Evaporation behavior of 2LiF–BeF2–ZrF4 molten salt with irradiated nuclear fuel
2021
The evaporation behaviours of various components were investigated by using a low pressure distillation method in a 2LiF–BeF2–ZrF4 mixture containing irradiated ThF4 and UF4. The experiment showed that BeF2 and ZrF4 were found to mainly condensate at the outer cover, the coolest zone, and their relative volatilities vs. LiF were 9.8 and 32.2, respectively, while for ThF4 and UF4, at four different temperature zones the values were almost constant, at 0.1 and 0.3. The radioactivity of various nuclides was further detected using gamma spectrometer analysis. 137Cs was hardly observed due to long half-time decay. 233Pa was found to co-evaporate with the carrier salt, while 239Np mainly remained in the residual salt as 237U. In different temperature zones, the decontamination factors of rare earth in receiver salts ranged from 10 to 103. On the basis of the investigation, it was proposed that the distribution of various nuclides after distillation, may be helpful to design the feasible condensate system to recover the carried salt in a molten salt reactor.
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