The Soviet Volvograd ship repair yard Krasno 264 according to a CIA report dated September 1967

A item reported the fenced and road served Soviet Volvograd ship repair yard Krasno 264 with as geographic coordinates 48.32.00 north and 44.40.00 east near the south border of Volvograd on the west bank of the Volga. The shipyard possessed a side-haul marine railway with 3 transverse slipways, 2 shop and 8 support buildings.

Source
The report was published on www.archive.org, document number CIA-RDP78T04759A007300010035-9