Automatic reactor is a contraption you can make which basically regulates the reactor on it's own so you can place it in your base or ship and don't have to worry about babysitting it.
Depending on how cautious you want to be, you might want to place the reactor far away from your base, or really close to you in your ship, because if something goes wrong, you can always delete the reactor to avoid meltdown.
Temperature
Place your temperature sensor on top of a polysilicon, make sure both objects connect to the reactor. Make two.
Similarly to a manual reactor, one polysilicon set to mode 0 will increase heat and another one set to mode 1 will decrease heat.
For your mode 0 temperature sensor, you should set the ratio to 20:1000 so the reactor can heat up on it's own.
For your mode 1 temperature sensor, you should set the ratio to 1001:10000 to prevent meltdown
Additionally, put a mode 2 polysilicon along with a button so you can manually eject fuel from the reactor.
You can also set custom ratio on temperature sensors.
Refuelling
local reactor = GetPartFromPort(1, "Reactor")
local dispenser = GetPartFromPort(2, "Dispenser")
while wait() do
local fuel = reactor:GetFuel()
for i = 1, #fuel do
if fuel[i] <= 0 then
dispenser:Trigger()
wait(1)
dispenser:Trigger()
end
end
end
You just have to put a microcontroller with ports connecting to one dispenser and the reactor. Adjust dispenser's port id to 2. Put the code in micro and it should work
Finishing off
All you need to do now is place a bin on the back of the reactor so it collects nuclear waste, an uranium bin for the dispensers, and a pipe connecting to water and steam containers