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We present the results of VLBA observations of the radio galaxy 3C317,associated with the cD galaxy UGC 09799 at the centre of the cooling corecluster of galaxies A2052. These observations were carried out at 1.7 GHz, 4.9GHz and 8.3 GHz, in polarimetric mode, and allowed us to image the parsec scaleregion of the source. Our analysis suggests that the nucleus of 3C317 hosts avery young radio source. The estimated radiative age for the radio structurewithin the inner 10 pc is $\sim$ 170 yr. Given the existence of extended radioemission on the arcsecond scale, we suggest that 3C317 is a restarted radiogalaxy. The implications of this result in the light of the interaction betweenradio plasma and thermal hot gas in clusters of galaxies are briefly discussed.Comment: 9 pages, 5 figures, accepted by A&

Radio galaxies in cooling core clusters. Renewed activity in the nucleus of 3C 317?