干旱区生态环境知识资源中心(Arid): BLT-EC (Breach, Leach Transport, and Equilibrium Chemistry), a finite-element model for assessing the release of radionuclides from low-level waste disposal units: Background, theory, and model description

Arid

DOI	10.2172/108216
报告编号	NUREG/CR--6305; BNL-NUREG--52446
来源ID	OSTI_ID: 108216
	BLT-EC (Breach, Leach Transport, and Equilibrium Chemistry), a finite-element model for assessing the release of radionuclides from low-level waste disposal units: Background, theory, and model description
	MacKinnon, R.J.; Sullivan, T.M. [Brookhaven National Lab., Upton, NY (United States)]; Simonson, S.A. [Massachusetts Inst. of Technology, Cambridge, MA (United States)]; Suen, C.J. [California State Univ., Fresno, CA (United States)]
英文摘要	Performance assessment models typically account for the processes of sorption and dissolution-precipitation by using an empirical distribution coefficient, commonly referred to as K{sub d} that combines the effects of all chemical reactions between solid and aqueous phases. In recent years, however, there has been an increasing awareness that performance assessments based solely on empirically based K{sub d} models may be incomplete, particularly for applications involving radionuclides having sorption and solubility properties that are sensitive to variations in the in-situ chemical environment. To accommodate variations in the in-situ chemical environment, and to assess its impact on radionuclide mobility, it is necessary to model radionuclide release, transport, and chemical processes in a coupled fashion. This modeling has been done and incorporated into the two-dimensional, finite-element, computer code BLT-EC (Breach, Leach, Transport, Equilibrium Chemistry). BLT-EC is capable of predicting container degradation, waste-form leaching, and advective-dispersive, multispecies, solute transport. BLT-EC accounts for retardation directly by modeling the chemical processes of complexation, sorption, dissolution-precipitation, ion-exchange, and oxidation-reduction reactions. In this report we: (1) present a detailed description of the various physical and chemical processes that control the release and migration of radionuclides from shallow land LLW disposal facilities; (2) formulate the mathematical models that represent these processes; (3) outline how these models are incorporated and implemented in BLT-EC; and (4) demonstrate the application of BLT-EC on a set of example problems.
出版年	1995
报告类型	Technical Report
语种	英语
国家	美国
来源学科分类	05 NUCLEAR FUELS ; 54 ENVIRONMENTAL SCIENCES ; 99 MATHEMATICS, COMPUTERS, INFORMATION SCIENCE, MANAGEMENT, LAW, MISCELLANEOUS ; LOW-LEVEL RADIOACTIVE WASTES ; GROUND DISPOSAL ; RADIOACTIVE WASTE DISPOSAL ; RADIONUCLIDE MIGRATION ; SOURCE TERMS ; B CODES
URL	http://www.osti.gov/scitech/servlets/purl/108216
资源类型	科技报告
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/266250
推荐引用方式 GB/T 7714	MacKinnon, R.J.,Sullivan, T.M. [Brookhaven National Lab., Upton, NY ,Simonson, S.A. [Massachusetts Inst. of Technology, Cambridge, MA ,et al. BLT-EC (Breach, Leach Transport, and Equilibrium Chemistry), a finite-element model for assessing the release of radionuclides from low-level waste disposal units: Background, theory, and model description,1995.