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Title: Crystal-Tolerant Glass Approach For Mitigation Of Crystal Accumulation In Continuous Melters Processing Radioactive Waste

Abstract

High-level radioactive waste melters are projected to operate in an inefficient manner as they are subjected to artificial constraints, such as minimum liquidus temperature (T{sub L}) or maximum equilibrium fraction of crystallinity at a given temperature. These constraints substantially limit waste loading, but were imposed to prevent clogging of the melter with spinel crystals [(Fe, Ni, Mn, Zn)(Fe, Cr){sub 2}O{sub 4}]. In the melter, the glass discharge riser is the most likely location for crystal accumulation during idling because of low glass temperatures, stagnant melts, and small diameter. To address this problem, a series of lab-scale crucible tests were performed with specially formulated glasses to simulate accumulation of spinel in the riser. Thicknesses of accumulated layers were incorporated into empirical model of spinel settling. In addition, T{sub L} of glasses was measured and impact of particle agglomeration on accumulation rate was evaluated. Empirical model predicted well the accumulation of single crystals and/or smallscale 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 ~14.9 +- 1 nm/s determined for this glass will result in ~26 mm thick layer in 20more » days of melter idling.« less

Authors:
 [1];  [2];  [2];  [2];  [2];  [2]
  1. Department of Energy, Office of River Protection, Richland, Washington (United States)
  2. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Publication Date:
Research Org.:
Hanford Site (HNF), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Environmental Management (EM) (United States)
OSTI Identifier:
1053811
Report Number(s):
ORP-52717 Rev 0
TRN: US1300301
DOE Contract Number:  
DE-AC06-09RL14728
Resource Type:
Journal Article
Journal Name:
Journal Of The American Ceramic Society
Additional Journal Information:
Journal Name: Journal Of The American Ceramic Society
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; High-level waste; Vitrification; Melter; Spinel crystals; Accumulation; Empirical model; Agglomeration; Liquidus temperature; Crystal-tolerant glass

Citation Formats

Kruger, Albert A., Rodriguez, Carmen P., Lang, Jesse B., Huckleberry, Adam R., Matyas, Josef, and Owen, Antoinette T. Crystal-Tolerant Glass Approach For Mitigation Of Crystal Accumulation In Continuous Melters Processing Radioactive Waste. United States: N. p., 2012. Web.
Kruger, Albert A., Rodriguez, Carmen P., Lang, Jesse B., Huckleberry, Adam R., Matyas, Josef, & Owen, Antoinette T. Crystal-Tolerant Glass Approach For Mitigation Of Crystal Accumulation In Continuous Melters Processing Radioactive Waste. United States.
Kruger, Albert A., Rodriguez, Carmen P., Lang, Jesse B., Huckleberry, Adam R., Matyas, Josef, and Owen, Antoinette T. Tue . "Crystal-Tolerant Glass Approach For Mitigation Of Crystal Accumulation In Continuous Melters Processing Radioactive Waste". United States. https://www.osti.gov/servlets/purl/1053811.
@article{osti_1053811,
title = {Crystal-Tolerant Glass Approach For Mitigation Of Crystal Accumulation In Continuous Melters Processing Radioactive Waste},
author = {Kruger, Albert A. and Rodriguez, Carmen P. and Lang, Jesse B. and Huckleberry, Adam R. and Matyas, Josef and Owen, Antoinette T.},
abstractNote = {High-level radioactive waste melters are projected to operate in an inefficient manner as they are subjected to artificial constraints, such as minimum liquidus temperature (T{sub L}) or maximum equilibrium fraction of crystallinity at a given temperature. These constraints substantially limit waste loading, but were imposed to prevent clogging of the melter with spinel crystals [(Fe, Ni, Mn, Zn)(Fe, Cr){sub 2}O{sub 4}]. In the melter, the glass discharge riser is the most likely location for crystal accumulation during idling because of low glass temperatures, stagnant melts, and small diameter. To address this problem, a series of lab-scale crucible tests were performed with specially formulated glasses to simulate accumulation of spinel in the riser. Thicknesses of accumulated layers were incorporated into empirical model of spinel settling. In addition, T{sub L} of glasses was measured and impact of particle agglomeration on accumulation rate was evaluated. Empirical model predicted well the accumulation of single crystals and/or smallscale 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 ~14.9 +- 1 nm/s determined for this glass will result in ~26 mm thick layer in 20 days of melter idling.},
doi = {},
journal = {Journal Of The American Ceramic Society},
number = ,
volume = ,
place = {United States},
year = {2012},
month = {8}
}