Ukrainian Prime Minister Arseniy Yatsenyuk announced Wednesday that an accident had occurred at the Zaporizhye nuclear power plant (NPP) in the country’s southeast. Yatsenyuk also said that he had asked Volodymyr Demchyshyn, Ukraine’s energy minister, to hold a news conference.

“I know that an accident has occurred at the Zaporizhye NPP,” Yatseniuk said, according to Reuters.

According to Interfax Ukraine, a local news agency, the accident occurred at bloc No 3, a 1,000-megawatt reactor, aggravating the power crisis in the country. The reactor is expected to be fixed by Dec. 5, Interfax reported. The unit was shut down on Nov. 28, the report added.

Energy minister Demchyshyn reportedly said that the accident had caused insignificant damage to the reactor, Reuters reported. Zaporizhye plant is Ukraine's largest nuclear power plant, and the fifth-largest in the world.