Download or read book Radiolysis Process Model written by and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Assessing the performance of spent (used) nuclear fuel in geological repository requires quantification of time-dependent phenomena that may influence its behavior on a time-scale up to millions of years. A high-level waste repository environment will be a dynamic redox system because of the time-dependent generation of radiolytic oxidants and reductants and the corrosion of Fe-bearing canister materials. One major difference between used fuel and natural analogues, including unirradiated UO2, is the intense radiolytic field. The radiation emitted by used fuel can produce radiolysis products in the presence of water vapor or a thin-film of water (including OH- and H- radicals, O2-, eaq, H2O2, H2, and O2) that may increase the waste form degradation rate and change radionuclide behavior. H2O2 is the dominant oxidant for spent nuclear fuel in an O2 depleted water environment, the most sensitive parameters have been identified with respect to predictions of a radiolysis model under typical conditions. As compared with the full model with about 100 reactions it was found that only 30-40 of the reactions are required to determine [H2O2] to one part in 10-5 and to preserve most of the predictions for major species. This allows a systematic approach for model simplification and offers guidance in designing experiments for validation.

Download or read book Radiolysis Process Modeling Results for Scenarios written by and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Do Statysty no Teori Procesiv Radiolizu U Vodnych Roz ynach Radioaktyvnych Elementiv Reakcijno dyfuzijna Model written by M. V. Tokarchuk and published by . This book was released on 1998 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Experimental Determination and Chemical Modelling of Radiolytic Processes at the Spent Fuel water Interface written by and published by . This book was released on 2003 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Study of Fast Processes and Transient Species by Electron Pulse Radiolysis written by J.H. Baxendale and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 639 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the lectures given at the NATO Advanced Study Institute "The Study of Fast Processes and Labile Species in Chemistry and Molecular Biology Using Ionising Radiation" held in Capri, Italy, September 7-l8th 1981. The aim of the Institute was to summarise the present position of the use of pulsed ionising radiation in chemical and biological chemical research. For background an outline of the basic radiation chemistry and physics involved and descriptions of techniques and equipment in current use was presented. It was followed by comprehensive coverage of the state of this research to date in various areas of chemistry and biological chemistry. It was hoped to demonstrate to researchers not directly involved with ionising radiation how this technique is now at a stage in its development where it can have wider applications in various branches of chemistry and biology. The fifty participants did indeed form a wide spectrum of scientific interest covering inorganic, physical and organic chemistry, molecular physics, molecular biology, radiobiology and bacteriology. They also represented a wide variety of countries viz. Belgium, China, Denmark, France, Germany, Greece, Holland, Hungary, India, Italy, Poland, Turkey, U.S.A., U.K. and Yugoslavia.

Download or read book An Introduction to Radiation Chemistry written by John William Tranter Spinks and published by Wiley-Interscience. This book was released on 1990-05-24 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text on radiation chemistry covers a number of topics, including the development of radiation chemistry, sources of high-energy radiation, dosimetry, organic materials and solids and the applications of high-energy radiation in chemical synthesis and in commercial processes.

Download or read book Experimental Determination and Chemical Modelling of Radiolytic Processes at the Spent Fuel water Interface written by and published by . This book was released on 2006 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Experimental Determination and Chemical Modelling of Radiolytic Processes at the Spent Fuel water Interface written by and published by . This book was released on 1999 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modeling of Water Radiolysis at Spallation Neutron Sources written by and published by . This book was released on 1998 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: In spallation neutron sources neutrons are produced when a beam of high-energy particles (e.g., 1 GeV protons) collides with a (water-cooled) heavy metal target such as tungsten. The resulting spallation reactions produce a complex radiation environment (which differs from typical conditions at fission and fusion reactors) leading to the radiolysis of water molecules. Most water radiolysis products are short-lived but extremely reactive. When formed in the vicinity of the target surface they can react with metal atoms, thereby contributing to target corrosion. The authors will describe the results of calculations and experiments performed at Los Alamos to determine the impact on target corrosion of water radiolysis in the spallation radiation environment. The computational methodology relies on the use of the Los Alamos radiation transport code, LAHET, to determine the radiation environment, and the AEA code, FACSIMILE, to model reaction-diffusion processes.

Download or read book Radiation Chemistry written by Farhataziz and published by . This book was released on 1987 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Study of Fast Processes and Transient Species by Electron Pulse Radiolysis written by J.H. Baxendale and published by Springer Science & Business Media. This book was released on 1982-07-31 with total page 670 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the lectures given at the NATO Advanced Study Institute "The Study of Fast Processes and Labile Species in Chemistry and Molecular Biology Using Ionising Radiation" held in Capri, Italy, September 7-l8th 1981. The aim of the Institute was to summarise the present position of the use of pulsed ionising radiation in chemical and biological chemical research. For background an outline of the basic radiation chemistry and physics involved and descriptions of techniques and equipment in current use was presented. It was followed by comprehensive coverage of the state of this research to date in various areas of chemistry and biological chemistry. It was hoped to demonstrate to researchers not directly involved with ionising radiation how this technique is now at a stage in its development where it can have wider applications in various branches of chemistry and biology. The fifty participants did indeed form a wide spectrum of scientific interest covering inorganic, physical and organic chemistry, molecular physics, molecular biology, radiobiology and bacteriology. They also represented a wide variety of countries viz. Belgium, China, Denmark, France, Germany, Greece, Holland, Hungary, India, Italy, Poland, Turkey, U.S.A., U.K. and Yugoslavia.

Download or read book Coupling the Mixed Potential and Radiolysis Models for Used Fuel Degradation written by and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary purpose of this report is to describe the strategy for coupling three process level models to produce an integrated Used Fuel Degradation Model (FDM). The FDM, which is based on fundamental chemical and physical principals, provides direct calculation of radionuclide source terms for use in repository performance assessments. The G-value for H2O2 production (Gcond) to be used in the Mixed Potential Model (MPM) (H2O2 is the only radiolytic product presently included but others will be added as appropriate) needs to account for intermediate spur reactions. The effects of these intermediate reactions on [H2O2] are accounted for in the Radiolysis Model (RM). This report details methods for applying RM calculations that encompass the effects of these fast interactions on [H2O2] as the solution composition evolves during successive MPM iterations and then represent the steady-state [H2O2] in terms of an?effective instantaneous or conditional? generation value (Gcond). It is anticipated that the value of Gcond will change slowly as the reaction progresses through several iterations of the MPM as changes in the nature of fuel surface occur. The Gcond values will be calculated with the RM either after several iterations or when concentrations of key reactants reach threshold values determined from previous sensitivity runs. Sensitivity runs with RM indicate significant changes in G-value can occur over narrow composition ranges. The objective of the mixed potential model (MPM) is to calculate the used fuel degradation rates for a wide range of disposal environments to provide the source term radionuclide release rates for generic repository concepts. The fuel degradation rate is calculated for chemical and oxidative dissolution mechanisms using mixed potential theory to account for all relevant redox reactions at the fuel surface, including those involving oxidants produced by solution radiolysis and provided by the radiolysis model (RM). The RM calculates the concentration of species generated at any specific time and location from the surface of the fuel. Several options being considered for coupling the RM and MPM are described in the report. Different options have advantages and disadvantages based on the extent of coding that would be required and the ease of use of the final product.

Download or read book Applications of Radiation Chemistry in the Fields of Industry Biotechnology and Environment written by Margherita Venturi and published by Springer. This book was released on 2017-03-06 with total page 309 pages. Available in PDF, EPUB and Kindle. Book excerpt: The series Topics in Current Chemistry Collections presents critical reviews from the journal Topics in Current Chemistry organized in topical volumes. The scope of coverage is all areas of chemical science including the interfaces with related disciplines such as biology, medicine and materials science. The goal of each thematic volume is to give the non-specialist reader, whether in academia or industry, a comprehensive insight into an area where new research is emerging which is of interest to a larger scientific audience. Each review within the volume critically surveys one aspect of that topic and places it within the context of the volume as a whole. The most significant developments of the last 5 to 10 years are presented using selected examples to illustrate the principles discussed. The coverage is not intended to be an exhaustive summary of the field or include large quantities of data, but should rather be conceptual, concentrating on the methodological thinking that will allow the non-specialist reader to understand the information presented. Contributions also offer an outlook on potential future developments in the field.

Download or read book Nuclear Corrosion Science and Engineering written by Damien Feron and published by Elsevier. This book was released on 2012-02-21 with total page 1073 pages. Available in PDF, EPUB and Kindle. Book excerpt: Corrosion of nuclear materials, i.e. the interaction between these materials and their environments, is a major issue for plant safety as well as for operation and economic competitiveness. Understanding these corrosion mechanisms, the systems and materials they affect, and the methods to accurately measure their incidence is of critical importance to the nuclear industry. Combining assessment techniques and analytical models into this understanding allows operators to predict the service life of corrosion-affected nuclear plant materials, and to apply the most appropriate maintenance and mitigation options to ensure safe long term operation.This book critically reviews the fundamental corrosion mechanisms that affect nuclear power plants and facilities. Initial sections introduce the complex field of nuclear corrosion science, with detailed chapters on the different types of both aqueous and non aqueous corrosion mechanisms and the nuclear materials susceptible to attack from them. This is complemented by reviews of monitoring and control methodologies, as well as modelling and lifetime prediction approaches. Given that corrosion is an applied science, the final sections review corrosion issues across the range of current and next-generation nuclear reactors, and across such nuclear applications as fuel reprocessing facilities, radioactive waste storage and geological disposal systems.With its distinguished editor and international team of expert contributors, Nuclear corrosion science and engineering is an invaluable reference for nuclear metallurgists, materials scientists and engineers, as well as nuclear facility operators, regulators and consultants, and researchers and academics in this field. - Comprehensively reviews the fundamental corrosion mechanisms that affect nuclear power plants and facilities - Chapters assess different types of both aqueous and non aqueous corrosion mechanisms and the nuclear materials susceptible to attack from them - Considers monitoring and control methodologies, as well as modelling and lifetime prediction approaches

Download or read book Low Temperatures and Cold Molecules written by Ian W. M. Smith and published by Imperial College Press. This book was released on 2008 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book brings together, for the first time, the results of recent research in areas ranging from the chemistry of cold interstellar clouds (10-20 K), through laboratory studies of the spectroscopy and kinetics of ions, radicals and molecules, to studies of molecules in liquid helium droplets, to attempts to create molecular (as distinct from atomic) Bose-Einstein condensates.

Download or read book Flash Photolysis and Pulse Radiolysis written by R. V. Bensasson and published by Pergamon. This book was released on 1983 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flash Photolysis and Pulse Radiolysis ...

Download or read book Model Based Signal Processing written by James V. Candy and published by John Wiley & Sons. This book was released on 2005-10-27 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt: A unique treatment of signal processing using a model-based perspective Signal processing is primarily aimed at extracting useful information, while rejecting the extraneous from noisy data. If signal levels are high, then basic techniques can be applied. However, low signal levels require using the underlying physics to correct the problem causing these low levels and extracting the desired information. Model-based signal processing incorporates the physical phenomena, measurements, and noise in the form of mathematical models to solve this problem. Not only does the approach enable signal processors to work directly in terms of the problem's physics, instrumentation, and uncertainties, but it provides far superior performance over the standard techniques. Model-based signal processing is both a modeler's as well as a signal processor's tool. Model-Based Signal Processing develops the model-based approach in a unified manner and follows it through the text in the algorithms, examples, applications, and case studies. The approach, coupled with the hierarchy of physics-based models that the author develops, including linear as well as nonlinear representations, makes it a unique contribution to the field of signal processing. The text includes parametric (e.g., autoregressive or all-pole), sinusoidal, wave-based, and state-space models as some of the model sets with its focus on how they may be used to solve signal processing problems. Special features are provided that assist readers in understanding the material and learning how to apply their new knowledge to solving real-life problems. * Unified treatment of well-known signal processing models including physics-based model sets * Simple applications demonstrate how the model-based approach works, while detailed case studies demonstrate problem solutions in their entirety from concept to model development, through simulation, application to real data, and detailed performance analysis * Summaries provided with each chapter ensure that readers understand the key points needed to move forward in the text as well as MATLAB(r) Notes that describe the key commands and toolboxes readily available to perform the algorithms discussed * References lead to more in-depth coverage of specialized topics * Problem sets test readers' knowledge and help them put their new skills into practice The author demonstrates how the basic idea of model-based signal processing is a highly effective and natural way to solve both basic as well as complex processing problems. Designed as a graduate-level text, this book is also essential reading for practicing signal-processing professionals and scientists, who will find the variety of case studies to be invaluable. An Instructor's Manual presenting detailed solutions to all the problems in the book is available from the Wiley editorial department