As reported in the inspection itself, during the scheduled comprehensive tests of the second channel of the security system, the diesel generator was switched off as a result of the over-speed protection operation. Disconnection occurred in 08: 26. After eliminating the causes and ending the tests, the second channel of the security system was restarted. Before October 18, the fourth power unit was also shut down due to the emergency protection of the reactor and after two days of repair was put into operation. In April, a failure occurred in the sixth power unit of the nuclear power plant.
The NIYAR stated that there was no violation of the limits and conditions for the safe operation of power unit No. 4 of Zaporizhzhya NPP. The radiation situation at the Zaporizhzhya NPP site and beyond remains unchanged. An incident investigation commission has been established. The term of operation of the fourth power unit of the Zaporizhzhya NPP has been extended by the commission to 4 on April 2028 of the year.
Earlier, the State Nuclear Regulatory Inspectorate of Ukraine stated a significant increase in the number of disruptions in the operation of nuclear power plants. For 2017, the 17 violations in the operation of Ukraine’s nuclear power plants were recorded, which was the highest figure in seven years.