The July 2020 intake clog derated a third unit to about 78 percent power; engineers put TVA's revenue loss at $15 million to $20 million.
The repair strengthens the connection between the ZNPP and the Ferosplavna-1 330 kV line, its sole remaining external power line.
Regulator's go-ahead came three days earlier; power start-up is scheduled for November 20, per Rosatom's Strana Rosatom.
Pressure in the primary circuit reached 24.5 MPa, about one-and-a-half times the reactor's normal operating pressure, with water at 135°C.
Limited access to the affected buildings was granted more than 48 hours after the reported October 5 attack.
Units 7 and 8 are scheduled to enter commercial operation in 2026 and 2027 under 2018 agreements with Russia.
Eleven units in Illinois, Pennsylvania and New Jersey take the uprates; Constellation puts the first at 2028 and the investment above $4.3 billion.
ANS Nuclear Newswire
International Atomic Energy Agency
