Big Reactors | Pink Army

Big Reactors | Pink Army

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The Big Reactors mod adds multi-block power systems capable of providing large amounts of RF power to Minecraft. The specific arrangement and material of mod blocks in each multi-block structure determines the performance and behavior of the system as a whole.

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A power system can be built in one of two ways: a reactor can provide RF power directly, or a reactor can provide super-heated steam which is then pumped into a steam turbine to generate RF power. The latter option is much more expensive, but also much more efficient. The minimum size of a reactor is 3×3×3 blocks whereas the minimum size of a working turbine is 5×6×5. Systems with several multi-block structures of nearly infinite size can be built.

Big Reactors greatly benefits from the support of mods which provide transport and fluid pipes such as BuildCraft. It can also interface directly with ComputerCraft and RedNet.


Reactors and turbines are multi-block structures made up of individual blocks arranged according to specific rules, which together create a large functional machine. Both reactors and turbines must be built as a closed, mostly hollow box with no holes and complete edges, including corners. The edges of this box can be, but not necessarily built from Reactor Casing or Turbine Housing blocks, and the faces of Reactor Glass or Turbine Glass blocks, respectively.

In addition to these containment blocks, a number of other blocks are necessary to make a functioning reactor or turbine. None of these blocks can be placed on the edge or corner; they must be somewhere in the faces of the reactor, sometimes in very specific places. Right clicking on the reactor casing or turbine housing will display a message of what is missing.

Important: Ensure that there aren’t any metallic blocks within a 1 block radius of the turbine! Doing so results in unpredictable behavior with the turbine.

Download this spreadsheet to calculate the required materials and their cost for any size Reactor structure.

Use this Big Reactor Simulator to test the efficiency of different Reactor designs.



Reactor Temperature[edit]

The fuel inside the fuel rods generates power, radiation and heat. Heat is transferred to the adjacent 4 blocks from the fuel rods into a coolant or fuel rod block, and likewise radiation is transferred up to 4 blocks (dependant on adjacent block absorption) in the cardinal directions (North,South,East,West).

Excess radiation and heat could cause the temperature in the reactor to rise above efficient levels and consume more fuel, since there is a penalty to fuel consumption at too high an operating temperature.

Temperature (C) < 200 200 to 1000 1000 to 2000 Loss (%) None 0 to 10 10 to 66

Reactor Coolant[edit]

A coolant reduces the temperature of a reactor, and moves heat from the reactor core to the reactor casing. The higher the casing heat, the higher the energy output and heat transfer rate of coolants [1].

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Any fluid used as coolant must be manually added to the reactor during construction, exactly as you would with solid coolant materials. Those looking to fill large reactors with fluids that fall, such as Gelid Cryotheum, may want to consider using a Flood Gate of Fluid Outlet.

Each coolant material has various parameters that govern how it affects the reactor [2]:

  • Absorption: How much radiation this material absorbs to convert to heat. Ranges from 0 (none) to 1 (all).
  • Heat Efficiency: How efficiently absorbed radiation is converted to heat. Ranges from 0 (none) to 1 (all).
  • Moderation: How well this material moderates radiation. This is a divisor, and greater than or equal to 1.
  • Conductivity: Amount of heat transfered on each exposed face.

Block Absorption Heat Efficiency Moderation Conductivity Iron Iron 1-383-744-3087-1016 0.6 Gold Gold 1-383-744-3087-1016 2 Diamond Diamond 1-383-744-3087-1016 3 Emerald Emerald 1-383-744-3087-1016 2.5 Graphite Graphite 1-383-744-3087-1016 Glass Glass 1-383-744-3087-1016 0.3 Ice Ice 1-383-744-3087-1016 5 0.1[3] Snow Snow 1-383-744-3087-1016 5 0.05[3] Copper Copper 1-383-744-3087-1016 1 Osmium Osmium 1-383-744-3087-1016 1 1 Brass Brass 1-383-744-3087-1016 1 1 Bronze Bronze 1-383-744-3087-1016 1 1 Zinc Zinc 1-383-744-3087-1016 1 1 Aluminum Aluminum 1-383-744-3087-1016 0.6[3] Steel Steel 1-383-744-3087-1016 0.6 Invar Invar 1-383-744-3087-1016 0.6 Silver Silver 1-383-744-3087-1016 3 1.5 Lead Lead 1-383-744-3087-1016 5 1.5[3] Electrum Electrum 1-383-744-3087-1016 7 2.2 Fluxed Electrum Fluxed Electrum 1-383-744-3087-1016 8 2.4 Platinum Platinum 1-383-744-3087-1016 8 2.5 Shiny Shiny 1-383-744-3087-1016 8 2.5 Titanium Titanium 1-383-744-3087-1016 9 2.7 Enderium Enderium 1-383-744-3087-1016 3 Water Water 1-383-744-3087-1016 0.1 Destabilized Redstone Destabilized Redstone 1-383-744-3087-1016 2.5 Energized Glowstone Energized Glowstone 1-383-744-3087-1016 1 Gelid Cryotheum Gelid Cryotheum 1-383-744-3087-1016 3 Resonant Ender Resonant Ender 1-383-744-3087-1016 2 Blazing Pyrotheum Blazing Pyrotheum 1-383-744-3087-1016 0.6 Life Essence Life Essence 1-383-744-3087-1016 2


A Turbine produces energy from Steam generated by an active cooling Reactor or generated using one of 6 other mods methods. Steam is converted back into water, which may be recycled into a Reactor to produce more steam.

Rotor Material[edit]

For each rotor block in the turbine made of either a Turbine Rotor Shaft and a Turbine Rotor Blade, a mass of 10 is added [4].

Turbine Coil Material[edit]

The three values are always averaged together to give the resulting values for the entire turbine coil. A higher efficiency will always produce more power. A higher drag will produce more power, but will slow down the rotor more when induction is enabled. A higher bonus will also always produce more power.

Block Efficiency Drag Bonus Iron Iron 1-383-744-3087-1016 Copper Copper 1-383-744-3087-1016 Osmium Osmium 1-383-744-3087-1016 Brass Brass 1-383-744-3087-1016 Aluminum Aluminum 1-383-744-3087-1016 Steel Steel 1-383-744-3087-1016 Invar Invar 1-383-744-3087-1016 Silver Silver 1-383-744-3087-1016 Gold Gold 1-383-744-3087-1016 Electrum Electrum 1-383-744-3087-1016 Fluxed Electrum Fluxed Electrum 1-383-744-3087-1016 01 Platinum Platinum 1-383-744-3087-1016 Shiny Shiny 1-383-744-3087-1016 Titanium Titanium 1.023 0.27 1 Enderium Enderium 1-383-744-3087-1016 Ludicrite Ludicrite 1.155 1-383-744-3087-1016 Mithril Mithril [5] 1-383-744-3087-1016 Orichalcum Orichalcum [5] 1-383-744-3087-1016 Quicksilver Quicksilver [5] 1-383-744-3087-1016 Haderoth Haderoth [5] 1-383-744-3087-1016 Celenegil Celenegil [5] 1.089 0.225 1 Tartarite Tartarite [5] 1-383-744-3087-1016

Turbine Optimization[edit]

Optimized turbine designs for various coil materials

  • Turbines convert steam into water at an even ratio, and produce a certain amount of RF per tick depending on the coil material and turbine design.
  • Steam intake is always between 0 and 2,000 mB per tick.
  • The rotor speed gauge only shows between 0 and 2,200 RPM, but the actual rotor speed can be higher.
  • Generated energy is always positive or 0.
  • The width of the turbine frame is not a factor of energy output.
  • The number of rotor shafts isn’t a very large factor of energy output. Dimensions used are at the Player’s discretion.
  • If maximum rotor speed is unlimited and 2,000 mB per tick of steam is available, it is most efficient to use 80 rotor blades. If the rotor speed is limited to 2,000 RPM, perhaps more rotor shafts and fewer rotor blades would be preferable in order to keep the rotor speed above 1,796.27 but below 2,000 RPM while optimizing energy output.
  • All blocks of the coil do not need to be made of the same material, but are averaged together to determine the turbine’s score in each of the three coil traits. This makes it possible to make composite coils that use cheap filler metals in balance with high end metals to maximize limited resources. It also means, however, that adding a ring of a low performing metal to a turbine with several rings of a high-perfomance metal may actually reduce the output.

Turbine Equation[edit]

  • BladeSurfaceArea = Number of rotor blades in the turbine.
  • RotorMass = Total combined mass of the rotor blades and rotor shafts. See the table above for the mass of each block.
  • CoilSize = The number of coil blocks in the turbine.
  • InductorEfficiency, InductorDrag, InductorBonus = The average Efficiency, Drag, and Bonus of each coil block (from the table above).
  • RotorSpeed = The speed of the rotor as displayed in the turbine controller GUI.

color {White}{text{GeneratedEnergy}}={text{InductorEfficiency}}*{text{TurbineEfficiency}}*({text{CoilSize}}*{text{InductorDrag}}*{text{RotorSpeed}})^{{{text{InductorBonus}}}}

color {White}{text{TurbineEfficiency}}={begin{cases}0.25left(cos left({frac {{text{RotorSpeed}}}{45.5pi }}right)+3right)&{text{RotorSpeed}}geq 500\0.5&{text{RotorSpeed}}<500\end{cases}}

The turbine is at maximum efficiency (100%) at 898.134 RPM and 1796.27 RPM. It has an efficiency of 50% when less than 500 RPM, and at 1347.2 RPM. This doesn’t mean, however, that a turbine is most energy efficient at 1796 RPM.

color {White}{text{RotorSpeed}}={frac {{text{RotorEnergy}}}{{text{BladeSurfaceArea}}*{text{RotorMass}}}}

Rotor energy in terms of ticks elapsed:

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color {White}{text{RotorEnergy}}={frac {b*left(a^{{{text{ticks}}}}-1right)}{a-1}}+Ca^{{{text{ticks}}}}

Where C is a constant that must be calculated based on initial values. If the turbine is just being started, then C is zero. OR, in terms of the RotorEnergy of the previous tick:

color {White}{text{RotorEnergy}}_{n}={text{RotorEnergy}}_{{n-1}}*a+b

Rotor energy when turbine is running continuously:

color {White}{text{RotorEnergy}}={frac {b}{1-a}}

a and b are both constant and are only dependent on the design of the turbine and the control values in the turbine controller.

color {White}a=1-{text{InductionTorque}}-{frac {1}{4000*{text{RotorMass}}}}

color {White}b={text{LiftTorque}}-{frac {{text{RotorMass}}}{10}}

color {White}{text{InductionTorque}}={frac {{text{CoilSize}}*{text{InductorDrag}}}{{text{BladeSurfaceArea}}*{text{RotorMass}}}}

If the turbine inductor is disengaged then InductionTorque equals zero.

color {White}{text{LiftTorque}}={frac {{text{BladeSurfaceArea}}*(10*{text{SteamIn}}-{text{UseableSteamEnergy}})}{leftlfloor {frac {{text{SteamIn}}}{25}}rightrfloor }}+{text{UseableSteamEnergy}}

color {White}{text{UseableSteamEnergy}}=10*min(25*{text{BladeSurfaceArea}},{text{SteamIn}})



  • On Valentine’s Day, turbines spawn hearts instead of steam cloud particles, and reactors spawn hearts instead of heat packet particles. This has no effect on game mechanics and is purely a graphical change.
  • Reactors from Big Reactors mod are similar to real world RBMK-1000 breeder reactors, one of which was the Chernobyl reactor.


v · d · e Big Reactors Machines Resources

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