[en] The 1978 tank inspection program was completed with inspections through all 158 accessible annulus risers on the double-wall tanks using at least one photographic technique at each riser. No unusual conditions were noted. Inspections were begun on tanks 25 to 28 which are in the late stages of construction; they will be completed during 1979. Eleven waste tank interior inspections were made with all conditions appearing normal. All three photographic techniques were used to record the progress of the tank 16 annulus cleaning demonstration (TA 2-850) and the tank 16 sludge removal demonstration (TA 2-943). An improved periscope with a black and white TV system was used during the sludge removal demonstration. Wall thickness measurements were made in three annulus risers; no general corrosion was discovered. Approximately 4,000 photographs were taken in 1978; 25% of them were of tank 16