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Title: Predictive modeling of crystal accumulation in high-level waste glass melters processing radioactive waste

Abstract

The effectiveness of HLW vitrification is limited by precipitation/accumulation of spinel crystals [(Fe, Ni, Mn, Zn)(Fe, Cr)2O4] in the glass discharge riser of Joule-heated ceramic melters during idling. These crystals do not affect glass durability; however, if accumulated in thick layer, they can clog the melter and prevent discharge of molten glass into canisters. To address this problem, an empirical model was developed that can predict thicknesses of accumulated layers as a function of glass composition. This model predicts well the accumulation of single crystals and/or small-scale agglomerates, but, excessive agglomeration observed in high-Ni-Fe glass resulted in an under-prediction of accumulated layers, which gradually worsen over time as an increased number of agglomerates formed. Accumulation rate of ~53.8 ± 3.7 µm/h determined for this glass will result in ~26 mm thick layer in 20 days of melter idling.

Authors:
; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1414530
Report Number(s):
PNNL-SA-125881
Journal ID: ISSN 0022-3115; 830403000
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Nuclear Materials; Journal Volume: 495; Journal Issue: C
Country of Publication:
United States
Language:
English
Subject:
Vitrification; HLW Glass; Melter; Crystal accumulation; Empirical model

Citation Formats

Matyáš, Josef, Gervasio, Vivianaluxa, Sannoh, Sulaiman E., and Kruger, Albert A.. Predictive modeling of crystal accumulation in high-level waste glass melters processing radioactive waste. United States: N. p., 2017. Web. doi:10.1016/j.jnucmat.2017.08.034.
Matyáš, Josef, Gervasio, Vivianaluxa, Sannoh, Sulaiman E., & Kruger, Albert A.. Predictive modeling of crystal accumulation in high-level waste glass melters processing radioactive waste. United States. doi:10.1016/j.jnucmat.2017.08.034.
Matyáš, Josef, Gervasio, Vivianaluxa, Sannoh, Sulaiman E., and Kruger, Albert A.. Wed . "Predictive modeling of crystal accumulation in high-level waste glass melters processing radioactive waste". United States. doi:10.1016/j.jnucmat.2017.08.034.
@article{osti_1414530,
title = {Predictive modeling of crystal accumulation in high-level waste glass melters processing radioactive waste},
author = {Matyáš, Josef and Gervasio, Vivianaluxa and Sannoh, Sulaiman E. and Kruger, Albert A.},
abstractNote = {The effectiveness of HLW vitrification is limited by precipitation/accumulation of spinel crystals [(Fe, Ni, Mn, Zn)(Fe, Cr)2O4] in the glass discharge riser of Joule-heated ceramic melters during idling. These crystals do not affect glass durability; however, if accumulated in thick layer, they can clog the melter and prevent discharge of molten glass into canisters. To address this problem, an empirical model was developed that can predict thicknesses of accumulated layers as a function of glass composition. This model predicts well the accumulation of single crystals and/or small-scale agglomerates, but, excessive agglomeration observed in high-Ni-Fe glass resulted in an under-prediction of accumulated layers, which gradually worsen over time as an increased number of agglomerates formed. Accumulation rate of ~53.8 ± 3.7 µm/h determined for this glass will result in ~26 mm thick layer in 20 days of melter idling.},
doi = {10.1016/j.jnucmat.2017.08.034},
journal = {Journal of Nuclear Materials},
number = C,
volume = 495,
place = {United States},
year = {Wed Nov 01 00:00:00 EDT 2017},
month = {Wed Nov 01 00:00:00 EDT 2017}
}