干旱区生态环境知识资源中心(Arid): A simulation of the transport and fate of radon-222 derived from thorium-230 low-level waste in the near-surface zone of the Radioactive Waste Management Site in Area 5 of the Nevada Test Site

Arid

DOI	10.2172/10135314
报告编号	DOE/NV/10630--58
来源ID	OSTI_ID: 10135314
	A simulation of the transport and fate of radon-222 derived from thorium-230 low-level waste in the near-surface zone of the Radioactive Waste Management Site in Area 5 of the Nevada Test Site
	Lindstrom, F.T.; Cawlfield, D.E.; Donahue, M.E.; Emer, D.F.; Shott, G.J.
英文摘要	US Department of Energy (DOE) Order 5820.2A (DOE, 1988) requires performance assessments on all new and existing low-level radioactive waste (LLW) disposal sites. An integral part of performance assessment is estimating the fluxes of radioactive gases such as radon-220 and radon-222. Data needs pointed out by mathematical models drive site characterization. They provide a logical means of performing the required flux estimations. Thorium-230 waste, consisting largely of thorium hydroxide and thorium oxides, has been approved for disposal in shallow trenches and pits at the LLW Radioactive Waste Management Site in Area 5 of the Nevada Test Site. A sophisticated gas transport model, CASCADR8 (Lindstrom et al., 1992b), was used to simulate the transport and fate of radon-222 from its source of origin, nine feet below a closure cap of native soil, through the dry alluvial earth, to its point of release into the atmosphere. CASCADR8 is an M-chain gas-phase radionuclide transport and fate model. It has been tailored to the site-specific needs of the dry desert environment of southern Nevada. It is based on the mass balance principle for each radionuclide and uses gas-phase diffusion as well as barometric pressure-induced advection as its main modes of transport. CASCADR8 uses both reversible and irreversible sorption kinetic rules as well as the usual classical Bateman (1910) M-chain decay rules for its kinetic processes. Worst case radon-222 gas-phase concentrations, as well as surface fluxes, were estimated over 40 days. The maximum flux was then used in an exposure assessment model to estimate the total annual dose equivalent received by a person residing in a standard 2500-square-foot house with 10-foot walls. Results are described.
出版年	1993
报告类型	Technical Report
语种	英语
国家	美国
来源学科分类	12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES ; 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS ; LOW-LEVEL RADIOACTIVE WASTES ; RADIOACTIVE WASTE DISPOSAL ; THORIUM 230 ; NEVADA TEST SITE ; RADIONUCLIDE MIGRATION ; MATHEMATICAL MODELS ; SOILS ; RADON 220 ; RADON 222 ; THORIUM HYDROXIDES ; THORIUM OXIDES ; RADIATION DOSES ; RADIATION HAZARDS ; SITE CHARACTERIZATION 052002 ; 053002 ; WASTE DISPOSAL AND STORAGE ; RADIOACTIVE EFFLUENTS
URL	http://www.osti.gov/scitech/servlets/purl/10135314
资源类型	科技报告
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/265418
推荐引用方式 GB/T 7714	Lindstrom, F.T.,Cawlfield, D.E.,Donahue, M.E.,et al. A simulation of the transport and fate of radon-222 derived from thorium-230 low-level waste in the near-surface zone of the Radioactive Waste Management Site in Area 5 of the Nevada Test Site,1993.