Big Reactor Fuel Controller 1.10.2

local component = require("component")

local rc = component.br_reactor

local FAM = rc.getFuelAmount()

local function nv()
        local FM = rc.getFuelAmount()
        ptt = (FM * 100) / FAM
    end

while true do
    nv()

    if ptt < 50 then
        rc.setActive(false)
    elseif ptt >= 51 then
        rc.setActive(true)
        os.sleep(1)
     end
 end