As of early September 2022, 32 of France's 56 nuclear reactors were shut down due to maintenance or technical problems.
Yes, there was a big program to catch up on deferred maintenance post-covid. The majority have completed this.
France has been running this nuclear system since the 1970s, note. It was fully built out over 20 years ago. They have a very long track record.
“To date, 11 of the 16 reactors most sensitive to stress corrosion have been repaired, and four more are expected to be fixed by the end of the year.”