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An experiment was conducted to investigate flow-induced vibration (FIV) in the control rods of a pressurized-water reactor (PWR). Control rods and a guide cylinder (full scale compared with the real structure) were installed on an FIV experiment platform, with which flow distributions were simulated according to actual situations. The vibration displacements of the control rods were observed in different flow rate ranges of transverse and vertical flows. Several FIV characteristics of the control rods under different transverse and vertical flows were determined by analyzing the experimental results. A formula was also proposed to predict vibration.Key words: flow-induced vibration, control rod, PWR, prediction, vertical flow, transverse flow.Nous procedons a une experience pour examiner la vibration induite par le flot (VIF) dans les tiges de controle d'un reacteur a eau pressurisee. Des tiges de controle et un cylindre guide (pleine echelle par rapport a la vraie structure) sont installes sur une plateforme experimentale, dans laquelle les distributions de flot sont simulees selon des situations reelles. Nous observons les deplacements vibrationnels des tiges de controle pour differents domaines de taux de flots transverses et verticaux. En analysant les resultats, nous determinons les caracteristiques des VIF des tiges de controle et nous proposons une formule pour predire ces vibrations. [Traduit par la Redaction]Mots-cles : dynamique des fluides, vibration induite par un flot, flot vertical, flot transverse, tige de controle., 1. IntroductionVarious flow-induced vibration (FIV) accidents have occurred since the operation of the first pressurized-water reactor (PWR) in the 1960s. Serious accidents caused by the FIV problem have elicited much [...]