The INL radiolysis and hydrolysis test loop has been used to evaluate the effects of hydrolytic and radiolytic degradation upon the efficacy of the TRUEX flowsheet for the recovery of trivalent actinides and lanthanides from acidic solution. The results demonstrate that solvent hydrolysis does not adversely impact the performance of the process flowsheet. The nominal composition of the TRUEX solvent used in this study is 0.2 M CMPO and 1.4 M TBP dissolved in n-dodecane. Gamma irradiation of a

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... xture of TRUEX process solvent and nitric acid in the test loop does adversely impact flowsheet performance as measured by the decreasing americium and europium distribution ratios in the extraction section as accumulated dose increases. The observed increase in americium and europium stripping distribution ratio with increasing absorbed dose indicates the radiolytic production of organic soluble degradation compounds. These organic soluble degradation products inhibit stripping of the irradiated TRUEX solvent with dilute nitric acid. Using GC, IC and HPLC, the changes in the TRUEX solvent composition were quantified. The changes in the TRUEX solvent composition correlate will with variation in the measured extraction, scrub, and strip Am and Eu distribution ratios.