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Main results obtained in France in the development of the gaseous diffusion process for uranium isotope separation; Principaux resultats obtenus en France dans les etudes sur la separation des isotopes de l'uranium par diffusion gazeuse

Abstract

The main problems which occur in the study of uranium isotope separation by the gaseous diffusion process, concern the development of the porous barrier, the corrosive nature of uranium hexafluoride and also the chemical engineering problems related to process design and the choice of best plant and stage characteristics. Porous barriers may be obtained by chemical attack of non porous media or by agglomeration of very fine powders. Examples of these two types of barriers are given. A whole set of measurement techniques were developed for barrier structure studies, to provide control and guidance of barrier production methods. Uranium hexafluoride reactivity and corrosive properties are the source of many difficult technological problems. A high degree of plant leak tightness must be achieved. This necessity creates a special problem in compressor bearing design. Barrier lifetime is affected by the corrosive properties of the gas, which may lead to a change of barrier structure with time. Barrier hexafluoride permeability measurements have helped to make a systematic study of this point. Finally an example of a plant flowsheet, showing stage types and arrangements and based on a minimisation of enriched product costs is also given as an illustration of some of the chemical  More>>
Authors:
Frejacques, C; Bilous, O; Dixmier, J; Massignon, D; Plurien, P [1] 
  1. Commissariat a l'Energie Atomique, Saclay (France). Centre d'Etudes Nucleaires
Publication Date:
Jul 01, 1958
Product Type:
Technical Report
Report Number:
CEA-R-1023
Resource Relation:
Other Information: 8 refs
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; ALUMINIUM OXIDES; CORROSION RESISTANCE; COST; DIFFUSERS; DIFFUSION BARRIERS; GASEOUS DIFFUSION PROCESS; ISOTOPE SEPARATION PLANTS; JOINTS; LEAK TESTING; MASS SPECTROMETERS; NICKEL; PERMEABILITY; POROSITY; POROUS MATERIALS; PRESSURE DEPENDENCE; PRESSURE DROP; SINTERED MATERIALS; TEFLON; URANIUM 235; URANIUM 238; URANIUM HEXAFLUORIDE; VACUUM SYSTEMS
OSTI ID:
20912740
Research Organizations:
CEA Saclay, 91 - Gif-sur-Yvette (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR07R1023073916
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
12 pages
Announcement Date:
Sep 22, 2007

Citation Formats

Frejacques, C, Bilous, O, Dixmier, J, Massignon, D, and Plurien, P. Main results obtained in France in the development of the gaseous diffusion process for uranium isotope separation; Principaux resultats obtenus en France dans les etudes sur la separation des isotopes de l'uranium par diffusion gazeuse. France: N. p., 1958. Web.
Frejacques, C, Bilous, O, Dixmier, J, Massignon, D, & Plurien, P. Main results obtained in France in the development of the gaseous diffusion process for uranium isotope separation; Principaux resultats obtenus en France dans les etudes sur la separation des isotopes de l'uranium par diffusion gazeuse. France.
Frejacques, C, Bilous, O, Dixmier, J, Massignon, D, and Plurien, P. 1958. "Main results obtained in France in the development of the gaseous diffusion process for uranium isotope separation; Principaux resultats obtenus en France dans les etudes sur la separation des isotopes de l'uranium par diffusion gazeuse." France.
@misc{etde_20912740,
title = {Main results obtained in France in the development of the gaseous diffusion process for uranium isotope separation; Principaux resultats obtenus en France dans les etudes sur la separation des isotopes de l'uranium par diffusion gazeuse}
author = {Frejacques, C, Bilous, O, Dixmier, J, Massignon, D, and Plurien, P}
abstractNote = {The main problems which occur in the study of uranium isotope separation by the gaseous diffusion process, concern the development of the porous barrier, the corrosive nature of uranium hexafluoride and also the chemical engineering problems related to process design and the choice of best plant and stage characteristics. Porous barriers may be obtained by chemical attack of non porous media or by agglomeration of very fine powders. Examples of these two types of barriers are given. A whole set of measurement techniques were developed for barrier structure studies, to provide control and guidance of barrier production methods. Uranium hexafluoride reactivity and corrosive properties are the source of many difficult technological problems. A high degree of plant leak tightness must be achieved. This necessity creates a special problem in compressor bearing design. Barrier lifetime is affected by the corrosive properties of the gas, which may lead to a change of barrier structure with time. Barrier hexafluoride permeability measurements have helped to make a systematic study of this point. Finally an example of a plant flowsheet, showing stage types and arrangements and based on a minimisation of enriched product costs is also given as an illustration of some of the chemical engineering problems present. (author) [French] Les principaux problemes qui se sont poses dans l'etude de la separation des isotopes de l'uranium par diffusion gazeuse, sont ceux relatifs a l'obtention de barrieres poreuses, ceux lies a l'utilisation de l'hexafluorure d'uranium, enfin les problemes de genie chimique relatifs au procede et a l'agencement optimum des etages et des cascades entre elles. On peut obtenir des barrieres poreuses soit par attaque de membranes pleines, soit par agglomeration de poudres de petites dimensions. Des exemples de ces deux types de barrieres seront donnes. L'etude des proprietes de texture des barrieres obtenues, necessaire pour orienter les recherches de fabrication, a conduit a adapter a ce probleme particulier une serie de methodes nouvelles. La decomposition et la corrosion par l'hexafluorure d'uranium posent les problemes technologiques les plus severes. Le premier doit etre resolu par une etancheite extremement poussee des installations, celle du compresseur etant la plus difficile a realiser. Dans le domaine de la corrosion la question la plus delicate est celle de la modification des caracteristiques de texture des barrieres du cours du temps; elle a ete etudiee systematiquement par permeametrie a l'UF{sub 6}. On donne enfin un schema de l'agencement des etages, retenu par le projet de l'usine, determine sur la base du prix de revient minimum de l'uranium enrichi. (auteur)}
place = {France}
year = {1958}
month = {Jul}
}