Interlaboratory Comparison of UO2 Dissolution Rates PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Interlaboratory Comparison of UO2 Dissolution Rates PDF full book. Access full book title Interlaboratory Comparison of UO2 Dissolution Rates by . Download full books in PDF and EPUB format.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Author: D. W. Shoesmith
Publisher:
ISBN: 9780660165820
Category : Nuclear fuels
Languages : en
Pages : 0
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Radioactive waste disposal in the ground
Languages : en
Pages : 348
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 782
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Radioactive waste disposal
Languages : en
Pages : 726
Get Book Here
Book Description
Author: Armando L. Uriarte
Publisher:
ISBN:
Category : Inorganic acids
Languages : en
Pages : 90
Get Book Here
Book Description
Author: D. W. Shoesmith
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Get Book Here
Book Description
Author: Amanda J. Casella
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 166
Get Book Here
Book Description
As part of the performance assessments of proposed geologic repositories the effects of temperature, dissolved O2, and water and fuel chemistry on the dissolution rates of spent fuel are necessary to provide a quantitative estimate of the potential dose over geologic time frames. In this research, fuels containing Gd2O3-doped UO2 were tested in a single-pass flow-through setup. These tests have verified that in bicarbonate solutions as temperature increased the dissolution rate increased. However, the presence of silicate in the feedwater altered the system and lowered the dissolution rate at higher temperatures. Only the pure UO2 samples exhibited a dependence on the dissolved O2 concentration, which increased with rising temperature. The Gd2O3-dopant stabilized the fuel matrix and lowered the dissolution rate increasingly up to 4 wt%. The dissolution rates for pure UO2 compared reasonably well with the Yucca Mountain Model for tests performed at 50°C and 75°C, but were found to be approximately half the values predicted by the model at 25°C. After long time periods when the radiolytic field has diminished, additional benefits in dissolution reduction should exist due to constituents such as Gd2O3 in the fuel matrix and silicate in the groundwater. Thus, the durability of spent fuel in Yucca Mountain may be greater than previously modeled.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 12
Get Book Here
Book Description
Purpose of this work was to measure and model the intrinsic dissolution rates of U oxides under a variety of well-controlled conditions that are relevant to a geologic repository. When exposed to air at elevated temperature, spent fuel may form the stable phase U3O. Dehydrated schoepite, UO3·H2O, exists in drip tests on spent fuel. Equivalent sets of U3O and UO3·H2O dissolution experiments allowed a systematic examination of the effects of temperature (25-75 C), pH(8-10), and carbonate (2-200x10−4molar) concentrations at atmospheric oxygen conditions. Results indicate that UO3·H2O has a much higher dissolution rate (at least tenfold) than U3O under the same conditions. The intrinsic dissolution rate of unirradiated U3O8 is about twice that of UO2. Dissolution of both U3O8 and UO3·H2O shows a very high sensitivity to carbonate concentration. Present results show a 25 to 50-fold increase in room-temperature UO3·H2O dissolution rates between the highest and lowest carbonate concentrations. As with the UO2 dissolution data, the classical observed chemical kinetic rate law was used to model the U3O8 dissolution rate data. The pH did not have much effect on the models, in agreement with earlier analysis of the UO2 and spent fuel dissolution data. However, carbonate concentration, not temperature, had the strongest effect on the U3O8 dissolution rate. The U3O8 dissolution activation energy was about 6000 cal/mol, compared with 7300 and 8000 cal/mol for spent fuel and UO2, respectively.
