Long-term desorption behavior of uranium and neptunium in heterogeneous volcanic tuff materials /

Dean, Cynthia A.

关键词: AR FACILITIES;    DESORPTION;    MINING;    NEPTUNIUM;    PERFORMANCE;    SIMULATION;    SOLUBILITY;    SORPTION;    TRANSPORT;    TUFF;    URANIUM;    URANIUM 228;    YUCCA MOUNTAIN;   

DOI  :  10.2172/982224
RP-ID  :  LA-14419-T
PID  :  OSTI ID: 982224
Others  :  TRN: US1004378

学科分类：核能源与工程

美国|英语

来源: SciTech Connect

【 摘 要 】

Uranium and neptunium desorption were studied in long-term laboratory experiments using four well-characterized volcanic tuff cores collected from southeast of Yucca Mountain, Nevada. The objectives of the experiments were to 1. Demonstrate a methodology aimed at characterizing distributions of sorption parameters (attributes of multiple sorption sites) that can be applied to moderately-sorbing species in heterogeneous systems to provide more realistic reactive transport parameters and a more realistic approach to modeling transport in heterogeneous systems. 2. Focus on uranium and neptunium because of their high solubility, relatively weak sorption, and high contributions to predicted dose in Yucca Mountain performance assessments. Also, uranium is a contaminant of concern at many DOE legacy sites and uranium mining sites.