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NuclearCraft Reactor Builder

An automated reactor builder for NuclearCraft!
by sonar_sonic
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446,911 downloads
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Updated Jun 30, 2026
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NuclearCraft Reactor Builder

This mod accepts NuclearCraft Reactor Designs and builds them for you, it accepts both NCPF & JSON.

Features:

  • Works for Underhaul & Overhaul 
  • Automated Building & Destroying
  • Automated filter setting for Fuel Cells/Vessels and Neutron Irradiators.
  • Automated casing building
  • Can automatically fix reactors after meltdowns.
  • Can build reactors of any size.
  • Hologram to show the build area
  • 3D Render Preview + Layer Preview page
  • Configurable casing (Glass / Solid / Edges)
  • Required components page.
  • Config for Speed / Energy Consumption.
  • Highlights blocks which are blocking the builder
  • Creative Reactor Builder
  • Casing components: automatic neutron source/controller/port placement
  • All addons supported in Thiz's reactor planner are supported

Supported Reactors:

  • Underhaul SFR [NCPF Coming soon]
  • Overhaul SFR
  • Overhaul MSR [Coming soon]
  • Overhaul Turbine

Supported Files:

  • Thiz Reactor Planner: NCPF [WIP, Partially supported]
  • Hellrage Reactor Planner: JSON

Planned Features:

  • Rotating reactors

Modpacks:

Feel free to use this in as many packs as you wish!

How to use

1) Copy a NCPF/JSON file in your file explorer.

2) Click Paste File in the builder's gui

3) Put the required components in a chest or inventory placed above the builder

4) Give the builder some energy

5) Click Build Reactor in the builder's gui

Example setup:

Screenshots:

NC-ReactorBuilder-1.12.2-1.1.0a.jar
MC Forge, 1.12.2
Beta 2025-06-13 Get

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