BR Reactor controller script.

reactor.lua

local component = require("component")
local r = component.br_reactor

local capacity = r.getEnergyCapacity();

while true do
  s = r.getEnergyStored();
  
  if r.getActive() then
    if s/capacity > 0.8 then
      r.setActive(false)
    end
  else
    if s/capacity < 0.2 then
      r.setActive(true)
    end
  end
  os.sleep(1)
end