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Title: Remediation on off-gas system deposits in a radioactive waste glass melter

Since the early 1980's, research glass melters have been used at the Savannah River Laboratory (SRL) to develop the reference vitrification process for immobilization of high level radioactive waste. One of the operating concerns for these melters has been the pluggage of the off-gas system with solid deposits. Samples of these deposits were analyzed to be mixture of alkali-rich chlorides, sulfates, borates, and fluorides with entrained Fe{sub 2}O{sub 3} spinel, and frit particles. The spatial distribution of these deposits throughout the off-gas system indicates that they form by vapor-phase transport and subsequently condensation. Condensation of the alkali-rich phases cements entrained particulates causing the off-gas line to plug. It is concluded that off-gas system pluggage can be effectively controlled by maintaining the off-gas velocity above 16 m/s, while maintaining the off-gas temperature as high as practical below the glass softening point. This paper summarizes the results of chemical and physical analyses of off-gas deposit samples from various melters at SRL. Recent design changes made to the Defense Waste Processing Facility (DWPF) at the Savannah River Site (SRS) to alleviate the pluggage problem are also discussed.
Authors:
; ;
Publication Date:
OSTI Identifier:
5788455
Report Number(s):
WSRC-MS-91-400; CONF-911040--12
ON: DE92008827
DOE Contract Number:
AC09-89SR18035
Resource Type:
Conference
Resource Relation:
Conference: International waste management conference, Seoul (Korea, Republic of), 21-26 Oct 1991
Research Org:
Westinghouse Savannah River Co., Aiken, SC (United States)
Sponsoring Org:
DOE; USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; CERAMIC MELTERS; OFF-GAS SYSTEMS; BUILDUP; BORATES; CHEMICAL ANALYSIS; CHLORIDES; FLUORIDES; IRON OXIDES; RADIOACTIVE WASTE PROCESSING; REMEDIAL ACTION; SAVANNAH RIVER PLANT; SPINELS; SULFATES; VITRIFICATION; BORON COMPOUNDS; CHALCOGENIDES; CHLORINE COMPOUNDS; ELECTRIC FURNACES; FLUORINE COMPOUNDS; FURNACES; HALIDES; HALOGEN COMPOUNDS; IRON COMPOUNDS; MANAGEMENT; MINERALS; NATIONAL ORGANIZATIONS; OXIDE MINERALS; OXIDES; OXYGEN COMPOUNDS; PROCESSING; RADIOACTIVE WASTE MANAGEMENT; SULFUR COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; US AEC; US DOE; US ERDA; US ORGANIZATIONS; WASTE MANAGEMENT; WASTE PROCESSING 052001* -- Nuclear Fuels-- Waste Processing