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Report No.

Technology development of system chemical decontamination using iodine heptafluoride gas; Evaluation of IF$$_{7}$$ treatment condition and uranium decontamination result

Ema, Akira ; Yokoyama, Kaoru; Nakatsuka, Yoshiaki; Shimaike, Masamitsu; Sugitsue, Noritake

In the centrifugation method uranium enrichment plant, the UF$$_{6}$$ gas was supplied for a long term. The main uranium compounds are estimated to the middle fluorides UFx(4$$leqq$$x$$leqq$$=5). This middle fluoride is changed to UF$$_{6}$$ and IF$$_{5}$$ gas again by the reaction with IF$$_{7}$$. Using this reaction, the uranium compound in the plant was decontaminated. The IF$$_{7}$$ treatment tests were executed to the plant in four treatment conditions. It is necessary to clarify the relation between IF$$_{7}$$ treatment condition and decontamination results for the best treatment condition setting. Therefore, the decontamination development is evaluated using the result of the weight measurement of recovery UF$$_{6}$$ and IF$$_{5}$$ gas, the $$gamma$$-ray measurement, and the ICP-MS analysis at the IF$$_{7}$$ treatment tests. Then the technical knowledge to clarify the decontamination characteristic features is accumulated for analyzing the treatment trend, the treatment time, decontamination level and variation of the decontamination level.



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