FACTORS AFFECTING ACCURACY IN THE CALCULATION OF STEADY-STATE CONCENTRATION PROFILES IN PUREX PROCESS

This paper describes the mathematical basis of a computer model MPUMA (Modified Plutonium-Uranium-Matrix-Algorithm) . The model simulates the steady-state concentration profiles of solvent extraction contactors used in purex process, directly without giving consideration to the transient behavior. Because the change of volume of organic and aqueous phases during mass transfer is corrected and iterative error is selected reasonably, the computational accuracy of MPUMA model is higher than that of SEPHIS and PUMA models developed previously for simulating the steady-state at transient conditions.