The drill was conducted at the country's four nuclear plant complexes, said Korea Hydro and Nuclear Power Co (KHNP), which operates 23 nuclear reactors and supplies about 30 percent of the country's electricity needs.
"The two-day drill is under way through simulators to ensure the safety of our nuclear power plants under cyber attacks," said KHNP spokesman Kim Tae-Seok.
Last week a suspected hacker, using an account entitled "president of the anti-nuclear reactor group", published a variety of information on a Twitter account.
It included designs and manuals for two reactors as well as personal information on some 10,000 KHNP workers.
In a new message yesterday, the hacker threatened to release more information unless the government shuts down three reactors from December 25. The message warned residents in areas near the plants to stay away for the next few months.
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