Radionuclide Retention in Concrete Wasteforms

Bovaird, Chase C. ; Jansik, Danielle P. ; Wellman, Dawn M. ; Wood, Marcus I.

关键词: AR FACILITIES;    AGING;    CEMENTS;    CONCRETES;    FORECASTING;    GROUTING;    PERFORMANCE;    PRECIPITATION;    RADIOISOTOPES;    RADIONUCLIDE MIGRATION;    RETENTION;    SORPTION;    WASTE FORMS;    WASTES Concrete;    Carbonation;   

DOI  :  10.2172/1028565
RP-ID  :  PNNL-20760
PID  :  OSTI ID: 1028565
Others  :  Other: 830403000
Others  :  TRN: US1106015

学科分类：核能源与工程

美国|英语

来源: SciTech Connect

【 摘 要 】

Assessing long-term performance of Category 3 waste cement grouts for radionuclide encasement requires knowledge of the radionuclide-cement interactions and mechanisms of retention (i.e., sorption or precipitation); the mechanism of contaminant release; the significance of contaminant release pathways; how wasteform performance is affected by the full range of environmental conditions within the disposal facility; the process of wasteform aging under conditions that are representative of processes occurring in response to changing environmental conditions within the disposal facility; the effect of wasteform aging on chemical, physical, and radiological properties; and the associated impact on contaminant release. This knowledge will enable accurate prediction of radionuclide fate when the wasteforms come in contact with groundwater. The information present in the report provides data that (1) measures the effect of concrete wasteform properties likely to influence radionuclide migration; and (2) quantifies the rate of carbonation of concrete materials in a simulated vadose zone repository.