Thermal decomposition analysis of simulated high-level liquid waste in cold-cap

The cold cap floating on top of the molten glass pool in liquid fed joule-heated ceramic melter plays an important role for operation of the vitrification process. A series of such phenomena as evaporation, melting and thermal decomposition of HLLW (high-level liquid waste) takes place within the co...

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Main Authors: Kawai Kota, Fukuda Tatsuya, Nakano Yoshio, Takeshita Kenji
Format: Article
Language:English
Published: EDP Sciences 2016-01-01
Series:EPJ Nuclear Sciences & Technologies
Online Access:https://doi.org/10.1051/epjn/2016038
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spelling doaj-4538902e1bb94e3f9dcf70d3d16feb432021-03-02T09:26:19ZengEDP SciencesEPJ Nuclear Sciences & Technologies2491-92922016-01-0124410.1051/epjn/2016038epjn150072Thermal decomposition analysis of simulated high-level liquid waste in cold-capKawai KotaFukuda TatsuyaNakano YoshioTakeshita KenjiThe cold cap floating on top of the molten glass pool in liquid fed joule-heated ceramic melter plays an important role for operation of the vitrification process. A series of such phenomena as evaporation, melting and thermal decomposition of HLLW (high-level liquid waste) takes place within the cold-cap. An understanding of the varied thermal decomposition behavior of various nitrates constituting HLLW is necessary to elucidate a series of phenomena occurring within the cold-cap. In this study, reaction rates of the thermal decomposition reaction of 13 kinds of nitrates, which are main constituents of simulated HLLW (sHLLW), were investigated using thermogravimetrical instrument in a range of room temperature to 1000 °C. The reaction rates of the thermal decompositions of 13 kinds of nitrates were depicted according to composition ratio (wt%) of each nitrate in sHLLW. It was found that the thermal decomposition of sHLLW could be predicted by the reaction rates and reaction temperatures of individual nitrates. The thermal decomposition of sHLLW with borosilicate glass system was also investigated. The above mentioned results will be able to provide a useful knowledge for understanding the phenomena occurring within the cold-cap.https://doi.org/10.1051/epjn/2016038
collection DOAJ
language English
format Article
sources DOAJ
author Kawai Kota
Fukuda Tatsuya
Nakano Yoshio
Takeshita Kenji
spellingShingle Kawai Kota
Fukuda Tatsuya
Nakano Yoshio
Takeshita Kenji
Thermal decomposition analysis of simulated high-level liquid waste in cold-cap
EPJ Nuclear Sciences & Technologies
author_facet Kawai Kota
Fukuda Tatsuya
Nakano Yoshio
Takeshita Kenji
author_sort Kawai Kota
title Thermal decomposition analysis of simulated high-level liquid waste in cold-cap
title_short Thermal decomposition analysis of simulated high-level liquid waste in cold-cap
title_full Thermal decomposition analysis of simulated high-level liquid waste in cold-cap
title_fullStr Thermal decomposition analysis of simulated high-level liquid waste in cold-cap
title_full_unstemmed Thermal decomposition analysis of simulated high-level liquid waste in cold-cap
title_sort thermal decomposition analysis of simulated high-level liquid waste in cold-cap
publisher EDP Sciences
series EPJ Nuclear Sciences & Technologies
issn 2491-9292
publishDate 2016-01-01
description The cold cap floating on top of the molten glass pool in liquid fed joule-heated ceramic melter plays an important role for operation of the vitrification process. A series of such phenomena as evaporation, melting and thermal decomposition of HLLW (high-level liquid waste) takes place within the cold-cap. An understanding of the varied thermal decomposition behavior of various nitrates constituting HLLW is necessary to elucidate a series of phenomena occurring within the cold-cap. In this study, reaction rates of the thermal decomposition reaction of 13 kinds of nitrates, which are main constituents of simulated HLLW (sHLLW), were investigated using thermogravimetrical instrument in a range of room temperature to 1000 °C. The reaction rates of the thermal decompositions of 13 kinds of nitrates were depicted according to composition ratio (wt%) of each nitrate in sHLLW. It was found that the thermal decomposition of sHLLW could be predicted by the reaction rates and reaction temperatures of individual nitrates. The thermal decomposition of sHLLW with borosilicate glass system was also investigated. The above mentioned results will be able to provide a useful knowledge for understanding the phenomena occurring within the cold-cap.
url https://doi.org/10.1051/epjn/2016038
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AT takeshitakenji thermaldecompositionanalysisofsimulatedhighlevelliquidwasteincoldcap
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