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Title: The Impact of Proposed delta Gp Limits on Glass Formulation Efforts: Part 1:. Model-Based Assessments

Abstract

The Savannah River National Laboratory (SRNL) has initiated studies to assess alternative durability options that may provide access to compositional regions of interest in support of the accelerated cleanup mission at the Defense Waste Processing Facility (DWPF). One of the options being pursued is the redefinition of the durability model acceptability limits. Some of the conservative steps used in establishing the current limits without comprising the high confidence required for meeting the specification on the wasteform quality were identified and eliminated. The results led to a set of three new Property Acceptability Region (PAR) values for the preliminary glass dissolution estimator or free energy of hydration durability model which have the potential to allow access to compositional regions of interest to improve melt rate or waste throughput. Although these limits are available for implementation, there is currently no driving force to do so (i.e., the current Frit 418 - Sludge Batch 3 (SB3) system is liquidus temperature (TL) limited). In this report, glass formulations were identified with the intent of generating incentive for applying the new durability limits for SB3. More specifically, higher alkali frit compositions were identified or developed to transition into and through the region of .Gp acceptabilitymore » as defined by the current and proposed durability limits. All other property prediction criteria were satisfied. An eight glass test matrix has been identified to meet these objectives. These glasses will be fabricated in the laboratory and their durability measured and compared to model predictions (and to the assessments by the index system). Although incentive for implementation of the proposed durability limits could be demonstrated through the measured durability response for these higher alkali systems, assessments of melt rate should also be performed to establish a clear motive or driver to implement a frit change. More specifically, a ''significant'' increase in melt rate may be required to provide the incentive for DWPF to implement the change rather than a ''paper study'' and/or durability assessment.« less

Authors:
Publication Date:
Research Org.:
Savannah River Site (SRS), Aiken, SC (United States)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
835620
Report Number(s):
WSRC-TR-2004-00203
TRN: US0500124
DOE Contract Number:  
AC09-96SR18500
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 1 Jul 2004
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; DISSOLUTION; FORECASTING; FREE ENERGY; GLASS; GLOBAL POSITIONING SYSTEM; HYDRATION; HYDROXIDES; IMPLEMENTATION; SLUDGES; SPECIFICATIONS; WASTE FORMS; WASTE PROCESSING; WASTES; DURABILITY; DEFENSE WASTE PROCESSING FACILITY (DWPF); PCT; VISCOSITY

Citation Formats

PEELER, DAVID. The Impact of Proposed delta Gp Limits on Glass Formulation Efforts: Part 1:. Model-Based Assessments. United States: N. p., 2004. Web. doi:10.2172/835620.
PEELER, DAVID. The Impact of Proposed delta Gp Limits on Glass Formulation Efforts: Part 1:. Model-Based Assessments. United States. https://doi.org/10.2172/835620
PEELER, DAVID. 2004. "The Impact of Proposed delta Gp Limits on Glass Formulation Efforts: Part 1:. Model-Based Assessments". United States. https://doi.org/10.2172/835620. https://www.osti.gov/servlets/purl/835620.
@article{osti_835620,
title = {The Impact of Proposed delta Gp Limits on Glass Formulation Efforts: Part 1:. Model-Based Assessments},
author = {PEELER, DAVID},
abstractNote = {The Savannah River National Laboratory (SRNL) has initiated studies to assess alternative durability options that may provide access to compositional regions of interest in support of the accelerated cleanup mission at the Defense Waste Processing Facility (DWPF). One of the options being pursued is the redefinition of the durability model acceptability limits. Some of the conservative steps used in establishing the current limits without comprising the high confidence required for meeting the specification on the wasteform quality were identified and eliminated. The results led to a set of three new Property Acceptability Region (PAR) values for the preliminary glass dissolution estimator or free energy of hydration durability model which have the potential to allow access to compositional regions of interest to improve melt rate or waste throughput. Although these limits are available for implementation, there is currently no driving force to do so (i.e., the current Frit 418 - Sludge Batch 3 (SB3) system is liquidus temperature (TL) limited). In this report, glass formulations were identified with the intent of generating incentive for applying the new durability limits for SB3. More specifically, higher alkali frit compositions were identified or developed to transition into and through the region of .Gp acceptability as defined by the current and proposed durability limits. All other property prediction criteria were satisfied. An eight glass test matrix has been identified to meet these objectives. These glasses will be fabricated in the laboratory and their durability measured and compared to model predictions (and to the assessments by the index system). Although incentive for implementation of the proposed durability limits could be demonstrated through the measured durability response for these higher alkali systems, assessments of melt rate should also be performed to establish a clear motive or driver to implement a frit change. More specifically, a ''significant'' increase in melt rate may be required to provide the incentive for DWPF to implement the change rather than a ''paper study'' and/or durability assessment.},
doi = {10.2172/835620},
url = {https://www.osti.gov/biblio/835620}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jul 01 00:00:00 EDT 2004},
month = {Thu Jul 01 00:00:00 EDT 2004}
}