This is stated on the page of the state corporation on Twitter.

“Loading of nuclear fuel has begun at power unit No. 1 of the Belarusian NPP,” the message says.

Loading of nuclear fuel has begun at power unit No. 1 of the Belarusian NPP pic.twitter.com/pLB7rmbqZd

- Rosatom (@rosatom) August 7, 2020

Earlier it was reported that Russia and Belarus are discussing adjusting the terms of the Russian loan for the construction of the Belarusian nuclear power plant.