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Transient regimes in a heavy water reactor; Regimes transitoires dans un reacteur a eau lourde

Abstract

We studied the variations of power and reactivity of a reactor when we raise in a continuous way the starting plates. During the subcritical regime (negative reactivity), the power is determined by reactivity and by the intensity of the sources of photo neutrons, produced during the previous work of the reactor. When, during the rise of the plates, the reactor, pass by the critical regime (zero reactivity), one notes that the reached power is independent of the initial reactivity. During the sur-critical regime (positive reactivity), the elevation of temperature of the uranium bars slows down the growth of reactivity due to the movements of the plates. The power stretches then toward a value that depends only on the regime of cooling of the reactor and the excess of the available reactivity. This survey permits to choose such a rise speed, that reactivity remains constantly lower to a value beyond which the piloting of the reactor becomes difficult. This result is not more valid, if the intensity of the sources is insufficient, what takes place during the first divergences and after a stop of long length. (author) [French] On etudie les variations de puissance et de reactivite d'un reacteur quand on  More>>
Authors:
Raievski, V [1] 
  1. Commissariat a l'Energie Atomique, Saclay(France). Centre d'Etudes Nucleaires
Publication Date:
Jul 01, 1953
Product Type:
Technical Report
Report Number:
CEA-R-185
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; CONTROL ELEMENTS; CRITICALITY; HEAVY WATER MODERATED REACTORS; PHOTONEUTRONS; REACTIVITY; REACTOR KINETICS; REACTOR START-UP; TEMPERATURE MONITORING
OSTI ID:
20861733
Research Organizations:
CEA Saclay, 91 (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR06R0185024705
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
12 pages
Announcement Date:
Apr 18, 2007

Citation Formats

Raievski, V. Transient regimes in a heavy water reactor; Regimes transitoires dans un reacteur a eau lourde. France: N. p., 1953. Web.
Raievski, V. Transient regimes in a heavy water reactor; Regimes transitoires dans un reacteur a eau lourde. France.
Raievski, V. 1953. "Transient regimes in a heavy water reactor; Regimes transitoires dans un reacteur a eau lourde." France.
@misc{etde_20861733,
title = {Transient regimes in a heavy water reactor; Regimes transitoires dans un reacteur a eau lourde}
author = {Raievski, V}
abstractNote = {We studied the variations of power and reactivity of a reactor when we raise in a continuous way the starting plates. During the subcritical regime (negative reactivity), the power is determined by reactivity and by the intensity of the sources of photo neutrons, produced during the previous work of the reactor. When, during the rise of the plates, the reactor, pass by the critical regime (zero reactivity), one notes that the reached power is independent of the initial reactivity. During the sur-critical regime (positive reactivity), the elevation of temperature of the uranium bars slows down the growth of reactivity due to the movements of the plates. The power stretches then toward a value that depends only on the regime of cooling of the reactor and the excess of the available reactivity. This survey permits to choose such a rise speed, that reactivity remains constantly lower to a value beyond which the piloting of the reactor becomes difficult. This result is not more valid, if the intensity of the sources is insufficient, what takes place during the first divergences and after a stop of long length. (author) [French] On etudie les variations de puissance et de reactivite d'un reacteur quand on leve d'une facon continue les plaques de demarrage. Pendant le regime subcritique (reactivite negative), la puissance est determinee par la reactivite et par l'intensite des sources de photoneutrons, produites pendant la marche anterieure du reacteur. Quand, au cours de la montee des plaques, le reacteur passe par le regime critique (reactivite nulle), on constate que la puissance atteinte est independante de la reactivite initiale. Pendant le regime surcritique (reactivite positive), l'elevation de temperature des barres d'uranium ralentit l'accroissement de reactivite due aux mouvements des plaques. La puissance tend alors vers une valeur qui ne depend plus que du regime de refroidissement du reacteur et de l'exces de la reactivite disponible. Cette etude permet de choisir une vitesse de montee telle, que la reactivite reste constamment inferieure a une valeur au dela de laquelle le pilotage du reacteur est repute difficile. Ce resultat n'est plus valable, si l'intensite des sources est insuffisante, ce qui a lieu pendant les premieres divergences et apres un arret de longue duree. (auteur)}
place = {France}
year = {1953}
month = {Jul}
}