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Title: Transport of Technetium and Rhenium into Refractory Materials during Bulk Vitrification

Abstract

Bulk vitrification (BV) was selected as a potential supplemental treatment to accelerate the cleanup of low-activity waste (LAW) at the U.S. Department of Energy Hanford Site. In the BV process, low-activity waste, soil, and glass forming chemicals are mixed, dried and placed in a metal box lined with a castable refractory block (CRB). Electric current, supplied by two graphite electrodes in the box, melts the waste feed and produces a durable glass waste form. During engineering-scale (ES) tests of BV, a small fraction of radioactive technetium-99 (Tc) (and rhenium [Re], a nonradioactive surrogate) were transferred out of the LAW glass feed and molten LAW glass, and deposited on the surface and within the pores of the CRB. Tc is a primary risk driver for long-term performance of immobilized LAW; therefore, even small fractions of Tc present in a readily leachable form rather than immobilized in a glass matrix can impact long-term performance.

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
979528
Report Number(s):
PNNL-SA-48697
830403000; TRN: US1003199
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Conference
Resource Relation:
Conference: Waste Management '06: Global Accomplishments in Environmental and Radioactive Waste Management: Education and Opportunity for the Next Generation of Waste Management Professionals
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; EDUCATION; ELECTRIC CURRENTS; ELECTRODES; GLASS; GRAPHITE; PERFORMANCE; RADIOACTIVE WASTE MANAGEMENT; RHENIUM; TECHNETIUM; TECHNETIUM 99; TRANSPORT; VITRIFICATION; WASTE FORMS; WASTE MANAGEMENT; WASTES

Citation Formats

Bagaasen, Larry M., Brouns, Thomas M., Elliott, Michael L., Hrma, Pavel R., Kim, Dong-Sang, Matyas, Josef, Pierce, Eric M., McGrail, B. Peter, Schweiger, Michael J., Campbell, Brett E., and Beck, Andrew E. Transport of Technetium and Rhenium into Refractory Materials during Bulk Vitrification. United States: N. p., 2006. Web.
Bagaasen, Larry M., Brouns, Thomas M., Elliott, Michael L., Hrma, Pavel R., Kim, Dong-Sang, Matyas, Josef, Pierce, Eric M., McGrail, B. Peter, Schweiger, Michael J., Campbell, Brett E., & Beck, Andrew E. Transport of Technetium and Rhenium into Refractory Materials during Bulk Vitrification. United States.
Bagaasen, Larry M., Brouns, Thomas M., Elliott, Michael L., Hrma, Pavel R., Kim, Dong-Sang, Matyas, Josef, Pierce, Eric M., McGrail, B. Peter, Schweiger, Michael J., Campbell, Brett E., and Beck, Andrew E. Tue . "Transport of Technetium and Rhenium into Refractory Materials during Bulk Vitrification". United States. doi:.
@article{osti_979528,
title = {Transport of Technetium and Rhenium into Refractory Materials during Bulk Vitrification},
author = {Bagaasen, Larry M. and Brouns, Thomas M. and Elliott, Michael L. and Hrma, Pavel R. and Kim, Dong-Sang and Matyas, Josef and Pierce, Eric M. and McGrail, B. Peter and Schweiger, Michael J. and Campbell, Brett E. and Beck, Andrew E.},
abstractNote = {Bulk vitrification (BV) was selected as a potential supplemental treatment to accelerate the cleanup of low-activity waste (LAW) at the U.S. Department of Energy Hanford Site. In the BV process, low-activity waste, soil, and glass forming chemicals are mixed, dried and placed in a metal box lined with a castable refractory block (CRB). Electric current, supplied by two graphite electrodes in the box, melts the waste feed and produces a durable glass waste form. During engineering-scale (ES) tests of BV, a small fraction of radioactive technetium-99 (Tc) (and rhenium [Re], a nonradioactive surrogate) were transferred out of the LAW glass feed and molten LAW glass, and deposited on the surface and within the pores of the CRB. Tc is a primary risk driver for long-term performance of immobilized LAW; therefore, even small fractions of Tc present in a readily leachable form rather than immobilized in a glass matrix can impact long-term performance.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Feb 21 00:00:00 EST 2006},
month = {Tue Feb 21 00:00:00 EST 2006}
}

Conference:
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