Download or read book Durability of Defense Waste Processing Facility Glasses Within the Purex Range of Compositions written by and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Glass Durability Along the Compositional Continuum Between a Phase Separated Frit and a Homogeneous Glass written by and published by . This book was released on 1999 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Seven non-radioactive glass compositions spanning the range of wastes to be processed in the Defense Waste Processing Facility (DWPF) were studied prior to start up of the Processing DWPF melter. These glasses were produced by Corning Glass Works and were designated Waste Compliance Plan (WCP) glasses. New glasses were melted by adding Frit 202 to the WCP-Purex glass and the resulting glass compositions were examined for amorphous phase separation using Transmission Electron Microscopy (TEM). The durability of the glasses was measured using the Product Consistency Test (PCT), ASTM C 1285-94.

Download or read book Glass Durability Along the Compositional Continuum Between a Phase Separated Frit and a Homogenous Glass written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Seven non-radioactive glass compositions spanning the range of wastes to be processed in the Defense Waste Processing Facility (DWPF) were studied prior to start up of the Processing DWPF melter. These glasses were produced by Corning Glass Works and were designated Waste Compliance Plan (WCP) glasses. New glasses were melted by adding Frit 202 to the WCP-Purex glass and the resulting glass compositions were examined for amorphous phase separation using Transmission Electron Microscopy (TEM). The durability of the glasses was measured using the Product Consistency Test (PCT), ASTM C 1285-94.

Download or read book Radioactive Waste Management written by and published by . This book was released on 1981 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Phase Stability Determinations of DWPF Waste Glasses Defense Waste Processing Facility written by and published by . This book was released on 1992 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The high-level radioactive wastes stored at Savannah River, will be immobilized in borosilicate glass in the Defense Waste Processing Facility (DWPF). Waste Acceptance Preliminary Specifications require that time-temperature-transformation (TTT) curves be provided for expected DWPF compositions, in order to predict the durability of the waste form. In order to derive these TTT curves, samples of simulated glasses are being heat treated and then analyzed. The seven simulated glasses include blend, high aluminum (HM) and high iron (Purex). X-ray diffraction show minimal crystallization for the heat treatments at 400, 1000 and 1100 C; 600 and 700 C produce the greatest amount of crystallization. Scanning electron microscopy show heterogeneous crystallization with the spinel forming on melt insolubles and the acmite nucleating on the spinel. Initial leaching results show that the glass durability decreases with increasing crystallinity for the 700 C glasses. Future plans are outlined. 2 tables, 9 refs. (DLC).

Download or read book Production and Remediation of Low sludge Simulated Purex Waste Glasses 1 written by and published by . This book was released on 1993 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Glass produced during the Purex 4 campaigns of the Integrated Defense Waste Processing Facility (DWPF) Melter System (IDMS) and the 774 Research Melter contained a lower fraction of sludge components than targeted by the Product Composition Control System (PCCS). Purex 4 glass was more durable than the benchmark (EA) glass, but less durable than most simulated SRS high-level waste glasses. Also, Purex 4 glass was considerably less durable than predicted by the algorithm which will be used to control production of DWPF glass. A melter run was performed using the 774 Research Melter to determine if the initial PCCS target composition determined for Purex 4 would produce acceptable glass whose durability could be accurately modeled by Hydration Thermodynamics. Reagent grade oxides and carbonates were added to Purex 4 melter feed stock to simulate a higher sludge loading. Each canister of glass produced was sampled and the composition, crystallinity, and durability was determined. This document details the melter operation and composition and crystallinity analyses.

Download or read book Performing a Chemical Durability Test on Radioactive High level Nuclear Waste Glass written by and published by . This book was released on 1990 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: Savannah River Site (SRS), currently is storing (approximately)30 million gallons of highly radioactive nuclear wastes. The Defense Waste Processing Facility (DWPF) nearing completion at SRS will incorporate the radionuclides in these wastes into solid borosilicate glass for final disposal in a geologic repository. Because of the variability of the wastes in the tanks, borosilicate glasses of different compositions will be produced by the DWPF during the 20--25 years required to solidify all the wastes at SRS. A chemical durability test, the Product Consistency Test (PCT), has been developed at SRS to measure the consistency of the durability of these glasses. This paper describes the remote and hands-on procedures for performing the PCT on these radioactive glasses. Results will be presented that indicate the good precision of the PCT and indicate some of the chemistry involved in leaching radioactive elements from the glass. 9 refs., 1 fig., 4 tabs.

Download or read book The Effect of Adding Crystalline Silicotitanate on the Durability Liquidus and Viscosity of Simulated High level Waste Glasses at Savannah River Site written by and published by . This book was released on 2000 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report provides a summary of the results obtained for a limited variability study for glasses containing Crystalline Silicotitanate (CST), Monosodium Titanate (MST), and either simulated Purex or HM sludge. Twenty-two glasses containing Purex sludge and three glasses containing HM sludge were fabricated and tested. The fabricated glasses were tested for durability using the 7-day Product Consistency Test (PCT) and characterized by measuring the viscosity at 1,150 C and by determining an approximate, bounding liquidus temperature. The current models used by Defense Waste Processing Facility (DWPF) for predicting durability, viscosity, and liquidus temperature were applied to all 25 glasses. The goal of this work was to identify any major problems from a glass perspective, within the scope of this effort, which could potentially preclude the use of CST at DWPF.

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1996-05 with total page 1130 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Production and Remediation of Low Sludge Simulated Purex Waste Glasses 2 written by and published by . This book was released on 1993 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Glass produced during the Purex 4 campaigns of the Integrated DWPF Melter System (IDMS) and the 774 Research Melter contained a lower fraction of sludge components than targeted by the Product Composition Control System (PCCS). Purex 4 glass was more durable than the benchmark (EA) glass, but was less durable than most other simulated SRS high-level waste glasses. Further, the measured durability of Purex 4 glass was not as well correlated with the durability predicted from the DWPF process control algorithm, probably because the algorithm was developed to predict the durability of SRS high-level waste glasses with higher sludge content than Purex 4. A melter run, designated Purex 4 Remediation, was performed using the 774 Research Melter to determine if the initial PCCS target composition determined for Purex 4 would produce acceptable glass whose durability could be accurately modeled by the DWPF glass durability algorithm. Reagent grade oxides and carbonates were added to Purex 4 melter feed stock to simulate a higher sludge loading. Each canister of glass produced was sampled and the glass durability was determined by the Product Consistency Test method. This document details the durability data and subsequent analysis.

Download or read book Effect of Melter Residence Time and Temperature on Defense Waste Processing Facility Glass Durability written by and published by . This book was released on 1994 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Environmental Issues and Waste Management Technologies in the Ceramic and Nuclear Industries written by and published by . This book was released on 2000 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt: Consists of proceedings of various symposia held during the Annual Meeting of the American Ceramic Society.

Download or read book Composition and Property Measurements for PHA Phase 4 Glasses written by and published by . This book was released on 2000 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results presented in this report are for nine Precipitate Hydrolysis Aqueous (PHA) Phase 4 glasses. Three of the glasses contained HM sludge at 22, 26, and 30 wt% respectively, 10 wt% PHA and 1.25 wt% monosodium titanate (MST), all on an oxide basis. The remaining six glasses were selected from the Phase 1 and Phase 2 studies (Purex sludge) but with an increased amount of MST. The high-end target for MST of 2.5 wt% oxide was missed in Phases 1 and 2 due to (approximately)30 wt% water content of the MST. A goal of this Phase 4 study was to determine whether this increase in titanium concentration from the MST had any impact on glass quality or processibility. Two of the glasses, pha14c and pha15c, were rebatched and melted due to apparent batching errors with pha14 and pha15. The models currently in the Defense Waste Processing Facility's (DWPF) Product Composition Control System (PCCS) were used to predict durability, homogeneity, liquidus, and viscosity for these nine glasses. All of the HM glasses and half of the Purex glasses were predicted to be phase separated, and consequently prediction of glass durability is precluded with the cument models for those glasses that failed the homogeneity constraint. If one may ignore the homogeneity constraint, the measured durabilities were within the 95% prediction limits of the model. Further efforts will be required to resolve this issue on phase separation (inhomogeneity). The liquidus model predicted unacceptable liquidus temperatures for four of the nine glasses. The approximate, bounding liquidus temperatures measured for all had upper limits of 1,000 C or less. Given the fact that liquidus temperatures were only approximated, the 30 wt% loading of Purex may be near or at the edge of acceptability for liquidus. The measured viscosities were close to the predictions of the model. For the Purex glasses, pha12c and pha15c, the measured viscosities of 28 and 23 poise, respectively, indicate that DWPF processing may be compromised at the low end of the viscosity range (20 poise). Although the HM sludge glass examined (10 wt% PHA) had a measured viscosity of (approximately)90 poise, the HM glasses at 7wt% PHA are predicted to be higher than the 100 poise limit for DWPF. Further work will be required to resolve these issues.

Download or read book Scientific Basis for Nuclear Waste Management written by and published by . This book was released on 1999 with total page 800 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Specimen animadversionum in epistolam syricacam Semeonis Beth Arsamensisde Barsauma episcopo Nisibeno deque haeresi Nestorianorum written by and published by . This book was released on 1788 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book High performance Glasses written by M. Cable and published by Blackie Academic and Professional. This book was released on 1992 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: A review of recent developments in glass technology, where advances in fabrication technology and the discovery of new glass-forming compositions have considerably expanded the applications of glasses. The contributions have been written at a level appropriate for new graduates.

Download or read book DURABILITY AND NEPHELINE CRYSTALLIZATION STUDY FOR HIGH LEVEL WASTE HLW SLUDGE BATCH 4 SB4 GLASSES FORMULATED WITH FRIT 503 written by T. Tommy Edwards and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Defense Waste Processing Facility (DWPF) is about to process High Level Waste (HLW) Sludge Batch 4 (SB4). This sludge batch is high in alumina and nepheline can crystallize readily depending on the glass composition. Large concentrations of crystallized nepheline can have an adverse effect on HLW glass durability. Several studies have been performed to study the potential for nepheline formation in SB4. The Phase 3 Nepheline Formation study of SB4 glasses examined sixteen different glasses made with four different frits. Melt rate experiments were performed by the Process Science and Engineering Section (PS & E) of the Savannah River National Laboratory (SRNL) using the four frits from the Phase 3 work, plus additional high B2O3/high Fe2O3 frits. Preliminary results from these tests showed the potential for significant improvements in melt rate for SB4 glasses using a higher B2O3-containing frit, particularly Frit 503. The main objective of this study was to investigate the durability of SB4 glasses produced with a high B2O3 frit likely to be recommended for SB4 processing. In addition, a range of waste loadings (WLs) was selected to continue to assess the effectiveness of a nepheline discriminator in predicting concentrations of nepheline crystallization that would be sufficient to influence the durability response of the glass. Five glasses were selected for this study, covering a WL range of 30 to 50 wt% in 5 wt% increments. The Frit 503 glasses were batched and melted. Specimens of each glass were heat-treated to simulate cooling along the centerline of a DWPF-type canister (ccc) to gauge the effects of thermal history on product performance. Visual observations on both quenched and ccc glasses were documented. A representative sample from each glass was submitted to the SRNL Process Science Analytical Laboratory (PSAL) for chemical analysis to confirm that the as-fabricated glasses corresponded to the defined target compositions. The Product Consistency Test (PCT, ASTM C1285) was performed in triplicate on each Frit 503 quenched and ccc glass to assess chemical durability. The experimental test matrix also included the Environmental Assessment (EA) glass and the Approved Reference Material (ARM-1) glass. Representative samples of all the ccc glasses were examined for homogeneity visually and by X-ray diffraction (XRD) analysis. Chemical composition measurements indicated that the experimental glasses were close to their target compositions. PCT results showed that all of the Fit 503 quenched glasses had an acceptable durability compared to the EA benchmark glass. The durability of one of the ccc glasses, NEPHB-04, was statistically greater than its quenched counterpart. However, this was shown to be of little practical significance, as the durability of the NEPHB-04 ccc glass was acceptable when compared to the durability of the EA benchmark glass. Visual observations and PCT results indicated that all of the Frit 503 quenched glasses were free of any crystallization that impacts durability. For the ccc glasses, XRD results indicated that the lower WL glasses (30 to 40 wt%) were amorphous, which was consistent with visual observations and PCT responses. The higher WL glasses (45 and 50 wt%) were shown by XRD to contain spinel (trevorite, NiFe2O4). It is possible that some of the other high WL glasses also contained some nepheline, but that the amount of nepheline crystallization was below the detection limit (0.5 vol%) associated with XRD. The results indicate that Frit 503 is a good candidate for SB4 processing, based on chemical durability of homogeneous and devitrified glasses over a WL range of 30 - 50%. It should be noted that the higher WL glasses would not be fit for processing in DWPF as they exceed other process related criteria (such as liquidus temperature). However, this is only one of many factors influencing the frit selection. Melt rate and the final SB4 composition are also important factors in frit selection. Additional melt rate studies are currently underway, and the final composition projection for SB4 is expected shortly.