Published 1966
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The diffusion coefficient as a function of energy for usual moderators
- 1. Commissariat a l'Energie Atomique, Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France)
Description
After a review of the definition of the energy function to be taken for the diffusion coefficient used in calculations of reactor cells, in the elementary theory of diffusion, various possible approximations of this function are given. These approximations are shown to be accurate enough for practical uses. Methods for the direct calculations of these approximations for the currently used 'normal' models (methods avoiding the calculation of differential cross sections) are described; these methods are applied to several usual moderators at various temperatures (according to different models. (authors)
Availability note (English)
Available from INIS in electronic formAbstract (French)
On rappelle la definition de la fonction de l'energie que l'on doit prendre pour le coefficient de diffusion dans les calculs de cellule de reacteur en theorie elementaire de la diffusion. Puis on indique diverses approximations possibles de cette fonction. On montre que ces approximations ont en pratique une precision suffisante. Enfin on decrit des methodes de calcul direct de ces approximations pour les modeles 'normaux' couramment employes (methodes qui evitent d'avoir a calculer les sections efficaces differentielles), et on les applique a plusieurs thermaliseurs usuels a differentes temperatures (selon differents modeles). (auteurs)Files
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Additional details
Additional titles
- Original title (French)
- Le coefficient de diffusion en fonction de l'energie des thermaliseurs usuels
Publishing Information
- Imprint Pagination
- [48 p.]
- Report number
- CEA-R--3010
INIS
- Country of Publication
- France
- Country of Input or Organization
- France
- INIS RN
- 35044266
- Subject category
- S22: GENERAL STUDIES OF NUCLEAR REACTORS;
- Descriptors DEI
- ACCURACY; CALCULATION METHODS; DIFFERENTIAL CROSS SECTIONS; FICK LAWS; GRAPHITE; HEAVY WATER; NEUTRON DIFFUSION EQUATION; NEUTRON SLOWING-DOWN THEORY; REACTOR CELLS; TEMPERATURE DEPENDENCE; THERMALIZATION
- Descriptors DEC
- CARBON; CROSS SECTIONS; DEUTERIUM COMPOUNDS; DIFFERENTIAL EQUATIONS; DIFFUSION EQUATIONS; ELEMENTS; EQUATIONS; HYDROGEN COMPOUNDS; MINERALS; NONMETALS; OXYGEN COMPOUNDS; PARTIAL DIFFERENTIAL EQUATIONS; SLOWING-DOWN; WATER
Optional Information
- Notes
- 18 refs.