干旱区生态环境知识资源中心(Arid): Uncertainty analyses of infiltration and subsurface flow and transport for SDMP sites

Arid

DOI	10.2172/541818
报告编号	NUREG/CR--6565; PNNL--11705
来源ID	OSTI_ID: 541818
	Uncertainty analyses of infiltration and subsurface flow and transport for SDMP sites
	Meyer, P.D.; Rockhold, M.L.; Gee, G.W. [Pacific Northwest National Lab., Richland, WA (United States)]
英文摘要	US Nuclear Regulatory Commission staff have identified a number of sites requiring special attention in the decommissioning process because of elevated levels of radioactive contaminants. Traits common to many of these sites include limited data characterizing the subsurface, the presence of long-lived radionuclides necessitating a long-term analysis (1,000 years or more), and potential exposure through multiple pathways. As a consequence of these traits, the uncertainty in predicted exposures can be significant. In addition, simplifications to the physical system and the transport mechanisms are often necessary to reduce the computational requirements of the analysis. Several multiple-pathway transport codes exist for estimating dose, two of which were used in this study. These two codes have built-in Monte Carlo simulation capabilities that were used for the uncertainty analysis. Several tools for improving uncertainty analyses of exposure estimates through the groundwater pathway have been developed and are discussed in this report. Generic probability distributions for unsaturated and saturated zone soil hydraulic parameters are presented. A method is presented to combine the generic distributions with site-specific water retention data using a Bayesian analysis. The resulting updated soil hydraulic parameter distributions can be used to obtain an updated estimate of the probability distribution of dose. The method is illustrated using a hypothetical decommissioning site.
出版年	1997
报告类型	Technical Report
语种	英语
国家	美国
来源学科分类	54 ENVIRONMENTAL SCIENCES ; 05 NUCLEAR FUELS ; REMEDIAL ACTION ; HYDRAULIC CONDUCTIVITY ; SOILS ; RADIONUCLIDE MIGRATION ; INFORMATION NEEDS ; DATA COVARIANCES ; PROBABILISTIC ESTIMATION ; WATER INFLUX ; RADIATION DOSES ; SITE CHARACTERIZATION ; HYDROLOGY ; THEORETICAL DATA
URL	http://www.osti.gov/scitech/servlets/purl/541818
资源类型	科技报告
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/267265
推荐引用方式 GB/T 7714	Meyer, P.D.,Rockhold, M.L.,Gee, G.W. [Pacific Northwest National Lab., Richland, WA . Uncertainty analyses of infiltration and subsurface flow and transport for SDMP sites,1997.