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.
The renovation will last until July 15th.
The first experimental batch of fuel assemblies (up to 12 pieces) manufactured by Westinghouse is planned to be loaded into the core of Rivne NPP unit 2 in 2024.
The work was carried out with the participation of specialists from Holtec International and separate divisions of Energoatom.
Search and elimination of the causes of this incident is carried out.
Earlier, the South-Ukrainian and Zaporizhzhia NPPs undergone the scheduled inspection carried out by the IAEA inspectors.
Currently, 12 of the 15 Ukrainian power units are in operation, with a total current capacity of 11,315 MW.