Energoatom says 14 power units will operate during the autumn-winter period.
There was a flash of hydrogen without further combustion.
The team of independent experts was represented by 19 specialists from Bulgaria, Great Britain, Armenia, Slovakia, the USA and other countries.
The power unit is planned to be put under maintenance.
6 out of 15 domestic nuclear reactors are currently operating on Westinghouse fuel.
Repairs to eliminate equipment defects completed.