This report is a step-by-step guide for the Accelerated Leach Test (ALT) Computer Program developed to accompany a new leach test for solidified waste forms. The program is designed to be used as a tool for performing the calculations necessary to analyze...

This report summarizes the work performed for the Accelerated Leach Test(s) Program at Brookhaven National Laboratory in Fiscal Year 1985 under the sponsorship of the US Department of Energy's Low-Level Waste Management Program (LLWMP). Programmatic activ...

In FY 1989, a draft accelerated leach test for solidified waste was written. Combined test conditions that accelerate leaching were validated through experimental and modeling efforts. A computer program was developed that calculates test results and ...

... Accession Number : AD0801595. Title : RELAY, LEACH TYPE 9220 PM, 4 PDT VIBRATION, ACCELERATION, AND SHOCK TESTS,. ...

... PERFORMANCE(ENGINEERING)), VIBRATION, ACCELERATION, SHOCK(MECHANICS), ENVIRONMENTAL TESTS, COILS, ELECTRIC RELAYS ...

... and a proprietary calcium chromate pigment for use ... Descriptors : *ALUMINUM, *PAINTS, *PIGMENTS, *PAINT PRIMERS, *PLASTIC PAINTS, TEST ...

A computerized data base of LLW leaching data has been developed. Long-term tests on portland cement, bitumen and vinyl ester-styrene (VES) polymer waste forms containing simulated wastes are underway which are designed to identify and evaluate factors that accelerate leaching without changing the mechanisms.

The value of glass surface area to solution volume ratio (SA/V) can strongly influence the leaching rate of PNL 76-68 glass. The leaching rate is largely governed by silicon solubility constraints. Silicic acid in solution reduced the elemental release of all glass components. No components are leached to depths greater than that of ...

An accelerated leach test(s) is being developed to predict long-term leaching behavior of low-level radioactive waste (LLW) forms in their disposal environments. As necessary background, a literature survey of reported leaching mechanisms, available mathematical models and factors that affect ...

Factors that accelerate leaching from solidified low-level radioactive waste are being investigated to develop a short-term leach test that can be used to predict long-term releases. Data from work with portland cement containing radioactive tracers indicate that elevated temperatures can ...

This report documents the development of a computerized data base (db) of leaching data for solidified low-level radioactive waste (LLW) forms. Brookhaven National Lab performed this work under contract with the US Department of Energy's Low-Level Waste Management Program as part of an effort to develop an accelerated leach ...

An accelerated leach test method has been developed to determine the maximum leachability of solidified waste. The approach we have taken is to use a semi-dynamic leach test; that is, the leachant is sampled and replaced periodically. Parameters such as temperature, leachant volume, and ...

A computerized data base of low-level waste (LLW) leaching data is being compiled by Brookhaven National Laboratory. Although this data base is being compiled as part of an effort to develop accelerated leach test procedures for LLW forms, others involved in LLW management may find it useful. The data base is ...

The leaching mechanisms of simulated low-level radioactive waste forms are being determined as support for development of an accelerated leach test. Two approaches are being used: (1) comparisons of leaching data with results of a model that describes diffusion from a finite cylinder, and (2) ...

This report is a step-by-step guide for the Accelerated Leach Test (ALT) Computer Program developed to accompany a new leach test for solidified waste forms. The program is designed to be used as a tool for performing the calculations necessary to analyze leach ...

In a radioactive waste disposal, concrete containment structures must be studied over extended periods during which it is necessary to account for a possible degradation by calcium leaching due to on-site water. An experimental investigation is described where the effects of an accelerated calcium leaching process of concrete on creep ...

Investigations are reported on reducing cesium and strontium leachability from products formed at the cementation of intermediatelevel waste solutions from reprocessing plants. The leach tests used were the IAEA method and an accelerated test. One particu...

A leach test is described and applied to municipal incinerator fly ash (10%) stabilized in Portland cement. The test differs from previous tests mainly by bubbling CO{sub 2} through the leachant, which itself is periodically renewed. An advantage of the test is that pH remains nearly constant ...

Control of waste glass durability is a major concern in the immobilization of radioactive and mixed wastes. Leaching rate in standardized laboratory tests is being used as a demonstration of consistency of the response of waste glasses in the final disposal environment. The leaching of silicate and borosilicate glasses containing ...

Control of waste glass durability is a major concern in the immobilization of radioactive and mixed wastes. Leaching rate in standardized laboratory tests is being used as a demonstration of consistency of the response of waste glasses in the final disposal environment. The leaching of silicate and borosilicate glasses containing ...

This report summarizes the work performed for the Accelerated Leach Test(s) Program at Brookhaven National Laboratory in Fiscal Year 1985 under the sponsorship of the US Department of Energy's Low-Level Waste Management Program (LLWMP). Programmatic activities were concentrated in three areas, as listed and described in the ...

An accelerated leach test for low-level radioactive waste forms is being developed to provide, in a short time, data that can be extrapolated to long time periods. The approach is to provide experimental conditions that will accelerate leaching without changing the dominant release mechanism. ...

Chemical durability results obtained by tests on crushed samples and bottle surfaces on a variety of commercial glass-bottle compositions show the difficulties encountered in attempting to correlate accelerated tests with the actural performance of the bottles toward various solutions under service conditions. The results obtained thus ...

A modified IAEA leach test was used to evaluate the relative performance of potential saltstone formulations. The effects of sample size and leach rates for specific ions were determined. Nitrite, nitrate, sodium, and sulfate are listed in order of decreasing leach rates and effective diffusivities for saturated ...

A comparison of three leaching tests was performed with fourteen industrial wastes to evaluate the potential of each test for use as a standard leaching test. The study was done in conjunction with a background study on the development of a standard leaching ...

There is an increasing concern about the emission of pollutants during the construction and lifetime of buildings. The leaching of concrete admixtures containing thiocyanate and resin acids was studied using standard leaching tests and chemical analysis. Ecotoxicological risk was assessed for each admixture. Thiocyanate ...

Examples of data from IAEA leach tests on spent fuel elements are shown that were displayed, not in the recommended manner in the IAEA leach test, but in the manner of the modifications of this leach test. The main difference in the display methods is in the plotting of ...

A comparison of three leaching tests was performed with thirteen industrial wastes to evaluate the potential of each test for use as a standard leaching test procedure. Such a procedure would be used to assess the leaching characteristics of industrial wastes for land ...

Pacific Northwest National Laboratory (PNNL) has been tasked by Bechtel National Inc. (BNI) on the River Protection Project-Hanford Tank Waste Treatment and Immobilization Plant (RPP-WTP) project to perform research and development activities to resolve technical issues identified for the Pretreatment Facility (PTF). The Pretreatment Engineering Platform (PEP) was designed and constructed and is ...

Throughout the utilization of recycled materials, weathering factors such as humidity, gas composition and temperature have the potential to change the material properties and enhance the release of inorganic contaminants. In this research, the effects of weathering factors on recycled gravel materials for roadbeds were evaluated by applying three kinds of accelerating ...

Throughout the utilization of recycled materials, weathering factors such as humidity, gas composition and temperature have the potential to change the material properties and enhance the release of inorganic contaminants. In this research, the effects of weathering factors on recycled gravel materials for roadbeds were evaluated by applying three kinds of accelerating ...

The prediction of long-term leachability of low-level radioactive waste forms is an essential element of disposal-site performance assessment. This report describes experiments and modeling techniques used to develop an accelerated leach test that meets this need. The acceleration in leaching ...

Pacific Northwest National Laboratory (PNNL) has been tasked by Bechtel National Inc. (BNI) on the River Protection Project-Waste Treatment Plant (RPP-WTP) project to perform research and development activities to resolve technical issues identified for the Pretreatment Facility (PTF). The Pretreatment Engineering Platform (PEP) was designed, constructed, and operated as part of a plan to respond ...

The phenomenological behavior of commercial silicate glasses and nuclear borosilicate glasses in confined glass:aqueous solution systems is similar. For commercial silicate glasses the behavior has been described, ''If the neutral solution is unbuffered and confined in a bottle, it becomes alkaline and attack is accelerated, but eventually the accumulated ...

Pacific Northwest National Laboratory (PNNL) has been tasked by Bechtel National Inc. (BNI) on the River Protection Project-Hanford Tank Waste Treatment and Immobilization Plant (RPP-WTP) project to perform research and development activities to resolve technical issues identified for the Pretreatment Facility (PTF). The Pretreatment Engineering Platform (PEP) was designed, constructed, and ...

The long-term performance of glasses developed for stabilizing Hanford low-level radioactive waste is being assessed using static leach tests conducted for up to one year and under conditions that accelerate corrosion. These tests support development of d...

Leaching studies of MCC 76-68 glass in synthetic brines high in NaCl were performed from 50 to 150/sup 0/C and included interactive testing with ductile iron and titanium. Hydrolysis of the glass matrix was generally slower in saturated brines than in deionized water, due to a lower solubility of silica in the brines. Inclusion of ductile iron in the ...

This paper presents an overview of leach test methods and of factors that affect leaching of nuclear waste solids. Some of the analytical requirements are discussed. (ERA citation 06:035210)

A standard leach test must permit accumulation of sufficient data to determine material parameters, such as figures of merit (FOMs) in a short time. Leach test results should be extended to other sizes, longer times, other temperatures, and other leaching solutions. This paper provides insights ...

In this work, a study of the leaching kinetics of Cs(+) ions from cement paste solids, containing inactive Cs(2)SO(4), is presented, involving (i) the parallel performance of leaching experiments at two temperatures (30 degrees C and 70 degrees C); (ii) the performance of leaching tests with intermediate changes in ...

Reuse of industrial aggregates is still hindered by concern for their long-term properties. This paper proposes a laboratory method for accelerated ageing of steel slag, to predict environmental and technical properties, starting from fresh slag. Ageing processes in a 10-year old asphalt road with steel slag of electric arc furnace (EAF) type in the subbase were identified by ...

Disposal of low-level radioactive waste by immobilization in cement is being evaluated worldwide. The stability of cement in the environment may be impaired by sulfur-oxidizing bacteria that corrode the cement by producing sulfuric acid. Since this process is so slow that it is not possible to perform studies of the degradation kinetics and to test cement mixtures with ...

Wide variations were found in the rate of chemical and microbiological leaching of iron from pyritic materials from various sources. Thiobacillus ferrooxidans accelerated leaching of iron from all of the pyritic materials tested in shake flask suspensions at loadings of 0.4% (wt/vol) pulp density. The most ...

Since thorium phosphate diphosphate (?-TPD) can be considered as a potential host specific matrix for the long-term storage of actinides in the field of an underground repository, it is necessary to study the irradiation effects on the chemical durability of this material. In this aim, leaching tests were realized on pre-irradiated thorium uranium ...

Testing Summary Pacific Northwest National Laboratory (PNNL) has been tasked by Bechtel National Inc. (BNI) on the River Protection Project-Hanford Tank Waste Treatment and Immobilization Plant (RPP-WTP) project to perform research and development activities to resolve technical issues identified for the Pretreatment Facility (PTF). The Pretreatment Engineering Platform (PEP) ...

A number of pellets and highly durable glasses prepared from nonradioactive-simulated high-level waste calcines have been leach tested. The leach tests are patterned on the IAEA standard test and the proposed Materials Characterization Center tests. Most ...

A number of pellets and highly durable glasses prepared from nonradioactive-simulated high-level wasste calcines have been leach tested. The leach tests are patterned on the IAEA standard test and the proposed Materials Characterization Center tests. Most...

This study assessed chromium leaching from silicone foam-encapsulated salt waste, using a surrogate formulated after Department of Energy complex mixed waste. Two commercial formulations of silicone foam (Wacker ELEKTROGUARD 2100 and General Electric RTV-664) were evaluated as a function of waste load (28--48 wt%). Chromium leaching was formulation ...

Pacific Northwest National Laboratory (PNNL) has been tasked by Bechtel National Inc. (BNI) on the River Protection Project-Hanford Tank Waste Treatment and Immobilization Plant (RPP-WTP) project to perform research and development activities to resolve technical issues identified for the Pretreatment Facility (PTF). The Pretreatment Engineering Platform (PEP) was designed, constructed and ...

Pacific Northwest National Laboratory (PNNL) has been tasked by Bechtel National Inc. (BNI) on the River Protection Project-Hanford Tank Waste Treatment and Immobilization Plant (RPP-WTP) project to perform research and development activities to resolve technical issues identified for the Pretreatment Facility (PTF). The Pretreatment Engineering Platform (PEP) was designed, constructed and ...

The efficient remediation of heavy metal-bearing sediment has been one of top priorities of ecosystem protection. Cement-based solidification/stabilization (s/s) is an option for reducing the mobility of heavy metals in the sediment and the subsequent hazard for human beings and animals. This work uses sodium carbonate as an internal carbon source of accelerated carbonation ...

Regulatory test procedures currently applied in the USA and Canada (EP Toxicity Test and the Toxicity Characteristic Leaching Procedure), Germany (leach test procedure DIN 38414 S4), France (leach test X 31-210), Switzerland (leach ...

The principal objective of the research summarized in this report was to develop a leaching test which could be used widely to assess the leaching characteristics of industrial wastes. Detailed investigations were made regarding the best general type of test, and the test variabl...

This report documents results from a variety of activities requested by the Hanford Tank Waste Treatment and Immobilization Plant (WTP). The activities related to caustic leaching, oxidative leaching, permeate precipitation behavior of waste as well as chromium (Cr) leaching are: � Model Input Boehmite Leaching ...

Borosilicate glass containing radioactive wastes from the Savannah River Plant have been leached for 900 days. The International Standards Organization's (ISO) static leach test procedure was used on glass buttons in various leachants. Leach rates based o...

This report describes the results of ammonia leaching studies on sulfide and native copper ores of Michigan. Tests were performed on pure minerals to determine the kinetics of leaching and on ore samples to determine leaching rates, reagent losses, and di...

A series of glass/metal leaching experiments have been conducted to evaluate the effects of potential metal canister and metal overpack materials on the durability of SRP waste glass. A modified leaching test, based upon standard MCC-1 leaching procedures...

The report describes testwork aimed at the removal of cobalt and nickel from COMAT leach liquors by the use of a laboratory-scale solvent-extraction apparatus. These leach liquors are pregnant liquors from the leaching, with sulphuric acid and oxygen, of ...

Research and development on the SYNROC concept for high level radioactive waste fixation commenced at the Australian Atomic Energy Commission Research Establishment, Lucas Heights, in March 1979, in collaboration with a complementary program at The Australian National University (ANU). The present paper reports progress in the project's second year and reviews its current status. An ...

A solid waste is classified as hazardous if it contains sufficient leachable components to contaminate the groundwater and the environment if disposed in a landfill. Scale, sludge and drilling mud from three geothermal fields (Bulalo, Phlippines; Cerro Prieto, Mexico; and Dixie Valley, USA) containing regulated elements at levels above the earth�s crustal abundance were studied for their ...

Alteration phases, found on the leached surfaces and present as colloids in the leachates of 200-based frit (fully active and simulated) nuclear waste glass, reacted under static test conditions, at a surface area to leachate volume ratio of 20,000 m{sup {minus}1} for 15 days to 728 days, have been examined by analytical electron microscopy. The ...

Dokdo consists of small volcanic islands located in the southern part of the East Sea. Accelerated weathering tests was performed to examine the physico-mechanical characteristics of volcanic rocks in Dokdo. Rock core specimens of trachyandesite, andesitic dyke and ash tuff were prepared, and double soxhlet extractors(DSE) and peristatic pumps were used ...

In this study, the release of metals and metalloids from full-scale portland cement concrete pavements containing coal combustion products (CCPs) was evaluated by laboratory leaching tests and accelerated loading of full-scale pavement sections under well-controlled conditions. An equivalent of 20 years of highway traffic loading was ...

This report evaluates the leaching of oxoanions and other materials from mineral processing wastes, using the TCLP test as well as several other alternative leaching tests (Generalized Acid Neutralization Capacity (GANC), Constant pH 5.0 Leaching Test, Co...

... a nEW PROcESS FOR THE ACCELERATION TEST AND EVALUATION OF AEROMEDICAL EQUIPMENT FOR ... acceleration Testing ...

The enclosed report documents six New Waste Calcining Facility (NWCF) HEPA filter leaching trials conducted at the Idaho Chemical Processing Plant using a filter leaching system to validate the filter leaching treatment concept. The test results show that a modified filter leaching system will ...