Technetium Waste Form Development Progress Report

Buck, Edgar C.

Pacific Northwest National Laboratory (U.S.)

关键词: Alloys;    Microanalysis;    Waste Forms;    Retention;    Processing;   

DOI  :  10.2172/1048014
RP-ID  :  PNNL-19195
RP-ID  :  AC05-76RL01830
RP-ID  :  1048014

美国|英语

来源: UNT Digital Library

【 摘 要 】

The approach being followed to evaluate the use of an iron-based alloy waste form to immobilize the Tc-bearing waste streams generated during the aqueous and electrochemical processing of used fuel that is being studied in the DOE Advanced Fuel Cycle Initiative (AFCI) is presented in this report. The objective is to develop an alloy waste form that provides high waste loading within waste form processing limitations, meets waste form performance requirements for durability and the long-term retention of radionuclides, and can be produced with consistent physical, chemical, and radiological properties that meet regulatory acceptance requirements for disposal. Microanalysis using scanning electron microscopy (SEM) and transmission electron microscopy (TEM) was used to analyze non-radioactive Fe-Mo-Re samples. A sample was prepared for SEM; however, significant unforeseen instrument problems led to delays in conducting the detailed work. The TEM was not available for this particular sample and therefore only preliminary SEM work can be reported. The results are in agreement with previous studies [Ebert 2009]; however, a rhenium-rich region within the Re-Mo phase is clearly visible.