The 114 meter long, 3504 dwt freighter Ataman went aground while passing through the Bosporus.   The Coastal Safety at Instanbul sent out a rescue tug and pilot, but the master of the Ataman refused assistance.  The vessel was attempting to free itself by its own power.   The Ataman did not have a local pilot on board for the crossing of the Bosporus heading towards the Black Sea.   No reports of injuries or pollution being released.