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Theoretical, physical and experimental study of fissile aqueous media; Etudes theorique, physique et experimentale des milieux fissiles aqueux

Abstract

This thesis consists of a set of theoretical and experimental studies. a) Theoretical calculation methods used for cross-sections and the critical parameters; b) Comparison of the theoretical and experimental results: it is shown that the agreement between these results cannot be improved above a certain limit because of the accuracy with which are known the composition and the dimensions of the media and the microscopic cross-sections; c) Determination of the ratios {eta}{sup 9}-bar / {eta}{sup 5}-bar, {eta}{sup 3}-bar / {eta}{sup 5}-bar for fissile aqueous media ({eta}-bar: number of neutrons emitted per neutron absorbed, averaged over the reactor neutron spectrum). Evaluation of the accuracy to which these ratios are known; d) Effect of {sup 240}Pu: the measurements are carried out on Pu with a {sup 240}Pu content of 1.5 per cent, 3.11 per cent and 9.95 per cent; Calculation of the resonance integral I240 using the experimental results gives values in reasonable agreement with the results obtained by other more conventional methods. e) Measurement of the spectrum indices for aqueous media containing Pu, U5 and U3. With these latter it is possible to obtain mean fission cross-section ratios {sigma}f239-bar / {sigma}f235-bar for these different spectra. A calculation-experiment comparison is carried out  More>>
Authors:
Caizergues, R [1] 
  1. Commissariat a l'Energie Atomique, Saclay (France). Centre d'Etudes Nucleaires
Publication Date:
Apr 01, 1969
Product Type:
Thesis/Dissertation
Report Number:
CEA-R-3650
Resource Relation:
Other Information: TH: These docteur ES sciences appliquees; 65 refs; PBD: Apr 1969
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; ACCURACY; AQUEOUS SOLUTIONS; CALCULATION METHODS; COMPARATIVE EVALUATIONS; CROSS SECTIONS; EXPERIMENTAL DATA; FISSILE MATERIALS; PLUTONIUM 240; RESONANCE INTEGRALS
OSTI ID:
20528680
Research Organizations:
CEA Saclay, 91 - Gif-sur-Yvette (France); Paris-11 Univ., Faculte des Sciences d'Orsay, 91 - Orsay (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR04R3650094946
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
[200] pages
Announcement Date:

Citation Formats

Caizergues, R. Theoretical, physical and experimental study of fissile aqueous media; Etudes theorique, physique et experimentale des milieux fissiles aqueux. France: N. p., 1969. Web.
Caizergues, R. Theoretical, physical and experimental study of fissile aqueous media; Etudes theorique, physique et experimentale des milieux fissiles aqueux. France.
Caizergues, R. 1969. "Theoretical, physical and experimental study of fissile aqueous media; Etudes theorique, physique et experimentale des milieux fissiles aqueux." France.
@misc{etde_20528680,
title = {Theoretical, physical and experimental study of fissile aqueous media; Etudes theorique, physique et experimentale des milieux fissiles aqueux}
author = {Caizergues, R}
abstractNote = {This thesis consists of a set of theoretical and experimental studies. a) Theoretical calculation methods used for cross-sections and the critical parameters; b) Comparison of the theoretical and experimental results: it is shown that the agreement between these results cannot be improved above a certain limit because of the accuracy with which are known the composition and the dimensions of the media and the microscopic cross-sections; c) Determination of the ratios {eta}{sup 9}-bar / {eta}{sup 5}-bar, {eta}{sup 3}-bar / {eta}{sup 5}-bar for fissile aqueous media ({eta}-bar: number of neutrons emitted per neutron absorbed, averaged over the reactor neutron spectrum). Evaluation of the accuracy to which these ratios are known; d) Effect of {sup 240}Pu: the measurements are carried out on Pu with a {sup 240}Pu content of 1.5 per cent, 3.11 per cent and 9.95 per cent; Calculation of the resonance integral I240 using the experimental results gives values in reasonable agreement with the results obtained by other more conventional methods. e) Measurement of the spectrum indices for aqueous media containing Pu, U5 and U3. With these latter it is possible to obtain mean fission cross-section ratios {sigma}f239-bar / {sigma}f235-bar for these different spectra. A calculation-experiment comparison is carried out using various theoretical methods. (author) [French] Cette these groupe un ensemble d'etudes theoriques et experimentales. a) Methodes theoriques de calcul utilisees pour les sections efficaces et les parametres critiques; b) Comparaisons des resultats theoriques et experimentaux: on montre que l'accord entre ces resultats ne peut etre ameliore au-dela de certaines limites vu la precision avec laquelle sont connues la composition et les dimensions des milieux et les sections efficaces macroscopiques; c) Determination des rapports {eta}{sup 9}-bar / {eta}{sup 5}-bar, {eta}{sup 3}-bar / {eta}{sup 5}-bar pour les milieux fissiles aqueux ({eta}: nombre de neutrons emis par neutron absorbe moyenne sur Le spectre de neutrons du reacteur) - Evaluation de la precision avec laquelle sont connus ces rapports; d) Effet du Pu240: les mesures sont faites sur du Pu a teneurs en Pu240 egales a 1.5 pour cent, 3.11 pour cent et 9.95 pour cent; Un calcul de l'integrale de resonance I240 a partir des resultats experimentaux donne des valeurs en accord raisonnable avec les resultats obtenus par d'autres methodes plus classiques. e) Mesures d'indices de spectre sur les milieux aqueux contenant Pu, U5 et U3. Celles-ci permettent d'obtenir les rapports des sections efficaces moyennes de fission {sigma}f239-bar / {sigma}f235-bar sur ces differents spectres. Une comparaison calculs-experience est faite au moyen de diverses methodes theoriques. (auteur)}
place = {France}
year = {1969}
month = {Apr}
}