Promethea Nuclear Complex

The Promethea Nuclear Complex is a nuclear materials mining, processing, and assembly facility located to the north of Ejecta in the Hiyama mountain range. It is the best surviving facility into the post-collapse era, and has been virtually unaffected by both the impact and collapse of the human colony. It is almost entirely self-sufficient and completely autonomous, as necessitated by the high radiation levels.

The facility contains 9 fission reactors, 3 for power and 6 as breeder reactors. Uranium ore is mined deep below the mountain, then brought to the surface where it is processed into highly-enriched fuel rods. The reactors would produce a high amount of tritium gas, which would be stored in tanks deep within the mountain. Tritium has a half life of 12.3 years, and decays into stable helium-3. This helium-3 would be isolated from the tritium, then sent to the colony to be used as fusion reactor fuel.

To mitigate supply issues arising from the fact that helium-3 was primarily acquired as a radioactive decay product, enormous quantities of tritium had to be produced and stored.

The facility was also designed to produce nuclear weapons, ranging from low-yield terrestrial deployments (5-140kt), to ultra-high-yield exoatmospheric asteroid redirection weapons, which can be in the excess of hundreds of megatons.

The largest weapon ever produced was an asteroid redirecting 533Mt thermonuclear Casaba-howitzer. Its construction consumed virtually all of Promethea's available fissile material at the time, and its projected yield was so large that ARES demanded it to only be assembled beyond Selene orbit, rather than on the ground like all other weapons had. It is believed that had the weapon detonated on the surface, it would have released more energy than the asteroid impact did.