It heavily uses v0.16 splitter input priority and output filtering. It also pass the output of one centrifuge into another to reduce number of items flying on the belts.
Note the mix of normal and fast belts - it is nesessary to prevent overflowing upper part with Uranium-235 (in which case belts will stuck and Uranium-238 will not be transferred on the empty half of belt). With the help of faster belt Uranium-235 have a time to overrun the loop and go to the input again, so the splitter will get the chest's uranium only when we lack it in a main loop.
Blueprint of one section
If you need 50 fuel cells every 200 seconds that 0.25 per second