Separation Technology for Radioactive Iodine from Off-Gas Streams of Nuclear Facilities.

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Iodine separation technology using an inorganic adsorption material has been investigated in order to apply the technology to the off-gas treatment systems of nuclear facilities. Iodine removal efficiencies were checked by laboratory experiments using simulated off-gas streams of various conditions and the developed adsorbent, silver impregnated alumina (AgA). Laboratory test results demonstrated effective iodine removal with high decontamination factors (DF's) at relatively high temperatures ( ?? 100°C). Then the removal efficiency were confirmed using actual off-gas streams sampled from the dissolver off-gas treatment system of the Karlsruhe reprocessing plant. The DF's were over 10<SUP>3</SUP> with the AgA bed depth of 10 cm and showed little change during the adsorption period, which indicated applicability of the iodine removal technology with AgA to nuclear fuel reprocessing plants. Iodine adsorption capacity and its release property were also investigated using simulated off-gas streams. The former had a value of 0.22 g/g-AgA and this value could well predict the breakthrough property. The adsorbed iodine was judged stable during the storage of AgA saturated with iodine in air at temperatures below 500°C and in water at 20°C after changing the adsorbed iodine form from AgIO<SUB>3</SUB> to Agl. Thus, the separation technology provided effective and stable iodine separation from the off-gas of nuclear facilities.
一般社団法人日本原子力学会の論文

Separation Technology for Radioactive Iodine from Off-Gas Streams of Nuclear Facilities.

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