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THE USE OF LOW REACTION DISLODGING TOOLS FOR WASTE RETRIEVAL FROM UNDERGROUND STORAGE TANKS

The recovery of highly radioactive waste from underground storage poses significant problems, which vary from location to location with both material stored and tank configuration. Three possible solutions to this retrieval problem illustrate the different approaches which must be adopted for the storage tanks at Hanford, Idaho National Engineering Laboratory, and Oak Ridge National Laboratory. The first must produce up to 30 gpm of mixed waste. A mining strategy to make use of a dual head end effector with a jet pump to extract the resulting fluid is described. At Idaho the walls of this tank support a series of cooling coils which limit access. A lighter arm is to be used on this site, with limited strength. Initial experiments to clean around the piping and infrastructure are described. At Oak Ridge the arm has an intermediate capacity. The tool must clean the waste from the gunite walls of the tank without damage, although the jets must have sufficient power to fragment any gunite which has fallen from the walls. The results of the tests to validate the design are described.