Reactorcraft Mod

ReactorCraft Mod is a mod that adds realistic nuclear reactors, both fission and fusion, to Minecraft.

This mod depends on RotaryCraft – it cannot be installed without it.

Here are some of the ways in which realism is simulated:

The physics is simulated in such a way as to reflect reality, including real values for energy creation per reaction
The reactors (a large multiblock) have to be built in a way that reflects real reactors, with strategic placement of fuel rods, control rods, and other reactor core components
Realistic reactor behavior in the event of poor design, including possible meltdowns, hydrogen explosions, and radiation leakage
Realistic (though obviously simplified) control systems to manipulate control rods, feed fuel, and the like
The fuel is created realistically – including enrichment – and used realistically; users must manage things like spent fuel with spent fuel pools

ReactorCraft Mod 1

ReactorCraft Mod 2

Worldgen:

ReactorCraft does add ores out of necessity.

Fluorite: Spawns in the overworld between layers 32 and 60. Relatively common, and exists in several colors.
Pitchblende: Spawns in the end, mushroom islands, and the twilight forest. The latter two types generate between layers 8 and 24. Fairly rare.
Cadmium: Spawns in the overworld between layers 12 and 32. About as common as gold.
Indium: Spawns in the overworld between layers 0 and 16. Rare.
Silver: Spawns in the overworld between layers 16 and 40. About as common as gold. Can be disabled if other mods with their own silver are present.
Ammonium Chloride: Spawns in the nether around lava pools at layer 32. Moderately rare.
Calcite: Spawns in the overworld between layers 32 and 60. Tiny amounts spawn together, but clusters are common.
Magnetite: Spawns in the overworld between layers 60 and 128. Fairly common.

Like RotaryCraft, ReactorCraft has a craftable handbook:

ReactorCraft Mod 3