A reactor at Romania 's state-run energy producer Nuclearelectrica shut down unexpectedly earlier Wednesday, company officials told Mediafax.

"Unit 2 has been shut down, for causes yet unknown," Nuclearelectrica General Manager Dumitru Dina told reporters. He said the problem wasn't serious.

Nuclearelectrica operates two 700-megawatt reactors at its nuclear power plant in Cernavoda, covering around 20% of Romania 's energy consumption.

The latest unscheduled shutdown in Cernavoda took place in November last year, when the Unit 2 stopped automatically due to a computer malfunction.

Nucleareletrica is majority owned by the state, through the Economy Ministry.

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