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Design, fabrication, and installation of a unit to demonstrate pyrolysis-incineration of simulated alpha wastes are described. The main reactor in the unit is a cylinder 7 ft long, lined with refractory in the lower 5 exp 1 / sub 2 ft to give an effective inside diameter of about 11 in. Four experimental runs, using simulated alpha wastes, were completed. Average processing rates of 27 lb/hr were achieved. The waste components were shredded to an average size of 4 in. The ash content of the simulated waste was 3.6 wt percent. The composition of the off-gas from the process was determined using a gas chromatograph. Condensates (or tars) were collected during a 12-hr run and totaled 18 percent of the weight of the simulated feed that was processed. These tars had a calorific heating value of 9380 cal/g and a viscosity of 750 cp at 50 exp 0 C. Ash content of these tars was 0.3 wt percent. Ash collected during a 12-hr run appeared dark gray in color and had a bulk tap density of 0.76 g/cm exp 3 . The ash was found to contain 13 wt percent unburned carbon. This unburned material represents 0.5 wt percent of the waste treated in the process. For this particular waste composition and ash content, the volume reduction factor was 140.