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Some particular aspects of control in nuclear power reactors; Quelques aspects particuliers du controle dans les piles atomiques de puissance

Abstract

There are still many problems in the field of measurement and control of neutron flux. The present studies in connexion with high flux reactors contribute to the solution of these problems which concern specialists in reactor control. The present state of this investigation and the results of different studies carried out in France by the C A and the EDF are pointed out: A - In the nuclear instrumentation field, work is at present devoted to the technologies used to develop detectors and cables, which have to work at high temperature and in a high {gamma} background; fast electronic techniques are applied to fission counters to measure low neutron fluxes in a high {gamma} background (10 Rh). B - In the control and safety field, there is a real need for studies on the behaviour of reactors in the subcritical state. This increases the margin of security during restarts when poison effects must be overcome The perturbations due to control rod movements necessitate a new organisation of power level safety and control assemblies, in connexion with thermal or activation measurements. Two methods of fast start-up are described. They are related to the fission rate measurement as a function of time.  More>>
Authors:
Furet, J; [1]  Pupponi, J [2] 
  1. Commissariat a l'Energie Atomique, Saclay (France). Centre d'Etudes Nucleaires
  2. Electricite de France (EDF), 75 - Paris (France)
Publication Date:
Jul 01, 1964
Product Type:
Technical Report
Report Number:
CEA-R-2656
Resource Relation:
Other Information: 20 refs
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; CONTROL ELEMENTS; CRITICALITY; EVALUATION; POWER REACTORS; REACTOR INSTRUMENTATION; REACTOR SAFETY; RESEARCH PROGRAMS
OSTI ID:
20668350
Research Organizations:
CEA Saclay, 91 - Gif-sur-Yvette (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR05R2656107051
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
22 pages
Announcement Date:
Dec 14, 2005

Citation Formats

Furet, J, and Pupponi, J. Some particular aspects of control in nuclear power reactors; Quelques aspects particuliers du controle dans les piles atomiques de puissance. France: N. p., 1964. Web.
Furet, J, & Pupponi, J. Some particular aspects of control in nuclear power reactors; Quelques aspects particuliers du controle dans les piles atomiques de puissance. France.
Furet, J, and Pupponi, J. 1964. "Some particular aspects of control in nuclear power reactors; Quelques aspects particuliers du controle dans les piles atomiques de puissance." France.
@misc{etde_20668350,
title = {Some particular aspects of control in nuclear power reactors; Quelques aspects particuliers du controle dans les piles atomiques de puissance}
author = {Furet, J, and Pupponi, J}
abstractNote = {There are still many problems in the field of measurement and control of neutron flux. The present studies in connexion with high flux reactors contribute to the solution of these problems which concern specialists in reactor control. The present state of this investigation and the results of different studies carried out in France by the C A and the EDF are pointed out: A - In the nuclear instrumentation field, work is at present devoted to the technologies used to develop detectors and cables, which have to work at high temperature and in a high {gamma} background; fast electronic techniques are applied to fission counters to measure low neutron fluxes in a high {gamma} background (10 Rh). B - In the control and safety field, there is a real need for studies on the behaviour of reactors in the subcritical state. This increases the margin of security during restarts when poison effects must be overcome The perturbations due to control rod movements necessitate a new organisation of power level safety and control assemblies, in connexion with thermal or activation measurements. Two methods of fast start-up are described. They are related to the fission rate measurement as a function of time. This is done either continuously by a constant and high reactivity change, or step by step. The application of automatic techniques to detector motion seems to give the answer to control and safety in normal start-up. C - The scope of these studies covers the methods used for the control of E.D.F. 3, which are described. (authors) [French] La mesure et le controle du flux neutronique dans les piles de puissance posent encore de nombreux problemes. Les etudes actuellement entreprises dans le domaine des piles a haut flux, doivent apporter une contribution importante a la solution de ces problemes qui interessent les specialistes du controle des piles de puissance. On analyse l'etat actuel de ces etudes et on donne les resultats des differents travaux effectues en France, dans les differents laboratoires du Commissariat a l'Energie Atomique et de l'Electricite de France. A - Dans le domaine de l'instrumentation, ces etudes portent actuellement sur les technologies utilisees pour le developpement des detecteurs et cables susceptibles de fonctionner a haute temperature; sous rayonnement {gamma} eleve - et sur les techniques d'electronique rapide appliquees aux chambres a fissions qui permettent de faire des mesures de flux neutronique sous rayonnement {gamma} eleve (105 R/h). B - Dans le domaine general du controle et de la securite, les difficultes de redemarrage liees aux empoisonnements par les produits de fission conduisent a des etudes approfondies sur le comportement du reacteur en regime sous-critique. Les perturbations apportees aux mesures neutroniques par le mouvement des barres de controle necessitent une nouvelle organisation des chaines de mesure et de securite neutronique faisant intervenir au niveau de puissance des parametres correcteurs tels que: puissance thermique, temperature, activation Azote 16. En ce qui concerne les demarrages rapides, deux methodes nouvelles sont decrites liees essentiellement a la mesure du taux de fissions en fonction du temps, soit dans le cas d'une liberation continue a vitesse constante et elevee de reactivite, soit dans le cas d'une liberation de reactivite par paliers. Par ailleurs, l'application des techniques de deplacement automatique des detecteurs dans le cas des demarrages normaux semblent apporter une solution rationnelle au controle et a la securite. C - Dans le cadre des techniques ci-dessus, on decrit les dispositifs retenus pour la mesure et le controle de la puissance de la pile EDF III. (auteurs)}
place = {France}
year = {1964}
month = {Jul}
}