Uranium-238

U-238 is the most common Uranium isotope in the game. It makes up ~91.6% of natural NTM Uranium.

Production
No elements or isotopes when bombarded in a Breeding Reactor turn into U-238, it is primarily obtainable via the Gas Centrifuge.

Small amounts can be extracted by reprocessing spent Thorium Fuel and some kinds of RBMK waste.

Uses
It is primarily used to make Uranium and MOX fuel.

It can also be used to make weak Uranium Radioisotope Thermoelectric Generator Fuel Pellets, which are slightly weaker than Plutonium-238 ones. They provide 5 power per tick. If RTG decay is enabled, each will have a lifespan of 720,000,000 ticks, computing to somewhat over 1 IRL year, with a stated in-game lifespan of 150 years (assuming a 100 day year). They decay to Lead pellets. This also means it will make 3,600,000,000 power in total over that time. They're slightly better than pure Pu-238 ones because they're cheaper but only make half the power.

It is also used in a multitude of Depleted Uranium coated weapons to increase damage and penetration power.

It also has an interesting use in the Titanium Filter for the Watz Power Plant.

It breeds into Reactor Grade Plutonium.

First tier of Self-Charging Batteries, rather weak at 5 HE/tick.

It can be used in the Custom Nuke. It contributes a 1.1 multiplier to its nuclear stage, which is slightly higher than unenriched uranium.