© REUTERS/Lefteris KaragiannopoulosA general view of the unfinished Olkiluoto-3 nuclear reactor in Eurajoki, Finland August 17, 2017.
The damage to Europe's largest nuclear reactor is a setback for Finland, where the national grid operator has warned of potential power blackouts in the coming winter if OL3 could not reliably supply electricity.
Imports of power to Finland from Russia stopped in May after Russian utility Inter RAO said it had not been paid for the power it sold, increasing Finland's need for OL3's output.
Under construction since 2005, OL3 was originally meant to start operation in 2009, but has faced several technical mishaps, which sparked costly delays and a lengthy legal battle.
TVO said the latest problem had occurred in pumps located in the so-called turbine island at the heart of the nuclear reactor's power production, where water from its feedwater tank is pumped into steam generators.
While the damage would "most likely" impact the reactor's scheduled startup, it was not yet clear how long any delay would be, TVO said.
Test production at OL3 began this year, and regular electricity output at the reactor had been set to start on Dec. 14, TVO has said.
"The damage detected at the pumps has no impact on nuclear safety," the company said on its website.
Comment: France is also facing extended delays in bringing 28 of its reactors back online, which also appears to be due to damage, which in this instance was detected during scheduled maintenance.
Whilst these incidents could simply reflect the rapidly deteriorating state of Europe, the inevitable result of being led by the incompetent and corrupt, the timing is also rather notable: Explosion and huge fire at gas plant in Wichita, US