27 Matching Results

Search Results

Advanced search parameters have been applied.

in creator/contributor: "Ebert, W.L."

open access

A comparison of glass reaction at high and low SA/V: PCT vs MCC-1

Leach tests have been performed at surface area/volume (SA/V) of 10, 2000, and 20,000 m{sup {minus}1} using actinide-doped borosilicate waste glass (SRL 131 and SRL 202) to assess the effects of the SA/V on the mechanism and rate of the glass reaction. Solution results are presented which show the major effect of the SA/V to be dilution. Higher SA/V result in higher leachate pH values being attained due to initial ion exchange reactions. The higher pH values then accelerate hydrolysis of the gl… more

Date: January 1, 1992

Creator: Ebert, W.L. & Bates, J.K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

High-level nuclear waste borosilicate glass: A compendium of characteristics

With the imminent startup, in the United States, of facilities for vitrification of high-level nuclear waste, a document has been prepared that compiles the scientific basis for understanding the alteration of the waste glass products under the range of service conditions to which they may be exposed during storage, transportation, and eventual geologic disposal. A summary of selected parts of the content of this document is provided. Waste glass alterations in a geologic repository may include… more

Date: January 1, 1992

Creator: Cunnane, J.C.; Bates, J.K.; Ebert, W.L.; Feng, X.; Mazer, J.J.; Wronkiewicz, D.J. (Argonne National Lab., IL (United States)) et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Laboratory testing of West Valley reference 6 glass

A series of laboratory tests is being conducted to characterize the corrosion of West Valley reference 6 glass (WV6) and to provide parametric values for modeling its long-term durability. Models require measurement of the corrosion rate in the absence of corrosion products and in fluids that are {open_quotes}saturated{close_quotes} with corrosion products, and the identification of alteration phases. Corrosion rates in dilute and saturated conditions were measured using MCC-1 and PCT tests, re… more

Date: July 1, 1995

Creator: Ebert, W.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

The corrosion behavior of DWPF glasses

The authors analyzed the corroded surfaces of reference glasses developed for the Defense Waste Processing Facility (DWPF) to characterize their corrosion behavior. The corrosion mechanism of nuclear waste glasses must be known in order to provide source terms describing radionuclide release for performance assessment calculations. Different DWPF reference glasses were corroded under conditions that highlighted various aspects of the corrosion process and led to different extents of corrosion. … more

Date: June 1, 1995

Creator: Ebert, W.L. & Bates, J.K.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Performance testing of West Valley Reference 6 glass

The chemical durability of West Valley Reference 6 glass is being evaluated by using a suite of laboratory tests which highlight the early, interim, and long-term stages of corrosion. The test results are being used to describe the glass corrosion path and its long-term durability. The long-term durability of the SRL Environmental Assessment glass is being evaluated for comparison. Test results also provide parameter values for an analytical corrosion model that can be used in performance asses… more

Date: June 1, 1995

Creator: Ebert, W.L. & Bates, J.K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

NNWSI [Nevada Nuclear Waste Storage Investigation] waste form testing at Argonne National Laboratory; Semiannual report, July--December 1987

Tests are ongoing at Argonne National Laboratory to examine the reaction of glass with water under conditions that may exist in the proposed repository at Yucca Mountain, Nevada. Examination of glass reaction using the Unsaturated Test method as applied to simulated defense glass (SRL 165 black frit based) and simulated West Valley glass (ATM-10) is ongoing. The tests on SRL 165 glass have been ongoing for 104 weeks with nonstoichiometric release of Li, Na, B, and actinide elements being observ… more

Date: July 1, 1988

Creator: Bates, J.K.; Gerding, T.J.; Ebert, W.L.; Mazer, J.J. & Biwer, B.M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

The importance of secondary phases in glass corrosion

The analytical expression used to model glass reaction in computer simulations such as EQ6 is compared to experiments used to support the simulations. The expression correctly predicts the acceleration observed in experiments performed at high glass surface area/leachant volume ratios (SA/V) upon the formation of secondary phases. High resolution microscopal analysis of reacted glass samples suggests that the accelerated nature of the reaction after secondary phase formation is due to changes i… more

Date: December 31, 1990

Creator: Ebert, W.L. & Bates, J.K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Corrosion behavior of environmental assessment glass in product consistency tests of extended duration.

We have conducted static dissolution tests to study the corrosion behavior of the Environmental Assessment (EA) glass, which is the benchmark glass for high-level waste glasses being produced at US Department of Energy facilities. These tests were conducted to evaluate the behavior of the EA glass under the same long-term and accelerated test conditions that are being used to evaluate the corrosion of waste glasses. Tests were conducted at 90 C in a tuff groundwater solution at glass surface ar… more

Date: November 18, 1998

Creator: Bates, J.K.; Buck, E.C.; Ebert, W.L.; Luo, J.S. & Tam, S.W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Nuclear waste programs; Semiannual progress report, October 1991--March 1992

This document reports on the work done by the Nuclear Waste Programs of the Chemical Technology Division (CMT), Argonne National Laboratory, in the period October 1991-March 1992. In these programs, studies are underway on the performance of waste glass and spent fuel in projected nuclear repository conditions to provide input to the licensing of the nation`s high-level waste repositories

Date: November 1, 1993

Creator: Bates, J.K.; Bradley, C.R.; Buck, E.C.; Dietz, N.L.; Ebert, W.L.; Emery, J.W. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

The reaction of synthetic nuclear waste glass in steam and hydrothermal solution

Glass monoliths of the WVCM 44, WVCM 50, SRL 165, and SRL 202 compositions were reacted in steam and in hydrothermal liquid at 200{degree}C. The glass reaction resulted in the formation of leached surface layers in both environments. The reaction in steam proceeds at a very low rate until precipitates form, after which the glass reaction proceeds at a greater rate. Precipitates were formed on all glass types reacted in steam. The assemblage of phases formed was unique to each glass type, but se… more

Date: December 31, 1989

Creator: Ebert, W.L. & Bates, J.K.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Accelerated glass reaction under PCT conditions

Static leach tests similar to PCT (Product Consistency Test) were performed for up to 2 years to assess long-term reaction behavior of high-level nuclear waste glasses similar to those at Defense Waste Processing Facility. These tests show the reaction rate to decrease with the reaction time from an initially high rate to a low rate, but then to accelerate to a higher rate after reaction times of about 1 year, depending on glass surface area/leachant volume ratio used. Solution concentrations o… more

Date: January 1, 1992

Creator: Ebert, W.L.; Bates, J.K.; Buck, E.C. & Bradley, C.R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Analytical electron microscopy study of colloids from nuclear waste glass reaction

An Analytical Electron Microscopy study of colloidal particles formed during reaction of wste glass has been performed. The effect of waste glass test parameters on colloid formation is examined. Characterization of phases present in the leachate of these tests has shown that layers spalled from the glass and precipitated phases are both sources of colloids in the leachate. Elements, such as uranium, have been found to concentrate within colloidal particles in the leachate.

Date: January 1, 1992

Creator: Buck, E.C.; Bates, J.K.; Cunnane, J.C.; Ebert, W.L.; Feng, X. & Wronkiewicz, D.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Uptakes of CS and SR on San Joaquin Soil Measured Following Astm Method c1733.

Series of tests were conducted following ASTM Standard Procedure C1733 to evaluate the repeatability of the test and the effects of several test parameters, including the solution-to-soil mass ratio, test duration, pH, and the concentrations of contaminants in the solution. This standard procedure is recommended for measuring the distribution coefficient (K{sub d}) of a contaminant in a specific soil/groundwater system. One objective of the current tests was to identify experimental conditions … more

Date: April 4, 2012

Creator: Ebert, W.L. & Petri, E.T. (Chemical Sciences and Engineering Division)

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Laboratory testing of LITCO glasses

The purpose of this program is to measure, the intermediate and long-term durability of glasses developed by Lockheed Idaho Technology Co. (LITCO) for the immobilization of calcined radioactive wastes. The objective is to use accelerated corrosion tests as an aid in developing durable waste form compositions. This is a report of tests performed on two LITCO glass compositions, Formula 127 and Formula 532. The main avenue for release of radionuclides into the environment in a geologic repository… more

Date: June 1, 1995

Creator: Ellison, A.; Wolf, S.; Buck, E.; Luo, J.S.; Dietz, N.; Bates, J.K. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Effect of alteration phase formation on the glass dissolution rate

The dissolution rates of many glasses have been observed to increase upon the formation of certain alteration phases. It is important to understand the mechanism by which alteration phases affect glass corrosion behavior and the glass dissolution rate to reliably predict whether or not similar effects will occur in a disposal environment and the impact of phase formation on the long-term performance of waste glass. While solid state transformation of a glass to thermodynamically more stable pha… more

Date: October 1, 1997

Creator: Ebert, W.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Dissolution rates of DWPF glasses from long-term PCT

We have characterized the corrosion behavior of several Defense Waste Processing Facility (DWPF) reference waste glasses by conducting static dissolution tests with crushed glasses. Glass dissolution rates were calculated from measured B concentrations in tests conducted for up to five years. The dissolution rates of all glasses increased significantly after certain alteration phases precipitated. Calculation of the dissolution rates was complicated by the decrease in the available surface area… more

Date: December 31, 1996

Creator: Ebert, W.L. & Tam, S.W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

The reaction of SRL 202 glass in J-13 and DIW

Static leach tests were performed in both 304L stainless steel and Teflon vessels using a synthetic high-level waste glass with either deionized water (DIW) or a tuff groundwater solution as the leachant to assess the effects of the vessel and the initial leachant composition on the extent and nature of the glass reaction. The tests were performed using monolith samples at 340 m{sup {minus}1} and crushed samplesat 2000 m{sup {minus}1} for times up to 1 year. The results show less silicon is rel… more

Date: December 31, 1992

Creator: Ebert, W.L.; Bates, J.K. & Buck, E.C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Long-term corrosion behavior of environmental assessment glass

No Description Available.

Date: April 1, 1996

Creator: Ebert, W.L. & Bates, J.K.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Comparison of the Corrosion Behavior of Tank 51 Sludge-Based Glass and a Nonradioactive Homologue Glass

We are conducting static dissolution tests with a glass made at the Savannah River Technology Center (SRTC) during a demonstration of the Defense Waste Processing Facility (DWPF) process control for remote vitrification [1]. The glass was made with sludge from Tank 5 1, SRL 202 frit, and added soda. This glass is similar to waste glasses being made in the current DWPF campaign. Parallel tests are being conducted with a nonradioactive glass made at ANL having the same composition as the radioact… more

Date: December 31, 1996

Creator: Nunez, L.; Ebert, W.L.; Wolf, S.F. & Bates, J.K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Simulation of natural corrosion by vapor hydration test: seven-year results

We have investigated the alteration behavior of synthetic basalt and SRL 165 borosilicate waste glasses that had been reacted in water vapor at 70 {degrees}C for time periods up to seven years. The nature and extent of corrosion of glasses have been determined by characterizing the reacted glass surface with optical microscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive x-ray spectroscopy (EDS). Alteration in 70 {degrees}C laboratory tests … more

Date: December 31, 1996

Creator: Luo, J.S.; Ebert, W.L.; Mazer, J.J. & Bates, J.K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Laboratory testing of glasses for Lockheed Idaho Technology Company: Final report

Tests have been conducted at Argonne National Laboratory (ANL) in support of the efforts of Lockheed Idaho Technology Company (LITCO) to vitrify high-level waste calcines. Tests were conducted with three classes of LITCO glass formulations: Formula 127 (fluorine-bearing), Formula 532 (fluorine-free), and 630 series (both single- and mixed-alkali) glasses. The test matrices included, as appropriate, the Product Consistency Test Method B (PCT-B), the Materials Characterization Center Test 1 (MCC-… more

Date: June 1, 1997

Creator: Ellison, A.J.G.; Buck, E.C.; Dietz, N.L.; Ebert, W.L.; Luo, J.S.; Wolf, S.F. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

The effects of the glass surface area/solution volume ratio on glass corrosion: A critical review

This report reviews and summarizes the present state of knowledge regarding the effects of the glass surface area/solution volume (SA/V) ratio on the corrosion behavior of borosilicate waste glasses. The SA/V ratio affects the rate of glass corrosion through the extent of dilution of corrosion products released from the glass into the leachate solution: glass corrosion products are diluted more in tests conducted at low SA/V ratios than they are in tests conducted at high SA/V ratios. Differenc… more

Date: March 1, 1995

Creator: Ebert, W.L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

The release of technetium from defense waste processing facility glasses

Laboratory tests are being, conducted using two radionuclide-doped Defense Waste Processing, Facility (DWPF) glasses (referred to as SRL 13IA and SRL 202A) to characterize the effects of the glass surface area/solution volume (SN) ratio on the release and disposition of {Tc} and several actinide elements. Tests are being conducted at 90{degrees}C in a tuff ground water solution at SN ratios of 10, 2000, and 20,000 m{sup {minus}1} and have been completed through 1822 days. The formation of certa… more

Date: December 31, 1995

Creator: Ebert, W.L.; Wolf, S.F. & Bates, J.K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

SEM/EDS analysis of boron in waste glasses with ultrathin window detector and digital pulse processor

Analysis of boron in waste glasses and in the reaction products that form during the reaction of glass is important for understanding the reaction kinetics and mechanism of glass corrosion. Two borosilicate waste glasses (1.55 and 3.47 wt% B) have been analyzed by SEM/EDS. The 1.55 wt% is the lowest B concentration detected with EDS. However, the B peaks severely overlap with the C peaks due to the carbon films used for conductive layers, but this problem can be solved by subtracting the C peak… more

Date: July 1, 1996

Creator: Luo, J.S.; Wolf, S.F.; Ebert, W.L. & Bates, J.K.

Item Type: Article

Partner: UNT Libraries Government Documents Department