Yes and no. The 10 years maintenance was foreseeable, but during that they discovered a stress corrosion issue, initially on the (somewhat beleaguered) N4 plants but which turned out to be a lot more widespread than that.

It’s also chicken-decisions coming home to roost: maintenance delays due to covid, poor maintenance conditions leading to strikes, and training of new maintenance staff had apparently been slashed because an expected shift to renewables means you apparently don’t need to train staff to maintain 50+ nuclear plants expected to run for decades more.