Abstract
This report describes the physical problems encountered during the EL3 pile project: choice of fuel elements, estimation of the most favourable lattice, neutron flux distribution, perturbations produced by experimental installations. In an enriched high flux pile an important factor is the production of heat in the regions outside the core, and particular attention has been given to this question. Problems of radioactivity are studied next: activity of the heavy water circuit, performance of the gaskets, activity of the air circuit, doses in the neighbourhood of the evacuation chimney. The control system is described, and the reasons which led to the choice of its characteristics; the possibility of using the neutrons absorbed by the control rods to obtain useful isotopes has been considered. Next the problem of heat transfer between the canning and the cooling fluid is studied; this problem is essential in a high-flux low-temperature pile,and to solve it experiments had to be carried out on electrically heated elements. Finally security problems are discussed, particularly the choice of the scaled container which, is the event of an accidental power surge producing a bust in the tank, would confine the activity released. The charge foreseen originally was made up of uranium
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Raievski, V
[1]
- Commissariat a l'Energie Atomique, Saclay (France).Centre d'Etudes Nucleaires
Citation Formats
Raievski, V.
The EL 3 project; Projet EL 3.
France: N. p.,
1959.
Web.
Raievski, V.
The EL 3 project; Projet EL 3.
France.
Raievski, V.
1959.
"The EL 3 project; Projet EL 3."
France.
@misc{etde_20940757,
title = {The EL 3 project; Projet EL 3}
author = {Raievski, V}
abstractNote = {This report describes the physical problems encountered during the EL3 pile project: choice of fuel elements, estimation of the most favourable lattice, neutron flux distribution, perturbations produced by experimental installations. In an enriched high flux pile an important factor is the production of heat in the regions outside the core, and particular attention has been given to this question. Problems of radioactivity are studied next: activity of the heavy water circuit, performance of the gaskets, activity of the air circuit, doses in the neighbourhood of the evacuation chimney. The control system is described, and the reasons which led to the choice of its characteristics; the possibility of using the neutrons absorbed by the control rods to obtain useful isotopes has been considered. Next the problem of heat transfer between the canning and the cooling fluid is studied; this problem is essential in a high-flux low-temperature pile,and to solve it experiments had to be carried out on electrically heated elements. Finally security problems are discussed, particularly the choice of the scaled container which, is the event of an accidental power surge producing a bust in the tank, would confine the activity released. The charge foreseen originally was made up of uranium enriched to 1.4 per cent and mixed with 5/1000 of aluminium by weight. The first charge used consisted of uranium enriched to 1.35 per cent and combined with 1.5 per cent by weight of molybdenum, which means increasing the critical masses calculated in this project. (author) [French] On decrit dans ce rapport les problemes physiques rencontres au cours du projet de la pile EL3: choix des elements combustibles, optimisation du reseau, repartition du flux de neutrons, perturbations apportees par les dispositifs experimentaux. Dans une pile enrichie, a haut flux, le degagement de chaleur dans les regions exterieures au coeur est important, on s'est particulierement attache a ce probleme. On etudie ensuite les problemes de radioactivite: activite du circuit d'eau lourde, tenue des joints, activite du circuit d'air, doses au voisinage de la cheminee d'evacuation. On decrit le dispositif de controle et les raisons qui ont conduit au choix de leurs caracteristiques, l'utilisation des neutrons absorbes par les barres de controle pour obtenir des isotopes utiles a ete envisagee. On etudie ensuite le probleme du transfert de chaleur entre la gaine et le fluide de refroidissement, ce probleme est essentiel dans une pile froide a haut flux, sa resolution a necessite des experiences sur des elements chauffes electriquement. Enfin, les problemes de securite sont evoques, en particulier le choix pendant une excursion accidentelle de la puissance provoquant une rupture de la cuve. La charge initialement prevue etait realisee avec de l'uranium enrichi a 1,4 pour cent et alliee a 5/1000 en poids d'aluminium. La premiere charge utilisee etait constituee par de l'uranium enrichi a 1,35 pour cent et alliee a 1,5 pour cent en poids de molybdene, ce qui conduit a augmenter les masses critiques calculees dans ce projet. (auteur)}
place = {France}
year = {1959}
month = {Jul}
}
title = {The EL 3 project; Projet EL 3}
author = {Raievski, V}
abstractNote = {This report describes the physical problems encountered during the EL3 pile project: choice of fuel elements, estimation of the most favourable lattice, neutron flux distribution, perturbations produced by experimental installations. In an enriched high flux pile an important factor is the production of heat in the regions outside the core, and particular attention has been given to this question. Problems of radioactivity are studied next: activity of the heavy water circuit, performance of the gaskets, activity of the air circuit, doses in the neighbourhood of the evacuation chimney. The control system is described, and the reasons which led to the choice of its characteristics; the possibility of using the neutrons absorbed by the control rods to obtain useful isotopes has been considered. Next the problem of heat transfer between the canning and the cooling fluid is studied; this problem is essential in a high-flux low-temperature pile,and to solve it experiments had to be carried out on electrically heated elements. Finally security problems are discussed, particularly the choice of the scaled container which, is the event of an accidental power surge producing a bust in the tank, would confine the activity released. The charge foreseen originally was made up of uranium enriched to 1.4 per cent and mixed with 5/1000 of aluminium by weight. The first charge used consisted of uranium enriched to 1.35 per cent and combined with 1.5 per cent by weight of molybdenum, which means increasing the critical masses calculated in this project. (author) [French] On decrit dans ce rapport les problemes physiques rencontres au cours du projet de la pile EL3: choix des elements combustibles, optimisation du reseau, repartition du flux de neutrons, perturbations apportees par les dispositifs experimentaux. Dans une pile enrichie, a haut flux, le degagement de chaleur dans les regions exterieures au coeur est important, on s'est particulierement attache a ce probleme. On etudie ensuite les problemes de radioactivite: activite du circuit d'eau lourde, tenue des joints, activite du circuit d'air, doses au voisinage de la cheminee d'evacuation. On decrit le dispositif de controle et les raisons qui ont conduit au choix de leurs caracteristiques, l'utilisation des neutrons absorbes par les barres de controle pour obtenir des isotopes utiles a ete envisagee. On etudie ensuite le probleme du transfert de chaleur entre la gaine et le fluide de refroidissement, ce probleme est essentiel dans une pile froide a haut flux, sa resolution a necessite des experiences sur des elements chauffes electriquement. Enfin, les problemes de securite sont evoques, en particulier le choix pendant une excursion accidentelle de la puissance provoquant une rupture de la cuve. La charge initialement prevue etait realisee avec de l'uranium enrichi a 1,4 pour cent et alliee a 5/1000 en poids d'aluminium. La premiere charge utilisee etait constituee par de l'uranium enrichi a 1,35 pour cent et alliee a 1,5 pour cent en poids de molybdene, ce qui conduit a augmenter les masses critiques calculees dans ce projet. (auteur)}
place = {France}
year = {1959}
month = {Jul}
}