Application of evolved gas analysis to cold-cap reactions of melter feeds for nuclear waste vitrification

Kruger, Albert A. ; Chun, Jaehun ; Hrma, Pavel R. ; Rodriguez, Carmen P. ; Schweiger, Michael J.

关键词: Cold-cap reactions;    Evolved gas analysis;    Nuclear waste vitrification;    Kinetic models;   

DOI  :  10.2172/1132515
RP-ID  :  ORP-56879 Rev. 0
PID  :  OSTI ID: 1132515

学科分类：核能源与工程

美国|英语

来源: SciTech Connect

【 摘 要 】

In the vitrification of nuclear wastes, the melter feed (a mixture of nuclear waste and glass-forming and modifying additives) experiences multiple gas-evolving reactions in an electrical glass-melting furnace. We employed the thermogravimetry-gas chromatography-mass spectrometry (TGA-GC-MS) combination to perform evolved gas analysis (EGA). Apart from identifying the gases evolved, we performed quantitative analysis relating the weighed sum of intensities of individual gases linearly proportional with the differential themogravimetry. The proportionality coefficients were obtained by three methods based on the stoichiometry, least squares, and calibration. The linearity was shown to be a good first-order approximation, in spite of the complicated overlapping reactions.