Bigger Reactors - All The Guides (2024)

Reactors are the primary multi-block of Bigger Reactors. Loosely inspired by the real-life RBMK design, reactors may be used as either a power generator (in Passive mode) or as a heat source (in Active mode). Reactors consume and produce various Fuel and Waste products, and are highly customizable.

As of Bigger Reactors 0.5.2, the smallest possible reactor size is 3 × 3 × 3. With the default config, reactors may be built as large as 128 × 128 × 192, however this may be changed to an absolute maximum of 192 × 192 × 256.



The following components are the bare minimum required to construct any type of reactor.

  • Reactor Terminals: are the heart of your reactor.
  • Reactor Casings: make up the frame and walls of your reactor.
  • Fuel Rods: are where Fuel and Waste are contained.
  • Control Rods: are used to maintain control over the reaction.
  • Access Ports: are used to insert Fuel and extract Waste.


Certain components may only be used with a specific type of reactor, and cannot be used together in the same reactor.

The first type of reactor are Passive Reactors. These output the energy they generate directly as RF, which may be used by other machines.

  • Power Taps are where you extract power from a passive reactor.
    The second type of reactor are Active Reactors. These convert the energy they generate into heat, which is used to heat up fluids.
  • Coolant Ports are used to insert “cold” fluids (such as water) and extract “hot” fluids (such as steam).
  • Coolant Manifolds are used to increase the surface area for heat transfer.


Some components are entirely optional and are not required to build a functioning reactor. These may, however, allow for automation and remote control of reactors.

  • Redstone Ports allow for control of various reactor functions via Redstone circuits.
  • Computer Ports allow for control of various reactor functions via Lua scripting. This requires a computers mod such as CC: Tweaked to be installed.
  • Reactor Glass functions identically to casings, but may only be used on walls. It allows you to see inside of the reactor.


Reactor Moderators (commonly incorrectly referred to as Reactor Coolants) are materials placed inside of a Reactor during construction. When a reactor is in operation, a moderator may change the way the reactor performs depending its properties.

Moderators have four main properties that affect the reactor simulation:

  • Absorption: The speed at which radiation is absorbed and converted to case heat.
  • Efficiency: How efficiently absorbed radiation is converted into heat.
  • Moderation: The effectiveness at which radiation is moderated (“softened”).
  • Conductivity: How well heat is transferred from the fuel rods to the reactor casing.

In general, higher values are always better (except for absorption, which may be better or worse depending on your reactor design). For a more in-depth explanation on how to use the information here, see the simulation page.

Something to note is that Modpack authors have the ability to add or modify moderators. For an accurate list of supported blocks/fluids, use Just Enough Items (JEI) by checking the uses for the Reactor Terminal (currently broken on multiplayer).

Moderator Properties

The values listed below are accurate for Bigger Reactors 0.5.2, for Minecraft 1.16.5. Also correct for 0.6.x (1.17-1.19)

ID Absorption Efficiency Moderation Conductivity
astralsorcery:liquid_starlight 0.85 0.8 2.0 3.0
biggerreactors:ludicrite_block 0.6 0.87 3 3
bloodmagic:life_essence_block 0.7 0.55 1.75 2.5
mekanism:ethene 0.37 0.65 1.9 1.5
mekanism:hydrofluoric_acid 0.6 0.45 1.4 2.5
mekanism:hydrogen 0.2 0.3 1.2 0.1
mekanism:hydrogen_chloride 0.31 0.65 1.7 1
mekanism:lithium 0.7 0.6 1.04 0.7
mekanism:oxygen 0.01 0.35 1.04 0.1
mekanism:sodium 0.23 0.6 1.7 1
mekanism:steam 0.33 0.5 1.33 0.5
mekanismgenerators:deuterium 0.03 0.3 1.07 0.1
minecraft:air 0.1 0.25 1.1 0.05
minecraft:cave_air 0.1 0.25 1.1 0.05
minecraft:glass 0.2 0.25 1.1 0.3
minecraft:ice 0.33 0.33 1.15 0.1
minecraft:snow_block 0.15 0.33 1.05 0.05
minecraft:void_air 0.1 0.25 1.1 0.05
minecraft:water 0.33 0.5 1.33 0.1
minecraft:lava 0.33 0.33 1.15 0.7
forge:storage_blocks/allthemodium 0.66 0.9 3.5 3.5
forge:storage_blocks/aluminum 0.5 0.78 1.42 0.6
forge:storage_blocks/bronze 0.51 0.77 1.41 1
forge:storage_blocks/copper 0.5 0.75 1.4 1
forge:storage_blocks/diamond 0.55 0.85 1.5 3
forge:storage_blocks/electrum 0.53 0.82 1.47 2.2
forge:storage_blocks/emerald 0.55 0.85 1.5 2.5
forge:storage_blocks/enderium 0.53 0.88 1.6 3
forge:storage_blocks/gold 0.52 0.8 1.45 2
forge:storage_blocks/graphite 0.1 0.5 2 2
forge:storage_blocks/invar 0.5 0.79 1.43 0.6
forge:storage_blocks/iron 0.5 0.75 1.4 0.6
forge:storage_blocks/lead 0.75 0.75 1.75 1.5
forge:storage_blocks/lumium 0.75 0.55 1.5 1.8
forge:storage_blocks/nickel 0.5 0.82 1.46 0.6
forge:storage_blocks/osmium 0.51 0.77 1.41 1
forge:storage_blocks/platinum 0.53 0.86 1.58 2.5
forge:storage_blocks/signalum 0.63 0.66 1.5 1.8
forge:storage_blocks/silver 0.51 0.79 1.43 1.5
forge:storage_blocks/steel 0.5 0.78 1.42 0.6
forge:storage_blocks/tin 0.3 0.7 1.35 0.75
forge:storage_blocks/unobtainium 0.95 0.82 2 5
forge:storage_blocks/vibranium 0.15 0.75 8 4
forge:storage_blocks/zinc 0.51 0.77 1.41 1
biggerreactors:liquid_obsidian 0.3 0.7 1.35 0.75
allthemodium:molten_allthemodium 0.66 0.9 3.5 3.5
allthemodium:molten_vibranium 0.15 0.75 8 4
allthemodium:molten_unobtainium 0.95 0.82 2 5
allthemodium:vapor_allthemodium 0.66 0.9 3.5 3.5
allthemodium:vapor_vibranium 0.15 0.75 8 4
allthemodium:vapor_unobtainium 0.95 0.82 2 5
forge:superheated_sodium 0.23 0.6 1.7 1
forge:redstone 0.75 0.55 1.6 2.5
forge:ender 0.9 0.75 2.0 2

Bigger Reactors | CurseForge

Bigger Reactors - All The Guides (2024)


What is the biggest size of bigger reactors in Minecraft? ›

With the default config, reactors may be built as large as 128 × 128 × 192, however this may be changed to an absolute maximum of 192 × 192 × 256.

What is the basic setup for bigger reactors? ›

A basic Big Reactor is a small 3x3x3 multi-block structure. It requires at a minimum 22 Reactor casings, a Reactor Controller, an intake port to get fuel into it, an export port to get waste out, a fuel Control Rod, and a Reactor Power Tap which supplies power to whatever cable you attach to it.

What are the rules for big reactors? ›

All reactors need at least 1 fuel rod and 1 control rod. Fuel rods need to be arranged in a vertical column inside the reactor and capped with a control rod on the very top level. All reactors also need a reactor controller, 2 reactor fuel ports, and 1 or more reactor power taps.

What is the best setup for a reactor in Minecraft? ›

The most efficient setup for rods is a checkerboard pattern with three spaces between the outermost rod and the interior wall. Heat manifolds placed on the interior walls of the reactor also in a checkerboard pattern in the cardinal directions of any rods (north, South East, West).

Which is the tallest reactor? ›

The world's highest nuclear research reactor has been established in the South American country Bolivia. This research reactor is located at an altitude of 4000 meters above sea level. It has been established by 'Rosatom' company. 'Rosatom' is Russia's nuclear energy company.

How big is mekanism? ›

The reactor is a hollow cuboid of up to 18 x 18 x 18 blocks made of Fission Reactor Casing. The sides (not edges) of the structure can be replaced by Reactor Glass or Fission Reactor Ports.

Is extreme reactors the same as big reactors? ›

Big Reactors is a mod originally created by Erogenous Beef, and continued by ZeroNoRyouki and ABookFreak under the name Extreme Reactors. It is based around high-end multi-block power generators.

How do you make a blutonium big reactor? ›

Recipe. Blutonium Ingots are crafted in a Cyanite Reprocessor, which when powered, creates 1 Blutonium Ingot for every 2 Cyanite Ingots and 1000 mB of Water.

Are large reactors more efficient space engineers? ›

The large reactor is about 1.3 times more weight-efficient (MW/reactor-mass kg) on large ships. On a small ship, a large reactor produces about 1.6 times more power per kg of reactor mass than a small one. Both sizes of reactors on both grid sizes produce 1 MWh / kg of Uranium Ingots.

Is it illegal to build a reactor? ›

Twelve states currently have restrictions on the construction of new nuclear power facilities: California, Connecticut, Hawaii, Illinois, Maine, Massachusetts, Minnesota, New Jersey, New York, Oregon, Rhode Island and Vermont.

How long do reactors last? ›

Most nuclear power plants have operating life- times of between 20 and 40 years.

How big is a PWR reactor? ›

Specifications of Reactor Vessel
2 Loop4 Loop
Inner Diameter(m)3.44.4
Weight(ton)approx. 240approx. 410
3 more rows

How to get waste out of bigger reactors? ›

Reactor Access Port

Right-clicking a port brings up an interface that allows to add fuel, remove waste, and toggle inlet/outlet mode. An active reactor will use the fuel from the 'Inlet' port and dump waste into the 'Outlet' port.

How do you cool a big reactor in Minecraft? ›

Many different types of liquids will cool the inside of a reactor down. The best (as far as I know) is Gelid Cryotheum, but other good ones include Destabilized Redstone and Resonant Ender. Just fill the inside of your reactor with your liquid of choice and you're good to go!

What are the sizes of advanced reactors? ›

Small Modular Reactors Range: 20 MW to 300 MW Can be scaled up or down by adding more units. Full-Size Reactors Range: 300 MW to 1,000+MW Can provide reliable, emissions- free baseload power. MW refers to one million watts of electricity.

How big is a modular reactor? ›

Small modular reactors also can vary in size from a dozen megawatts to hundreds of megawatts per module. Modules can be added or taken offline to match electricity demand, giving the plants immense flexibility.

How to cool big reactors in Minecraft? ›

Many different types of liquids will cool the inside of a reactor down. The best (as far as I know) is Gelid Cryotheum, but other good ones include Destabilized Redstone and Resonant Ender. Just fill the inside of your reactor with your liquid of choice and you're good to go!

What is the typical reactor size in industry? ›

A typical batch reactor consists of a pressure vessel with an agitator and integral heating/cooling system. The vessels may vary in size from less than 1 L to more than 15,000 L. They are usually fabricated in steel, stainless steel, glass-lined steel, glass or exotic alloys.


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