Waste Form Release Data Package for the 2005 Integrated Disposal Facility Performance Assessment

Pierce, Eric M. ; McGrail, B. Peter ; Rodriguez, Elsa A. ; Schaef, Herbert T. ; Saripalli, Prasad ; Serne, R. Jeffrey ; Krupka, Kenneth M. ; Martin, P. F. ; Baum, Steven R. ; Geiszler, Keith N. ; Reed, Lunde R. ; Shaw, Wendy J.

Pacific Northwest National Laboratory (U.S.)

关键词: Chemical Reactions;    Product Consistency Test;    Source Terms;    Puf;    Wastes;   

DOI  :  10.2172/15020942
RP-ID  :  PNNL-14805
RP-ID  :  AC05-76RL01830
RP-ID  :  15020942

美国|英语

来源: UNT Digital Library

【 摘 要 】

This data package documents the experimentally derived input data on the representative waste glasses; LAWA44, LAWB45, and LAWC22. This data will be used for Subsurface Transport Over Reactive Multi-phases (STORM) simulations of the Integrated Disposal Facility (IDF) for immobilized low-activity waste (ILAW). The STORM code will be used to provide the near-field radionuclide release source term for a performance assessment to be issued in July 2005. Documented in this data package are data related to 1) kinetic rate law parameters for glass dissolution, 2) alkali (Na+)-hydrogen (H+) ion exchange rate, 3) chemical reaction network of secondary phases that form in accelerated weathering tests, and 4) thermodynamic equilibrium constants assigned to these secondary phases. The kinetic rate law and Na+-H+ ion exchange rate were determined from single-pass flow-through experiments. Pressurized unsaturated flow (PUF) and product consistency (PCT) tests where used for accelerated weathering or aging of the glasses in order to determine a chemical reaction network of secondary phases that form. The majority of the thermodynamic data used in this data package were extracted from the thermody-namic database package shipped with the geochemical code EQ3/6, version 8.0. Because of the expected importance of 129I release from secondary waste streams being sent to IDF from various thermal treatment processes, parameter estimates for diffusional release and solubility-controlled release from cementitious waste forms were estimated from the available literature.