The refueling and maintenance outages carried out at the plant units on alternating years are designed to ensure that a good level of operability and production is maintained at the Olkiluoto nuclear power plant at all times.
During the 2017 and 2018 annual outages of the OL1 and OL2 plant units, major plant modifications were carried out in preparation for the continuation of the plant units’ operating license in 2018. The modifications further improved the plant units’ capability of coping with events caused by exceptional natural phenomena.
The 2018 annual outages of the Olkiluoto nuclear power plant were started on April 22 with a refueling outage at OL2. In addition to refueling, the OL2 outage also included annually recurring maintenance work as well as completion of the installation of a new alternative coolant injection system. The outage lasted more than 13 days.
At OL1, the annual outage commenced on May 13 and was completed on June 23. The most important work of the outage at the plant unit included replacement of the reactor’s main internal pumps and their frequency converters, renewal of turbine condensers, installation of a new alternative coolant injection system, high-pressure drain forward pumping, and replacement of the high-pressure preheaters and feedwater distributors. A containment leak-tightness test was also carried out.
