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The radioactive waste incinerator at Tokai Research Establishment, JAERI was installed in 1966, and has been operated routinely for seven years. In the operation, a lot of inadequate parts of the incinerator such as furnace, spray scrubber, cyclone, and electrostatic precipitator have been improved.This experimental program was carried out to examine the decontaminability of furnace and exhaust-gas system. The decontamination factors (DF) of the incinerator components were determined by obtaining the ratio of activity of 32P in the influent gas to that in the effluent gas. DF of 3.6×10 in the spray scrubber and 7.0×10 in the electrostatic precipitator were obtained. Retention factor in the furnace was 2.3×10. Using the value of 1.0×102 in the cloth filter and 1.0×103 in the HEPA filter obtained in the previous examination (in 1966), the over-all DF of the incinerator was calculated to be 6×109.Also the distribution of radioactive material in each part of incinerator was 93% in the ash, 5% in the spray scrub solution, 0.5% in the electostatic precipitator, 0.02% in the cloth filter and 0.3% in the duct of exhaust-gas.
日本保健物理学会の論文