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Reactor G1: high power experiments; Experiences a forte puissance

Abstract

The experiments carried out in the starting-up programme of the reactor G1 comprised a series of tests at high power, which allowed the following points to be studied: 1- Effect of poisoning by Xenon (absolute value, evolution). 2- Temperature coefficients of the uranium and graphite for a temperature distribution corresponding to heating by fission. 3- Effect of the pressure (due to the coiling system) on the reactivity. 4- Calibration of the security rods as a function of their position in the pile (1). 5- Temperature distribution of the graphite, the sheathing, the uranium and the air leaving the canals, in a pile running normally at high power. 6- Neutron flux distribution in a pile running normally at high power. 7- Determination of the power by nuclear and thermodynamic methods. These experiments have been carried out under two very different pile conditions. From the 1. to the 15. of August 1956, a series of power increases, followed by periods of stabilisation, were induced in a pile containing uranium only, in 457 canals, amounting to about 34 tons of fuel. A knowledge of the efficiency of the control rods in such a pile has made it possible to measure with good accuracy  More>>
Authors:
Laage, F de; Teste du Baillet, A; Veyssiere, A; Wanner, G; [1]  Retel, H [2] 
  1. Commissariat a l'Energie Atomique, Saclay (France). Centre d'Etudes Nucleaires
  2. Societe Rateau, D.E.A. (France)
Publication Date:
Jul 01, 1957
Product Type:
Technical Report
Report Number:
CEA-R-670-M
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; ACCURACY; AIR FLOW; CONTROL ELEMENTS; FUEL CANS; FUEL CHANNELS; G-1 REACTOR; GRAPHITE; HETEROGENEOUS REACTOR CORES; NEUTRON FLUX; PRESSURE DEPENDENCE; REACTIVITY; REACTOR COOLING SYSTEMS; REACTOR LATTICE PARAMETERS; REACTOR START-UP; TEMPERATURE COEFFICIENT; TEMPERATURE DISTRIBUTION; THERMOCOUPLES; THORIUM; URANIUM; XENON OSCILLATIONS
OSTI ID:
20889974
Research Organizations:
CEA Saclay, 91 - Gif-sur-Yvette (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR07RM670054593
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
36 pages
Announcement Date:
Aug 10, 2007

Citation Formats

Laage, F de, Teste du Baillet, A, Veyssiere, A, Wanner, G, and Retel, H. Reactor G1: high power experiments; Experiences a forte puissance. France: N. p., 1957. Web.
Laage, F de, Teste du Baillet, A, Veyssiere, A, Wanner, G, & Retel, H. Reactor G1: high power experiments; Experiences a forte puissance. France.
Laage, F de, Teste du Baillet, A, Veyssiere, A, Wanner, G, and Retel, H. 1957. "Reactor G1: high power experiments; Experiences a forte puissance." France.
@misc{etde_20889974,
title = {Reactor G1: high power experiments; Experiences a forte puissance}
author = {Laage, F de, Teste du Baillet, A, Veyssiere, A, Wanner, G, and Retel, H}
abstractNote = {The experiments carried out in the starting-up programme of the reactor G1 comprised a series of tests at high power, which allowed the following points to be studied: 1- Effect of poisoning by Xenon (absolute value, evolution). 2- Temperature coefficients of the uranium and graphite for a temperature distribution corresponding to heating by fission. 3- Effect of the pressure (due to the coiling system) on the reactivity. 4- Calibration of the security rods as a function of their position in the pile (1). 5- Temperature distribution of the graphite, the sheathing, the uranium and the air leaving the canals, in a pile running normally at high power. 6- Neutron flux distribution in a pile running normally at high power. 7- Determination of the power by nuclear and thermodynamic methods. These experiments have been carried out under two very different pile conditions. From the 1. to the 15. of August 1956, a series of power increases, followed by periods of stabilisation, were induced in a pile containing uranium only, in 457 canals, amounting to about 34 tons of fuel. A knowledge of the efficiency of the control rods in such a pile has made it possible to measure with good accuracy the principal effects at high temperatures, that is, to deal with points 1, 2, 3, 5. Flux charts giving information on the variations of the material Laplacian and extrapolation lengths in the reflector have been drawn up. Finally the thermodynamic power has been measured under good conditions, in spite of some installation difficulties. On September 16, the pile had its final charge of 100 tons. All the canals were loaded, 1,234 with uranium and 53 (i.e. exactly 4 per cent of the total number) with thorium uniformly distributed in a square lattice of 100 cm side. Since technical difficulties prevented the calibration of the control rods, the measurements were limited to the determination of the thermodynamic power and the temperature distributions (points 5 and 7). This report will therefore comprise four distinct parts: 1- 34 T. pile. Study of principal effects at high temperatures. Measurement of power. 2- 100 T. pile. Measurement of power. Thermodynamic study. Temperature distribution. 3- 34 T. pile. Flux charts at high temperatures. 4- Brief study of the cooling system. Experimental installation. (1) See report on reheating. (author) [French] Les experiences effectuees dans le cadre du programme de demarrage du reacteur G1, ont comporte une serie d'essais a forte puissance, qui ont permis d'etudier les points suivants: 1- Effet d'empoisonnement par le Xenon (valeur absolue, evolution). 2- Coefficients de temperature de l'uranium et du graphite pour une distribution des temperatures correspondant a l'echauffement par fission. 3- Effet de pression (d au soufflage) sur la reactivite. 4- Etalonnage des barres de securite en fonction de leur position dans la pile (1). 5- Distribution des temperatures du graphite, des gaines, de l'uranium et de l'air a la sortie des canaux, dans la pile en regime stable a puissance elevee. 6- Distribution du flux de neutrons dans la pile en regime stable a puissance elevee. 7- Determination de la puissance par methode nucleaire et thermodynamique. Ces experiences ont ete faits sur deux etats de pile tres differents. Du 1 au 15 aout 1956, une serie de montees en puissances et de stabilisations ont ete faites sur une pile a uranium seul, chargee a 457 canaux, soit environ 34 tonnes de combustible. La connaissance de l'efficacite des barres de controle sur une telle pile a permis de mesurer avec une bonne precision les principaux effets a chaud, c'est-a-dire de repondre aux points 1, 2, 3, 5. Des cartes de flux donnant des renseignements sur les variations du laplacien matiere et des longueurs d'extrapolation dans le reflecteur ont ete dressees. Enfin la puissance thermodynamique a ete mesuree dans de bonnes conditions, en depit de quelques difficultes d'appareillage. Le 16 septembre, la pile est a son chargement definitif de 100 tonnes. Tous les canaux de l'empilement sont charges, dont 1234 en uranium et 53 (soit exactement 4 % du nombre total) en thorium uniformement reparti suivant un reseau carre de pas 100 cm. Des ennuis techniques n'ayant pas permis la calibration des barres de contr e, les mesures ont ete limitees a la determination de la puissance thermodynamique et les distributions de temperature (points 5 et 7). Ce rapport sera forme par consequent de quatre parties distinctes. 1- Pile de 34 T. Etude des principaux effets a chaud. Mesure de puissance. 2- Pile de 100 T. Mesure de puissance. Etude thermodynamique. Distribution des temperatures. 3- Pile de 34 T. Cartes de flux a chaud. 4- Etude sommaire du circuit de refroidissement. Appareillage experimental. (1) Cf. rapport sur le rechauffage. (auteur)}
place = {France}
year = {1957}
month = {Jul}
}