Effects of alumina sources (gibbsite, boehmite, and corundum) on melting behavior of high-level radioactive waste melter feed

MRS Advances ◽  
2016 ◽  
Vol 2 (11) ◽  
pp. 603-608 ◽  
Author(s):  
SeungMin Lee ◽  
Pavel Hrma ◽  
Richard Pokorny ◽  
Jaroslav Klouzek ◽  
Bradley J. VanderVeer ◽  
...  
Keyword(s):  
Glass Production ◽  
Critical Factor ◽  
Melting Behavior ◽  
High Alumina ◽  
High Level Waste ◽  
Reaction Heat ◽  
High Level ◽  
The Relationship ◽  
Foam Thickness ◽  
Floating Layer

ABSTRACTTypes of melter feed materials affect glass production rates. This study focuses on the effects of alumina sources on melting behavior of high-alumina high-level-waste melter feeds containing different alumina sources, namely, gibbsite, boehmite, and corundum. The heat flow from the glass melt to the cold cap, a floating layer of the reacting feed, is partially hindered by a foam layer at the bottom of the cold cap. Volume expansion tests and thermoanalytical methods revealed that a slow-melting feed with corundum foamed extensively, whereas a fast-melting feed with boehmite had a low reaction heat and produced less stable foam. The foam thickness, a critical factor for the rate of melting, estimated using the relationship between the heat conductivity and foam porosity was in reasonable agreement with experimental observation.

scholarly journals Glass Formulation Development in Support of Melter Testing to Demonstrate Enhanced High Level Waste Throughput

2008 ◽  
Vol 1107 ◽  
Author(s):  
James C. Marra ◽  
Kevin M. Fox ◽  
David K. Peeler ◽  
Thomas B. Edwards ◽  
Amanda L. Youchak ◽  
...  
Keyword(s):  
Product Quality ◽  
Department Of Energy ◽  
High Alumina ◽  
High Level Waste ◽  
Alumina Concentration ◽  
Formulation Development ◽  
Technology Innovations ◽  
Glass Formulation ◽  
Waste Loading ◽  
High Level

AbstractThe U.S. Department of Energy (DOE) is currently processing high-level waste (HLW) through a Joule-heated melter (JHM) at the Savannah River Site (SRS) and plans to vitrify HLW and Low activity waste (LAW) at the Hanford Site. Over the past few years at the Defense Waste Processing Facility (DWPF), work has concentrated on increasing waste throughput. These efforts are continuing with an emphasis on high alumina concentration feeds. High alumina feeds have presented specific challenges for the JHM technology regarding the ability to increase waste loading yet still maintain product quality and adequate throughput. Alternatively, vitrification technology innovations are also being investigated as a means to increase waste throughput. The Cold Crucible Induction Melter (CCIM) technology affords the opportunity for higher vitrification process temperatures as compared to the current reference JHM technology. Higher process temperatures may allow for higher waste loading and higher melt rate.Glass formulation testing to support melter demonstration testing was recently completed. This testing was specifically aimed at high alumina concentration wastes. Glass composition/property models developed for DWPF were utilized as a guide for formulation development. Both CCIM and JHM testing will be conducted so glass formulation testing was targeted at both technologies with a goal to significantly increase waste loading and maintain melt rate without compromising product quality.

Nepheline Crystallization in High-Alumina High-Level Waste Glass

2015 ◽  
Vol 1744 ◽  
pp. 85-91 ◽  
Author(s):  
José Marcial ◽  
John McCloy ◽  
Owen Neill
Keyword(s):  
Nuclear Waste ◽  
Waste Glass ◽  
High Alumina ◽  
High Level Waste ◽  
Interfacial Conditions ◽  
Waste Vitrification ◽  
Cooling Schedules ◽  
High Level Nuclear Waste ◽  
High Level ◽  
Glass Compositions

ABSTRACTThe understanding of the crystallization of aluminosilicate phases in nuclear waste glasses is a major challenge for nuclear waste vitrification. Robust studies on the compositional dependence of nepheline formation have focused on large compositional spaces with hundreds of glass compositions. However, there are clear benefits to obtaining complete descriptions of the conditions under which crystallization occurs for specific glasses, adding to the understanding of nucleation and growth kinetics and interfacial conditions. The focus of this work was the investigation of the microstructure and composition of one simulant high-level nuclear waste glass crystallized under isothermal and continuous cooling schedules. It was observed that conditions of low undercooling, nepheline was the most abundant aluminosilicate phase. Further undercooling led to the formation of additional phases such as calcium phosphate. Nepheline composition was independent of thermal history.

A Milestone in Vitrification: The Replacement of a “Hot Metallic Crucible” With a “Cold Crucible Melter” in a Hot Cell at the La Hague Plant, France

2010 ◽  
Author(s):  
S. Robert ◽  
F. Gassot Guilbert ◽  
B. Carpentier ◽  
S. Naline ◽  
F. Gouyaud ◽  
...  
Keyword(s):  
Production Capacity ◽  
Glass Production ◽  
Plant Production ◽  
High Level Waste ◽  
Cold Crucible ◽  
Successful Operation ◽  
Ongoing Research ◽  
Processing Technologies ◽  
Main Challenge ◽  
High Level

Vitrification of high-level waste is the internationally recognized way to optimize the conditioned high level waste to be disposed of. AREVA’s successful operation of AVM at the Marcoule plant, R7 and T7 at the La Hague Plants demonstrates the capabilities and experience of the Group to deploy innovative high level waste (HLW) processing technologies in industrial facilities, in partnership with R&D (CEA) and engineering (SGN)., CEA and AREVA engineering team have continuously improved the hot metallic crucible melter vitrification technology through operational feedback as well as ongoing research and development. They have led the way in the development and implementation of Cold Crucible Induction Melter technology (CCIM). The cold crucible is a compact water-cooled melter in which the radioactive waste and the glass are molten by direct high frequency induction. This technology can handle with highly corrosive solutions and high operating temperature, which offers, among others advantages: • A great flexibility in matrix compositions, • The increase of the industrial glass production capacity, • Increase of melting temperature, • Allow higher wastes loading, • Extend to a wide and varied waste type. In order to take advantage of CCIM, a new project, called “Vitrification 2010”, was launched in 2005 with the objective to put in commercial operation a CCIM in one of the existing active R7 vitrification line in 2010. The main challenge for the project team is to replace the hot metallic crucible melter with the CCIM: • In an existing hot cell which is in operation for 20 years with high level waste solutions, • With respect to the current hot cell’s layout (calciner, through-wall for utility for example...). The paper will illustrate why this event is a major milestone in vitrification and how the “Vitrification 2010” project succeeds in record time and without any impact on the La Hague Plant production.

scholarly journals Glass Compositions and Properties of Enhanced Waste Glass with High Alumina Content for High-Level Waste

2017 ◽  
Author(s):  
Renee Russell ◽  
Yeong-Shyung Chou ◽  
Benjamin McCarthy ◽  
Lori Darnell ◽  
Vivianaluxa Gervasio ◽  
...  
Keyword(s):  
Waste Glass ◽  
Alumina Content ◽  
High Alumina ◽  
High Level Waste ◽  
High Alumina Content ◽  
High Level ◽  
Glass Compositions

Academic motivation and professional skills development in the Specialty of Social Sciences and Tourism at a public university [Motivación académica y desarrollo de competencias profesionales en la Especialidad de Ciencias Sociales y Turismo de una universidad pública]

2019 ◽  
Vol 1 (2) ◽  
pp. 96
Author(s):  
Ana Cecilia De Paz Lazaro ◽  
Jessica Luz Palomino Collantes
Keyword(s):  
Social Sciences ◽  
Academic Motivation ◽  
Public University ◽  
Skills Development ◽  
Professional Skills ◽  
Research Results ◽  
Competencias Profesionales ◽  
High Level ◽  
The Relationship

The objective of the research is to determine the relationship between academic motivation and the professional skills development in the specialty of Social Sciences and Tourism. The study is quantitative and the design is non-experimental correlational translational. The results indicate that there is a high level relationship (0.914) between the independent academic motivation variable and the professional competences development in the Specialty of Social Sciences and Tourism. In conclusion, motivation is directly related to the professional skills development in the specialty of Social Sciences and Tourism. The research results conclude that there is a high relationship between the variables.

Barriers of physical activity (kinesiophobia) in patients subjected to cardiac rehabilitation

2014 ◽  
Vol 6 (4) ◽  
Author(s):  
Janusz Kocjan ◽  
Andrzej Knapik
Keyword(s):  
Physical Activity ◽  
Cardiac Rehabilitation ◽  
Short Form ◽  
Social Activity ◽  
Self Assessment ◽  
Rehabilitation Process ◽  
Sf 36 ◽  
Polish Version ◽  
High Level ◽  
The Relationship

AbstractBackground: Comprehensive cardiac rehabilitation (CR) is a process designed to restore full physical, psychological and social activity and to reduce cardiovascular risk factors. Fear of movement may contribute to the occurrence and intensification of hypokinesia, and consequently affect the effectiveness of therapy. The aim of the study was to determine the level of barriers of physical activity in patients undergoing cardiac rehabilitation. The relationship between selected determinants (age and health selfassessment) and the kinesiophobia level were also examined.Material/Methods: 115 people aged 40-84 years were examined: 50 females (x = 63.46; SD = 11.19) and 65 males (x = 64.65; SD = 10.59) - patients undergoing cardiac rehabilitation at the Upper-Silesian Medical Centre in Katowice. In the present study, the Polish version of questionnaires: Kinesiophobia Causes Scale (KCS) and Short Form Health Survey (SF-36) were used. Questionnaires were supplemented by authors’ short survey.Results: The patients presented an elevated level of kinesiophobia, both in general as well as in individual components. In women, the kinesiophobia level was higher than in men. The psychological domain was a greater barrier of physical activity than the biological one. Strong, negative correlations of psychological and biological domains of kinesiophobia to physical functioning (SF-36) were noted in women. In the case of men, correlations were weaker, but also statistically significant.Conclusions: 1. Sex differentiates patients in their kinesiophobia level 2. Poor self-assessment of health is associated with a greater intensification of kinesiophobia 3. A high level of kinesiophobia may negatively affect cardiac rehabilitation process

Investigation of Online Learning Satisfaction During COVID 19: In Relation to Academic Achievement

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Abdul Basith ◽  
Rosmaiyadi Rosmaiyadi ◽  
Susan Neni Triani ◽  
Fitri Fitri
Keyword(s):  
Academic Achievement ◽  
Online Learning ◽  
Random Sampling ◽  
Sampling Technique ◽  
Simple Random Sampling ◽  
Research Data ◽  
Student Academic Achievement ◽  
Learning Satisfaction ◽  
High Level ◽  
The Relationship

The aim of this research is; 1) investigating the level of online learning satisfaction among students during COVID 19; 2) analyzing the influence of differences in gender, years of study, major in determining online learning satisfaction among students during COVID 19; 3) to analyze the relationship between online learning satisfaction and student academic achievement during COVID 19. The population was 656 students at STKIP Singkawang, and then a sample of 357 students (87 males and 270 females) was taken using a simple random sampling technique. The instrument in this study was adapted from Aman's Satisfaction instrument, which was then used to collect research data. Data analysis using SPSS with descriptive statistical techniques, MANOVA, and correlation. The results showed that online learning satisfaction was at a high level, meaning that students were satisfied with the online learning that had been implemented. The major differences have a significant effect on determining online learning satisfaction. Intercorrelation shows that there is a significant relationship on each indicator of online learning satisfaction with academic achievement, meaning that the higher the satisfaction felt by students in online learning, the student's academic achievement will increase.

CHALLENGES OF INTERPRETATION OF GENETIC TEST RESULTS ON THE EXAMPLE OF STUDY OF ENDURANCE

2020 ◽  
Vol 8 (1) ◽  
pp. 75-82
Author(s):  
Elmira Shamsuvaleeva ◽  
Anastasiya Nevmyvaka ◽  
Andrey Nazarenko
Keyword(s):  
Sport Activity ◽  
Computerized Testing ◽  
Daily Routine ◽  
Modern Approach ◽  
Functional Studies ◽  
Sport Training ◽  
Genetic Test Results ◽  
High Level ◽  
Biomedical Education ◽  
The Relationship

The purpose of the research is to study the possibility of predicting the development of aerobic endurance of athletes through a comparative analysis of the outcomes of genetic and computerized testing. Methods and organization of the research. In our research, we used scientific and methodological literature, as well as the outcomes of competitive activity and genetic analysis of a particular athlete. The total number of survey respondents was 158 people including athletes (n = 85) and coaches (n = 73). Results and discussion. Some authors find the relationship between the ability to develop and manifest endurance and the presence of the appropriate alleles of genes: ACE I, ACNT X, ACNT3 (RX, XX), ADRA2A, AMPDI C, PGC1A Gly, NFATC4, UCP2. Most studies reveal the relationship between the ACE gene and endurance supported by the I allele. Genetic foresight of the possibility of developing aerobic endurance of athletes can become the framework for the application of an individual approach in sport training, and contribute to the development of techniques aimed at the refinement of physical qualities. The modern approach to the coaching and competitive activities of athletes should include both genetic and functional studies of the human body. Conclusion. Sport forecast cannot be based solely on genetic testing results. The presence of polymorphisms in one or more genes associated with sport activity is the platform for good performance in a particular sport, but the actual manifestation of genetic predisposition depends on many factors. These factors include nutrition, daily routine and competent organization of the training process, which requires a high level of theoretical and practical competency of coaches in the field of biomedical education.

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