Author: Dana J. IsherwoodPublisher:
ISBN:
Category :
Languages : en
Pages : 22
Book Description
I-129 Supplemental Information, Document Numbers 351-357
Author: Dana J. IsherwoodPreliminary Report on Retardation Factors and Radionuclide Migration
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Available data on distribution coefficients for the biologically important radionuclides present in high-level waste were used to estimate retardation factors (K/sub f/) for a mass transport hydrologic model. The radionuclides were divided into 3 groups: fission products with no sorption (K/sub f/ = 1), fission products with sorption (K/sub f/ = 102), and the actinides and their daughter products (K/sub f/ = 104). Minimum and maximum values were assigned the latter two groups. Uncertainties as a function of time were estimated at +- an order of magnitude. 39 references, 5 tables.
NUREG/CR.
Author: U.S. Nuclear Regulatory CommissionPublisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 156
Book Description
Energy Research Abstracts
Author: Earth Sciences Division, Collected Abstracts
Author: Lawrence Livermore Laboratory. Earth Sciences DivisionPublisher:
ISBN:
Category : Earth sciences
Languages : en
Pages : 150
Book Description
Radioactive Waste Processing and Disposal
Author: U.S. Nuclear Regulatory CommissionPublisher:
ISBN:
Category : Radioactive waste disposal
Languages : en
Pages : 948
Book Description
South Texas Project Units 1-2, Operation
Author: Radionuclide Migration/retardation
Author: Methods for Determining Radionuclide Retardation Factors
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
This report identifies a number of mechanisms that retard radionuclide migration, and describes the static and dynamic methods that are used to study such retardation phenomena. Both static and dynamic methods are needed for reliable safety assessments of underground nuclear-waste repositories. This report also evaluates the extent to which the two methods may be used to diagnose radionuclide migration through various types of geologic media, among them unconsolidated, crushed, intact, and fractured rocks. Adsorption is one mechanism that can control radionuclide concentrations in solution and therefore impede radionuclide migration. Other mechanisms that control a solution's radionuclide concentration and radionuclide migration are precipitation of hydroxides and oxides, oxidation-reduction reactions, and the formation of minerals that might include the radionuclide as a structural element. The retardation mechanisms mentioned above are controlled by such factors as surface area, cation exchange capacity, solution pH, chemical composition of the rock and of the solution, oxidation-reduction potential, and radionuclide concentration. Rocks and ground waters used in determining retardation factors should represent the expected equilibrium conditions in the geologic system under investigation. Static test methods can be used to rapidly screen the effects of the factors mentioned above. Dynamic (or column) testing, is needed to assess the effects of hydrodynamics and the interaction of hydrodynamics with the other important parameters. This paper proposes both a standard method for conducting batch Kd determinations, and a standard format for organizing and reporting data. Dynamic testing methods are not presently developed to the point that a standard methodology can be proposed. Normal procedures are outlined for column experimentation and the data that are needed to analyze a column experiment are identified.
Author: