Download or read book Contribution l tude de la r action d oxydation du neptunium pentavalent par l acide nitrique catalys e par l acide nitreux written by Jean-Paul Moulin and published by . This book was released on 1975 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: CINETIQUE DE L'OXYDATION ETUDIEE PAR UNE METHODE UTILISANT DES SOLVANTS, SANS EXTRACTION LIQUIDE LIQUIDE: REACTION DU 1ER ORDRE PAR RAPPORT A HNO::(2) QUAND SA CONCENTRATION EST INFERIEURE A CELLE DE NP(V) ET DU 1ER ORDRE PAR RAPPORT A NP(V) DANS LE CAS INVERSE. INFLUENCE DE LA TEMPERATURE ET DES IONS H**(+) ET NO::(3)**(-): ILS ONT TOUS DEUX UN EFFET ACCELERATEUR

Download or read book Etude des r actions d oxydation de l uranium IV et du plutonium III en milieu aqueux nitrique et organique tri n butylphosphate 30 n dod cane written by Olivier Guigou and published by . This book was released on 2004 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: Le procédé PUREX utilisé pour le traitement des combustibles nucléaires usés est basé sur une série de réactions rédox couplées aux différences d’extraction des actinides par le tri-n-butylphosphate (TBP). L’existence d’espèces oxydantes (notamment HNO2) dans le système biphasique est responsable d’une instabilité thermodynamique de l’uranium(IV) et du plutonium(III).L’objectif principal de ces travaux de thèse est de consolider les connaissances de la chimie rédox de U et Pu dans les milieux aqueux (acide nitrique) et organique (TBP30%/n-dodécane). Les paramètres expérimentaux requis pour obtenir des données exploitables cinétiquement sont définis.En milieu aqueux nitrique et organique, l’oxydation de U(IV) par HNO2 est régie par un mécanisme autocatalytique pour lequel la production d’acide nitreux est proportionnelle à la quantité d’U(IV) oxydée.La variation des concentrations d’acide nitreux au cours de la réaction limite largement le nombre de données exploitables. Il a néanmoins été vérifié, en milieu aqueux, une augmentation des vitesses avec les concentrations d’U(IV), d’acide nitreux et de nitrate ; une diminution est obtenue avec l’augmentation de l’acidité du milieu. Il est proposé, en milieu organique, des conditions expérimentales favorables à l’obtention des résultats exploitables.L’étude de Pu(III) en milieu organique nitrique a permis l’instabilité de cette espèce à température ambiante. Sa stabilisation requiert des conditions spécifiques (expérimentalement et chimiquement). Les acquisitions expérimentales permettent de vérifier le caractère autocatalytique de l’oxydation de Pu(III), et l’influence prépondérante des concentrations initiales de Pu(III)

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 Fundamentals of Electrochemical Corrosion written by Ele Eugene Stansbury and published by ASM International. This book was released on 2000-01-01 with total page 487 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covering the essential aspects of the corrosion behavior of metals in aqueous environments, this book is designed with the flexibility needed for use in courses for upper-level undergraduate and graduate students, for concentrated courses in industry, for individual study, and as a reference book.

Download or read book The Nuclear Fuel Cycle written by P. D. Wilson and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: