TY - RPRT TI - Periodic transients linked to a variation in reactivity; Transitoires de periode lies a une variation de reactivite AB - We study here the influence of the transient, linked to a variation in reactivity, on the measurement of the period, this measurement being made from the logarithmic differential of the power and being defined by 1/T 1/p(dp/dt). We show that the adjustment of the thresholds of period safety is often incompatible with the velocities of liberation of reactivity. A compromise is then necessary between the speed of response of the periodimeter and the speed with which the reactivity is liberated. This makes it necessary to have rapid security devices for the power levels in the piles in which the speeds of liberation of the reactivity are high. (author) [French] On etudie ici l'influence du transitoire lie a une variation de la reactivite sur la mesure de la periode, cette mesure etant faite a partir de la derivee logarithmique de la puissance et etant definie par 1/T 1/p(dp/dt). On montre que le reglage des seuils de securite periode est souvent incompatible avec les vitesses de liberation de reactivite. Il y a alors un compromis a faire entre la vitesse de reponse du periodemetre et la vitesse de liberation de reactivite. Ceci impose de disposer de securites rapides sur les niveaux de puissance, dans les piles ou les vitesses de liberation de reactivite sont importantes. (auteur) AU - "Furet, J" AU - "Weil, J [Commissariat a l'Energie Atomique, Saclay (France). Centre d'Etudes Nucleaires]" KW - "21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS" KW - "CONTROL ELEMENTS" KW - "CRITICALITY" KW - "DELAYED NEUTRONS" KW - "ONE-GROUP THEORY" KW - "REACTIVITY" KW - "REACTOR KINETICS" KW - "REACTOR PERIOD" KW - "ROD DROP ACCIDENTS" KW - "ROD DROP METHOD" KW - "TIME DEPENDENCE" KW - "TRANSIENTS" KW - "TRITON REACTOR" KW - "VARIATIONS" DO - https://doi.org/ UR - https://www.osti.gov/etdeweb/servlets/purl/20972224 PB - CY - France PY - 1961 DA - 1961-07-01 LA - French J2 - [] VL - C1 - CEA Saclay, 91 - Gif-sur-Yvette (France) C2 - C3 - CEA-R-1950 C4 - C5 - Available from INIS in electronic form L3 - Other Information: 6 refs ER -