In addition to normal annual maintenance works the super heaters in the recovery boiler will be replaced. During the maintenance period, between 800 and 1,000 additional workers will be working onsite. This is the most extensive maintenance since the start of the mill in November 2007.The maintenance shutdown was scheduled in mutual understanding between UPM and the Uruguayan environmental authority Dinama.UPM's Fray Bentos pulp mill is located on the bank of the River Uruguay four kilometers east of the city of Fray Bentos. The mill, with an annual capacity of approcximately 1.1 million tons of bleached eucalyptus pulp, was built by Metsä Botnia but later on taken over by UPM.