But i think there is a positive feedback loop.
10 plutonium cells take 1 plutonium to make
but in the plutonium reprocessing you the recipe takes 5 used cells and gives you 2 plutonium and 50% of getting u-235
That is the purpose of the plutonium cells - they allow you to "breed" more plutonium while producing power. This would be needed for a nuclear weapons program, as the mod changes the atomic bomb recipe to use plutonium