DISSOLVED CONCENTRATION LIMITS OF RADIOACTIVE ELEMENTS
The purpose of this study is to evaluate dissolved concentration limits (also referred to as solubility limits) of elements with radioactive isotopes under probable repository conditions, based on geochemical modeling calculations using geochemical modeling tools, thermodynamic databases, field measurements, and laboratory experiments. The scope of this modeling activity is to predict dissolved concentrations or solubility limits for 14 elements with radioactive isotopes (actinium, americium, carbon, cesium, iodine, lead, neptunium, plutonium, protactinium, radium, strontium, technetium, thorium, and uranium) important to calculated dose. Model outputs for uranium, plutonium, neptunium, thorium, americium, and protactinium are in the form of tabulated functions with pH and log (line integral) CO{sub 2} as independent variables, plus one or more uncertainty terms. The solubility limits for the remaining elements are either in the form of distributions or single values. The output data from this report are fundamental inputs for Total System Performance Assessment for the License Application (TSPA-LA) to determine the estimated release of these elements from waste packages and the engineered barrier system. Consistent modeling approaches and environmental conditions were used to develop solubility models for all of the actinides. These models cover broad ranges of environmental conditions so that they are applicable to both waste packages and the invert. Uncertainties from thermodynamic data, water chemistry, temperature variation, and activity coefficients have been quantified or otherwise addressed.
- Research Organization:
- Office of Scientific and Technical Information (OSTI), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- NA
- OSTI ID:
- 859259
- Report Number(s):
- ANL-WIS-MD-000010 REV 03; DOC.20041109.0006 DC#34722; TRN: US0600766
- Country of Publication:
- United States
- Language:
- English
Similar Records
Dissolved Concentration Limits of Radioactive Elements
Geochemical controls on radionuclide releases from a nuclear waste repository in basalt: estimated solubilities for selected elements
Related Subjects
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
MAXIMUM PERMISSIBLE CONCENTRATION
SOLUBILITY
ACTINIUM
AMERICIUM
CESIUM
CARBON
IODINE
LEAD
NEPTUNIUM
PLUTONIUM
PROTACTINIUM
RADIUM
STRONTIUM
TECHNETIUM
THERMODYNAMICS
THORIUM
URANIUM
GEOCHEMISTRY
RADIOACTIVE WASTE DISPOSAL