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Title: 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 wastemore » packages and the invert. Uncertainties from thermodynamic data, water chemistry, temperature variation, and activity coefficients have been quantified or otherwise addressed.« less
Authors:
Publication Date:
OSTI Identifier:
859259
Report Number(s):
ANL-WIS-MD-000010 REV 03
DOC.20041109.0006 DC#34722; TRN: US0600766
DOE Contract Number:
NA
Resource Type:
Technical Report
Research Org:
Office of Scientific and Technical Information, Oak Ridge, TN
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; 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