100 cubic metres of \”radioactive coolant\” leaked from Finland’s Olkiluoto 3 nuclear reactor. Operator TVO said the incident posed no safety risk. The leak was deemed to have been the result of \”a human error,\” as a hatch to the pool had not been closed properly. The next-generation European pressurised water reactor (EPR), built by the French-led Areva-Siemens consortium, produces more than 10 percent of Finland’s electricity.Like several other EPR projects, the reactor, located on Finland’s southwest coast, was plagued by repeated construction delays and billions of dollars in cost overruns. It is the single largest nuclear reactor in Europe, while Ukraine’s Zaporizhzhia plant, with its six reactors, is the largest nuclear plant in the world. The annual outage is scheduled to last until May and will not affect the planned duration of the annual outage, which is scheduled for two months. The reactor, built by Areva and Siemens, is one of the world’s largest nuclear plants.