Bulgarian nuclear power plant Kozloduy has shut down one of its two 1,000 megawatt units after a protection system was activated at the unit’s generator, it said in a statement on its website.

The shutdown was triggered because of an anomaly in conventional power generation equipment and not a fault in the plant’s nuclear reactor. There is no danger of any radioactive contamination, the head of the Nuclear Regulatory Agency, Lachezar Kostov, told Reuters.

Also, Bulatom experts quoted by Novinite say that there are serious differences between the reactors at the Chernobyl plant where there was a huge explosion, and those in Kozloduy. They are convinced that the reactors at Kozloduy, a type of WWER, are better protected than those at the Chernobyl plant.

Reactors of the Chernobyl nuclear power plant were RBMK, while the Kozloduy NPP units are WWER, and many WWER reactors have been put into operation in the world in the last few years, experts from Bulatom said.

RBMK reactors have weaknesses in the fire system, whereas these types of WWER have a much more modernized system.