[en] A remote process for removing radioactive sludge from underground waste tanks was demonstrated. Long-shafted centrifugal pumps circulated liquid waste within the tank to suspend the sludge, and the resulting slurry was pumped from the tank. Over 98% of the sludge was removed, while only 1.4 volumes water per volume sludge was added to waste inventory. Cleaning results were determined by remote wide-angle photographic and periscopic inspections. Demonstration data are being used to design facilities for waste removal from an additional 22 SRP waste tanks