2.3. Evaluation method
The evaluation was conducted by using Value Function (VF) and Separative Work Unit (SWU). SWU was the
scale of treatment ability of separation process, widely used in the field of nuclear power engineering (Takeda 1988).
Separation process plays a role of separate feedstock into products and wastes. So the ability of separation process
was estimated from the difference between the value of products and wastes gained by separation and the value of
feedstock. Then, Gp, Gw and Gs were used as volume flow rate per hour [L/h] (or [kg/h]) of products, wastes and
feedstock respectively, and Xp, Xw and Xf as purity [%] of products, wastes and feedstock respectively. SWU δU