Neo IndustrialFluid reactor
A 
Nuclear Reactor enclosed in a pressure vessel no longer gives EU: it heats coolant, and that heat is used to make steam or drive a Stirling generator.
How to build it
- Build the reactor with its chambers as usual.
- Surround it with a hollow 5 × 5 × 5 cube with the reactor in the center: all 98 edge blocks must be
Reactor Pressure Vessel, 
Reactor Access Hatch, 
Reactor Fluid Port or 
Reactor Redstone Port. The inside (chambers or air) is free. - The GUI shows hU/t instead of EU/t and two 10,000 mB tanks on the sides: coolant and hot coolant.
| Block | What it is for |
|---|---|
| Reactor Pressure Vessel | the wall |
| Reactor Access Hatch | right-click opens the reactor's GUI; hoppers reach its grid through it |
| Reactor Fluid Port | coolant goes in and hot coolant comes out (pipes); with a  Fluid Ejector Upgrade it pushes the hot coolant, up to 1,000 mB per tick |
| Reactor Redstone Port | the redstone signal that turns it on (the reactor's or the chambers' no longer counts) |
How it works
- The heat the vents dissipate is doubled and heats coolant: 1 mB of hot coolant per 20 hU.
- Without coolant, or with the hot tank full, that heat goes back to the hull: the reactor heats up like one with no vents.
- Hot coolant goes to a
Liquid Heat Exchanger: it cools it (20 hU per mB) and gives the heat to a 
Steam Boiler or a 
Stirling Generator. The cold coolant goes back to the reactor. - From 85% heat, vessel blocks melt: the shell opens and the reactor stops being a fluid reactor (and without the port's signal, it shuts down).
Coolant
- Made in the
Fluid/Solid Canning Machine, Enrich mode: 1,000 mB of water + 8 lapis dust = 1,000 mB. - Carried in pipes, tanks, cells or buckets (
Coolant Bucket and 
Hot Coolant Bucket). - Placed in the world, hot coolant burns like lava whoever steps in.
More detail in the Nuclear reactor guide.