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Test results of volatile radionuclide evaporation from liquid lead-bismuth and their comparison with test from sodium pool

Ohno, Shuji  ; Miyahara, Shinya  ; Kurata, Yuji

Evaporation tests were conducted to investigate fundamental liquid-to-gas transfer behavior of volatile radionuclides $$^{210}$$Po, Cs, and Te in a lead-bismuth eutectic (LBE) using the "transpiration" method, which has already contributed in a Na-cooled FBR study. Since both LBE test and Na test focus on the evaporation of the same nuclides, it is possible to compare the nuclides' volatility between in LBE and in Na. This paper describes first the reviewed evaporation characteristics of fission products in Na, next the evaporation test results of fission or activation products in LBE. The importance of investigating $$^{210}$$Po evaporation is demonstrated through the estimation of vapor amount in a cover gas region of an LBE-cooled system. Furthermore, comparison is made for the volatility of Cs and Te in two kinds of coolant Na and LBE based on the test results. The accumulated data can serve as significant database utilized in liquid-metal-cooled reactor accident analysis tools.

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