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

We present that the effectiveness of high-level waste vitrification at Hanford's Waste Treatment and Immobilization Plant may be limited by precipitation/accumulation of spinel crystals [(Fe, Ni, Mn, Zn)(Fe, Cr) 2O 4] in the glass discharge riser of Joule-heated ceramic melters during idling. These crystals do not affect glass durability; however, if accumulated in thick layers, 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 underprediction of accumulated layers, which gradually worsened over time as an increased number of agglomerates formed. In conclusion, the accumulation rate of ~53.8 ± 3.7 μm/h determined for this glass will result in a ~26 mm-thick layer after 20 days of melter idling.
Authors:
 [1] ;  [1] ;  [2] ;  [3]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States); U.S. Department of Energy, Office of River Protection, Richland, WA (United States)
  3. U.S. Department of Energy, Office of River Protection, Richland, WA (United States)
Publication Date:
Report Number(s):
PNNL-SA-125881
Journal ID: ISSN 0022-3115; PII: S002231151730449X
Grant/Contract Number:
AC05-76RL01830
Type:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 495; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
OSTI Identifier:
1379944

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., 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.. 2017. "Predictive modeling of crystal accumulation in high-level waste glass melters processing radioactive waste". United States. doi:10.1016/j.jnucmat.2017.08.034. https://www.osti.gov/servlets/purl/1379944.
@article{osti_1379944,
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 = {We present that the effectiveness of high-level waste vitrification at Hanford's Waste Treatment and Immobilization Plant may be 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 layers, 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 underprediction of accumulated layers, which gradually worsened over time as an increased number of agglomerates formed. In conclusion, the accumulation rate of ~53.8 ± 3.7 μm/h determined for this glass will result in a ~26 mm-thick layer after 20 days of melter idling.},
doi = {10.1016/j.jnucmat.2017.08.034},
journal = {Journal of Nuclear Materials},
number = ,
volume = 495,
place = {United States},
year = {2017},
month = {8}
}