Pressurizer and four steam generators for OL3 arrived on site

The steam generators and the pressurizer for OL3 were manufactured at AREVA's Chalon plant in France. The fabrication started in 2004 and has been carried out under constant supervision of a representative of TVO. Finnish Radiation and Nuclear Safety Authority (STUK) has also conducted inspections at the manufacturing plant during the fabrication process. The vessel carrying the components left France on 8 November and arrived in the Port of Rauma on 18 November.

The pressurizer was transported to OL3 by road on Thursday 19 November. The operation took about two hours. The pressurizer weighs 150 tons and is used to control pressure in the reactor circuit.

The steam generators were brought to the construction site by sea in two operations with the first two steam generators shipped on Sunday 22 November and the remaining two on Tuesday 24 November. The steam generators are heat exchangers, which transfer the heat generated by the reactor from the reactor coolant system to the turbine circuit. The steam, which has a temperature of almost 300oC, is transferred from the steam generators to a high-pressure turbine and then through reheaters to low-pressure turbines. A generator connected to the turbine shaft and rotated by the turbines generates electricity. Each steam generator weighs more than 500 tons, which makes them the largest components of the entire plant unit.

The installation of the main components in the reactor island starts in 2010. The pressure vessel delivered to OL3 in January 2009 is installed first, followed by the steam generators and the pressurizer according to the planned installation sequence.


For more information, please contact:
Mr. Jouni Silvennoinen, Director, OL3 Project, tel. +358 (0) 2 8381 4100
Ms. Käthe Sarparanta, Communication Manager, OL3 Project, tel. +358 (0) 2 8381 4210.