NRC is also evaluating bids from international firms for the estimated $70 million lump-sum turnkey (LSTK) contract to rehabilitate the second lube processing unit at the refinery. The scope of works calls for the restoration of the second lube oil plant train to its full design capacity of about 50,000 barrels a day (b/d). Originally commissioned in 1987, Baiji is the only refinery in Iraq which processes heavy oil. The 350,000-b/d complex closed down for 10 days at the end of December after an increase in the number of insurgent attacks in the area.