Method for determining degassing constant of xenon in liquid sodium.

概要

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A method for determining the xenon degassing constant from liquid sodium to the cover gas by measuring the 135Xe and 135mXe release rate ratios, which were produced by the decay of 135I in liquid sodium, was investigated using the Toshiba inpile fission product loop. Release rate ratios of 135Xe to 135mXe showed values of 9.97.6 at a sodium temperature range of 240390°C and degassing constant of 1.2× 10-32.6×10-3 sec-1, which correspond to degassing half-life of 9.74.4 min, were obtained. This method is found to be effective for the determination of fission gas degassing constant, which has a corresponding half-life between several minutes to 40 min and will be useful for the study of fission gas transport phenomena in liquid sodium systems.
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