Abstract
Radiation damage to 30 vol.% TBP (Tributyl phosphate)/Kerosene solvent was investigated on the behavior changes of fission products and nitric acid in extraction and in stripping with 0.01 N nitric acid at 25°C.
In these extraction-stripping experiments, three types of solvent were used; namely, 60Co γ-ray irradiated (104-108r) solvent, non-irradiated solvent and synthetic “damaged solvent”, or DBP (Dibutyl phosphate)-MBP (Monobutyl phosphate), Butanol or Pyrophosphoric acid added TBP/Kerosene.
It has been revealed in beaker scale experiments that 95Zr-95Nb is extremely effected in extraction-stripping with radiation damaged and synthetic damaged solvent comparing with 106Ru-106Rh, 131l, 144Ce_144Pr and gross fission products, and that its behavior change depends mainly on the formation of DBP-MBP, but not on that of Butanol or Pyrophosphate.
106Ru-106Rh is hardly effected in extraction with damaged solvent and is effected only in stripping from damaged solvent.
Neither 144Ce-144Pr nor nitric acid is influenced by radiation damage to the solvent.
131l behavior change is different from others.
Emulsion formation was observed only in 95Zr-95Nb extraction with 107r or more irradiated and DBP-MBP added solvent (0.1g or more/l-solvent).
Settling time or phase separation time changes may not affect the process significantly except in the case of emulsion formation.
