Russia’s Kalinin units resume operation

Units 1 and 2 shut down, while unit 4 was offline at reduced thermal power output. Kalinin unit 3 was unaffected and continued operating as usual. The plant is north-west of Moscow, in the Tver region.

"The fault was caused by a short circuit in the open switchgear of one of the transformers serving the plant, which led to the disconnection of two 750 kV power lines - Belozerskay and Experimental," Rosenergoatom said, adding that the fault was entirely unrelated to the plant's main equipment.

"Unit 2 reached the rated capacity of 1000 MW on 20 July and thus, at present, the operation of all three power units - disconnected from the network due to a short circuit that occurred on 18 July on the busbar of one of the station’s current transformers - has been restored," it said. On the same day unit 4 was connected to the network, following unit 1 on 19 July, it added.

The background radiation level at the plant and surrounding area remains unchanged, corresponds to the normal operation of the power units, and does not exceed the natural background value of 8-12 microsievert per hour, it said.