You may want to limit the [item=passive-provider-chest] chest where the [item=uranium-238,quality=legendary] is stored. This blueprint has 0.3231% efficiency, which is less efficient than the blueprint of [item=uranium-238][virtual-signal=right-arrow][item=uranium-fuel-cell][virtual-signal=right-arrow][item=depleted-uranium-fuel-cell][virtual-signal=right-arrow][item=uranium-238] which has 0.7766% efficiency. However, this blueprint is simpler and has 10x higher (and more stable) throughput.