rate is calculated from the dependence between the absorbed Sr-90 radiation dose rate and the coefficient of radioactive strontium accumulation in mollusc shells; the critical dose; risk is assessed from a part of the ecosystem territory with increased mollusc loading; uncertainties appeared at each stage of risk assessment are characterized. The risk of exposure to the repository on the ecosystem should be characterized as unacceptable.
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characteristic of pollution with groundwater inflow 90sr natural waters and terrestrial ecosystems near a radioactive Waste Storage
Journal of Environmental Radioactivity, 2014Co-Authors: G V LavrentyevaAbstract:Abstract The studies were conducted in the territory contaminated by 90Sr with groundwater inflow as a result of leakage from the near-surface trench-type radioactive Waste Storage. The vertical soil 90Sr distribution up to the depth of 2–3 m is analyzed. The area of radioactive contamination to be calculated with a value which exceeds the minimum significant activity 1 kBq/kg for the tested soil layers: the contaminated area for the 0–5 cm soil layer amounted to 1800 ± 85 m2, for the 5–10 cm soil layer amounted to 300 ± 12 m2, for the 10–15 cm soil layer amounted to 180 ± 10 m2. It is found that 90Sr accumulation proceeds in a natural sorption geochemical barrier of the marshy terrace near flood plain. The exposure doses for terrestrial mollusks Bradybaena fruticum are presented. The excess 90Sr interference level was registered both in the ground and surface water during winter and summer low-water periods and autumn heavy rains.
Alexander Budzier - One of the best experts on this subject based on the ideXlab platform.
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quantitative cost and schedule risk analysis of nuclear Waste Storage
arXiv: General Finance, 2019Co-Authors: Alexander Budzier, Bent Flyvbjerg, Andi Garavaglia, Andreas LeedAbstract:This study provides an independent, outside-in estimate of the cost and schedule risks of nuclear Waste Storage projects. Based on a reference class of 216 past, comparable projects, risk of cost overrun was found to be 202% or less, with 80% certainty, i.e., 20% risk of an overrun above 202%. Based on a reference class of 200 past, comparable projects, risk of schedule overrun was found to be 104% or less, with 80% certainty, i.e., 20% risk of overrun above 104%. Cost risk and schedule risk are both substantial for nuclear Waste Storage projects.
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quantitative cost and schedule risk analysis of nuclear Waste Storage
Social Science Research Network, 2018Co-Authors: Alexander Budzier, Bent Flyvbjerg, Andi Garavaglia, Andreas LeedAbstract:This study provides an independent, outside-in estimate of the cost and schedule risks of nuclear Waste Storage projects. Nuclear Waste Storage is here defined as special facilities for the wet and dry Storage and disposal of high-level (HILW) and low and intermediate-level nuclear Waste (LILW). The study analyzed cost and schedule risk profiles of past, completed nuclear Waste Storage (n = 22), nuclear new builds (n = 194) and underground mining projects (n = 31).
G Saracino - One of the best experts on this subject based on the ideXlab platform.
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assessing the feasibility of interrogating nuclear Waste Storage silos using cosmic ray muons
Journal of Instrumentation, 2015Co-Authors: F Ambrosino, L Bonechi, L Cimmino, R Dalessandro, D G Ireland, R Kaiser, D Mahon, N Mori, P Noli, G SaracinoAbstract:Muon radiography is a fast growing field in applied scientific research. In recent years, many detector technologies and imaging techniques using the Coulomb scattering and absorption properties of cosmic-ray muons have been developed for the non-destructive assay of various structures across a wide range of applications. This work presents the first results that assess the feasibility of using muon radiography to interrogate Waste silos within the U.K. Nuclear Industry. Two such approaches, using different techniques that exploit each of these properties, have previously been published, and show promising results from both simulation and experimental data for the detection of shielded high-Z materials and density variations from volcanic assay. Both detection systems used are based on scintillator and photomultiplier technologies. Results from dedicated simulation studies using both these proven technologies and image reconstruction techniques are presented for an intermediate-sized legacy nuclear Waste Storage facility filled with concrete and an array of uranium samples. Both results highlight the potential to identify uranium objects of varying thicknesses greater than 5 cm within real-time durations of several weeks. Increased contributions from Coulomb scattering within the concrete matrix of the structure hinder the ability of both approaches to resolve similar objects of 2 cm dimensions even with increased statistics. These results are all dependent on both the position of the objects within the facility and the locations of the detectors. Results for differing thicknesses of concrete, which reflect the non-standard composition of these complex, legacy structures under interrogation, are also presented alongside studies performed for a series of data collection durations. It is anticipated that with further research and optimisation of detector technologies and geometries, muon radiography in one, or both of these forms, will play a key role in future industrial applications within the U.K. Nuclear Industry.
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assessing the feasibility of interrogating nuclear Waste Storage silos using cosmic ray muons
arXiv: Instrumentation and Detectors, 2014Co-Authors: F Ambrosino, L Bonechi, L Cimmino, R Dalessandro, D G Ireland, R Kaiser, D Mahon, N Mori, P Noli, G SaracinoAbstract:Muon radiography is a fast growing field in applied scientific research. In recent years, many detector technologies and imaging techniques using the Coulomb scattering and absorption properties of cosmic-ray muons have been developed for the non-destructive assay of various structures across a wide range of applications. This work presents the first results that assess the feasibility of using muons to interrogate Waste silos within the UK Nuclear Industry. Two such approaches, using different techniques that exploit each of these properties, have previously been published, and show promising results from both simulation and experimental data for the detection of shielded high-Z materials and density variations from volcanic assay. Both detector systems are based on scintillator and photomultiplier technologies. Results from dedicated simulation studies using both these technologies and image reconstruction techniques are presented for an intermediate-sized nuclear Waste Storage facility filled with concrete and an array of uranium samples. Both results highlight the potential to identify uranium objects of varying thicknesses greater than 5cm within real-time durations of several weeks. Increased contributions from Coulomb scattering within the concrete of the structure hinder the ability of both approaches to resolve objects of 2cm dimensions even with increased statistics. These results are all dependent on both the position of the objects within the facility and the locations of the detectors. Results for differing thicknesses of concrete, which reflect the unknown composition of the structures under interrogation, are also presented alongside studies performed for a series of data collection durations. It is anticipated that with further research, muon radiography in one, or both of these forms, will play a key role in future industrial applications within the UK Nuclear Industry.
