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Europe’s largest nuclear reactor, Olkiluoto 3, experienced an unexpected shutdown on Wednesday during a test, according to its operator, Teollisuuden Voima Oyj (TVO). The incident marks the second disruption in recent days, raising concerns about the reliability of the next-generation European pressurized water reactor (EPR).
Johanna Aho, the head of communication at TVO, explained that the reactor was undergoing a fault ride-through test, during which a short circuit is intentionally created near the power plant. The test, designed to assess the plant’s ability to handle disruptions, led to an unforeseen interruption in production at 1:35 pm (1135 GMT). Aho stated, “During the test, the plant was supposed to produce electricity normally.”
TVO is currently investigating the cause of the shutdown in more detail, emphasizing the need to understand the factors that led to the unexpected halt in production.
This recent incident comes just a week after Olkiluoto 3 resumed production following a shutdown caused by a malfunctioning temperature measurement in the generator’s cooling system. The reactor, constructed by the French-led Areva-Siemens consortium, is a next-generation EPR and plays a crucial role in supplying more than 10 percent of Finland’s electricity.
Olkiluoto 3, situated on Finland’s southwest coast, has faced challenges throughout its construction phase, including repeated delays and significant cost overruns. The reactor is known for its troubled history, shared by several other EPR projects globally.
The unexpected shutdown raises questions about the reliability and safety of Olkiluoto 3, and the incident will likely prompt a thorough review of the reactor’s operational protocols. As investigations unfold, stakeholders and experts will closely monitor developments to ensure the resolution of the issue and the restoration of normal operations.