Russian military forces have taken control over the Zaporizhia nuclear power plant (NPP) the State Inspectorate for Nuclear Regulation of Ukraine (SNRI) has said.

"Operating staff monitors the state of power units and ensures their operation in accordance with the requirements of technological regulations for safe operation," the Inspectorate said on its website on Friday.

SNRI said that on Friday night, Russian soldiers fired shots at the NPP, as a result of which a fire broke out on its territory. The fire was extinguished as of 6:20 a.m. by Ukraine's State Emergency Service.

"The NPP power units maintain their integrity, there are damages to the arrangement of the reactor compartment of power unit No. 1… Systems and elements important for the safety of the NPP are in working order," the Inspectorate said, adding that there have been no changes in radiation levels.

Specialists from the Inspectorate are in touch with the NPP's engineers.

SNRI said only one of the six power units, No. 4, is currently in operation at the station, which is currently producing 690 MW of electric power.

Power unit No. 1 is undergoing scheduled preventive maintenance, while power units No. 2, 3, 5 and 6 are used for cooling nuclear installations. Units No. 2 and 3 are disconnected from the power system.

The Zaporizhia NPP is the largest nuclear power plant in Europe in terms of installed capacity. Its six power units VVER-1000 with a capacity of 1000 MW each were built according to the V-320 project. The first power unit was put into operation in December 1984, the sixth - in October 1995.