NuclearCraft

Name: NuclearCraft
Author: tomdodd4598

NuclearCraft is a Forge technology mod for 1.12.2 that adds nuclear engineering, from fission reactors to fusion machines.

ForgeClient and serverMIT LicenseOpen source1.12.2

What it does

Reactors, heat exchangers, steam turbines and tokamak fusion reactors are built as multiblock structures, so each machine is assembled from several blocks before it runs. The fuel system covers many fuel types, and fusion uses several fuel combinations. Recipes can be changed with CraftTweaker, and JEI is fully supported for browsing them.

The project's source code, issue tracker and wiki are public. The license is MIT, and the code is open source. Files are published for Forge only, with 2.19a for 1.12.2 as the latest build, dated 2025-05-26. A server running it needs every connecting player to have it too. NuclearCraft Steam Additions requires it.

Key features

Fission reactors
Fission reactors are built as multiblock structures that run fuel to produce power and heat.
Heat exchangers and turbines
Multiblock heat exchangers and steam turbines turn reactor heat into usable steam and power.
Tokamak fusion reactors
Large multiblock tokamak reactors run fusion, with several fuel combinations available.
Fuel system
A large set of fuel types covers both fission and fusion, each with its own use in the machines.
Recipe scripting
CraftTweaker support lets pack makers add or change recipes, and JEI shows them in game.

Compatibility

Latest build for each game version and loader.

1.12.22.19a

ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

Required by 1 mod

NuclearCraft Steam Additions1.12.2

How it compares

Full comparison

GTICompat is open source under the GNU General Public License v3.0 only, published for Forge 1.12.2 and run on client and server. Immersive Technology is also open source and GPL v3.0 only, with Forge files for 1.12.2 – 1.20.1 on client and server. Dea's Fission is not open source, uses All rights reserved, and is published for 1.20.1.

Mod	Loaders	Game versions	Environment	Updated
NuclearCraft	Forge	1.12.2	Client and server	2025-05-26
GTICompat	Forge	1.12.2	Client and server	2026-01-08
Immersive Technology	Forge	1.12.2 – 1.20.1	Client and server	2026-10-07
Dea's Fission	Forge	1.20.1	Client and server	2025-11-03

Questions

Does NuclearCraft need a helper mod to run?

No required dependency is listed for Forge. The mod is published for Forge only, so a Forge install for 1.12.2 is required.

Does NuclearCraft have to be installed on the server?

Yes. Servers that run it need every player to install it too.

In the catalog

NuclearCraft is one of 8,499 Technology mods on ModsFinder, and one of 4,122 Technology mods for Forge. 2,920 mods support Minecraft 1.12.2.