The country’s nuclear power operator confirmed that it continues to suffer hacking attacks on non-critical operations, but at the same time assured that the nuclear power plants are operating safely.

According to the president and CEO of Korea Hydro&Nuclear Power (KHNP), the company had been enhancing its online security, though he provided no further comments or details of the continued attacks. The company didn’t release any official statement regarding the issue.

The company’s president claimed during a news briefing that they wouldn’t allow hacking attacks to stop nuclear power operation. He also promised that an internal network used for reactor operations could not be accessed from external communication lines and was therefore impervious to cyber attacks. The company announced it would continue operating the country’s nuclear plants safely despite any attempted hack.

Korea Hydro&Nuclear Power is part of state-run utility Korea Electric Power. The company first revealed a few days ago that its computer systems had been hacked. At the same time, the security experts explained that only non-critical information had been leaked, while reactor operations remained safe. The company’s management apologized for concerns that had been raised by the hacking attack and data leaks.

At the moment, South Korea has 23 nuclear reactors that supply 1/3 of the electricity for the country. 3 of them are now offline for routine maintenance or due to expired license. Since the first hack, both the company and the government have had emergency teams on standby as a precaution. It is also known that the attackers demanded the shutdown of 3 reactors and threatened “destruction” otherwise.