Summary Report on the Volatile Radionuclide and Immobilization Research for FY2011 at PNNL

Strachan, Denis M. ; Chun, Jaehun ; Matyas, Josef ; Lepry, William C. ; Riley, Brian J. ; Ryan, Joseph V. ; Thallapally, Praveen K.

Pacific Northwest National Laboratory (U.S.)

关键词: Silicon Carbide;    Krypton-85;    Ornl;    12 Management Of Radioactive Wastes, And Non-Radioactive Wastes From Nuclear Facilities;    Carbon-14;   

DOI  :  10.2172/1031440
RP-ID  :  PNNL-20807
RP-ID  :  AC05-76RL01830
RP-ID  :  1031440

美国|英语

来源: UNT Digital Library

【 摘 要 】

The materials development summarized here is in support of the Waste Forms campaign, Volatile Radionuclide task. Specifically, materials are being developed for the removal and immobilization of iodine and krypton, specifically 129I and 85Kr. During FY 2011, aerogel materials were investigated for removal and immobilization of 129I. Two aerogel formulations were investigated, one based on silica aerogels and the second on chalcogen-based aerogels (i.e., chalcogels). A silica aerogel was tested at ORNL for total I2 sorption capacity. It was determined to have 48 mass% capacity while having little physisorbed I2 (I2 not taken up in the aerogel pores). For 85Kr, metal organic framework (MOF) structures were investigated and a new MOF with about 8 mass% capacity for Xe and Kr. The selectivity can be changed from Xe > Kr to Xe < Kr simply by lowering the temperature below 0 C. A patent disclosure has been filed. Lastly, silicon carbide (SiC) was loaded with Kr. The diffusion of Kr in SiC was found to be less than detectable at 500 C.