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Report No.

Development of Equipment for Disposal of Contaminated Sodium (2)

Tomioka, Yutaka*; Saigusa, Moriyuki*; Nakajima, Nobuo*; Osawa, Yasutaka*

The transport behavior of trace-amount of radio nuclides such as $$^{131}$$I and $$^{137}$$Cs ($$^{134}$$Cs) in sodium have been studied on both conditions of normal sodium-steam reaction and sodium burning brought by excess steam supplying. trapping of these radio nuclides transported into gas phase in gas bubbler or scrubber, which is a component of waste gas treatment system, was also discussed. main experimental results were as follows: (1) under the normal sodium-steam reaction, partition ratio of $$^{134}$$Cs trans-ported into gas phase was 4$$times$$10$$^{-3}$$, while those of $$^{131}$$I and $$^{24}$$Na were one hundred times smaller than that of 134cs. Chemical forms of $$^{134}$$Cs and $$^{131}$$I transported into gas phase were estimated to be cesium hydroxide and inorganic iodine such as nai, respectively. (2) when the sodium burning occurred by excess steam supplying, partitionratios of $$^{24}$$Na, $$^{131}$$I increased 250$$sim$$500 times larger than those under the normal sodium-steam reaction, while for $$^{134}$$Cs, it increased about 25 times larger than that under normal reaction. sma



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