© Photo : Ralf1969Запорожская nuclear power plants. Archive photo© Photo : Ralf1969
The fourth power unit of Zaporizhzhya NPP was shut off due to protection from Overspeed, said Wednesday the State Inspectorate for nuclear regulation (of giyar) of Ukraine.
This unit has already been stopped on October 18 after start attempts due to actuation of reactor protection. Two days later, it hooked up to the grid after large-scale average repair.
«The twenty-third of October 2018 unit No. 4 of Zaporizhia NPP was in power. In 8.26 (same as GMT) during a scheduled comprehensive testing of the second channel security system (de-energizing their own needs from the key management reserve control Board) has been shut down diesel generator (DG-2) due to the action of protection against Overspeed,» — said of giyar on the page in Facebook.
It is noted that after the elimination of the causes of tripping and the completion of integrated tests of the second channel security system «put in duty» created a Commission to investigate the incident. «Violation of limits and conditions of safe operation of power unit No. 4 of Zaporizhia NPP was not. The radiation situation at the site of Zaporizhzhya NPP and beyond its borders remains unchanged,» — said the Agency.
State nuclear regulatory Inspectorate (of giyar) Ukraine October 11, extended for ten years until April 4, 2028, the term of operation of the fourth reactor of the Zaporizhzhya NPP.
Zaporizhzhya NPP — the largest energy facility in Ukraine and Europe with an installed capacity of 6 thousand megawatts. The first unit was commissioned in 1984, second in 1985, third in 1986, fourth in 1987 and fifth in 1989 and the sixth in 1995. Since 1984 the contribution of Zaporizhzhya NPP in the energy sector of the country increased from 2% to 22%.