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.

关键词: AR FACILITIES;    CAPACITY;    DIFFUSION;    IODINE;    KRYPTON;    ORNL;    RADIOISOTOPES;    REMOVAL;    SILICA;    SILICON CARBIDES;    SORPTION;    WASTE FORMS Iodine-129;    Carbon-14;    Krypton-85;    Xenon;    radioactive waste;    volatile radionuclides;    metal organic framework;    aerogel;    chalcogel;    silicon carbide;    diffusion;    Environmental Molecular Sciences Laboratory;   

DOI  :  10.2172/1031440
RP-ID  :  PNNL-20807
PID  :  OSTI ID: 1031440
Others  :  Other: 42495
Others  :  AF5805000
Others  :  TRN: US1200113

学科分类：核能源与工程

美国|英语

来源: SciTech Connect

【 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.