test.lua

local reactor

function reactorSearch()
 local names = peripheral.getNames()
 local i, name
 for i, name in pairs(names) do
  if peripheral.getType(name) == "fissionReactorLogicAdapter" then
   return peripheral.wrap(name)
  end
 end
end

reactor = reactorSearch()

if reactor ~= nil then
    local currentWastePercentage = math.floor(reactor.getWasteFilledPercentage() * 100)
    print(currentWastePercentage)
    local coolantFilled = reactor.getCoolantFilledPercentage()
    print(coolantFilled .. '-',coolantFilled >= minPercentageToStart)
    local fuelFilled = reactor.getFuelFilledPercentage()
    print(fuelFilled .. '-', fuelFilled >= minPercentageToStart)
    local currentTemp = math.floor(reactor.getTemperature())
    print(currentTemp .. '-', currentTemp < 800)
    local minPercentageToStart = 20
    print(minPercentageToStart)


    local canOperate = coolantFilled >= minPercentageToStart and fuelFilled >= minPercentageToStart and currentWastePercentage <= 90 and currentTemp < 800

    print(canOperate)


end

local alarmPos = "back"

redstone.setOutput(alarmPos, true)
redstone.setOutput(alarmPos, false)