  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 core
cluster of galaxies A2052. These observations were carried out at 1.7 GHz, 4.9
GHz and 8.3 GHz, in polarimetric mode, and allowed us to image the parsec scale
region of the source. Our analysis suggests that the nucleus of 3C317 hosts a
very young radio source. The estimated radiative age for the radio structure
within the inner 10 pc is $\sim$ 170 yr. Given the existence of extended radio
emission on the arcsecond scale, we suggest that 3C317 is a restarted radio
galaxy. The implications of this result in the light of the interaction between
radio plasma and thermal hot gas in clusters of galaxies are briefly discussed.
