Kursk Nuclear Power Plant's first turbine generator, located about 500km south of Moscow, has been shutdown due to an emergency protection system alarm.
According to preliminary reports, the system reacted to a short-circuit in the stator.
The first power-generating unit of the plant is currently running at half throttle as the turbine generator has been switched off, reported RT.
The radiation environment around the facility, which feeds the grid for central Kursk and 19 other regions is normal, after the protection system malfunction.
Kursk NPP representative Aleksey Suzdalev was quoted by RIA Novosti as saying, "The unit is operating. One of the electric sensors went off, so did the protection system."
"The turbine generator has been currently working at 50 percent of its capacity. There have been no radioactive risks whatsoever safety-wise. Normal functioning of the automatic system," Suzdalev added.
Located 40km west of Kursk, on the bank of the Seim River near the satellite city Kurchatov, Kursk NPP is one of Russia’s three biggest nuclear power plants and four biggest electricity producers.
The NPP is a one-circuit plant, where the steam supplied to the turbines is produced inside the reactor by the boiling coolant, and for condensing the steam the plant uses water from a 21.5m2 cooling pond.