The phone call was received on December 5, and no suspicious items or persons have been discovered at the station following a thorough check, Yevgeny Katunin said in a statement.
Since then, the site has been on high alert and the security regime and patrolling of the territory have been increased. The effort involves Ukraine’s Interior Ministry and Security Service.
In April 1986, Ukraine witnessed the world's worst nuclear disaster when an explosion at the Chernobyl nuclear power plant released radiation, which spread over the western part of the Soviet Union and Europe.
Nuclear power occupies one of the most prominent places in the Ukrainian economy. Over recent years, having only 22.8% of the installed capacity, nuclear power plants during autumn and winter maximum loads generated about 53% of the country's electricity. Currently there are 15 operating power units at four Ukrainian NPPs. Ukraine imports about $600 million worth of nuclear fuel from Russia on the average annually, which is comparable with the indicators reported in first half of 2014 (279 million tons).